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63 63

Improved Spin-Dependent WIMP Limits from a Bubble Chamber

Jul 20, 2013 07/13

by E. Behnke; J. I. Collar; P. S. Cooper; K. Crum; M. Crisler; M. Hu; I. Levine; D. Nakazawa; H. Nguyen; B. Odom; E. Ramberg; J. Rasmussen; N. Riley; A. Sonnenschein; M. Szydagis; R. Tschirhart

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Bubble Chambers provided the dominant particle detection technology in accelerator experiments for several decades, eventually falling into disuse with the advent of other techniques. We report here on the first period of operation of an ultra-clean, room-temperature bubble chamber containing 1.5 kg of superheated CF$_{3}$I, a target maximally sensitive to spin-dependent and -independent Weakly Interacting Massive Particle (WIMP) couplings. An exposure in excess of 250 kg-days is obtained, with...
Source: http://arxiv.org/abs/0804.2886v1

Arxiv.org

41 41

Improved Limits on Spin-Dependent WIMP-Proton Interactions from a Two Liter CF$_3$I Bubble Chamber

Sep 21, 2013 09/13

by E. Behnke; J. Behnke; S. J. Brice; D. Broemmelsiek; J. I. Collar; P. S. Cooper; M. Crisler; C. E. Dahl; D. Fustin; J. Hall; J. H. Hinnefeld; M. Hu; I. Levine; E. Ramberg; T. Shepherd; A. Sonnenschein; M. Szydagis

eye 41

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Data from the operation of a bubble chamber filled with 3.5 kg of CF$_{3}$I in a shallow underground site are reported. An analysis of ultrasound signals accompanying bubble nucleations confirms that alpha decays generate a significantly louder acoustic emission than single nuclear recoils, leading to an efficient background discrimination. Three dark matter candidate events were observed during an effective exposure of 28.1 kg-day, consistent with a neutron background. This observation...
Source: http://arxiv.org/abs/1008.3518v2

Arxiv.org

71 71

First dark matter search results from a 4-kg CF$_3$I bubble chamber operated in a deep underground site

Sep 21, 2013 09/13

by E. Behnke; J. Behnke; S. J. Brice; D. Broemmelsiek; J. I. Collar; A. Conner; P. S. Cooper; M. Crisler; C. E. Dahl; D. Fustin; E. Grace; J. Hall; M. Hu; I. Levine; W. H. Lippincott; T. Moan; T. Nania; E. Ramberg; A. E. Robinson; A. Sonnenschein; M. Szydagis; E. Vázquez-Jáuregui

eye 71

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New data are reported from the operation of a 4.0 kg CF$_{3}$I bubble chamber in the 6800-foot-deep SNOLAB underground laboratory. The effectiveness of ultrasound analysis in discriminating alpha-decay background events from single nuclear recoils has been confirmed, with a lower bound of $>$99.3% rejection of alpha-decay events. Twenty single nuclear recoil event candidates and three multiple bubble events were observed during a total exposure of 553 kg-days distributed over three different...
Source: http://arxiv.org/abs/1204.3094v2

Arxiv.org

55 55

Characterization of the Response of Superheated Droplet (Bubble) Detectors

Sep 21, 2013 09/13

by The PICASSO Collaboration; M. Barnabe-Heider; E. Behnke; J. Behnke; M. Di Marco; P. Doane; W. Feighery; M-H. Genest; R. Gornea; S. Kanagalingam; C. Leroy; L. Lessard; I. Levine; J. P. Martin; C. Mathusi; J. Neurenberg; A. J. Noble; R. Noulty; R. Nymberg; S. N. Shore; U. Wichoski; V. Zacek

eye 55

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The PICASSO project is a cold dark matter (CDM) search experiment relying on the superheated droplet technique. The detectors use superheated freon liquid droplets (active material) dispersed and trapped in a polymerized gel. This detection technique is based on the phase transition of superheated droplets at room or moderate temperatures. The phase transitions are induced by nuclear recoils when undergoing interactions with particles, including CDM candidates such as the neutralinos predicted...
Source: http://arxiv.org/abs/hep-ex/0311034v1

Arxiv.org

53 53

Status of the PICASSO Project

Sep 23, 2013 09/13

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The Picasso project is a dark matter search experiment based on the superheated droplet technique. Preliminary runs performed at the Picasso Lab in Montreal have showed the suitability of this detection technique to the search for weakly interacting cold dark matter particles. In July 2002, a new phase of the project started. A batch of six 1-liter detectors with an active mass of approximately 40g was installed in a gallery of the SNO observatory in Sudbury, Ontario, Canada at a depth of 6,800...
Source: http://arxiv.org/abs/hep-ex/0312049v1

Arxiv.org

143 143

Direct Measurement of the Bubble Nucleation Energy Threshold in a CF3I Bubble Chamber

Jul 20, 2013 07/13

by COUPP Collaboration; E. Behnke; T. Benjamin; S. J. Brice; D. Broemmelsiek; J. I. Collar; P. S. Cooper; M. Crisler; C. E. Dahl; D. Fustin; J. Hall; C. Harnish; I. Levine; W. H. Lippincott; T. Moan; T. Nania; R. Neilson; E. Ramberg; A. E. Robinson; A. Sonnenschein; E. Vázquez-Jáuregui; R. A. Rivera; L. Uplegger

eye 143

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We have directly measured the energy threshold and efficiency for bubble nucleation from iodine recoils in a CF3I bubble chamber in the energy range of interest for a dark matter search. These interactions cannot be probed by standard neutron calibration methods, so we develop a new technique by observing the elastic scattering of 12 GeV/c negative pions. The pions are tracked with a silicon pixel telescope and the reconstructed scattering angle provides a measure of the nuclear recoil kinetic...
Source: http://arxiv.org/abs/1304.6001v1

Arxiv.org

113 113

Discrimination of nuclear recoils from alpha particles with superheated liquids

Sep 17, 2013 09/13

by F. Aubin; M. Auger; E. Behnke; B. Beltran; K. Clark; X. Dai; A. Davour; M. -H. Genest; G. Giroux; R. Gornea; R. Faust; C. B. Krauss; C. Leroy; L. Lessard; I. Levine; C. Levy; J. -P. Martin; T. Morlat; A. J. Noble; P. Nadeau; M. -C. Piro; S. Pospisil; T. Shepherd; J. Sodomka; N. Starinski; I. Stekl; C. Storey; U. Wichoski; V. Zacek

eye 113

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The PICASSO collaboration observed for the first time a significant difference between the acoustic signals induced by neutrons and alpha particles in a detector based on superheated liquids. This new discovery offers the possibility of improved background suppression and could be especially useful for dark matter experiments. This new effect may be attributed to the formation of multiple bubbles on alpha tracks, compared to single nucleations created by neutron induced recoils.
Source: http://arxiv.org/abs/0807.1536v2

Arxiv.org

6 6.0

Final Results of the PICASSO Dark Matter Search Experiment

Jun 29, 2018 06/18

by E. Behnke; M. Besnier; P. Bhattacharjee; X. Dai; M. Das; A. Davour; F. Debris; N. Dhungana; J. Farine; M. Fines-Neuschild; S. Gagnebin; G. Giroux; E. Grace; C. M. Jackson; A. Kamaha; C. B. Krauss; M. Lafrenière; M. Laurin; I. Lawson; L. Lessard; I. Levine; D. Marlisov; J. -P. Martin; P. Mitra; A. J. Noble; A. Plante; R. Podviyanuk; S. Pospisil; O. Scallon; S. Seth; N. Starinski; I. Stekl; U. Wichoski; V. Zacek

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The PICASSO dark matter search experiment operated an array of 32 superheated droplet detectors containing 3.0 kg of C$_{4}$F$_{10}$ and collected an exposure of 231.4 kgd at SNOLAB between March 2012 and January 2014. We report on the final results of this experiment which includes for the first time the complete data set and improved analysis techniques including \mbox{acoustic} localization to allow fiducialization and removal of higher activity regions within the detectors. No signal...
Topics: Instrumentation and Detectors, Astrophysics, Cosmology and Nongalactic Astrophysics, Physics, High...
Source: http://arxiv.org/abs/1611.01499

Arxiv.org

52 52

New Insights into Particle Detection with Superheated Liquids

Sep 21, 2013 09/13

by S. Archambault; F. Aubin; M. Auger; M. Beleshi; E. Behnke; J. Behnke; B. Beltran; K. Clark; X. Dai; A. Davour; F. Debris. J. Farine; M. -H. Genest; G. Giroux; R. Gornea; R. Faust; H. Hinnefeld; A. Kamaha; C. B. Krauss; M. Lafrenière; M. Laurin; I. Lawson; C. Leroy; C. Lévy; L. Lessard; I. Levine; J. -P. Martin; S. Kumaratunga; R. MacDonald; R. Nadeau; A. Noble; M. -C. Piro; S. Pospisil; N. Starinski; I. Stekl; N. Vander Werf; U. Wichoski; V. Zacek

eye 52

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We report new results obtained in calibrations of superheated liquid droplet detectors used in dark matter searches with different radiation sources (n,$\alpha$,$\gamma$). In particular, detectors were spiked with alpha-emitters located inside and outside the droplets. It is shown that the responses are different, depending on whether alpha particles or recoil nuclei create the signals. The energy thresholds for $\alpha$-emitters are compared with test beam measurements using mono-energetic...
Source: http://arxiv.org/abs/1011.4553v1

Arxiv.org

70 70

Constraints on Low-Mass WIMP Interactions on 19F from PICASSO

Sep 23, 2013 09/13

by The PICASSO Collaboration; S. Archambault; E. Behnke; P. Bhattacharjee; S. Bhattacharya; X. Dai; M. Das; A. Davour; F. Debris; N. Dhungana; J. Farine; S. Gagnebin; G. Giroux; E. Grace; C. M. Jackson; A. Kamaha; C. Krauss; S. Kumaratunga; M. Lafrenière; M. Laurin; I. Lawson; L. Lessard; I. Levine; C. Levy; R. P. MacDonald; D. Marlisov; J. -P. Martin; P. Mitra; A. J. Noble; M. -C. Piro; R. Podviyanuk; S. Pospisil; S. Saha; O. Scallon; S. Seth; N. Starinski; I. Stekl; U. Wichoski; T. Xie; V. Zacek

eye 70

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Recent results from the PICASSO dark matter search experiment at SNOLAB are reported. These results were obtained using a subset of 10 detectors with a total target mass of 0.72 kg of 19F and an exposure of 114 kgd. The low backgrounds in PICASSO allow recoil energy thresholds as low as 1.7 keV to be obtained which results in an increased sensitivity to interactions from Weakly Interacting Massive Particles (WIMPs) with masses below 10 GeV/c^2. No dark matter signal was found. Best exclusion...
Source: http://arxiv.org/abs/1202.1240v2

Arxiv.org

4 4.0

Dark Matter Search Results from the PICO-60 CF$_3$I Bubble Chamber

Jun 28, 2018 06/18

by C. Amole; M. Ardid; D. M. Asner; D. Baxter; E. Behnke; P. Bhattacharjee; H. Borsodi; M. Bou-Cabo; S. J. Brice; D. Broemmelsiek; K. Clark; J. I. Collar; P. S. Cooper; M. Crisler; C. E. Dahl; S. Daley; M. Das; F. Debris; N. Dhungana; J. Farine; I. Felis; R. Filgas; F. Girard; G. Giroux; A. Grandison; M. Hai; J. Hall; O. Harris; M. Jin; C. B. Krauss; S. Fallows; M. Lafrenière; M. Laurin; I. Lawson; I. Levine; W. H. Lippincott; E. Mann; D. Maurya; P. Mitra; R. Neilson; A. J. Noble; A. Plante; R....

eye 4

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New data are reported from the operation of the PICO-60 dark matter detector, a bubble chamber filled with 36.8 kg of CF$_3$I and located in the SNOLAB underground laboratory. PICO-60 is the largest bubble chamber to search for dark matter to date. With an analyzed exposure of 92.8 livedays, PICO-60 exhibits the same excellent background rejection observed in smaller bubble chambers. Alpha decays in PICO-60 exhibit frequency-dependent acoustic calorimetry, similar but not identical to that...
Topics: High Energy Physics - Experiment, Cosmology and Nongalactic Astrophysics, Astrophysics,...
Source: http://arxiv.org/abs/1510.07754

Arxiv.org

22 22

Dark Matter Search Results from the PICO-2L C$_3$F$_8$ Bubble Chamber

Jun 27, 2018 06/18

by C. Amole; M. Ardid; D. M. Asner; D. Baxter; E. Behnke; P. Bhattacharjee; H. Borsodi; M. Bou-Cabo; S. J. Brice; D. Broemmelsiek; K. Clark; J. I. Collar; P. S. Cooper; M. Crisler; C. E. Dahl; S. Daley; M. Das; F. Debris; N. Dhungana; J. Farine; I. Felis; R. Filgas; M. Fines-Neuschild; F. Girard; G. Giroux; M. Hai; J. Hall; O. Harris; C. M. Jackson; M. Jin; C. B. Krauss; M. Lafrenière; M. Laurin; I. Lawson; I. Levine; W. H. Lippincott; E. Mann; J. P. Martin; D. Maurya; P. Mitra; R. Neilson; A. J....

eye 22

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New data are reported from the operation of a 2-liter C$_3$F$_8$ bubble chamber in the 2100 meter deep SNOLAB underground laboratory, with a total exposure of 211.5 kg-days at four different recoil energy thresholds ranging from 3.2 keV to 8.1 keV. These data show that C3F8 provides excellent electron recoil and alpha rejection capabilities at very low thresholds, including the first observation of a dependence of acoustic signal on alpha energy. Twelve single nuclear recoil event candidates...
Topics: Instrumentation and Detectors, Astrophysics, Physics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1503.00008

Arxiv.org

5 5.0

Improved dark matter search results from PICO-2L Run 2

Jun 29, 2018 06/18

by C. Amole; M. Ardid; I. J. Arnquist; D. M. Asner; D. Baxter; E. Behnke; P. Bhattacharjee; H. Borsodi; M. Bou-Cabo; S. J. Brice; D. Broemmelsiek; K. Clark; J. I. Collar; P. S. Cooper; M. Crisler; C. E. Dahl; M. Das; F. Debris; S. Fallows; J. Farine; I. Felis; R. Filgas; M. Fines-Neuschild; F. Girard; G. Giroux; J. Hall; O. Harris; E. W. Hoppe; C. M. Jackson; M. Jin; C. B. Krauss; M. Lafrenière; M. Laurin; I. Lawson; A. Leblanc; I. Levine; W. H. Lippincott; E. Mann; J. P. Martin; D. Maurya; P....

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New data are reported from a second run of the 2-liter PICO-2L C$_3$F$_8$ bubble chamber with a total exposure of 129$\,$kg-days at a thermodynamic threshold energy of 3.3$\,$keV. These data show that measures taken to control particulate contamination in the superheated fluid resulted in the absence of the anomalous background events observed in the first run of this bubble chamber. One single nuclear-recoil event was observed in the data, consistent both with the predicted background rate...
Topics: Astrophysics, Cosmology and Nongalactic Astrophysics, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1601.03729

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