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55 55

Low Noise Double-Sided Silicon Strip Detector for Multiple-Compton Gamma-ray Telescope

Sep 18, 2013 09/13

by H. Tajima; T. Kamae; S. Uno; T. Nakamoto; Y. Fukazawa; T. Mitani; T. Takahashi; K. Nakazawa; Y. Oakada; M. Nomachi

eye 55

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A Semiconductor Multiple-Compton Telescope (SMCT) is being developed to explore the gamma-ray universe in an energy band 0.1--20 MeV, which is not well covered by the present or near-future gamma-ray telescopes. The key feature of the SMCT is the high energy resolution that is crucial for high angular resolution and high background rejection capability. We have developed prototype modules for a low noise Double-sided Silicon Strip Detector (DSSD) system which is an essential element of the...
Source: http://arxiv.org/abs/astro-ph/0212053v1

Arxiv.org

68 68

$Differential cross section and analyzing power of the ${\vec p}p{\to}ppπ^0$ reaction at a beam energy of 390 MeV$

Differential cross section and analyzing power of the ${\vec p}p{\to}ppπ^0$ reaction at a beam energy of 390 MeV

Sep 20, 2013 09/13

by Y. Maeda; M. Segawa; T. Ishida; A. Kacharava; M. Nomachi; Y. Shimbara; Y. Sugaya; K. Tamura; T. Yagita; K. Yasuda; H. P. Yoshida; C. Wilkin

eye 68

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The differential cross section and analyzing power $A_y$ of the ${\vec p}p{\to}pp{\pi}^0$ reaction have been measured at RCNP in coplanar geometry at a beam energy of 390 MeV and the dependence on both the pion emission angle and the relative momentum of the final protons have been extracted. The angular variation of Ay for the large values of the relative momentum studied here shows that this is primarily an effect of the interference of pion s- and p-waves and this interference can also...
Source: http://arxiv.org/abs/0802.2331v1

Arxiv.org

55 55

WIMPs search by exclusive measurements with thin multilayer NaI(Tl) scintillators (PICO-LON)

Sep 18, 2013 09/13

by K. Fushimi; H. Kawasuso; K. Yasuda; Y. Kameda; N. Koori; S. Nakayama; K. Ichihara; M. Nomachi; S. Umehara; R. Hazama; S. Yoshida; H. Ejiri; K. Imagawa; H. Ito

eye 55

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The WIMPs search project PICO-LON has been started with multilayer thin NaI(Tl) crystals. The thin (0.05cm) and wide area (5cmx5cm) NaI(Tl) crystals was successfully developed. The performances of thin NaI(Tl) scintillator was measured and they showed good energy resolution (20% at 60keV) and good position resolution (20% in 5cmx5cm wider area).
Source: http://arxiv.org/abs/astro-ph/0611700v3

Arxiv.org

89 89

Performance of a Low Noise Front-end ASIC for Si/CdTe Detectors in Compton Gamma-ray Telescope

Sep 20, 2013 09/13

by H. Tajima; T. Nakamoto; T. Tanaka; S. Uno; T. Mitani; E. do Couto e Silva; Y. Fukazawa; T. Kamae; G. Madejski; D. Marlow; K. Nakazawa; M. Nomachi; Y. Oakada; T. Takahashi

eye 89

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Compton telescopes based on semiconductor technologies are being developed to explore the gamma-ray universe in an energy band 0.1--20 MeV, which is not well covered by the present or near-future gamma-ray telescopes. The key feature of such Compton telescopes is the high energy resolution that is crucial for high angular resolution and high background rejection capability. The energy resolution around 1 keV is required to approach physical limit of the angular resolution due to Doppler...
Source: http://arxiv.org/abs/astro-ph/0404011v1

Arxiv.org

88 88

Design and Performance of the Soft Gamma-ray Detector for the NeXT mission

Jul 20, 2013 07/13

by H. Tajima; T. Kamae; G. Madejski; T. Mitani; K. Nakazawa; T. Tanaka; T. Takahashi; S. Watanabe; Y. Fukazawa; T. Ikagawa; J. Kataoka; M. Kokubun; K. Makishima; Y. Terada; M. Nomachi; M. Tashiro

eye 88

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The Soft Gamma-ray Detector (SGD) on board the NeXT (Japanese future high energy astrophysics mission) is a Compton telescope with narrow field of view (FOV), which utilizes Compton kinematics to enhance its background rejection capabilities. It is realized as a hybrid semiconductor gamma-ray detector which consists of silicon and CdTe (cadmium telluride) detectors. It can detect photons in a wide energy band (0.05-1 MeV) at a background level of 5 x 10^-7 counts/cm^2/s; the silicon layers are...
Source: http://arxiv.org/abs/astro-ph/0604365v1

Arxiv.org

66 66

Observation of $ρ/ ω$ Meson Modification in Nuclear Matter

Sep 22, 2013 09/13

by K. Ozawa; H. En'yo; H. Funahashi; M. Kitaguchi; M. Ishino; H. Kanda; S. Mihara; T. Miyashita; T. Murakami; R. Muto; M. Naruki; F. Sakuma; H. D. Sato; T. Tabaru; S. Yamada; S. Yokkaichi; Y. Yoshimura; J. Chiba; M. Ieiri; M. Nomachi; O. Sasaki; M. Sekimoto; K. H. Tanaka; H. Hamagaki

eye 66

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We have measured invariant mass spectra of electron-positron pairs in the target rapidity region of 12GeV p+A reactions. We have observed a significant difference in the mass spectra below the $\omega$ meson between p+C and p+Cu interactions. The difference is interpreted as a signature of the $\rho/\omega$ modification at normal nuclear-matter density.
Source: http://arxiv.org/abs/nucl-ex/0011013v2

Arxiv.org

14 14

On-site Background Measurements for the J-PARC E56 Experiment: A Search for Sterile Neutrino at J-PARC MLF

Jun 26, 2018 06/18

by S. Ajimura; T. J. C. Bezerra; E. Chauveau; T. Enomoto; H. Furuta; M. Harada; S. Hasegawa; T. Hiraiwa; Y. Igarashi; E. Iwai; T. Maruyama; S. Meigo; T. Nakano; M. Niiyama; K. Nishikawa; M. Nomachi; R. Ohta; H. Sakai; K. Sakai; S. Sakamoto; T. Shima; F. Suekane; S. Y. Suzuki; K. Suzuya; K. Tauchi

eye 14

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The J-PARC E56 experiment aims to search for sterile neutrinos at the J-PARC Materials and Life Science Experimental Facility (MLF). In order to examine the feasibility of the experiment, we measured the background rates of different detector candidate sites, which are located at the third floor of the MLF, using a detector consisting of plastic scintillators with a fiducial mass of 500 kg. The result of the measurements is described in this article. The gammas and neutrons induced by the beam...
Topics: Physics, High Energy Physics - Experiment, Instrumentation and Detectors
Source: http://arxiv.org/abs/1502.06324

Arxiv.org

18 18

Status Report for the 20th J-PARC PAC : A Search for Sterile Neutrino at J-PARC MLF (J-PARC E56, JSNS2)

Jun 28, 2018 06/18

by M. Harada; S. Hasegawa; Y. Kasugai; S. Meigo; K. Sakai; S. Sakamoto; K. Suzuya; E. Iwai; T. Maruyama; S. Monjushiro; K. Nishikawa; M. Taira; M. Niiyama; S. Ajimura; T. Hiraiwa; T. Nakano; M. Nomachi; T. Shima; T. J. C. Bezerra; E. Chauveau; H. Furuta; F. Suekane; I. Stancu; M. Yeh; H. Ray; G. T. Garvey; C. Mauger; W. C. Louis; G. B. Mills; R. Van de Water; J. Spitz

eye 18

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On April 2015, the J-PARC E56 (JSNS2: J-PARC Sterile Neutrino Search using neutrinos from J-PARC Spallation Neutron Source) experiment officially obtained stage-1 approval from J-PARC. We have since started to perform liquid scintillator R&D for improving energy resolution and fast neutron rejection. Also, we are studying Avalanche Photo-Diodes (SiPM) inside the liquid scintillator. In addition to the R&D work, a background measurement for the proton beam bunch timing using a small...
Topics: Instrumentation and Detectors, Physics, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1507.07076

Arxiv.org

6 6.0

Status Report for the 21th J-PARC PAC : Searching for a Sterile Neutrino at J-PARC MLF (J-PARC E56, JSNS2)

Jun 29, 2018 06/18

by M. Harada; S. Hasegawa; Y. Kasugai; S. Meigo; K. Sakai; S. Sakamoto; K. Suzuya; E. Iwai; T. Maruyama; S. Monjushiro; K. Nishikawa; M. Taira; M. Niiyama; S. Ajimura; T. Hiraiwa; T. Nakano; M. Nomachi; T. Shima; T. J. C. Bezerra; E. Chauveau; H. Furuta; F. Suekane; I. Stancu; M. Yeh; W. Toki; H. Ray; G. T. Garvey; C. Mauger; W. C. Louis; G. B. Mills; R. Van de Water; J. Spitz

eye 6

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The JSNS2 (J-PARC E56) experiment aims to search for sterile neutrinos at the J-PARC Materials and Life Sciences Experimental Facility (MLF).After the submission of a proposal to the J-PARC PAC, stage-1 approval was granted to the JSNS2 experiment. The approval followed a series of background measurements which were performed in 2014. Subsequent for stage-1 approval, the JSNS2 collaboration has made continuous efforts to write a Technical Design Report (TDR).This TDR will include two major...
Topics: High Energy Physics - Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1601.01046

Arxiv.org

16 16

Status Report (BKG measurement): A Search for Sterile Neutrino at J-PARC MLF

Jun 26, 2018 06/18

by M. Harada; S. Hasegawa; Y. Kasugai; S. Meigo; K. Sakai; S. Sakamoto; K. Suzuya; E. Iwai; T. Maruyama; H. Monjushiro; K. Nishikawa; R. Ohta; M. Taira; M. Niiyama; S. Ajimura; T. Hiraiwa; T. Nakano; M. Nomachi; T. Shima; T. J. C. Bezerra; E. Chauveau; T. Enomoto; H. Furuta; H. Sakai; F. Suekane; I. Stancu; M. Yeh; H. Ray; G. T. Garvey; C. Mauger; W. C. Louis; G. B. Mills; R. Van de Water; J. Spitz

eye 16

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At the 17th J-PARC PAC, which was held on September 2013, we proposed the sterile neutrino search at J-PARC MLF. After reviewing the proposal, PAC recommended to have a background measurement at the detector's candidate site location in their report to investigate whether the background rates can be manageable for the real experiment or not. Therefore, we have performed the background measurements (MLF; 2013BU1301 test experiment) during the summer of 2014, also following the 18th J-PARC PAC...
Topics: Physics, High Energy Physics - Experiment, Instrumentation and Detectors
Source: http://arxiv.org/abs/1502.02255

Arxiv.org

43 43

Letter of Intent for KASKA: High Accuracy Neutrino Oscillation Measurements with anti-nu_es from Kashiwazaki-Kariwa Nuclear Power Station

Sep 20, 2013 09/13

by M. Aoki; K. Akiyama; Y. Fukuda; A. Fukui; Y. Funaki; H. Furuta; T. Hara; T. Haruna; N. Ishihara; T. Iwabuchi; M. Katsumata; T. Kawasaki; M. Kuze; J. Maeda; T. Matsubara; T. Matsumoto; H. Minakata; H. Miyata; Y. Nagasaka; T. Nakagawa; N. Nakajima; H. Nakano; K. Nitta; M. Nomachi; K. Sakai; Y. Sakamoto; K. Sakuma; M. Sasaki; F. Suekane; H. Sugiyama; T. Sumiyoshi; H. Tabata; N. Tamura; M. Tanimoto; Y. Tsuchiya; R. Watanabe; O. Yasuda

eye 43

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One of the current most-demanded experiments in neutrino physics is to measure the last mixing angle theta_13. KASKA is an experiment to detect new type of reactor neutrino oscillation and to measure sin^2 2theta_13 accurately using the world's most powerful nuclear reactor complex; Kashiwazaki-Kariwa nuclear power station. KASKA utilizes near and far detectors of identical structure at nearly optimized baselines and underground depths to cancel most of the systematics and reduce backgrounds....
Source: http://arxiv.org/abs/hep-ex/0607013v1

Arxiv.org

4 4.0

Status Report (22th J-PARC PAC): Searching for a Sterile Neutrino at J-PARC MLF (E56, JSNS2)

Jun 29, 2018 06/18

by M. Harada; S. Hasegawa; Y. Kasugai; S. Meigo; K. Sakai; S. Sakamoto; K. Suzuya; T. Maruyama; S. Monjushiro; K. Nishikawa; M. Taira; S. Iwata; T. Kawasaki; M. Niiyama; S. Ajimura; T. Hiraiwa; T. Nakano; M. Nomachi; T. Shima; Y. Sugaya; T. J. C. Bezerra; E. Chauveau; H. Furuta; Y. Hino; F. Suekane; I. Stancu; M. Yeh; W. Toki; H. Ray; G. T. Garvey; C. Mauger; W. C. Louis; G. B. Mills; R. Van de Water; E. Iwai; J. Jordan; J. Spitz

eye 4

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The JSNS$^2$ (J-PARC E56) experiment aims to search for a sterile neutrino at the J-PARC Materials and Life Sciences Experimental Facility (MLF). After the submission of a proposal to the J-PARC PAC, Stage-1 approval was granted to the JSNS$^2$ experiment on April 2015.This approval followed a series of background measurements which were performed in 2014. Recently, funding (the grant-in-aid for scientific research (S)) in Japan for building one 25~ton fiducial volume detector module was...
Topics: High Energy Physics - Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1610.08186

Arxiv.org

46 46

Near-threshold Lambda(1520) production by the gamma p -> K+Lambda(1520) reaction at forward K+ angles

Sep 22, 2013 09/13

by H. Kohri; D. S. Ahn; J. K. Ahn; H. Akimune; W. C. Chang; S. Date'; H. Ejiri; S. Fukui; H. Fujimura; M. Fujiwara; K. Hicks; A. Hosaka; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; K. Kino; S. Makino; T. Matsuda; T. Matsumura T. Mibe; M. Miyabe; Y. Miyachi; N. Muramatsu; T. Nakano; S. i. Nam; M. Niiyama; M. Nomachi; Y. Ohashi; C. Rangacharyulu; A. Sakaguchi; H. Shimizu; Y. Sugaya; M. Sumihama; A. I. Titov; Y. Toi; K. Yonehara; T. Yorita; M. Yosoi; R. G. T. Zegers

eye 46

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Differential cross sections and photon-beam asymmetries for the gamma p -> K+ Lambda(1520) reaction have been measured with linearly polarized photon beams at energies from the threshold to 2.4 GeV at 0.6=5/2 or by a new reaction process, for example an interference effect with the phi photoproduction having a similar bump structure in the cross sections.
Source: http://arxiv.org/abs/0906.0197v2

Arxiv.org

63 63

phi photo-production from Li, C, Al, and Cu nuclei at Egamma=1.5 - 2.4 GeV

Sep 23, 2013 09/13

by T. Ishikawa; D. S. Ahn; J. K. Ahn; H. Akimune; W. C. Chang; S. Date; H. Fujimura; M. Fujiwara; K. Hicks; T. Hotta; K. Imai; H. Kawai; K. Kino; H. Kohri; T. Matsumura; T. Mibe; K. Miwa; M. Miyabe; M. Morita; T. Murakami; N. Muramatsu; H. Nakamura; M. Nakamura; T. Nakano; M. Niiyama; M. Nomachi; Y. Ohashi; T. Ooba; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; Y. Shiino; Y. Sakemi; H. Shimizu; Y. Sugaya; M. Sumihama; Y. Toi; H. Toyokawa; C. W. Wang; T. Yorita; M. Yosoi; R. G. T. Zegers

eye 63

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The photo-production of $\phi$ mesons from Li, C, Al, and Cu at forward angles has been measured at $E_gamma$=1.5--2.4 GeV. The number of events for incoherent phi photo-production is found to have a target mass number dependence of $A^{0.72\pm 0.07}$ in the kinematical region of $|t|\le 0.6$ ${\rm GeV}^2/c^2$. The total cross section of the $\phi$-nucleon interaction, $\sigma_{\phi N}$, has been estimated as $35^{+17}_{-11}$ mb using the $A$-dependence of the $\phi$ photo-production yield and...
Source: http://arxiv.org/abs/nucl-ex/0411016v1

Arxiv.org

91 91

Differential cross section and photon beam asymmetry for the gamma n -> K+ Sigma- reaction at Egamma=1.5-2.4 GeV

Sep 21, 2013 09/13

by H. Kohri; D. S. Ahn; J. K. Ahn; H. Akimune; Y. Asano; W. C. Chang; S. Date'; H. Ejiri; S. Fukui; H. Fujimura; M. Fujiwara; S. Hasegawa; K. Hicks; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; H. Kawai; K. Kino; S. Makino; T. Mart; T. Matsuda; T. Matsumura; T. Mibe; M. Miyabe; Y. Miyachi; N. Muramatsu; T. Nakano; M. Niiyama; M. Nomachi; Y. Ohashi; T. Ooba; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; P. M. Shagin; A. Shimizu; H. Shimizu; Y. Sugaya; M. Sumihama; Y. Toi; H. Toyokawa; K. Yonehara; T....

eye 91

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Differential cross sections and photon beam asymmetries have been measured for the gamma n -> K+ Sigma- and gamma p -> K+ Sigma0 reactions separately using liquid deuterium and hydrogen targets with incident linearly polarized photon beams of Egamma=1.5-2.4 GeV at 0.6
Source: http://arxiv.org/abs/hep-ex/0602015v2

Arxiv.org

46 46

Backward-angle photoproduction of $π^0$ mesons on the proton at $E_γ$ = 1.5--2.4 GeV

Sep 19, 2013 09/13

by M. Sumihama; J. K. Ahn; H. Akimune; Y. Asano; W. C. Chang; S. Daté; H. Ejiri; H. Fujimura; M. Fujiwara; K. Hicks; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; H. Kawai; Z. Y. Kim; K. Kino; H. Kohri; N. Kumagai; S. Makino; T. Matsumura; N. Matsuoka; T. Mibe; M. Miyabe; Y. Miyachi; M. Morita; N. Muramatsu; T. Nakano; M. Niiyama; M. Nomachi; Y. Ohashi; H. Ohkuma; T. Ooba; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; T. Sato; P. M. Shagin; Y. Shiino; H. Shimizu; Y. Sugaya; H. Toyokawa; A. Wakai; C....

eye 46

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Differential cross sections and photon beam asymmetries for $\pi^0$ photoproduction have been measured at $E_\gamma$ = 1.5--2.4 GeV and at the $\pi^0$ scattering angles, --1 $
Source: http://arxiv.org/abs/0708.1600v1

Arxiv.org

58 58

Beam polarization asymmetries for the p(gamma,K+)Lambda and p(gamma,K+)Sigma0 reactions at Egamma=1.5-2.4 GeV

Sep 19, 2013 09/13

by LEPS Collaboration; R. G. T. Zegers; M. Sumihama; D. S. Ahn; J. K. Ahn; H. Akimune; Y. Asano; W. C. Chang; S. Date; H. Ejiri; H. Fujimura; M. Fujiwara; K. Hicks; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; H. Kawai; Z. Y. Kim; K. Kino; H. Kohri; N. Kumagai; S. Makino; T. Matsumura; N. Matsuoka; T. Mibe; K. Miwa; M. Miyabe; Y. Miyachi; M. Morita; N. Muramatsu; T. Nakano; M. Niiyama; M. Nomachi; Y. Ohashi; T. Ooba; H. Ohkuma; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; T. Sasaki; P. M. Shagin; Y....

eye 58

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Beam polarization asymmetries for the p(gamma,K+)Lambda and p(gamma,K+)sigma0 reactions are measured for the first time for Egamma=1.5-2.4 GeV and 0.6
Source: http://arxiv.org/abs/nucl-ex/0302005v2

Arxiv.org

60 60

Backward-angle photoproduction of eta meson from protons at E_gamma = 1.6 - 2.4 GeV

Sep 19, 2013 09/13

by M. Sumihama; D. S. Ahn; J. K. Ahn; H. Akimune; Y. Asano; W. C. Chang; S. Date; H. Ejiri; H. Fujimura; M. Fujiwara; S. Fukui; S. Hasegawa; K. Hicks; T. Hotta; K. Imai; 0 T. Ishikawa; T. Iwata; Y. Kato; H. Kawai; K. Kino; H. Kohri; N. Kumagai; T. Matsuda; T. Matsumura; T. Mibe; M. Miyabe; N. Muramatsu; T. Nakano; M. Niiyama; M. Nomachi; Y. Ohashi; H. Ohkuma; T. Ooba; D. S. Oshuev; C. Rangacharyulu; 0 A. Sakaguchi; P. M. Shagin; Y. Shiino; A. Shimizu; H. Shimizu; Y. Sugaya; Y. Toi; H. Toyokawa; A....

eye 60

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Differential cross sections for eta photoproduction off protons have been measured at E_gamma = 1.6 - 2.4 GeV in the backward direction. A bump structure has been observed above 2.0 GeV in the total energy. No such bump is observed in cross sections for eta', omega and pi0 photoproductions. It is inferred that this unique structure in eta photoproduction is due to a baryon resonance with a large portion of ss-bar strongly coupled to the etaN channel.
Source: http://arxiv.org/abs/0910.0900v1

Arxiv.org

59 59

Multi-layer scintillation detector for the MOON double beta decay experiment: Scintillation photon responses studied by a prototype detector MOON-1

Jul 20, 2013 07/13

by H. Nakamura; P. Doe; H. Ejiri; S. R. Elliott; J. Engel; M. Finger; M. Finger. Jr; K. Fushimi; V. Gehman; A. Gorin; M. Greenfield; V. H. Hai; R. Hazama; K. Higa; T. Higashiguchi; K. Ichihara; Y. Ikegami; J. Imoto; H. Ishii; T. Itahashi; H. Kaneko; P. Kavitov; H. Kawasuso; V. Kekelidze; K. Matsuoka; T. Mizuhashi; D. Noda; M. Nomachi; K. Onishi; T. Ogama; A. Para; R. G. H. Robertson; M. Sakamoto; T. Sakiuchi; Y. Samejima; Y. Shichijo; T. Shima; Y. Shimada; G. Shirkov; A. Sissakian; M. Slunecka; Y....

eye 59

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An ensemble of multi-layer scintillators is discussed as an option of the high-sensitivity detector Mo Observatory Of Neutrinos (MOON) for spectroscopic measurements of neutrino-less double beta decays. A prototype detector MOON-1, which consists of 6 layer plastic-scintillator plates, was built to study the sensitivity of the MOON-type detector. The scintillation photon collection and the energy resolution, which are key elements for the high-sensitivity experiments, are found to be 1835+/-30...
Source: http://arxiv.org/abs/nucl-ex/0609008v2

Arxiv.org

60 60

$Diffractive $φ$-meson photoproduction on proton near threshold$

Diffractive $φ$-meson photoproduction on proton near threshold

Sep 20, 2013 09/13

by T. Mibe; W. C. Chang; T. Nakano; D. S. Ahn; J. K. Ahn; H. Akimune; Y. Asano; S. Date\'; H. Ejiri; H. Fujimura; M. Fujiwara; K. Hicks; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; H. Kawai; Z. Y. Kim; K. Kino; H. Kohri; N. Kumagai; S. Makino; T. Matsuda; T. Matsumura; N. Matsuoka; K. Miwa; M. Miyabe; Y. Miyachi; M. Morita; N. Muramatsu; M. Niiyama; M. Nomachi; Y. Ohashi; T. Ooba; H. Ohkuma; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; T. Sasaki; P. M. Shagin; Y. Shiino; H. Shimizu; Y. Sugaya; M....

eye 60

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Photoproduction of $\phi$-meson on protons was studied by means of linearly polarized photons at forward angles in the low-energy region from threshold to $E_{\gamma}$= 2.37 GeV. The differential cross sections at $t = -|t|_{min}$ do not increase smoothly as $E_{\gamma}$ increases, but show a local maximum at around 2.0 GeV. The angular distributions demonstrate that $\phi$-mesons are photo-produced predominantly by helicity-conserving processes, and the local maximum is not likely due to...
Source: http://arxiv.org/abs/nucl-ex/0506015v3

Arxiv.org

36 36

Near-threshold photoproduction of $Λ(1520)$ from protons and deuterons

Sep 23, 2013 09/13

by LEPS Collaboration; N. Muramatsu; J. Y. Chen; W. C. Chang; D. S. Ahn; J. K. Ahn; H. Akimune; Y. Asano; S. Daté; H. Ejiri; H. Fujimura; M. Fujiwara; S. Fukui; S. Hasegawa; K. Hicks; K. Horie; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; Y. Kato; H. Kawai; K. Kino; H. Kohri; N. Kumagai; S. Makino; T. Matsuda; T. Matsumura; N. Matsuoka; T. Mibe; M. Miyabe; M. Miyachi; T. Nakano; M. Niiyama; M. Nomachi; Y. Ohashi; H. Ohkuma; T. Ooba; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; P. M. Shagin; Y....

eye 36

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Photoproduction of $\Lambda$(1520) with liquid hydrogen and deuterium targets was examined at photon energies below 2.4 GeV in the SPring-8 LEPS experiment. For the first time, the differential cross sections were measured at low energies and with a deuterium target. A large asymmetry of the production cross sections from protons and neutrons was observed at backward K$^{+/0}$ angles. This suggests the importance of the contact term, which coexists with t-channel K exchange under gauge...
Source: http://arxiv.org/abs/0904.2034v2

Arxiv.org

48 48

$Evidence of the Θ^+ in the γd \to K^+K^-pn reaction$

Evidence of the Θ^+ in the γd \to K^+K^-pn reaction

Sep 22, 2013 09/13

by T. Nakano; N. Muramatsu; D. S. Ahn; J. K. Ahn; H. Akimune; Y. Asano; W. C. Chang; S. Daté; H. Ejiri; H. Fujimura; M. Fujiwara; S. Fukui; H. Hasegawa; K. Hicks; K. Horie; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; Y. Kato; H. Kawai; Z. Y. Kim; K. Kino; H. Kohri; N. Kumagai; S. Makino; T. Matsuda; N. Matsuoka; T. Matsumura; T. Mibe; M. Miyabe; Y. Miyachi; M. Niiyama; M. Nomachi; Y. Ohashi; H. Ohkuma; T. Ooba; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; P. M. Shagin; Y. Shiino; A. Shimizu; H....

eye 48

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The \gamma d \to K^+K^-pn reaction has been studied to search for the evidence of the \Theta^+ by detecting K^+K^- pairs at forward angles. The Fermi-motion corrected nK^+ invariant mass distribution shows a narrow peak at 1.524 +- 0.002 + 0.003 GeV/c^2. The statistical significance of the peak calculated from a shape analysis is 5.1 \sigma, and the differential cross-section for the \gamma n \to K^- \Theta^+ reaction is estimated to be 12 +- 2 nb/sr in the photon energy range from 2.0 GeV to...
Source: http://arxiv.org/abs/0812.1035v1

Arxiv.org

42 42

Measurement of Spin-Density Matrix Elements for $φ$-Meson Photoproduction from Protons and Deuterons Near Threshold

Sep 23, 2013 09/13

by W. C. Chang; D. S. Ahn; J. K. Ahn; H. Akimune; Y. Asano; S. Daté; H. Ejiri; H. Fujimura; M. Fujiwara; S. Fukui; H. Hasegawa; K. Hicks; K. Horie; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; Y. Kato; H. Kawai; K. Kino; H. Kohri; N. Kumagai; P. J. Lin; S. Makino; T. Matsuda; T. Matsumura; N. Matsuoka; T. Mibe; M. Miyabe; Y. Miyachi; N. Muramatsu; T. Nakano; M. Niiyama; M. Nomachi; Y. Ohashi; H. Ohkuma; T. Ooba; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; P. M. Shagin; Y. Shiino; H. Shimizu; Y....

eye 42

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The LEPS/SPring-8 experiment made a comprehensive measurement of the spin-density matrix elements for $\gamma p \to \phi p$, $\gamma d \to \phi p n$ and $\gamma d \to \phi d$ at forward production angles. A linearly polarized photon beam at $E_{\gamma}$=1.6-2.4 GeV was used for the production of $\phi$ mesons. The natural-parity Pomeron exchange processes remains dominant nearthreshold. The unnatural-parity processes of pseudoscalar exchange is visible in the production from nucleons but is...
Source: http://arxiv.org/abs/1006.4197v2

Arxiv.org

52 52

Forward coherent $φ$-meson photoproduction from deuterons near threshold

Sep 19, 2013 09/13

by W. C. Chang; K. Horie; S. Shimizu; M. Miyabe; D. S. Ahn; J. K. Ahn; H. Akimune; Y. Asano; S. Date; H. Ejiri; S. Fukui; H. Fujimura; M. Fujiwara; S. Hasegawa; K. Hicks; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; Y. Kato; H. Kawai; Z. Y. Kim; K. Kino; H. Kohri; N. Kumagai; P. J. Lin; S. Makino; T. Matsuda; T. Matsumura; N. Matsuoka; T. Mibe; Y. Miyachi; M. Morita; N. Muramatsu; T. Nakano; M. Niiyama; M. Nomachi; Y. Ohashi; H. Ohkuma; T. Ooba; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; T....

eye 52

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Differential cross sections and decay asymmetries for coherent $\phi$-meson photoproduction from deuterons were measured for the first time at forward angles using linearly polarized photons at $E_{\gamma}$= 1.5-2.4 GeV. This reaction offers a unique way to directly access natural-parity Pomeron dynamics and gluon exchange at low energies. The cross sections at zero degrees increase with increasing photon energy. The decay asymmetries demonstrate a complete dominance of natural-parity exchange...
Source: http://arxiv.org/abs/nucl-ex/0703034v2

Arxiv.org

114 114

Hard X-ray Detector (HXD) on Board Suzaku

Sep 18, 2013 09/13

by T. Takahashi; K. Abe; M. Endo; Y. Endo; Y. Ezoe; Y. Fukazawa; M. Hamaya; S. Hirakuri; S. Hong; M. Horii; H. Inoue; N. Isobe; T. Itoh; N. Iyomoto; T. Kamae; D. Kasama; J. Kataoka; H. Kato; M. Kawaharada; N. Kawano; K. Kawashima; S. Kawasoe; T. Kishishita; T. Kitaguchi; Y. Kobayashi; M. Kokubun; J. Kotoku; M. Kouda; A. Kubota; Y. Kuroda; G. Madejski; K. Makishima; K. Masukawa; Y. Matsumoto; T. Mitani; R. Miyawaki; T. Mizuno; K. Mori; M. Mori; M. Murashima; T. Murakami; K. Nakazawa; H. Niko; M....

eye 114

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The Hard X-ray Detector (HXD) on board Suzaku covers a wide energy range from 10 keV to 600 keV by combination of silicon PIN diodes and GSO scintillators. The HXD is designed to achieve an extremely low in-orbit back ground based on a combination of new techniques, including the concept of well-type active shield counter. With an effective area of 142 cm^2 at 20 keV and 273 cm2 at 150 keV, the background level at the sea level reached ~1x10^{-5} cts s^{-1} cm^{-2} keV^{-1} at 30 keV for the PI...
Source: http://arxiv.org/abs/astro-ph/0611232v1

Arxiv.org

41 41

$Search for a light pseudoscalar particle in the decay $K^0_L \to π^0 π^0 X$$

Search for a light pseudoscalar particle in the decay $K^0_L \to π^0 π^0 X$

Sep 23, 2013 09/13

by Y. C. Tung; Y. B. Hsiung; M. L. Wu; K. F. Chen; J. K. Ahn; Y. Akune; V. Baranov; J. Comfort; M. Doroshenko; Y. Fujioka; T. Inagaki; S. Ishibashi; N. Ishihara; H. Ishii; E. Iwai; T. Iwata; I. Kato; S. Kobayashi; T. K. Komatsubara; A. S. Kurilin; E. Kuzmin; A. Lednev; H. S. Lee; S. Y. Lee; G. Y. Lim; J. Ma; T. Matsumura; A. Moisseenko; H. Morii; T. Morimoto; T. Nakano; H. Nanjo; J. Nix; T. Nomura; M. Nomachi; R. Ogata; H. Okuno; K. Omata; G. N. Perdue; S. Podolsky; K. Sakashita; T. Sasaki; N....

eye 41

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We performed a search for a light pseudoscalar particle $X$ in the decay $K_L^0->pi0pi0X$, $X->\gamma\gamma$ with the E391a detector at KEK. Such a particle with a mass of 214.3 MeV/$c^2$ was suggested by the HyperCP experiment. We found no evidence for $X$ and set an upper limit on the product branching ratio for $K_L^0->pi0pi0X$, $X->\gamma\gamma$ of $2.4 \times 10^{-7}$ at the 90% confidence level. Upper limits on the branching ratios in the mass region of $X$ from 194.3 to 219.3...
Source: http://arxiv.org/abs/0810.4222v3

Arxiv.org

5 5.0

$Search for heavy neutrinos in $K^+\to\mu^+\nu_H$ decays$

Search for heavy neutrinos in $K^+\to\mu^+\nu_H$ decays

Jun 30, 2018 06/18

by A. V. Artamonov; B. Bassalleck; B. Bhuyan; E. W. Blackmore; D. A. Bryman; S. Chen; I-H. Chiang; I. -A. Christidi; P. S. Cooper; M. V. Diwan; J. S. Frank; T. Fujiwara; J. Hu; J. Ives; A. O. Izmaylov; D. E. Jaffe; S. Kabe; S. H. Kettell; M. M. Khabibullin; A. N. Khotjantsev; P. Kitching; M. Kobayashi; T. K. Komatsubara; A. Konaka; Yu. G. Kudenko; L. G. Landsberg; B. Lewis; K. K. Li; L. S. Littenberg; J. A. Macdonald; J. Mildenberger; O. V. Mineev; M. Miyajima; K. Mizouchi; N. Muramatsu; T....

eye 5

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Evidence of a heavy neutrino, $\nu_H$, in the $K^+\to\mu^+\nu_H$ decays was sought using the E949 experimental data with an exposure of $1.70\times 10^{12}$ stopped kaons. With the major background from the radiative $K^+\to\mu^+\nu_\mu\gamma$ decay understood and suppressed, upper limits (90% C.L.) on the neutrino mixing matrix element between muon and heavy neutrino, $|U_{\mu H}|^2$, were set at the level of $10^{-7}$ to $10^{-9}$ for the heavy neutrino mass region 175 to 300 MeV/$c^2$.
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1411.3963

Arxiv.org

8 8.0

$Search for the rare decay $K^+\to\mu^+\nu\bar\nu\nu$$

Search for the rare decay $K^+\to\mu^+\nu\bar\nu\nu$

Jun 29, 2018 06/18

eye 8

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Evidence of the $K^+\to\mu^+\nu\bar\nu\nu$ decay was searched for using E949 experimental data with an exposure of $1.70\times 10^{12}$ stopped kaons. The data sample is dominated by the backgrond process $K^+\to\mu^+\nu_\mu\gamma$. An upper limit on the decay rate $\Gamma(K^+\to\mu^+\nu\bar\nu\nu) < 2.4\times 10^{-6}\Gamma(K^+\to all)$ at 90% confidence level was set assuming the Standard Model muon spectrum. The data are presented in such a way as to allow calculation of rates for any...
Topic: High Energy Physics - Experiment
Source: http://arxiv.org/abs/1606.09054

Arxiv.org

51 51

$Search for the decay $K_L^0 \rightarrow 3γ$$

Search for the decay $K_L^0 \rightarrow 3γ$

Sep 21, 2013 09/13

by Y. C. Tung; Y. B. Hsiung; J. K. Ahn; Y. Akune; V. Baranov; K. F. Chen; J. Comfort; M. Doroshenko; Y. Fujioka; T. Inagaki; S. Ishibashi; N. Ishihara; H. Ishii; E. Iwai; T. Iwata; I. Kato; S. Kobayashi; S. Komatsu; T. K. Komatsubara; A. S. Kurilin; E. Kuzmin; A. Lednev; H. S. Lee; S. Y. Lee; G. Y. Lim; J. Ma; T. Matsumura; A. Moisseenko; H. Morii; T. Morimoto; Y. Nakajima; T. Nakano; H. Nanjo; N. Nishi; J. Nix; T. Nomura; M. Nomachi; R. Ogata; H. Okuno; K. Omata; G. N. Perdue; S. Perov; S....

eye 51

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We performed a search for the decay $K_L^0 \rightarrow 3\gamma$ with the E391a detector at KEK. In the data accumulated in 2005, no event was observed in the signal region. Based on the assumption of $K_L^0 \rightarrow 3\gamma$ proceeding via parity-violation, we obtained the single event sensitivity to be $(3.23\pm0.14)\times10^{-8}$, and set an upper limit on the branching ratio to be $7.4\times10^{-8}$ at the 90% confidence level. This is a factor of 3.2 improvement compared to the previous...
Source: http://arxiv.org/abs/1011.4403v2

Arxiv.org

64 64

Study of the decay K+ => pi+,nu,nubar in the momentum region 140

Sep 23, 2013 09/13

by E949 Collaboration; A. V. Artamonov; B. Bassalleck; B. Bhuyan; E. W. Blackmore; D. A. Bryman; S. Chen; I-H. Chiang; I. -A. Christidi; P. S. Cooper; M. V. Diwan; J. S. Frank; T. Fujiwara; J. Hu; J. Ives; D. E. Jaffe; S. Kabe; S. H. Kettell; M. M. Khabibullin; A. N. Khotjantsev; P. Kitching; M. Kobayashi; T. K. Komatsubara; A. Konaka; A. P. Kozhevnikov; Yu. G. Kudenko; A. Kushnirenko; L. G. Landsberg; B. Lewis; K. K. Li; L. S. Littenberg; J. A. Macdonald; J. Mildenberger; O. V. Mineev; M....

eye 64

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Experiment E949 at Brookhaven National Laboratory has observed three new events consistent with the decay K+ => pi+,nu,nubar in the pion momentum region 140 < P_pi < 199 MeV/c in an exposure of 1.71e12 stopped kaons with an estimated total background of 0.93+-0.17(stat.)+0.32-0.24(syst.) events. This brings the total number of observed K+ => pi+,nu,nubar events to seven. Combining this observation with previous results, assuming the pion spectrum predicted by the standard model,...
Source: http://arxiv.org/abs/0903.0030v1

Arxiv.org

6 6.0

$Interference effect between $\phi$ and $\Lambda(1520)$ production channels in the $\gamma p \rightarrow K^+K^-p$ reaction near threshold$

Interference effect between $\phi$ and $\Lambda(1520)$ production channels in the $\gamma p \rightarrow K^+K^-p$ reaction near threshold

Jun 29, 2018 06/18

by S. Y. Ryu; J. K. Ahn; T. Nakano; D. S. Ahn; S. Ajimura; H. Akimune; Y. Asano; W. C. Chang; J. Y. Chen; S. Date; H. Ejiri; H. Fujimura; M. Fujiwara; S. Fukui; S. Hasegawa; K. Hicks; K. Horie; T. Hotta; S. H. Hwang; K. Imai; T. Ishikawa; T. Iwata; Y. Kato; H. Kawai; K. Kino; H. Kohri; Y. Kon; N. Kumagai; P. J. Lin; Y. Maeda; S. Makino; T. Matsuda; N. Matsuoka; T. Mibe; M. Miyabe; M. Miyachi; Y. Morino; N. Muramatsu; R. Murayama; Y. Nakatsugawa; S. i. Nam; M. Niiyama; M. Nomachi; Y. Ohashi; H....

eye 6

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The $\phi$-$\Lambda(1520)$ interference effect in the $\gamma p\to K^+K^-p$ reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between $\phi$ and $\Lambda(1520)$ production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference when $K^+K^-$ pairs are observed at forward angles, but destructive interference for proton emission at forward...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1603.00236

Arxiv.org

45 45

Study of the K0(L) --> pi0 pi0 nu nu-bar decay

Sep 21, 2013 09/13

by E391a Collaboration; R. Ogata; S. Suzuki; J. K. Ahn; Y. Akune; V. Baranov; K. F. Chen; J. Comfort; M. Doroshenko; Y. Fujioka; Y. B. Hsiung; T. Inagaki; S. Ishibashi; N. Ishihara; H. Ishii; E. Iwai; T. Iwata; I. Kato; S. Kobayashi; S. Komatsu; T. K. Komatsubara; A. S. Kurilin; E. Kuzmin; A. Lednev; H. S. Lee; S. Y. Lee; G. Y. Lim; J. Ma; T. Matsumura; A. Moisseenko; H. Morii; T. Morimoto; Y. Nakajima; T. Nakano; H. Nanjo; N. Nishi; J. Nix; T. Nomura; M. Nomachi; H. Okuno; K. Omata; G. N. Perdue;...

eye 45

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The rare decay K0(L) --> pi0 pi0 nu nu-bar was studied with the E391a detector at the KEK 12-GeV proton synchrotron. Based on 9.4 x 10^9 K0L decays, an upper limit of 8.1 x 10^{-7} was obtained for the branching fraction at 90% confidence level. We also set a limit on the K0(L) --> pi0 pi0 X (X --> invisible particles) process; the limit on the branching fraction varied from 7.0 x 10^{-7} to 4.0 x 10^{-5} for the mass of X ranging from 50 MeV/c^2 to 200 MeV/c^2.
Source: http://arxiv.org/abs/1106.3404v2

Arxiv.org

11 11

$Result of the search for neutrinoless double-$\beta$ decay in $^{100}$Mo with the NEMO-3 experiment$

Result of the search for neutrinoless double-$\beta$ decay in $^{100}$Mo with the NEMO-3 experiment

Jun 28, 2018 06/18

by R. Arnold; C. Augier; J. D. Baker; A. S. Barabash; A. Basharina-Freshville; S. Blondel; S. Blot; M. Bongrand; V. Brudanin; J. Busto; A. J. Caffrey; S. Calvez; C. Cerna; J. P. Cesar; A. Chapon; E. Chauveau; D. Duchesneau; D. Durand; V. Egorov; G. Eurin; J. J. Evans; L. Fajt; D. Filosofov; R. Flack; X. Garrido; H. Gómez; B. Guillon; P. Guzowski; R. Hodák; A. Huber; P. Hubert; C. Hugon; S. Jullian; A. Klimenko; O. Kochetov; S. I. Konovalov; V. Kovalenko; D. Lalanne; K. Lang; Y. Lemière; T. Le...

eye 11

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The NEMO-3 detector, which had been operating in the Modane Underground Laboratory from 2003 to 2010, was designed to search for neutrinoless double $\beta$ ($0\nu\beta\beta$) decay. We report final results of a search for $0\nu\beta\beta$ decays with $6.914$ kg of $^{100}$Mo using the entire NEMO-3 data set with a detector live time of $4.96$ yr, which corresponds to an exposure of 34.3 kg$\cdot$yr. We perform a detailed study of the expected background in the $0\nu\beta\beta$ signal region...
Topics: Instrumentation and Detectors, Physics, Nuclear Experiment, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1506.05825

Arxiv.org

93 93

Probing New Physics Models of Neutrinoless Double Beta Decay with SuperNEMO

Jul 19, 2013 07/13

by R. Arnold; C. Augier; J. Baker; A. S. Barabash; A. Basharina-Freshville; M. Bongrand; V. Brudanin; A. J. Caffrey; S. Cebrián; A. Chapon; E. Chauveau; Th. Dafni; F. F. Deppisch; J. Diaz; D. Durand; V. Egorov; J. J. Evans; R. Flack; K-I. Fushima; I. García Irastorza; X. Garrido; H. Gómez; B. Guillon; A. Holin; K. Holy; J. J. Horkley; Ph. Hubert; C. Hugon; F. J. Iguaz; N. Ishihara; C. M. Jackson; S. Jullian; M. Kauer; O. Kochetov; S. I. Konovalov; V. Kovalenko; T. Lamhamdi; K. Lang; G. Lutter;...

eye 93

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The possibility to probe new physics scenarios of light Majorana neutrino exchange and right-handed currents at the planned next generation neutrinoless double beta decay experiment SuperNEMO is discussed. Its ability to study different isotopes and track the outgoing electrons provides the means to discriminate different underlying mechanisms for the neutrinoless double beta decay by measuring the decay half-life and the electron angular and energy distributions.
Source: http://arxiv.org/abs/1005.1241v2

Arxiv.org

10 10.0

$Measurement of the $2\nu\beta\beta$ Decay Half-Life and Search for the $0\nu\beta\beta$ Decay of $^{116}$Cd with the NEMO-3 Detector$

Measurement of the $2\nu\beta\beta$ Decay Half-Life and Search for the $0\nu\beta\beta$ Decay of $^{116}$Cd with the NEMO-3 Detector

Jun 29, 2018 06/18

by NEMO-3 Collaboration; :; R. Arnold; C. Augier; J. D. Baker; A. S. Barabash; A. Basharina-Freshville; S. Blondel; S. Blot; M. Bongrand; D. Boursette; V. Brudanin; J. Busto; A. J. Caffrey; S. Calvez; M. Cascella; C. Cerna; J. P. Cesar; A. Chapon; E. Chauveau; A. Chopra; D. Duchesneau; D. Durand; V. Egorov; G. Eurin; J. J. Evans; L. Fajt; D. Filosofov; R. Flack; X. Garrido; H. Gómez; B. Guillon; P. Guzowski; R. Hodák; A. Huber; P. Hubert; C. Hugon; S. Jullian; A. Klimenko; O. Kochetov; S. I....

eye 10

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The NEMO-3 experiment measured the half-life of the $2\nu\beta\beta$ decay and searched for the $0\nu\beta\beta$ decay of $^{116}$Cd. Using $410$ g of $^{116}$Cd installed in the detector with an exposure of $5.26$ y, ($4968\pm74$) events corresponding to the $2\nu\beta\beta$ decay of $^{116}$Cd to the ground state of $^{116}$Sn have been observed with a signal to background ratio of about $12$. The half-life of the $2\nu\beta\beta$ decay has been measured to be $...
Topics: Instrumentation and Detectors, Physics, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1610.03226

Arxiv.org

4 4.0

$Measurement of the 2$\nu\beta\beta$ decay half-life of $^{150}$Nd and a search for 0$\nu\beta\beta$ decay processes with the full exposure from the NEMO-3 detector$

Measurement of the 2$\nu\beta\beta$ decay half-life of $^{150}$Nd and a search for 0$\nu\beta\beta$ decay processes with the full exposure from the NEMO-3 detector

Jun 29, 2018 06/18

by NEMO-3 Collaboration; :; R. Arnold; C. Augier; J. D. Baker; A. S. Barabash; A. Basharina-Freshville; S. Blondel; S. Blot; M. Bongrand; V. Brudanin; J. Busto; A. J. Caffrey; S. Calvez; M. Cascell; C. Cerna; J. P. Cesar; A. Chapon; E. Chauveau; A. Chopra; D. Duchesneau; D. Durand; V. Egorov; G. Eurin; J. J. Evans; L. Fajt; D. Filosofov; R. Flack; X. Garrido; H. Gòmez; B. Guillon; P. Guzowski; R. Hodák; A. Huber; P. Hubert; C. Hugon; S. Jullian; A. Klimenko; O. Kochetov; S. I. Konovalov; V....

eye 4

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We present results from a search for neutrinoless double-$\beta$ ($0\nu\beta\beta$) decay using 36.6 g of the isotope $^{150}$Nd with data corresponding to a live time of 5.25 y recorded with the NEMO-3 detector. We construct a complete background model for this isotope, including a measurement of the two-neutrino double-$\beta$ decay half-life of $T^{2\nu}_{1/2}=$[9.34 $\pm$ 0.22 (stat.) $^{+0.62}_{-0.60}$ (syst.)]$\times 10^{18}$ y for the ground state transition, which represents the most...
Topics: Instrumentation and Detectors, Nuclear Experiment, Physics, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1606.08494

Arxiv.org

3 3.0

Background Model for the Majorana Demonstrator

Jun 30, 2018 06/18

by C. Cuesta; N. Abgrall; E. Aguayo; F. T. Avignone; A. S. Barabash; F. E. Bertrand; M. Boswell; V. Brudanin; M. Busch; D. Byram; A. S. Caldwell; Y-D. Chan; C. D. Christofferson; D. C. Combs; J. A. Detwiler; P. J. Doe; Yu. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. E. Fast; P. Finnerty; F. M. Fraenkle; A. Galindo-Uribarri; G. K. Giovanetti; J. Goett; M. P. Green; J. Gruszko; V. E. Guiseppe; K. Gusev; A. L. Hallin; R. Hazama; A. Hegai; R. Henning; E. W. Hoppe; S. Howard; M. A. Howe; K. J....

eye 3

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The Majorana Collaboration is constructing a system containing 40 kg of HPGe detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale in the inverted-hierarchy region. To realize this, a major goal of the Majorana Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest around the Q-value at 2039 keV. This goal is pursued through a...
Topics: Physics, Nuclear Experiment, Instrumentation and Detectors
Source: http://arxiv.org/abs/1405.1370

Arxiv.org

5 5.0

Testing the Ge detectors for the MAJORANA DEMONSTRATOR

Jun 30, 2018 06/18

by W. Xu; N. Abgrall; E. Aguayo; F. T. Avignone; A. S. Barabash; F. E. Bertrand; M. Boswell; V. Brudanin; M. Busch; D. Byram; A. S. Caldwell; Y-D. Chan; C. D. Christofferson; D. C. Combs; C. Cuesta; J. A. Detwiler; P. J. Doe; Yu. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. E. Fast; P. Finnerty; F. M. Fraenkle; A. Galindo-Uribarri; G. K. Giovanetti; J. Goett; M. P. Green; J. Gruszko; V. E. Guiseppe; K. Gusev; A. L. Hallin; R. Hazama; A. Hegai; R. Henning; E. W. Hoppe; S. Howard; M. A. Howe;...

eye 5

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High purity germanium (HPGe) crystals will be used for the MAJORANA DEMONSTRATOR, where they serve as both the source and the detector for neutrinoless double beta decay. It is crucial for the experiment to understand the performance of the HPGe crystals. A variety of crystal properties are being investigated, including basic properties such as energy resolution, efficiency, uniformity, capacitance, leakage current and crystal axis orientation, as well as more sophisticated properties, e.g....
Topics: Physics, Nuclear Experiment, Instrumentation and Detectors
Source: http://arxiv.org/abs/1404.7399

Arxiv.org

57 57

The MAJORANA DEMONSTRATOR: Progress towards showing the feasibility of a tonne-scale 76Ge neutrinoless double-beta decay experiment

Sep 22, 2013 09/13

by P. Finnerty; E. Aguayo; M. Amman; F. T. Avignone. III; A. S. Barabash; P. J. Barton; J. R. Beene; F. E. Bertrand; M. Boswell; V. Brudanin; M. Busch; Y. -D. Chan; C. D. Christofferson; J. I. Collar; D. C. Combs; R. J. Cooper; J. A. Detwiler; P. J. Doe; Yu. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. Esterline; J. E. Fast; N. Fields; F. M. Fraenkle; A. Galindo-Uribarri; V. M. Gehman; G. K. Giovanetti; M. P. Green; V. E. Guiseppe; K. Gusey; A. L. Hallin; R. Hazama; R. Henning; E. W. Hoppe;...

eye 57

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The MAJORANA DEMONSTRATOR will search for the neutrinoless double-beta decay of the 76Ge isotope with a mixed array of enriched and natural germanium detectors. The observation of this rare decay would indicate the neutrino is its own anti-particle, demonstrate that lepton number is not conserved, and provide information on the absolute mass-scale of the neutrino. The DEMONSTRATOR is being assembled at the 4850 foot level of the Sanford Underground Research Facility in Lead, South Dakota. The...
Source: http://arxiv.org/abs/1210.2678v1

Arxiv.org

53 53

The Majorana experiment: an ultra-low background search for neutrinoless double-beta decay

Sep 23, 2013 09/13

by D. G. Phillips II; E. Aguayo; F. T. Avignone III; H. O. Back; A. S. Barabash; M. Bergevin; F. E. Bertrand; M. Boswell; V. Brudanin; M. Busch; Y. -D. Chan; C. D. Christofferson; J. I. Collar; D. C. Combs; R. J. Cooper; J. A. Detwiler; P. J. Doe; Y. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. Esterline; J. E. Fast; N. Fields; P. Finnerty; F. M. Fraenkle; V. M. Gehman; G. K. Giovanetti; M. P. Green; V. E. Guiseppe; K. Gusey; A. L. Hallin; R. Hazama; R. Henning; A. Hime; E. W. Hoppe; M....

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The observation of neutrinoless double-beta decay would resolve the Majorana nature of the neutrino and could provide information on the absolute scale of the neutrino mass. The initial phase of the Majorana experiment, known as the Demonstrator, will house 40 kg of Ge in an ultra-low background shielded environment at the 4850' level of the Sanford Underground Laboratory in Lead, SD. The objective of the Demonstrator is to determine whether a future 1-tonne experiment can achieve a background...
Source: http://arxiv.org/abs/1111.5578v1

Arxiv.org

10 10.0

$Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay of $^{48}{\rm Ca}$ with the NEMO-3 detector$

Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay of $^{48}{\rm Ca}$ with the NEMO-3 detector

Jun 29, 2018 06/18

by NEMO-3 Collaboration; :; R. Arnold; C. Augier; A. M. Bakalyarov; J. D. Baker; A. S. Barabash; A. Basharina-Freshville; S. Blondel; S. Blot; M. Bongrand; V. Brudanin; J. Busto; A. J. Caffrey; S. Calvez; M. Cascella; C. Cerna; J. P. Cesar; A. Chapon; E. Chauveau; A. Chopra; D. Duchesneau; D. Durand; V. Egorov; G. Eurin; J. J. Evans; L. Fajt; D. Filosofov; R. Flack; X. Garrido; H. Gómez; B. Guillon; P. Guzowski; R. Hodák; A. Huber; P. Hubert; C. Hugon; S. Jullian; A. Klimenko; O. Kochetov; S. I....

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The NEMO-3 experiment at the Modane Underground Laboratory has investigated the double-$\beta$ decay of $^{48}{\rm Ca}$. Using $5.25$ yr of data recorded with a $6.99\,{\rm g}$ sample of $^{48}{\rm Ca}$, approximately $150$ double-$\beta$ decay candidate events have been selected with a signal-to-background ratio greater than $3$. The half-life for the two-neutrino double-$\beta$ decay of $^{48}{\rm Ca}$ has been measured to be $T^{2\nu}_{1/2}\,=\,[6.4\, ^{+0.7}_{-0.6}{\rm (stat.)} \,...
Topics: Instrumentation and Detectors, Nuclear Experiment, Physics, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1604.01710

Arxiv.org

68 68

Characteristics of Signals Originating Near the Lithium-Diffused N+ Contact of High Purity Germanium P-Type Point Contact Detectors

Sep 20, 2013 09/13

by The MAJORANA Collaboration; E. Aguayo; M. Amman; F. T. Avignone III; A. S. Barabash; P. J. Barton; J. R. Beene; F. E. Bertrand; M. Boswell; V. Brudanin; M. Busch; Y-D. Chan; C. D. Christofferson; J. I. Collar; D. C. Combs; R. J. Cooper; J. A. Detwiler; P. J. Doe; Yu. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. Esterline; J. E. Fast; N. Fields; P. Finnerty; F. M. Fraenkle; A. Galindo-Uribarri; V. M. Gehman; G. K. Giovanetti; M. P. Green; V. E. Guiseppe; K. Gusey; A. L. Hallin; R. Hazama;...

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A study of signals originating near the lithium-diffused n+ contact of p-type point contact (PPC) high purity germanium detectors (HPGe) is presented. The transition region between the active germanium and the fully dead layer of the n+ contact is examined. Energy depositions in this transition region are shown to result in partial charge collection. This provides a mechanism for events with a well defined energy to contribute to the continuum of the energy spectrum at lower energies. A novel...
Source: http://arxiv.org/abs/1207.6716v1

Arxiv.org

7 7.0

A Dark Matter Search with MALBEK

Jun 30, 2018 06/18

by G. K. Giovanetti; N. Abgrall; E. Aguayo; F. T. Avignone; A. S. Barabash; F. E. Bertrand; M. Boswell; V. Brudanin; M. Busch; D. Byram; A. S. Caldwell; Y-D. Chan; C. D. Christofferson; D. C. Combs; C. Cuesta; J. A. Detwiler; P. J. Doe; Yu. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. E. Fast; P. Finnerty; F. M. Fraenkle; A. Galindo-Uribarri; J. Goett; M. P. Green; J. Gruszko; V. E. Guiseppe; K. Gusev; A. L. Hallin; R. Hazama; A. Hegai; R. Henning; E. W. Hoppe; S. Howard; M. A. Howe; K. J....

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The MAJORANA DEMONSTRATOR is an array of natural and enriched high purity germanium detectors that will search for the neutrinoless double-beta decay of 76-Ge and perform a search for weakly interacting massive particles (WIMPs) with masses below 10 GeV. As part of the MAJORANA research and development efforts, we have deployed a modified, low-background broad energy germanium detector at the Kimballton Underground Research Facility. With its sub-keV energy threshold, this detector is sensitive...
Topics: Instrumentation and Detectors, Physics, Nuclear Experiment, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1407.2238

Arxiv.org

46 46

The MAJORANA DEMONSTRATOR: A Search for Neutrinoless Double-beta Decay of Germanium-76

Sep 23, 2013 09/13

by MAJORANA Collaboration; A. G. Schubert; E. Aguayo; F. T. Avignone III; H. O. Back; A. S. Barabash; M. Bergevin; F. E. Bertrand; M. Boswell; V. Brudanin; M. Busch; Y-D. Chan; C. D. Christofferson; J. I. Collar; D. C. Combs; R. J. Cooper; J. A. Detwiler; J. Leon; P. J. Doe; Yu. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. Esterline; J. E. Fast; N. Fields; P. Finnerty; F. M. Fraenkle; V. M. Gehman; G. K. Giovanetti; M. P. Green; V. E. Guiseppe; K. Gusey; A. L. Hallin; R. Hazama; R. Henning;...

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The observation of neutrinoless double-beta decay would determine whether the neutrino is a Majorana particle and provide information on the absolute scale of neutrino mass. The MAJORANA Collaboration is constructing the DEMONSTRATOR, an array of germanium detectors, to search for neutrinoless double-beta decay of 76-Ge. The DEMONSTRATOR will contain 40 kg of germanium; up to 30 kg will be enriched to 86% in 76-Ge. The DEMONSTRATOR will be deployed deep underground in an ultra-low-background...
Source: http://arxiv.org/abs/1109.1567v1

Arxiv.org

58 58

Depth Requirements for a Tonne-scale 76Ge Neutrinoless Double-beta Decay Experiment

Sep 23, 2013 09/13

by The MAJORANA Collaboration; E. Aguayo; F. T. Avignone III; H. O. Back; A. S. Barabash; M. Bergevin; F. E. Bertrand; M. Boswell; V. Brudanin; M. Busch; Y-D. Chan; C. D. Christofferson; J. I. Collar; D. C. Combs; R. J. Cooper; J. A. Detwiler; P. J. Doe; Yu. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. Esterline; J. E. Fast; N. Fields; P. Finnerty; F. M. Fraenkle; V. M. Gehman; G. K. Giovanetti; M. P. Green; V. E. Guiseppe; K. Gusey; A. L. Hallin; R. Hazama; R. Henning; A. Hime; E. W. Hoppe;...

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Neutrinoless double-beta decay experiments can potentially determine the Majorana or Dirac nature of the neutrino, and aid in understanding the neutrino absolute mass scale and hierarchy. Future 76Ge-based searches target a half-life sensitivity of >10^27 y to explore the inverted neutrino mass hierarchy. Reaching this sensitivity will require a background rate of ~5200 mwe is required for a tonne-scale experiment with a compact shield similar to the planned 40-kg MAJORANA DEMONSTRATOR. The...
Source: http://arxiv.org/abs/1109.4154v2

Arxiv.org

25 25

The Majorana Parts Tracking Database

Jun 26, 2018 06/18

by The Majorana Collaboration; N. Abgrall; E. Aguayo; F. T. Avignone; A. S. Barabash; F. E. Bertrand; V. Brudanin; M. Busch; D. Byram; A. S. Caldwell; Y-D. Chan; C. D. Christofferson; D. C. Combs; C. Cuesta; J. A. Detwiler; P. J. Doe; Yu. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. Esterline; J. E. Fast; P. Finnerty; F. M. Fraenkle; A. Galindo-Uribarri; G. K. Giovanetti; J. Goett; M. P. Green; J. Gruszko; V. E. Guiseppe; K. Gusev; A. L. Hallin; R. Hazama; A. Hegai; R. Henning; E. W. Hoppe;...

eye 25

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The Majorana Demonstrator is an ultra-low background physics experiment searching for the neutrinoless double beta decay of $^{76}$Ge. The Majorana Parts Tracking Database is used to record the history of components used in the construction of the Demonstrator. The tracking implementation takes a novel approach based on the schema-free database technology CouchDB. Transportation, storage, and processes undergone by parts such as machining or cleaning are linked to part records. Tracking parts...
Topics: Nuclear Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1502.01748

Arxiv.org

73 73

The Majorana Demonstrator

Sep 23, 2013 09/13

by E. Aguayo; J. E. Fast; E. W. Hoppe; M. E. Keillor; J. D. Kephart; R. T. Kouzes; B. D. LaFerriere; J. Merriman; J. L. Orrell; N. R. Overman; F. T. Avignone III; H. O. Back; D. C. Combs; L. E. Leviner; A. R. Young; A. S. Barabash; S. I. Konovalov; I. Vanyushin; V. Yumatov; M. Bergevin; Y-D. Chan; J. A. Detwiler; J. C. Loach; R. D. Martin; A. W. P. Poon; G. Prior; K. Vetter; F. E. Bertrand; R. J. Cooper; D. C. Radford; R. L. Varner; C. -H. Yu; M. Boswell; S. R. Elliott; V. M. Gehman; A. Hime; M....

eye 73

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A brief review of the history and neutrino physics of double beta decay is given. A description of the MAJORANA DEMONSTRATOR research and development program including background reduction techniques is presented in some detail. The application of point contact (PC) detectors to the experiment is discussed, including the effectiveness of pulse shape analysis. The predicted sensitivity of a PC detector array enriched to 86% in 76Ge is given.
Source: http://arxiv.org/abs/1109.6913v1

Arxiv.org

70 70

Astroparticle Physics with a Customized Low-Background Broad Energy Germanium Detector

Sep 24, 2013 09/13

by MAJORANA Collaboration; C. E. Aalseth; M. Amman; F. T. Avignone III; H. O. Back; A. S. Barabash; P. S. Barbeau; M. Bergevin; F. E. Bertrand; M. Boswell; V. Brudanin; W. Bugg; T. H. Burritt; M. Busch; G. Capps; Y-D. Chan; J. I. Collar; R. J. Cooper; R. Creswick; J. A. Detwiler; J. Diaz; P. J. Doe; Yu. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. Ely; J. Esterline; H. Farach; J. E. Fast; N. Fields; P. Finnerty; B. Fujikawa; E. Fuller; V. M. Gehman; G. K. Giovanetti; V. E. Guiseppe; K. Gusey;...

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The MAJORANA Collaboration is building the MAJORANA DEMONSTRATOR, a 60 kg array of high purity germanium detectors housed in an ultra-low background shield at the Sanford Underground Laboratory in Lead, SD. The MAJORANA DEMONSTRATOR will search for neutrinoless double-beta decay of 76Ge while demonstrating the feasibility of a tonne-scale experiment. It may also carry out a dark matter search in the 1-10 GeV/c^2 mass range. We have found that customized Broad Energy Germanium (BEGe) detectors...
Source: http://arxiv.org/abs/1007.3231v2

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