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

Publikováno v: Nuclear Inst. and Methods in Physics Research Section A, 922 (2019) 171-176

XMASS-I is a single-phase liquid xenon detector whose purpose is direct detection 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 d

Externí odkaz: http://arxiv.org/abs/1808.03617

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A direct dark matter search in XMASS-I

Publikováno v: Physics Letters B 789 (2019) 45-53

A search for dark matter using an underground single-phase liquid xenon detector was conducted at the Kamioka Observatory in Japan, particularly for Weakly Interacting Massive Particles (WIMPs). We have used 705.9 live days of data in a fiducial volu

Externí odkaz: http://arxiv.org/abs/1804.02180

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Direct dark matter search by annual modulation with 2.7 years of XMASS-I data

Publikováno v: Phys. Rev. D 97, 102006 (2018)

An annual modulation signal due to the Earth orbiting around the Sun would be one of the strongest indications of the direct detection of dark matter. In 2016, we reported a search for dark matter by looking for this annual modulation with our single

Externí odkaz: http://arxiv.org/abs/1801.10096

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Improved search for two-neutrino double electron capture on $^{124}$Xe and $^{126}$Xe using particle identification in XMASS-I

Publikováno v: PTEP 2018 (2018) 053D03

We conducted an improved search for the simultaneous capture of two $K$-shell electrons on the $^{124}$Xe and $^{126}$Xe nuclei with emission of two neutrinos using 800.0 days of data from the XMASS-I detector. A novel method to discriminate $\gamma$

Externí odkaz: http://arxiv.org/abs/1801.03251

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Identification of $^{210}$Pb and $^{210}$Po in the bulk of copper samples with a low-background alpha particle counter

Publikováno v: Nuclear Inst. and Methods in Physics Research, A884 (2018) 157-161

We established a method to assay $^{210}$Pb and $^{210}$Po contaminations in the bulk of copper samples using a low-background alpha particle counter. The achieved sensitivity for the $^{210}$Pb and $^{210}$Po contaminations reaches a few mBq/kg. Due

Externí odkaz: http://arxiv.org/abs/1707.06413

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Search for solar Kaluza-Klein axion by annual modulation with the XMASS-I detector

In theories with the large extra dimensions beyond the standard 4-dimensional spacetime, axions could propagate in such extra dimensions, and acquire Kaluza-Klein (KK) excitations. These KK axions are produced in the Sun and could solve unexplained h

Externí odkaz: http://arxiv.org/abs/1707.08995

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A measurement of the time profile of scintillation induced by low energy gamma-rays in liquid xenon with the XMASS-I detector

Publikováno v: Nucl. Instrum. Meth. A 834 (2016) 192-196

We report the measurement of the emission time profile of scintillation from gamma-ray induced events in the XMASS-I 832 kg liquid xenon scintillation detector. Decay time constant was derived from a comparison of scintillation photon timing distribu

Externí odkaz: http://arxiv.org/abs/1604.01503

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Direct dark matter search by annual modulation in XMASS-I

A search for dark matter was conducted by looking for an annual modulation signal due to the Earth's rotation around the Sun using XMASS, a single phase liquid xenon detector. The data used for this analysis was 359.2 live days times 832 kg of exposu

Externí odkaz: http://arxiv.org/abs/1511.04807

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Search for two-neutrino double electron capture on $^{124}$Xe with the XMASS-I detector

Publikováno v: Phys. Lett. B 759 (2016) 64-68

Double electron capture is a rare nuclear decay process in which two orbital electrons are captured simultaneously in the same nucleus. Measurement of its two-neutrino mode would provide a new reference for the calculation of nuclear matrix elements

Externí odkaz: http://arxiv.org/abs/1510.00754

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