Light WIMP search in XMASS

Abe, K.; Hieda, Kotaro; Hiraide, K.; Hirano, Shingo; Kishimoto, Y.; Kobayashi, Kazuyoshi; Moriyama, S.; Nakagawa, K.; Nakahata, M.; Ogawa, Hiroshi; Oka, Naoki; Sekiya, H.; Shinozaki, Ayako; Suzuki, Y.; Takeda, Atsushi; Takachio, O.; Ueshima, K.; Umemoto, D.; Yamashita, M.; Yang, B. S.; Tasaka, S.; Liu, J.; Martens, K.; Hosokawa, K.; Miuchi, K.; Murata, Akiko; Onishi, Yoshiaki; Otsuka, Yasuyuki; Takeuchi, Y.; Kim, Yoon Hak; Lee, K.B.; Lee, M.K.; Lee, J.S.; Fukuda, Y.; Itow, Y.; Masuda, K.; Nishitani, Y.; Takiya, H.; Uchida, Hirohisa; Kim, N.Y.; Kim, Y.D.; Kusaba, F.; Motoki, D.; Nishijima, K.; Fujii, Keiko; Murayama, I.; Nakamura, Shōgo

doi:10.1016/j.physletb.2013.01.001

Cited by 51 publications

(40 citation statements)

References 17 publications

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“…Multiple groups have studied liquid xenon PSD in small R&D detectors [10,13,14], and it was successfully used to reduce backgrounds in early liquid-xenon-based dark matter searches [15][16][17][18]. However, these studies are restricted to small detectors or detectors with spherical photosensor coverage of the xenon volume.…”

Section: Introductionmentioning

confidence: 99%

Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector

Akerib¹,

Alsum²,

Araújo³

et al. 2018

Phys. Rev. D

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Weakly interacting massive particles (WIMPs) are a leading candidate for dark matter and are expected to produce nuclear recoil (NR) events within liquid xenon time-projection chambers. We present a measurement of the scintillation timing characteristics of liquid xenon in the LUX dark matter detector and develop a pulse shape discriminant to be used for particle identification. To accurately measure the timing characteristics, we develop a template-fitting method to reconstruct the detection times of photons. Analyzing calibration data collected during the 2013-2016 LUX WIMP search, we provide a new measurement of the singlet-to-triplet scintillation ratio for electron recoils (ER) below 46 keV, and we make, to our knowledge, a first-ever measurement of the NR singlet-to-triplet ratio at recoil energies below 74 keV. We exploit the difference of the photon time spectra for NR and ER events by using a prompt fraction discrimination parameter, which is optimized using calibration data to have the least number of ER events that occur in a 50% NR acceptance region. We then demonstrate how this discriminant can be used in conjunction with the charge-to-light discrimination to possibly improve the signal-to-noise ratio for nuclear recoils.

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Section: Introductionmentioning

confidence: 99%

Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector

Akerib¹,

Alsum²,

Araújo³

et al. 2018

Phys. Rev. D

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“…Photomultiplier tubes (PMTs) were shown to cause a major contribution to the electronic recoil background from detector materials in the XENON100 [10] and LUX [12] experiments. Other current and planned experiments based on xenon as a detection medium for rare-event searches are XMASS [13], PandaX [14], LZ [15], DAR-WIN [16][17][18], NEXT [19] and EXO [20].…”

Section: Introductionmentioning

confidence: 99%

Lowering the radioactivity of the photomultiplier tubes for the XENON1T dark matter experiment

Aprile¹,

Agostini²,

Alfonsi³

et al. 2015

Eur. Phys. J. C

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The low-background, VUV-sensitive 3-inch diameter photomultiplier tube R11410 has been developed by Hamamatsu for dark matter direct detection experiments using liquid xenon as the target material. We present the results from the joint effort between the XENON collaboration and the Hamamatsu company to produce a highly radiopure photosensor (version R11410-21) for the XENON1T dark matter experiment. After introducing the photosensor and its components, we show the methods and results of the radioactive contamination measurements of the individual 123 546 Page 2 of 10 Eur. Phys. J. C (2015) 75 :546 materials employed in the photomultiplier production. We then discuss the adopted strategies to reduce the radioactivity of the various PMT versions. Finally, we detail the results from screening 286 tubes with ultra-low background germanium detectors, as well as their implications for the expected electronic and nuclear recoil background of the XENON1T experiment.

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“…The detector consists of two components, the inner and outer detectors (ID and OD, respectively). The ID is equipped with 642 inward-facing photomultiplier tubes [4,5,6,7] thanks to the high light yield and low background. In the commissioning run, we found major background coming from the PMT part.…”

Section: Xmass Projectmentioning

confidence: 99%

Direct dark matter search with XMASS: modulation analysis

Kobayashi

2016

J. Phys.: Conf. Ser.

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Abstract. Dark matter search by means of the annual modulation was done using large singlephase liquid-xenon detector, XMASS. With the data from November-2013 to March-2015, model independent analysis showed a weak modulation effect, however, the result can be explained by a fluctuation of the background at the level of 7-17%. If we assume the standard weekly interacting massive particles dark matter, we exclude almost all the allowed region claimed by the DAMA/LIBRA experiment. This is the first extensive search over their allowed region exploiting the annual modulation with high statistics data.

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Light WIMP search in XMASS

Cited by 51 publications

References 17 publications

Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector

Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector

Lowering the radioactivity of the photomultiplier tubes for the XENON1T dark matter experiment

Direct dark matter search with XMASS: modulation analysis

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