XMASS detector

Abe, K.; Hieda, Kotaro; Hiraide, K.; Hirano, Shingo; Kishimoto, Y.; Kobayashi, Kazuyoshi; Moriyama, S.; Nakagawa, K.; Nakahata, M.; Nishiie, H.; 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, Y. H.; Lee, K. B.; Lee, M. K.; Lee, J. S.; Fukuda, Y.; Itow, Y.; Nishitani, Y.; Masuda, K.; 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.nima.2013.03.059

Cited by 128 publications

(96 citation statements)

References 21 publications

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“…1. The site is part of the tunnel housing the KAGRA gravitational wave telescope (Somiya 2012) and is located below the cosmic-ray research facilities Super Kamiokande, KamLAND, CLIO, and XMASS (Fukuda et al 2003;Araki et al 2005;Miyoki et al 2006;Abe et al 2013). The measuring orientation of the strainmeter is N60°E, horizontal, and it is nearly parallel to the Atotsugawa fault, which is approximately 0.5 km from the instrument (Ohzono et al 2011).…”

Section: The 1500-m Laser Strainmetermentioning

confidence: 99%

Design and operation of a 1500-m laser strainmeter installed at an underground site in Kamioka, Japan

Araya

Takamori

Morii

et al. 2017

Earth Planets Space

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A laser strainmeter with a 1500-m baseline was constructed at an underground site in Kamioka, Gifu Prefecture, Japan, and has been operating since August 2016. The laser interferometer measures the change in distance between two retroreflectors housed in two vacuum chambers with a separation of 1500 m. The retroreflectors are fixed to the ground in the tunnel of the KAGRA gravitational wave telescope. A high-frequency-stabilized laser is used as a light source; it achieves an Allan variance of 3 × 10 −13. Since operations began, ground motions with large amplitude and timescale variations have been detected. The recorded tidal waveform almost agrees with the theoretical waveform; however, a slight difference of ~13% in amplitude is found, likely due to a topographic effect. The strain spectrum of the observed data for the 1500-m strainmeter indicates that the lowest background noise attained is less than 10 −12 in the mHz band. Seismic waves up to 6 × 10 −7 in amplitude have been observed without saturation or fringe steps. The strainmeter, with its excellent resolution, dynamic range, and bandwidth performance, provides a new method for observing low-frequency ground motion on seismic, geodetic, and intermediate timescales.

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Section: The 1500-m Laser Strainmetermentioning

confidence: 99%

Design and operation of a 1500-m laser strainmeter installed at an underground site in Kamioka, Japan

Araya

Takamori

Morii

et al. 2017

Earth Planets Space

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“…Direct detection of dark matter is one of the major scientific challenges in modern astroparticle physics. Based on the proposal [1], a single-phase liquid xenon (LXe) detector, XMASS-I was constructed [2]. Since the dark matter signal is expected to be rare, dark matter searches require low background detectors.…”

Section: Introductionmentioning

confidence: 99%

Development of low radioactivity photomultiplier tubes for the XMASS-I detector

Abe

Hiraide

Ichimura

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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XMASS-I is a single-phase liquid xenon detector whose purpose is direct de- tection of dark matter. To achieve the low background requirements necessary in the detector, a new model of photomultiplier tubes (PMTs), R10789, with a hexagonal window was developed based on the R8778 PMT used in the XMASS prototype detector. We screened the numerous component materials for their radioactivity. During development, the largest contributions to the reduction of radioactivity came from the stem and the dynode support. The glass stem was exchanged to the Kovar alloy one and the ceramic support were changed to the quartz one. R10789 is the first model of Hamamatsu Photonics K. K. that adopted these materials for low background purposes and provided a groundbreaking step for further reductions of radioactivity in PMTs. Measurements with germanium detectors showed 1.2±0.3 mBq/PMT of 226 Ra, less than 0.78 mBq/PMT of 228 Ra, 9.1±2.2 mBq/PMT of 40 K, and 2.8±0.2 mBq/PMT of 60 Co. In this paper, the radioactive details of the developed R10789 are described together with our screening methods and the components of the PMT.

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“…At present, the most favored nuclear targets include 19 F (SIMPLE [14], PICASSO [15]), 73 Ge (CDMS [16], EDELWEISS [17]) 127 I (KIMS [18], DAMA/LIBRA [19]), 129;131 Xe (XENON [20], XMASS [21], LZ [22]), and 133 Cs (KIMS). Aside from the above nuclei already used in detectors, there exist some other theoretically viable candidates [23], such as 83 Kr and 125 Te, which to our knowledge have not been examined thoroughly within a complete microscopic nuclear framework.…”

Section: Introductionmentioning

confidence: 99%

Shell-model study on event rates of lightest supersymmetric particles scattering offKr83andTe
Pirinen
¹
,
Srivastava
²
,
Suhonen
³

et al. 2016
Phys. Rev. D
13
2
13
0
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Shell-model study on event rates of lightest supersymmetric particles scattering off 83Kr and 125TePirinen, Pekka; Srivastava, P. C.; Suhonen, Jouni; Kortelainen, Markus Pirinen, P., Srivastava, P. C., Suhonen, J., & Kortelainen, M. (2016 We investigate the elastic and inelastic scattering of lightest supersymmetric particle (LSP) dark matter off two possible target nuclei, 83 Kr and 125 Te. For the nuclear-structure calculations, we employ the nuclear shell model using recently generated realistic interactions. We have condensed the nuclear-physics contribution to a set of nuclear-structure factors that are independent of the adopted supersymmetric (SUSY) model. Total event rates are then easily calculated by combining the nuclear-structure factors with SUSY parameters of choice. In particular, 125 Te shows promise as a detector material with both the elastic and inelastic channels yielding an appreciable nuclear response.

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XMASS detector

Cited by 128 publications

References 21 publications

Design and operation of a 1500-m laser strainmeter installed at an underground site in Kamioka, Japan

Design and operation of a 1500-m laser strainmeter installed at an underground site in Kamioka, Japan

Development of low radioactivity photomultiplier tubes for the XMASS-I detector

Shell-model study on event rates of lightest supersymmetric particles scattering offKr83andTe
Pirinen
¹
,
Srivastava
²
,
Suhonen
³

et al. 2016
Phys. Rev. D
13
2
13
0
View full text Add to dashboard Cite

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XMASS detector

Cited by 128 publications

References 21 publications

Design and operation of a 1500-m laser strainmeter installed at an underground site in Kamioka, Japan

Design and operation of a 1500-m laser strainmeter installed at an underground site in Kamioka, Japan

Development of low radioactivity photomultiplier tubes for the XMASS-I detector

Shell-model study on event rates of lightest supersymmetric particles scattering offKr83andTePirinen1, Srivastava2, Suhonen3 et al. 2016Phys. Rev. D132130View full textAdd to dashboardCite

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Shell-model study on event rates of lightest supersymmetric particles scattering offKr83andTe
Pirinen
¹
,
Srivastava
²
,
Suhonen
³

et al. 2016
Phys. Rev. D
13
2
13
0
View full text Add to dashboard Cite