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83
Sep 17, 2013
09/13
by
V. A. Kudryavtsev
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It is considered here the possibility of unitary spinor representations of the Virasoro and super-Virasoro algebras for conformal spin to be equal 1/k; k are integers.
Source: http://arxiv.org/abs/hep-th/0007057v1
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55
Sep 18, 2013
09/13
by
V. A. Kudryavtsev
texts
eye 55
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Hadron dynamics is formulated in terms of interacting composite strings. Consistent composite string model with extended Virasoro superconformal symmetry is found. These composite strings carry flavour and chiral degrees of freedom on edging two-dimensional surfaces. Necessary correct description of string amplitudes without states of negative norms in the spectrum of physical states is reached when special supercurrents conditions are fulfilled.
Source: http://arxiv.org/abs/0809.3123v1
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53
Sep 17, 2013
09/13
by
V. A. Kudryavtsev
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Hadron vertices for u, d, s quark flavours are formulated in terms of interacting composite strings. The vertices for emission of pi, K mesons and nucleons are presented.
Source: http://arxiv.org/abs/1003.3943v1
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97
Jul 20, 2013
07/13
by
V. A. Kudryavtsev
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eye 97
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The ANTARES Collaboration is currently constructing a large neutrino telescope in the Mediterranean sea. The telescope will use a three-dimensional array of photomultiplier tubes (PMTs) to detect the Cherenkov light emitted in sea water by neutrino-induced muons. The array of 12 strings, which hold 900 PMTs, is planned to be deployed at a depth of about 2500 m near Toulon (France), 40 km off the coast. The scientific objective of ANTARES is to detect high-energy neutrinos, which may be produced...
Source: http://arxiv.org/abs/astro-ph/0406124v1
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59
Sep 22, 2013
09/13
by
V. A. Kudryavtsev
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eye 59
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Production of muon pairs by high-energy photons in electromagnetic and hadronic showers in atmosphere has been calculated. The effect of muon pair production in hadronic Extensive Air Showers (EAS) is unlikely to be seen by next generation detectors. Applications of muon pair production process in electromagnetic showers to the very high energy gamma-ray astronomy is discussed. It is shown that, although this process dominates over conventional pion and kaon decay above a few TeV in...
Source: http://arxiv.org/abs/astro-ph/0111460v1
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78
Jul 20, 2013
07/13
by
V. A. Kudryavtsev
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The Boulby Dark Matter Collaboration (BDMC) is running several experiments for particle (WIMP) dark matter search in the Underground Boulby Laboratory. These include a liquid xenon detector (ZEPLIN I) and a low pressure gas TPC with directional sensitivity (DRIFT I). Next stage double-phase xenon detectors ZEPLIN II and ZEPLIN III, and a new TPC DRIFT II will be installed at Boulby in a few months. Recent results from the running experiments are discussed and future programme towards...
Source: http://arxiv.org/abs/astro-ph/0406126v1
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58
Sep 21, 2013
09/13
by
V. A. Kudryavtsev
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New string dynamics is formulated on the basis of the extended set of supergauge constraints including not only supergauge Virasoro conditions but also nilpotent supercurrent constraints . This approach arises from a natural generalization of the classical operator many-string vertices. The formulation of this model leads to three two-dimensional surfaces for description of hadron strings. It gives some dynamical generalization of Chan-Paton factor for string amplitudes in terms of operator...
Source: http://arxiv.org/abs/hep-th/9905041v1
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74
Jul 19, 2013
07/13
by
V. A. Kudryavtsev
texts
eye 74
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In the paper the nilpotent conditions of BRST operator for new superconformal string model were found. This string includes anticommutation $2-d$ fields additional to the standard Neveu-Schwarz superconformal set which carry quark quantum numbers. In this case the superconformal symmetry is realized by a non-linear way. In the superconformal composite string new constraints for 1 and 1/2 conformal dimension should be added to the standard system of Virasoro superalgebra constraints for 2 and...
Source: http://arxiv.org/abs/hep-th/9401142v1
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75
Sep 23, 2013
09/13
by
V. A. Kudryavtsev
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eye 75
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The paper describes two Monte Carlo codes dedicated to muon simulations: MUSIC (MUon SImulation Code) and MUSUN (MUon Simulations UNderground). MUSIC is a package for muon transport through matter. It is particularly useful for propagating muons through large thickness of rock or water, for instance from the surface down to underground/underwater laboratory. MUSUN is designed to use the results of muon transport through rock/water to generate muons in or around underground laboratory taking...
Source: http://arxiv.org/abs/0810.4635v1
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47
Sep 18, 2013
09/13
by
V. A. Kudryavtsev; G. Weidl
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eye 47
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We consider a critical composite superconformal string model to desribe hadronic interactions. We present a new approach of introducing hadronic quantum numbers in the scattering amplitudes. The physical states carry the quantum numbers and form a common system of eigenfunctions of the operators in this string model. We give explicit constructions of the quantum number operators.
Source: http://arxiv.org/abs/hep-th/9601008v1
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15
Jun 27, 2018
06/18
by
J. Klinger; V. A. Kudryavtsev
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We present an accurate model of the muon-induced background in the DAMA/LIBRA experiment. Our work challenges proposed mechanisms which seek to explain the observed DAMA signal modulation with muon-induced backgrounds. Muon generation and transport are performed using the MUSIC/MUSUN code, and subsequent interactions in the vicinity of the DAMA detector cavern are simulated with Geant4. We estimate the total muon-induced neutron flux in the detector cavern to be $\Phi_n^\nu = 1.0\times10^{-9}$...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1503.07225
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39
Sep 24, 2013
09/13
by
V. A. Kudryavtsev; A. N. Semenova
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Hadron amplitudes for interaction of pi and K nesons are constructed in composite superstring model
Source: http://arxiv.org/abs/1112.5021v1
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90
Jul 24, 2013
07/13
by
V. Tomasello; V. A. Kudryavtsev; M. Robinson
texts
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New generation dark matter experiments aim at exploring the 10e-9 - 10e-10 pb cross-section region for the WIMP-nucleon scalar interactions. Neutrons produced in the detector components are one of the main factors that can limit detector sensitivity. Estimation of the background from this source then becomes a crucial task for designing future large-scale detectors. Energy spectra and production rates for neutrons coming from radioactive contamination are required for all materials in and...
Source: http://arxiv.org/abs/0807.0851v1
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46
Sep 20, 2013
09/13
by
V. A. Kudryavtsev; L. Pandola; V. Tomasello
texts
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Background induced by neutrons in deep underground laboratories is a critical issue for all experiments looking for rare events, such as dark matter interactions or neutrinoless 2-beta decay. Neutrons can be produced either by natural radioactivity, via spontaneous fission or (alpha,n) reactions, or by interactions initiated by high-energy cosmic rays. In all underground experiments, Monte Carlo simulations of neutron background play a crucial role for the evaluation of the total background...
Source: http://arxiv.org/abs/0802.3566v1
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95
Sep 22, 2013
09/13
by
N. J. C. Spooner; V. A. Kudryavtsev
texts
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The current state searches for dark matter in the form of Weakly Interacting Massive Particles (WIMPs) using both direct and indirect techniques is reviewed. Advances in recent years by various direct search experiments, utilising technology able to record the nuclear recoil events expected from elastic scattering by WIMPs, have allowed progress towards lower limits to be made. In particular, the Edelweiss and CDMS collaborations are achieving sensitiviy able to challenge data from DAMA...
Source: http://arxiv.org/abs/astro-ph/0111053v1
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46
Sep 17, 2013
09/13
by
V. A. Kudryavtsev; M. Robinson; N. J. C. Spooner
texts
eye 46
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Detailed Monte Carlo simulations of the expected radioactive background rates and spectra in NaI crystals are presented. The obtained spectra are then compared to those measured in the DAMA/NaI and DAMA/LIBRA experiments. The simulations can be made consistent with the measured DAMA spectrum only by assuming higher than reported concentrations of some isotopes and even so leave very little room for the dark matter signal. We conclude that any interpretation of the annual modulation of the event...
Source: http://arxiv.org/abs/0912.2983v1
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70
Sep 23, 2013
09/13
by
A. Lindote; H. M. Araujo; V. A. Kudryavtsev; M. Robinson
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This article describes the Monte Carlo simulation used to interpret the measurement of the muon-induced neutron flux in the Boulby Underground Laboratory (North Yorkshire, UK), recently performed using a large scintillator veto deployed around the ZEPLIN-II WIMP detector. Version 8.2 of the GEANT4 toolkit was used after relevant benchmarking and validation of neutron production models. In the direct comparison between Monte Carlo and experimental data, we find that the simulation produces a 1.8...
Source: http://arxiv.org/abs/0810.1682v2
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62
Sep 19, 2013
09/13
by
V. A. Kudryavtsev; E. V. Korolkova; N. J. C. Spooner
texts
eye 62
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We revise the process of muon pair production by high-energy muons in rock using the recently published cross-section. The three-dimensional Monte Carlo code MUSIC has been used to obtain the characteristics of the muon bundles initiated via this process. We have compared them with those of conventional muon bundles initiated in the atmosphere and shown that large underground detectors, capable of collecting hundreds of thousands of multiple muon events, can discriminate statistically muon...
Source: http://arxiv.org/abs/hep-ph/9911493v1
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64
Sep 19, 2013
09/13
by
V. A. Kudryavtsev; N. J. C. Spooner; J. E. McMillan
texts
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The production of neutrons by cosmic-ray muons at large depths underground is discussed. The most recent versions of the muon propagation code MUSIC, and particle transport code FLUKA are used to evaluate muon and neutron fluxes. The results of simulations are compared with experimental data.
Source: http://arxiv.org/abs/hep-ex/0303007v1
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8.0
Jun 29, 2018
06/18
by
C. Zhang; D. -M. Mei; V. A. Kudryavtsev; S. Fiorucci
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We evaluate the cosmogenic production rates in some materials that are commonly used as targets and shielding/supporting components for detecting rare events. The results from Geant4 simulations are compared with the calculations of ACTIVIA and the available experimental data. We demonstrate that the production rates from the Geant4-based simulations agree with the available data reasonably well. As a result, we report that the cosmogenic production of several isotopes in various materials can...
Topics: High Energy Physics - Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1603.00098
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13
Jun 27, 2018
06/18
by
J. Klinger; V. A. Kudryavtsev; M. Richardson; N. J. C. Spooner
texts
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Large liquid argon TPC detector programs such as LBNE and LAGUNA-LBNO will be able to make measurements of the proton lifetime which will outperform Cherenkov detectors in the proton decay channel $p \rightarrow K^{+}\nu$. At the large depths which are proposed for such experiments, a non-negligible source of isolated charged kaons may be produced in the showers of cosmogenic muons. We present an estimate of the cosmogenic muon background to proton decay in the $p \rightarrow K^{+}\nu$ channel....
Topics: Instrumentation and Detectors, High Energy Physics - Experiment, Physics
Source: http://arxiv.org/abs/1504.06520
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41
Sep 21, 2013
09/13
by
P. Antonioli; C. Ghetti; E. V. Korolkova; V. A. Kudryavtsev; G. Sartorelli
texts
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We present a new three-dimensional Monte-Carlo code MUSIC (MUon SImulation Code) for muon propagation through the rock. All processes of muon interaction with matter with high energy loss (including the knock-on electron production) are treated as stochastic processes. The angular deviation and lateral displacement of muons due to multiple scattering, as well as bremsstrahlung, pair production and inelastic scattering are taken into account. The code has been applied to obtain the energy...
Source: http://arxiv.org/abs/hep-ph/9705408v2
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65
Sep 23, 2013
09/13
by
H. M. Araujo; V. A. Kudryavtsev; N. J. C. Spooner; T. J. Sumner
texts
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We report on a comparison study of the Monte Carlo packages GEANT4 and FLUKA for simulating neutron production by muons penetrating deep underground. GEANT4 is found to generate fewer neutrons at muon energies above ~100 GeV, by at most a factor of 2 in some materials, which we attribute mainly to lower neutron production in hadronic cascades. As a practical case study, the muon-induced neutron background expected in a 250 kg liquid-xenon WIMP dark matter detector was calculated and good...
Source: http://arxiv.org/abs/hep-ex/0411026v4
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107
Sep 18, 2013
09/13
by
H. Chagani; P. Majewski; E. J. Daw; V. A. Kudryavtsev; N. J. C. Spooner
texts
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We present preliminary results of measurements of the quenching factor for Na recoils in NaI(Tl) at room temperature, made at a dedicated neutron facility at the University of Sheffield. Measurements have been performed with a 2.45 MeV mono-energetic neutron generator in the energy range from 10 keV to 100 keV nuclear recoil energy. A BC501A liquid scintillator detector was used to tag neutrons. Cuts on pulse-shape discrimination from the BC501A liquid scintillator detector and neutron...
Source: http://arxiv.org/abs/physics/0611156v2
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74
Sep 18, 2013
09/13
by
H. Chagani; P. Majewski; E. J. Daw; V. A. Kudryavtsev; N. J. C. Spooner
texts
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Measurements of the quenching factor for sodium recoils in a 5 cm diameter NaI(Tl) crystal at room temperature have been made at a dedicated neutron facility at the University of Sheffield. The crystal has been exposed to 2.45 MeV mono-energetic neutrons generated by a Sodern GENIE 16 neutron generator, yielding nuclear recoils of energies between 10 and 100 keVnr. A cylindrical BC501A detector has been used to tag neutrons that scatter off sodium nuclei in the crystal. Cuts on pulse shape and...
Source: http://arxiv.org/abs/0806.1916v1
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57
Sep 20, 2013
09/13
by
R. Lemrani; M. Robinson; V. A. Kudryavtsev; M. De Jesus; G. Gerbier; N. J. C. Spooner
texts
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Simulations of neutron background from rock for underground experiments are presented. Neutron propagation through two types of rock, lead and hydrocarbon material is discussed. The results show a reasonably good agreement between GEANT4, MCNPX and GEANT3 in transporting low-energy neutrons.
Source: http://arxiv.org/abs/hep-ex/0601030v1
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53
Sep 19, 2013
09/13
by
V. A. Kudryavtsev; R. A. Brook; S. L. Cartwright; J. E. McMillan; N. J. C. Spooner; L. F. Thompson
texts
eye 53
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We propose to use stopping cosmic-ray muons in the energy calibration of planned and deployed large underwater detectors. The method is based on the proportionality between the incident muon energy and the length of the muon path before it stops. Simultaneous measurements of the muon path and the amplitude of the signal from the photomultiplier tubes allow a relation between the energy deposited in the sensitive volume of the detector and the observed signal to be derived, and also provide a...
Source: http://arxiv.org/abs/hep-ex/0010056v1
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62
Sep 20, 2013
09/13
by
E. Tziaferi; M. J. Carson; V. A. Kudryavtsev; R. Lerner; P. K. Lightfoot; S. M. Paling; M. Robinson; N. J. C. Spooner
texts
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A technique to measure low intensity fast neutron flux has been developed. The design, calibrations, procedure for data analysis and interpretation of the results are discussed in detail. The technique has been applied to measure the neutron background from rock at the Boulby Underground Laboratory, a site used for dark matter and other experiments, requiring shielding from cosmic ray muons. The experiment was performed using a liquid scintillation detector. A 6.1 litre volume stainless steel...
Source: http://arxiv.org/abs/hep-ex/0612014v1
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59
Sep 18, 2013
09/13
by
M. Robinson; V. A. Kudryavtsev; R. Luscher; J. E. McMillan; P. K. Lightfoot; N. J. C. Spooner; N. J. T. Smith; I. Liubarsky
texts
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Measurements of cosmic-ray muon rates and energy deposition spectra in a one tonne liquid scintillator detector at 1070 metres vertical depth in the Boulby underground laboratory are discussed. In addition, the simulations used to model the detector are described. The results of the simulations are compared to the experimental data and conclusions given. The muon flux in the laboratory is found to be (4.09+/-0.15)x10^-8 /cm^2/s.
Source: http://arxiv.org/abs/hep-ex/0306014v1
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46
Sep 20, 2013
09/13
by
V. A. Kudryavtsev; P. K. Lightfoot; J. E. McMillan; M. Robinson; N. J. C. Spooner; P. F. Smith; N. J. T. Smith; J. D. Lewin; R. Luscher; I. Liubarsky
texts
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The neutron background at the underground laboratory at Boulby - a site for several dark matter experiments - is discussed. Special emphasis is put on the neutron background produced by cosmic-ray muons. The most recent versions of the muon propagation code MUSIC, and particle transport code FLUKA are used to evaluate muon and neutron fluxes. The results of simulations are compared with experimental data.
Source: http://arxiv.org/abs/hep-ex/0301038v1
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50
Sep 21, 2013
09/13
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J. Cherwinka; R. Co; D. F. Cowen; D. Grant; F. Halzen; K. M. Heeger; L. Hsu; A. Karle; V. A. Kudryavtsev; R. Maruyama; W. Pettus; M. Robinson; N. J. C. Spooner
texts
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Astrophysical observations and cosmological data have led to the conclusion that nearly one quarter of the Universe consists of dark matter. Under certain assumptions, an observable signature of dark matter is the annual modulation of the rate of dark matter-nucleon interactions taking place in an Earth-bound experiment. To search for this effect, we introduce the concept for a new dark matter experiment using NaI scintillation detectors deployed deep in the South Pole ice. This experiment...
Source: http://arxiv.org/abs/1106.1156v1
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5.0
Jun 28, 2018
06/18
by
J. Klinger; S. J. Clark; M. Coleman; J. G. Gluyas; V. A. Kudryavtsev; D. L. Lincoln; S. Pal; S. M. Paling; N. J. C. Spooner; S. Telfer; L. F. Thompson; D. Woodward
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Current methods of monitoring subsurface CO$_2$, such as repeat seismic surveys, are episodic and require highly skilled personnel to acquire the data. Simulations based on simplified models have previously shown that muon radiography could be automated to continuously monitor CO$_2$ injection and migration, in addition to reducing the overall cost of monitoring. In this paper, we present a simulation of the monitoring of CO$_2$ plume evolution in a geological reservoir using muon radiography....
Topics: Physics, High Energy Physics - Experiment, Geophysics
Source: http://arxiv.org/abs/1510.06372
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62
Sep 18, 2013
09/13
by
V. A. Kudryavtsev; N. J. C. Spooner; D. R. Tovey; J. W. Roberts; M. J. Lehner; J. E. McMillan; P. K. Lightfoot; T. B. Lawson; C. D. Peak; R. Luscher; J. C. Barton
texts
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We report a study of CsI(Tl) scintillator to assess its applicability in experiments to search for dark matter particles. Measurements of the mean scintillation pulse shapes due to nuclear and electron recoils have been performed. We find that, as with NaI(Tl), pulse shape analysis can be used to discriminate between electron and nuclear recoils down to 4 keV. However, the discrimination factor is typically (10-15)% better than in NaI(Tl) above 4 keV. The quenching factor for caesium and iodine...
Source: http://arxiv.org/abs/hep-ex/0005031v1
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51
Sep 20, 2013
09/13
by
M. J. Carson; J. C. Davies; E. Daw; R. J. Hollingworth; V. A. Kudryavtsev; T. B. Lawson; P. K. Lightfoot; J. E. McMillan; B. Morgan; S. M. Paling; M. Robinson; N. J. C. Spooner; D. R. Tovey
texts
eye 51
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Simulations of the neutron background for future large-scale particle dark matter detectors are presented. Neutrons were generated in rock and detector elements via spontaneous fission and (alpha,n) reactions, and by cosmic-ray muons. The simulation techniques and results are discussed in the context of the expected sensitivity of a generic liquid xenon dark matter detector. Methods of neutron background suppression are investigated. A sensitivity of $10^{-9}-10^{-10}$ pb to WIMP-nucleon...
Source: http://arxiv.org/abs/hep-ex/0404042v1
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49
Jul 20, 2013
07/13
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V. A. Kudryavtsev; M. J. Lehner; C. D. Peak; T. B. Lawson; P. K. Lightfoot; J. E. McMillan; J. W. Roberts; N. J. C. Spooner; D. R. Tovey; C. K. Ward; P. F. Smith; N. J. T. Smith
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Measurements of the shapes of scintillation pulses produced by nuclear recoils, alpha particles and photons in NaI(Tl) crystals at visible energies of 10-100 keV have been performed in order to investigate possible sources of background in NaI(Tl) dark matter experiments and, in particular, the possible origin of the anomalous fast time constant events observed in the UK Dark Matter Collaboration experiments at Boulby mine. Pulses initiated by X-rays (via photoelectric effect close to the...
Source: http://arxiv.org/abs/hep-ex/9902032v2
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10.0
Jun 30, 2018
06/18
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DM-Ice Collaboration; :; J. Cherwinka; D. Grant; F. Halzen; K. M. Heeger; L. Hsu; A. J. F. Hubbard; A. Karle; M. Kauer; V. A. Kudryavtsev; C. Macdonald; R. H. Maruyama; S. Paling; W. Pettus; Z. P. Pierpoint; B. N. Reilly; M. Robinson; P. Sandstrom; N. J. C. Spooner; S. Telfer; L. Yang
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We report the first analysis of background data from DM-Ice17, a direct-detection dark matter experiment consisting of 17 kg of NaI(Tl) target material. It was codeployed with IceCube 2457 m deep in the South Pole glacial ice in December 2010 and is the first such detector operating in the Southern Hemisphere. The background rate in the 6.5 - 8.0 keVee region is measured to be 7.9 +/- 0.4 counts/day/keV/kg. This is consistent with the expected background from the detector assemblies with...
Topics: Physics, Astrophysics, High Energy Physics - Experiment, Cosmology and Nongalactic Astrophysics,...
Source: http://arxiv.org/abs/1401.4804
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65
Sep 23, 2013
09/13
by
S. Burgos; E. Daw; J. Forbes; C. Ghag; M. Gold; C. Hagemann; V. A. Kudryavtsev; T. B. Lawson; D. Loomba; P. Majewski; D. Muna; A. St. J. Murphy; S. M. Paling; A. Petkov; S. J. S. Plank; M. Robinson; N. Sanghi; D. P. Snowden-Ifft; N. J. C. Spooner; J. Turk; E. Tziaferi
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Understanding the ability to measure and discriminate particle events at the lowest possible energy is an essential requirement in developing new experiments to search for weakly interacting massive particle (WIMP) dark matter. In this paper we detail an assessment of the potential sensitivity below 10 keV in the 1 m^3 DRIFT-II directionally sensitive, low pressure, negative ion time projection chamber (NITPC), based on event-by-event track reconstruction and calorimetry in the multiwire...
Source: http://arxiv.org/abs/0903.0326v2
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15
Jun 28, 2018
06/18
by
DM-Ice Collaboration; :; J. Cherwinka; D. Grant; F. Halzen; K. M. Heeger; L. Hsu; A. J. F. Hubbard; A. Karle; M. Kauer; V. A. Kudryavtsev; K. E. Lim; C. Macdonald; R. H. Maruyama; S. Paling; W. Pettus; Z. P. Pierpoint; B. N. Reilly; M. Robinson; P. Sandstrom; N. J. C. Spooner; S. Telfer; L. Yang
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We report the measurement of muons and muon-induced phosphorescence in DM-Ice17, a NaI(Tl) direct detection dark matter experiment at the South Pole. Muon interactions in the crystal are identified by their observed pulse shape and large energy depositions. The measured muon rate in DM-Ice17 is 2.93 +/- 0.04 muons/crystal/day with a modulation amplitude of 12.3 +/- 1.7%, consistent with expectation. Following muon interactions, we observe long-lived phosphorescence in the NaI(Tl) crystals with...
Topics: Instrumentation and Detectors, Astrophysics, Physics, High Energy Physics - Experiment,...
Source: http://arxiv.org/abs/1509.02486
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49
Sep 18, 2013
09/13
by
S. Burgos; E. Daw; J. Forbes; C. Ghag; M. Gold; C. Hagemann; V. A. Kudryavtsev; T. B. Lawson; D. Loomba; P. Majewski; D. Muna; A. StJ. Murphy; G. G. Nicklin; S. M. Paling; A. Petkov; S. J. S. Plank; M. Robinson; N. Sanghi; D. P. Snowden-Ifft; N. J. C. Spooner; J. Turk; E. Tziaferi
texts
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We present first evidence for the so-called Head-Tail asymmetry signature of neutron-induced nuclear recoil tracks at energies down to 1.5 keV/amu using the 1m^3 DRIFT-IIc dark matter detector. This regime is appropriate for recoils induced by Weakly Interacting Massive Particle (WIMPs) but one where the differential ionization is poorly understood. We show that the distribution of recoil energies and directions induced here by Cf-252 neutrons matches well that expected from massive WIMPs. The...
Source: http://arxiv.org/abs/0809.1831v1
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54
Sep 22, 2013
09/13
by
D. Akimov; A. Bewick; D. Davidge; J. Dawson; A. S. Howard; I. Ivaniouchenkov; W. G. Jones; M. Joshi; V. A. Kudryavtsev; T. B. Lawson; V. Lebedenko; M. J. Lehner; P. K. Lightfoot; I. Liubarsky; R. Luscher; J. E. McMillan; C. D. Peak; J. J. Quenby; N. J. C. Spooner; T. J. Sumner; D. R. Tovey; C. K. Ward
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Results of observations of low energy nuclear and electron recoil events in liquid xenon scintillator detectors are given. The relative scintillation efficiency for nuclear recoils is 0.22 +/- 0.01 in the recoil energy range 40 keV - 70 keV. Under the assumption of a single dominant decay component to the scintillation pulse-shape the log-normal mean parameter T0 of the maximum likelihood estimator of the decay time constant for 6 keV < Eee < 30 keV nuclear recoil events is equal to 21.0...
Source: http://arxiv.org/abs/hep-ex/0106042v1
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57
Sep 18, 2013
09/13
by
S. Burgos; J. Forbes; C. Ghag; M. Gold; V. A. Kudryavtsev; T. B. Lawson; D. Loomba; P. Majewski; J. E. McMillan; D. Muna; A. StJ. Murphy; G. G. Nicklin; S. M. Paling; A. Petkov; S. J. S. Plank; M. Robinson; N. Sanghi; N. J. T. Smith; D. P. Snowden-Ifft; N. J. C. Spooner; T. J. Sumner; J. Turk; T. Tziaferi
texts
eye 57
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First results are presented from an analysis of data from the DRIFT-IIa and DRIFT-IIb directional dark matter detectors at Boulby Mine in which alpha particle tracks were reconstructed and used to characterise detector performance--an important step towards optimising directional technology. The drift velocity in DRIFT-IIa was [59.3 +/- 0.2 (stat) +/- 7.5 (sys)] m/s based on an analysis of naturally-occurring alpha-emitting background. The drift velocity in DRIFT-IIb was [57 +/- 1 (stat) +/- 3...
Source: http://arxiv.org/abs/0707.1758v1
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46
Sep 18, 2013
09/13
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R. Bisset; M. J. Carson; H. Chagani; D. B. Cline; E. J. Daw; T. Ferbel; J. Gao; Y. S. Gao; V. A. Kudryavtsev; P. K. Lightfoot; P. Majewski; J. Maxin; J. Miller; W. C. Ooi; M. Robinson; G. Salinas; U. Schroeder; J. Seifert; F. Sergiampietri; W. Skulski; P. F. Smith; N. J. C. Spooner; J. Toke; H. Wang; J. T. White; F. Wolfs; X. Yang
texts
eye 46
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We propose a new concept for a very low background multi-ton liquid xenon Dark Matter experiment. The detector consists of two concentric spheres and a charge readout device in the centre. Xenon between the two spheres forms a self-shield and veto device. The inner surface of the central sphere is coated with CsI to form an internal photocathode with minimum of 2\pi coverage for any event in the active volume. Photoelectrons from the CsI photocathode drift toward the charge readout...
Source: http://arxiv.org/abs/0705.2117v1
5
5.0
Jun 29, 2018
06/18
by
DM-Ice Collaboration; :; E. Barbosa de Souza; J. Cherwinka; A. Cole; A. C. Ezeribe; D. Grant; F. Halzen; K. M. Heeger; L. Hsu; A. J. F. Hubbard; J. H. Jo; A. Karle; M. Kauer; V. A. Kudryavtsev; K. E. Lim; C. Macdonald; R. H. Maruyama; F. Mouton; S. M. Paling; W. Pettus; Z. P. Pierpoint; B. N. Reilly; M. Robinson; F. R. Rogers; P. Sandstrom; A. Scarff; N. J. C. Spooner; S. Telfer; L. Yang
texts
eye 5
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We present the first search for a dark matter annual modulation signal in the Southern Hemisphere conducted with NaI(Tl) detectors, performed by the DM-Ice17 experiment. Nuclear recoils from dark matter interactions are expected to yield an annually modulated signal independent of location within the Earth's hemispheres. DM-Ice17, the first step in the DM-Ice experimental program, consists of 17 kg of NaI(Tl) located at the South Pole under 2200 m.w.e. overburden of Antarctic glacial ice. Taken...
Topics: Cosmology and Nongalactic Astrophysics, Instrumentation and Methods for Astrophysics, Physics,...
Source: http://arxiv.org/abs/1602.05939
43
43
Sep 22, 2013
09/13
by
H. M. Araujo; J. Blockley; C. Bungau; M. J. Carson; H. Chagani; E. Daw; B. Edwards; C. Ghag; E. V. Korolkova; V. A. Kudryavtsev; P. K. Lightfoot; A. Lindote; I. Liubarsky; R. Luscher; P. Majewski; K. Mavrokoridis; J. E. McMillan; A. St. J. Murphy; S. M. Paling; J. Pinto da Cunha; R. M. Preece; M. Robinson; N. J. T. Smith; P. F. Smith; N. J. C. Spooner; T. J. Sumner; R. J. Walker; H. Wang; J. White
texts
eye 43
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We present the first measurements of the muon-induced neutron flux at the Boulby Underground Laboratory. The experiment was carried out with an 0.73 tonne liquid scintillator that also served as an anticoincidence system for the ZEPLIN-II direct dark matter search. The experimental method exploited the delayed coincidences between high-energy muon signals and gamma-rays from radiative neutron capture on hydrogen or other elements. The muon-induced neutron rate, defined as the average number of...
Source: http://arxiv.org/abs/0805.3110v1
47
47
Sep 20, 2013
09/13
by
B. Ahmed; G. J. Alner; H. Araujo; J. C. Barton; A. Bewick; M. J. Carson; D. Davidge; J. V. Dawson; T. Gamble; S. P. Hart; R. Hollingworth; A. S. Howard; W. G. Jones; M. K. Joshi; V. A. Kudryavtsev; T. B. Lawson; V. Lebedenko; M. J. Lehner; J. D. Lewin; P. K. Lightfoot; I. Liubarsky; R. Luscher; J. E. McMillan; B. Morgan; G. Nicklin; S. M. Paling; R. M. Preece; J. J. Quenby; J. W. Roberts; M. Robinson; N. J. T. Smith; P. F. Smith; N. J. C. Spooner; T. J. Sumner; D. R. Tovey
texts
eye 47
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The NAIAD experiment (NaI Advanced Detector) for WIMP dark matter searches at Boulby mine (UK) is described. The detector consists of an array of encapsulated and unencapsulated NaI(Tl) crystals with high light yield. Six crystals are collecting data at present. Data accumulated by four of them (10.6 kg x year exposure) have been used to set upper limits on the WIMP-nucleon spin-independent and WIMP-proton spin-dependent cross-sections. Pulse shape analysis has been applied to discriminate...
Source: http://arxiv.org/abs/hep-ex/0301039v1
50
50
Sep 23, 2013
09/13
by
V. A. Kudryavtsev; N. J. C. Spooner; P. K. Lightfoot; J. W. Roberts; M. J. Lehner; T. Gamble; M. J. Carson; T. B. Lawson; R. Luscher; J. E. McMillan; B. Morgan; S. M. Paling; M. Robinson; D. R. Tovey; N. J. T. Smith; P. F. Smith; G. J. Alner; S. P. Hart; J. D. Lewin; R. M. Preece; T. J. Sumner; W. G. Jones; J. J. Quenby; B. Ahmed; A. Bewick; D. Davidge; J. V. Dawson; A. S. Howard; I. Ivaniouchenkov; M. K. Joshi; V. Lebedenko; I. Liubarsky; J. C. Barton; G. Gerbier; J. Mallet; L. Mosca; C. Tao
texts
eye 50
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The status of dark matter searches with inorganic scintillator detectors at Boulby mine is reviewed and the results of tests with a CsI(Tl) crystal are presented. The objectives of the latter experiment were to study anomalous fast events previously observed and to identify ways to remove this background. Clear indications were found that these events were due to surface contamination of crystals by alphas, probably from radon decay. A new array of unencapsulated NaI(Tl) crystals immersed...
Source: http://arxiv.org/abs/hep-ex/0109013v1
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41
Sep 22, 2013
09/13
by
L. Reichhart; A. Lindote; D. Yu. Akimov; H. M. Araujo; E. J. Barnes; V. A. Belov; A. Bewick; A. A. Burenkov; V. Chepel; A. Currie; L. DeViveiros; B. Edwards; V. Francis; C. Ghag; A. Hollingsworth; M. Horn; G. E. Kalmus; A. S. Kobyakin; A. G. Kovalenko; V. A. Kudryavtsev; V. N. Lebedenko; M. I. Lopes; R. Luscher; P. Majewski; A. St J. Murphy; F. Neves; S. M. Paling; J. Pinto da Cunha; R. Preece; J. J. Quenby; P. R. Scovell; C. Silva; V. N. Solovov; N. J. T. Smith; P. F. Smith; V. N. Stekhanov;...
texts
eye 41
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A measurement is presented of the neutron production rate in lead by high energy cosmic-ray muons at a depth of 2850 m water equivalent (w.e.) and a mean muon energy of 260 GeV. The measurement exploits the delayed coincidences between muons and the radiative capture of induced neutrons in a highly segmented tonne scale plastic scintillator detector. Detailed Monte Carlo simulations reproduce well the measured capture times and multiplicities and, within the dynamic range of the...
Source: http://arxiv.org/abs/1302.4275v1
4
4.0
Jun 29, 2018
06/18
by
The EDELWEISS Collaboration; Q. Arnaud; E. Armengaud; C. Augier; A. Benoît; L. Bergé; J. Billard; J. Blümer; T. de Boissière; A. Broniatowski; P. Camus; A. Cazes; M. Chapellier; F. Charlieux; L. Dumoulin; K. Eitel; N. Foerster; N. Fourches; J. Gascon; A. Giuliani; M. Gros; L. Hehn; G. Heuermann; M. De Jésus; Y. Jin; A. Juillard; M. Kleifges; V. Kozlov; H. Kraus; C. Kéfélian; V. A. Kudryavtsev; H. Le-Sueur; S. Marnieros; X. -F. Navick; C. Nones; E. Olivieri; P. Pari; B. Paul; M. -C. Piro;...
texts
eye 4
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The EDELWEISS-III direct dark matter search experiment uses cryogenic HP-Ge detectors Fully covered with Inter-Digitized electrodes (FID). They are operated at low fields ($
Topics: Astrophysics, Cosmology and Nongalactic Astrophysics, Instrumentation and Methods for Astrophysics,...
Source: http://arxiv.org/abs/1606.08097
6
6.0
Jun 29, 2018
06/18
by
The EDELWEISS Collaboration; E. Armengaud; Q. Arnaud; C. Augier; A. Benoît; L. Bergé; J. Billard; J. Blümer; T. de Boissière; A. Broniatowski; P. Camus; A. Cazes; M. Chapellier; F. Charlieux; M. De Jésus; L. Dumoulin; K. Eitel; N. Foerster; J. Gascon; A. Giuliani; M. Gros; L. Hehn; G. Heuermann; Y. Jin; A. Juillard; C. Kéfélian; M. Kleifges; V. Kozlov; H. Kraus; V. A. Kudryavtsev; H. Le-Sueur; S. Marnieros; X. -F. Navick; C. Nones; E. Olivieri; P. Pari; B. Paul; M. -C. Piro; D. Poda; E....
texts
eye 6
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We present a measurement of the cosmogenic activation in the germanium cryogenic detectors of the EDELWEISS III direct dark matter search experiment. The decay rates measured in detectors with different exposures to cosmic rays above ground are converted into production rates of different isotopes. The measured production rates in units of nuclei/kg/day are 82 $\pm$ 21 for $^3$H, 2.8 $\pm$ 0.6 for $^{49}$V, 4.6 $\pm$ 0.7 for $^{55}$Fe, and 106 $\pm$ 13 for $^{65}$Zn. These results are the most...
Topics: Nuclear Experiment, Cosmology and Nongalactic Astrophysics, Physics, Astrophysics, Instrumentation...
Source: http://arxiv.org/abs/1607.04560
12
12
Jun 29, 2018
06/18
by
EDELWEISS Collaboration; L. Hehn; E. Armengaud; Q. Arnaud; C. Augier; A. Benoît; L. Bergé; J. Billard; J. Blümer; T. de Boissière; A. Broniatowski; P. Camus; A. Cazes; M. Chapellier; F. Charlieux; M. De Jésus; L. Dumoulin; K. Eitel; N. Foerster; J. Gascon; A. Giuliani; M. Gros; G. Heuermann; Y. Jin; A. Juillard; C. Kéfélian; M. Kleifges; V. Kozlov; H. Kraus; V. A. Kudryavtsev; H. Le-Sueur; S. Marnieros; X. -F. Navick; C. Nones; E. Olivieri; P. Pari; B. Paul; M. -C. Piro; D. Poda; E....
texts
eye 12
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We report on a dark matter search for a Weakly Interacting Massive Particle (WIMP) in the mass range $m_\chi \in [4, 30]\,\mathrm{GeV}/c^2$ with the EDELWEISS-III experiment. A 2D profile likelihood analysis is performed on data from eight selected detectors with the lowest energy thresholds leading to a combined fiducial exposure of 496 kg-days. External backgrounds from $\gamma$- and $\beta$-radiation, recoils from $^{206}$Pb and neutrons as well as detector intrinsic backgrounds were...
Topics: Instrumentation and Detectors, Astrophysics, Cosmology and Nongalactic Astrophysics, Physics, High...
Source: http://arxiv.org/abs/1607.03367
