68
68
Sep 24, 2013
09/13
by
M. Torikai; M. Yamashita
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eye 68
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The McMillan liquid crystalline models under the influence of homeotropic anchoring walls and of external fields are investigated. For thin systems, the existence of the critical thickness, below which the system does not undergo a discrete phase transition, is confirmed. Apparent differences between the influence of the anchoring walls and of external fields are elucidated by investigating the order parameters and a temperature vs external field phase diagram for the bulk systems.
Source: http://arxiv.org/abs/cond-mat/0412219v1
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4.0
Jun 29, 2018
06/18
by
M. Kobayashi; M. Yamashita; A. Takeda; K. Kishimoto; S. Moriyama
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eye 4
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In this paper, we describe 220Rn calibration source that was developed for liquid noble gas detectors. The key advantage of this source is that it can provide 212Bi-212Po consecutive events, which enables us to evaluate the vertex resolution of a detector at low energy by comparing low-energy events of 212Bi and corresponding higher-energy alpha-rays from 212Po. Since 220Rn is a noble gas, a hot metal getter can be used when introduced using xenon as the carrier gas. In addition, no long-life...
Topics: Nuclear Experiment, Cosmology and Nongalactic Astrophysics, Physics, Astrophysics, Instrumentation...
Source: http://arxiv.org/abs/1603.02904
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72
Sep 18, 2013
09/13
by
E. Aprile; K. L. Giboni; P. Majewski; K. Ni; M. Yamashita
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eye 72
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A strong anti-correlation between ionization and scintillation signals produced by MeV gamma-rays in liquid xenon has been measured and used to improve the energy resolution by combining the two signals. The improvement is explained by reduced electron-ion recombination fluctuations of the combined signal compared to fluctuations of the individual signals. Simultaneous measurements of ionization and scintillation signals were carried out with Cs-137, Na-22 and Co-60 gamma rays, as a function of...
Source: http://arxiv.org/abs/0704.1118v1
90
90
Sep 20, 2013
09/13
by
K. Ni; E. Aprile; K. L. Giboni; P. Majewski; M. Yamashita
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eye 90
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Scintillation light from gamma ray irradiation in liquid xenon is detected by two Hamamatsu R9288 photomultiplier tubes (PMTs) immersed in the liquid. UV light reflector material, PTFE, is used to optimize the light collection efficiency. The detector gives a high light yield of 6 photoelectron per keV (pe/keV), which allows efficient detection of the 122 keV gamma-ray line from Co-57, with a measured energy resolution of (8.8+/-0.6)% (sigma). The best achievable energy resolution, by removing...
Source: http://arxiv.org/abs/physics/0608034v2
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52
Sep 18, 2013
09/13
by
K. Ni; E. Aprile; D. Day; K. L. Giboni; J. A. M. Lopes; P. Majewski; M. Yamashita
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eye 52
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Scintillation light produced in liquid xenon (LXe) by alpha particles, electrons and gamma-rays was detected with a large area avalanche photodiode (LAAPD) immersed in the liquid. The alpha scintillation yield was measured as a function of applied electric field. We estimate the quantum efficiency of the LAAPD to be 45%. The best energy resolution from the light measurement at zero electric field is 7.5%(sigma) for 976 keV internal conversion electrons from Bi-207 and 2.6%(sigma) for 5.5 MeV...
Source: http://arxiv.org/abs/physics/0502071v1
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46
Sep 22, 2013
09/13
by
M. Yamashita; N. Nakata; Y. Senshu; S. Tonegawa; K. Ikada; K. Hashimoto; H. Sugawara; T. Shibauchi; Y. Matsuda
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eye 46
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The superconducting gap structure of LaFePO ($T_c=7.4 $K) is studied by thermal conductivity ($\kappa$) at low temperatures in fields $H$ parallel and perpendicular to the c axis. A clear two-step field dependence of $\kappa(H)$ with a characteristic field $H_s(\sim 350$ Oe) much lower than the upper critical field $H_{c2}$ is observed. In spite of large anisotropy of $H_{c2}$, $\kappa(H)$ in both $H$-directions is nearly identical below $H_s$. Above $H_s$, $\kappa(H)$ grows gradually with $H$...
Source: http://arxiv.org/abs/0906.0622v1
101
101
Jul 20, 2013
07/13
by
K. Hashimoto; S. Kasahara; R. Katsumata; Y. Mizukami; M. Yamashita; H. Ikeda; T. Terashima; A. Carrington; Y. Matsuda; T. Shibauchi
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eye 101
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High-precision measurements of magnetic penetration depth $\lambda$ in clean single crystals of LiFeAs and LiFeP superconductors reveal contrasting low-energy quasiparticle excitations. In LiFeAs the low-temperature $\lambda(T)$ shows a flat dependence indicative of a fully gapped state, which is consistent with previous studies. In contrast, LiFeP exhibits a $T$-linear dependence of superfluid density $\propto \lambda^{-2}$, indicating a nodal superconducting order parameter. A systematic...
Source: http://arxiv.org/abs/1107.4505v1
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63
Sep 20, 2013
09/13
by
E. Aprile; C. E. Dahl; L. DeViveiros; R. Gaitskell; K. L. Giboni; J. Kwong; P. Majewski; K. Ni; T. Shutt; M. Yamashita
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eye 63
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We report the first measurements of the absolute ionization yield of nuclear recoils in liquid xenon, as a function of energy and electric-field. Independent experiments were carried out with two dual-phase time projection chamber prototypes, developed for the XENON Dark Matter project. We find that the charge yield increases with decreasing recoil energy, and exhibits only a weak field dependence. These results are a first demonstration of the capability of dual phase xenon detectors to...
Source: http://arxiv.org/abs/astro-ph/0601552v1
84
84
Sep 22, 2013
09/13
by
M. Yamashita; Y. Senshu; T. Shibauchi; S. Kasahara; K. Hashimoto; D. Watanabe; H. Ikeda; T. Terashima; I. Vekhter; A. B. Vorontsov; Y. Matsuda
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eye 84
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The structure of the superconducting order parameter in the iron-pnictide superconductor BaFe$_2$(As$_{0.67}$P$_{0.33}$)$_2$ ($T_c=31$\,K) with line nodes is studied by the angle-resolved thermal conductivity measurements in a magnetic field rotated within the basal plane. We find that the thermal conductivity displays distinct fourfold oscillations with minima when the field is directed at $\pm45^\circ$ with respect to the tetragonal a-axis. We discuss possible gap structures that can account...
Source: http://arxiv.org/abs/1103.0885v2
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72
Sep 23, 2013
09/13
by
E. Aprile; L. Baudis; B. Choi; K. L. Giboni; K. E. Lim; A. Manalaysay; M. E. Monzani; G. Plante; R. Santorelli; M. Yamashita
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eye 72
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Liquid xenon is an important detection medium in direct dark matter experiments, which search for low-energy nuclear recoils produced by the elastic scattering of WIMPs with quarks. The two existing measurements of the relative scintillation efficiency of nuclear recoils below 20 keV lead to inconsistent extrapolations at lower energies. This results in a different energy scale and thus sensitivity reach of liquid xenon dark matter detectors. We report a new measurement of the relative...
Source: http://arxiv.org/abs/0810.0274v2
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77
Sep 22, 2013
09/13
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D. Watanabe; M. Yamashita; S. Tonegawa; Y. Oshima; H. M. Yamamoto; R. Kato; I. Sheikin; K. Behnia; T. Terashima; S. Uji; T. Shibauchi; Y. Matsuda
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In Mott insulators, the strong electron-electron Coulomb repulsion prevents metallicity and charge excitations are gapped. In dimensions greater than one, their spins are usually ordered antiferromagnetically at low temperatures. Geometrical frustrations can destroy this long-range order, leading to exotic quantum spin liquid (QSL) states. However, their magnetic ground states have been a long-standing mystery. Here we show that a QSL state in the organic Mott insulator...
Source: http://arxiv.org/abs/1210.0407v1
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46
Sep 20, 2013
09/13
by
S. K. Goh; Y. Mizukami; H. Shishido; D. Watanabe; S. Yasumoto; M. Shimozawa; M. Yamashita; T. Terashima; Y. Yanase; T. Shibauchi; A. I. Buzdin; Y. Matsuda
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eye 46
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We report a highly unusual angular variation of the upper critical field (H_c2) in epitaxial superlattices CeCoIn_5(n)/YbCoIn_5(5), formed by alternating layers of n and a 5 unit-cell thick heavy-fermion superconductor CeCoIn_5 with a strong Pauli effect and normal metal YbCoIn_5, respectively. For the n=3 superlattice, H_{c2}(\theta) changes smoothly as a function of the field angle \theta. However, close to the superconducting transition temperature, H_{c2}(\theta) exhibits a cusp near the...
Source: http://arxiv.org/abs/1207.4889v2
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45
Sep 22, 2013
09/13
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K. Hashimoto; Y. Mizukami; R. Katsumata; H. Shishido; M. Yamashita; H. Ikeda; Y. Matsuda; J. A. Schlueter; J. D. Fletcher; A. Carrington; D. Gnida; D. Kaczorowski; T. Shibauchi
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eye 45
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When a second-order magnetic phase transition is tuned to zero temperature by a non-thermal parameter, quantum fluctuations are critically enhanced, often leading to the emergence of unconventional superconductivity. In these `quantum critical' superconductors it has been widely reported that the normal-state properties above the superconducting transition temperature $T_c$ often exhibit anomalous non-Fermi liquid behaviors and enhanced electron correlations. However, the effect of these strong...
Source: http://arxiv.org/abs/1302.2945v1
6
6.0
Jun 30, 2018
06/18
by
M. Shimozawa; K. Hashimoto; A. Ueda; Y. Suzuki; K. Sugii; S. Yamada; Y. Imai; R. Kobayashi; K. Itoh; S. Iguchi; M. Naka; S. Ishihara; H. Mori; T. Sasaki; M. Yamashita
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eye 6
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Strongly enhanced quantum fluctuations often lead to a rich variety of quantum-disordered states. A representative case is liquid helium, in which zero-point vibrations of the helium atoms prevent its solidification at low temperatures. A similar behaviour is found for the internal degrees of freedom in electrons. Among the most prominent is a quantum spin liquid (QSL), in which localized spins are highly correlated but fluctuate even at absolute zero. Recently, a coupling of spins with other...
Topics: Strongly Correlated Electrons, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1703.00324
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43
Sep 22, 2013
09/13
by
R. Okazaki; M. Konczykowski; C. J. van der Beek; T. Kato; K. Hashimoto; M. Shimozawa; H. Shishido; M. Yamashita; M. Ishikado; H. Kito; A. Iyo; H. Eisaki; S. Shamoto; T. Shibauchi; Y. Matsuda
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eye 43
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We have studied the lower critical fields H_{c1} of superconducting iron oxipnictide PrFeAsO_{1-y} single crystals for H parallel and perpendicular to the ab-planes. Measurements of the local magnetic induction at positions straddling the sample edge by using a miniature Hall-sensor array clearly resolve the first flux penetration from the Meissner state. The temperature dependence of H_{c1} for H || c is well scaled by the in-plane penetration depth without showing any unusual behavior, in...
Source: http://arxiv.org/abs/0811.3669v2
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72
Sep 21, 2013
09/13
by
E. Aprile; K. L. Giboni; P. Majewski; K. Ni; M. Yamashita; R. Gaitskell; P. Sorensen; L. DeViveiros; L. Baudis; A. Bernstein; C. Hagmann; C. Winant; T. Shutt; J. Kwong; U. Oberlack; D. McKinsey; R. Hasty
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The XENON experiment aims at the direct detection of dark matter in the form of WIMPs (Weakly Interacting Massive Particles) via their elastic scattering off Xe nuclei. A fiducial mass of 1000 kg, distributed in ten independent liquid xenon time projection chambers(LXeTPCs) will be used to probe thelowest interaction cross section predicted by SUSY models. The TPCs are operated in dual (liquid/gas) phase, to allow a measurement of nuclear recoils down to 16keV energy, via simultaneous detection...
Source: http://arxiv.org/abs/astro-ph/0407575v1
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20
Jun 28, 2018
06/18
by
J. P. Sun; K. Matsuura; G. Z. Ye; Y. Mizukami; M. Shimozawa; K. Matsubayashi; M. Yamashita; T. Watashige; S. Kasahara; Y. Matsuda; J. -Q. Yan; B. C. Sales; Y. Uwatoko; J. -G. Cheng; T. Shibauchi
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eye 20
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The coexistence and competition between superconductivity and electronic orders, such as spin or charge density waves, have been a central issue in high transition-temperature (${T_{\rm c}}$) superconductors. Unlike other iron-based superconductors, FeSe exhibits nematic ordering without magnetism whose relationship with its superconductivity remains unclear. More importantly, a pressure-induced fourfold increase of ${T_{\rm c}}$ has been reported, which poses a profound mystery. Here we report...
Topics: Superconductivity, Materials Science, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1512.06951
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79
Sep 21, 2013
09/13
by
A. Baldini; C. Bemporad; F. Cei; T. Doke; M. Grassi; A. A. Grebenuk; D. N. Grigoriev; T. Haruyama; K. Kasami; J. Kikuchi; A. Maki; T. Mashimo; S. Mihara; T. Mitsuhashi; T. Mori; D. Nicolo`; H. Nishiguchi; W. Ootani; K. Ozone; A. Papa; R. Pazzi; S. Ritt; R. Sawada; F. Sergiampietri; G. Signorelli; S. Suzuki; K. Terasawa; M. Yamashita; S. Yamashita; T. Yoshimura; Yu. Yuri
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eye 79
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An 800L liquid xenon scintillation $\gamma$ ray detector is being developed for the MEG experiment which will search for $\mu^+\to\mathrm{e}^+\gamma$ decay at the Paul Scherrer Institut. Absorption of scintillation light of xenon by impurities might possibly limit the performance of such a detector. We used a 100L prototype with an active volume of 372x372x496 mm$^3$ to study the scintillation light absorption. We have developed a method to evaluate the light absorption, separately from elastic...
Source: http://arxiv.org/abs/physics/0407033v1
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43
Jul 20, 2013
07/13
by
J. Angle; E. Aprile; F. Arneodo; L. Baudis; A. Bernstein; A. Bolozdynya; L. Coelho; E. Dahl; L. DeViveiros; A. Ferella; L. Fernandes; S. Fiorucci; R. J. Gaitskell; K. -L. Giboni; R. Gomez; R. Hasty; J. Kwong; J. A. M. Lopes; N. Madden; A. Manalaysay; A. Manzur; D. McKinsey; M. E. Monzani; K. Ni; U. Oberlack; J. Orboeck; G. Plante; J. Santos; P. Shagin; T. Shutt; P. Sorensen; C. Winant; M. Yamashita
texts
eye 43
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The technique to realize 3D position sensitivity in a two-phase xenon time projection chamber (XeTPC) for dark matter search is described. Results from a prototype detector (XENON3) are presented.
Source: http://arxiv.org/abs/astro-ph/0609714v1
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57
Sep 21, 2013
09/13
by
K. Ueshima; K. Abe; K. Hiraide; S. Hirano; Y. Kishimoto; K. Kobayashi; Y. Koshio; J. Liu; K. Martens; S. Moriyama; M. Nakahata; H. Nishiie; H. Ogawa; H. Sekiya; A. Shinozaki; Y. Suzuki; A. Takeda; M. Yamashita; K. Fujii; I. Murayama; S. Nakamura; K. Otsuka; Y. Takeuchi; Y. Fukuda; K. Nishijima; D. Motoki; Y. Itow; K. Masuda; Y. Nishitani; H. Uchida; S. Tasaka; H. Ohsumi; Y. D. Kim; Y. H. Kim; K. B. Lee; M. K. Lee; J. S. Lee the XMASS Collaboration
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In a dedicated test setup at the Kamioka Observatory we studied pulse shape discrimination (PSD) in liquid xenon (LXe) for dark matter searches. PSD in LXe was based on the observation that scintillation light from electron events was emitted over a longer period of time than that of nuclear recoil events, and our method used a simple ratio of early to total scintillation light emission in a single scintillation event. Requiring an efficiency of 50% for nuclear recoil retention we reduced the...
Source: http://arxiv.org/abs/1106.2209v1
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6.0
Jun 29, 2018
06/18
by
XMASS Collaboration; H. Takiya; K. Abe; K. Hiraide; K. Ichimura; Y. Kishimoto; K. Kobayashi; M. Kobayashi; S. Moriyama; M. Nakahata; T. Norita; H. Ogawa; H. Sekiya; O. Takachio; A. Takeda; S. Tasaka; M. Yamashita; B. S. Yang; N. Y. Kim; Y. D. Kim; Y. Itow; R. Kegasa; K. Masuda; K. Fushimi; K. Martens; Y. Suzuki; R. Fujita; K. Hosokawa; K. Miuchi; N. Oka; Y. Onishi; Y. Takeuchi; Y. H. Kim; J. S. Lee; K. B. Lee; M. K. Lee; Y. Fukuda; K. Nishijima; S. Nakamura
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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 distributions between the observed data and simulated samples in order to take into account optical processes such as absorption and scattering in liquid xenon. Calibration data of radioactive sources, $^{55}$Fe, $^{241}$Am, and $^{57}$Co were used to...
Topics: Nuclear Experiment, Cosmology and Nongalactic Astrophysics, Physics, Astrophysics, Instrumentation...
Source: http://arxiv.org/abs/1604.01503
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50
Sep 21, 2013
09/13
by
J. Angle; E. Aprile; F. Arneodo; L. Baudis; A. Bernstein; A. Bolozdynya; P. Brusov; L. C. C. Coelho; C. E. Dahl; L. DeViveiros; A. D. Ferella; L. M. P. Fernandes; S. Fiorucci; R. J. Gaitskell; K. L. Giboni; R. Gomez; R. Hasty; L. Kastens; J. Kwong; J. A. M. Lopes; N. Madden; A. Manalaysay; A. Manzur; D. N. McKinsey; M. E. Monzani; K. Ni; U. Oberlack; J. Orboeck; G. Plante; R. Santorelli; J. M. F. dos Santos; P. Shagin; T. Shutt; P. Sorensen; S. Schulte; C. Winant; M. Yamashita; for the XENON...
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The XENON10 experiment at the Gran Sasso National Laboratory uses a 15 kg xenon dual phase time projection chamber (XeTPC) to search for dark matter weakly interacting massive particles (WIMPs). The detector measures simultaneously the scintillation and the ionization produced by radiation in pure liquid xenon, to discriminate signal from background down to 4.5 keV nuclear recoil energy. A blind analysis of 58.6 live days of data, acquired between October 6, 2006 and February 14, 2007, and...
Source: http://arxiv.org/abs/0706.0039v2
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62
Sep 18, 2013
09/13
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K. Ueshima; K. Abe; T. Iida; M. Ikeda; K. Kobayashi; Y. Koshio; A. Minamino; M. Miura; S. Moriyama; M. Nakahata; Y. Nakajima; H. Ogawa; H. Sekiya; M. Shiozawa; Y. Suzuki; A. Takeda; Y. Takeuchi; M. Yamashita; K. Kaneyuki; T. Doke; Y. Ebizuka; J. Kikuchi; A. Ota; S. Suzuki; T. Takahashi; H. Hagiwara; T. Kamei; K. Miyamoto; T. Nagase; S. Nakamura; Y. Ozaki; T. Sato; Y. Fukuda; K. Nishijima; M. Sakurai; T. Maruyama; D. Motoki; Y. Itow; H. Ohsumi; S. Tasaka; S. B. Kim; Y. D. Kim; J. I. Lee; S. H....
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The intensity of scintillation light emission from liquid xenon at room temperature was measured. The scintillation light yield at 1 deg. was measured to be 0.64 +/- 0.02 (stat.) +/- 0.06 (sys.) of that at -100 deg. Using the reported light yield at -100 deg. (46 photons/keV), the measured light yield at 1 deg. corresponds to 29 photons/keV. This result shows that liquid xenon scintillator gives high light yield even at room temperature.
Source: http://arxiv.org/abs/0803.2888v1
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48
Sep 21, 2013
09/13
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P. Sorensen; J. Angle; E. Aprile; F. Arneodo; L. Baudis; A. Bernstein; A. Bolozdynya; P. Brusov; L. C. C. Coelho; C. E. Dahl; L. DeViveiros; A. D. Ferella; L. M. P. Fernandes; S. Fiorucci; R. J. Gaitskell; K. L. Giboni; R. Gomez; R. Hasty; L. Kastens; J. Kwong; J. A. M. Lopes; N. Madden; A. Manalaysay; A. Manzur; D. N. McKinsey; M. E. Monzani; K. Ni; U. Oberlack; J. Orboeck; G. Plante; R. Santorelli; J. M. F. dos Santos; P. Shagin; T. Shutt; S. Schulte; C. Winant; M. Yamashita
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We show that the energy threshold for nuclear recoils in the XENON10 dark matter search data can be lowered to ~1 keV, by using only the ionization signal. In other words, we make no requirement that a valid event contain a primary scintillation signal. We therefore relinquish incident particle type discrimination, which is based on the ratio of ionization to scintillation in liquid xenon. This method compromises the detector's ability to precisely determine the z coordinate of a particle...
Source: http://arxiv.org/abs/1011.6439v1
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86
Sep 22, 2013
09/13
by
E. Aprile; J. Angle; F. Arneodo; L. Baudis; A. Bernstein; A. Bolozdynya; P. Brusov; L. C. C. Coelho; C. E. Dahl; L. DeViveiros; A. D. Ferella; L. M. P. Fernandes; S. Fiorucci; R. J. Gaitskell; K. L. Giboni; R. Gomez; R. Hasty; L. Kastens; J. Kwong; J. A. M. Lopes; N. Madden; A. Manalaysay; A. Manzur; D. N. McKinsey; M. E. Monzani; K. Ni; U. Oberlack; J. Orboeck; D. Orlandi; G. Plante; R. Santorelli; J. M. F. dos Santos; P. Shagin; T. Shutt; P. Sorensen; S. Schulte; E. Tatananni; C. Winant; M....
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XENON10 is the first two-phase xenon time projection chamber (TPC) developed within the XENON dark matter search program. The TPC, with an active liquid xenon (LXe) mass of about 14 kg, was installed at the Gran Sasso underground laboratory (LNGS) in Italy, and operated for more than one year, with excellent stability and performance. Results from a dark matter search with XENON10 have been published elsewhere. In this paper, we summarize the design and performance of the detector and its...
Source: http://arxiv.org/abs/1001.2834v1
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10.0
Jun 28, 2018
06/18
by
XMASS Collaboration; K. Abe; K. Hiraide; K. Ichimura; Y. Kishimoto; K. Kobayashi; M. Kobayashi; S. Moriyama; M. Nakahata; T. Norita; H. Ogawa; H. Sekiya; O. Takachio; A. Takeda; M. Yamashita; B. S. Yang; N. Y. Kim; Y. D. Kim; S. Tasaka; K. Fushimi; J. Liu; K. Martens; Y. Suzuki; B. D. Xu; R. Fujita; K. Hosokawa; K. Miuchi; Y. Onishi; N. Oka; Y. Takeuchi; Y. H. Kim; J. S. Lee; K. B. Lee; M. K. Lee; Y. Fukuda; Y. Itow; R. Kegasa; K. Masada; H. Takiya; K. Nishijima; S. Nakamura
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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 exposure accumulated between November 2013 and March 2015. When we assume Weakly Interacting Massive Particle (WIMP) dark matter elastically scattering on the target nuclei, the exclusion upper limit of the WIMP-nucleon cross section...
Topics: High Energy Physics - Experiment, Astrophysics, Cosmology and Nongalactic Astrophysics,...
Source: http://arxiv.org/abs/1511.04807
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43
Sep 21, 2013
09/13
by
J. Angle; E. Aprile; F. Arneodo; L. Baudis; A. Bernstein; A. Bolozdynya; P. Brusov; L. C. C. Coelho; C. E. Dahl; L. DeViveiros; A. D. Ferella; L. M. P. Fernandes; S. Fiorucci; R. J. Gaitskell; K. L. Giboni; R. Gomez; R. Hasty; L. Kastens; J. Kwong; J. A. M. Lopes; N. Madden; A. Manalaysay; A. Manzur; D. N. McKinsey; M. E. Monzani; K. Ni; U. Oberlack; J. Orboeck; G. Plante; R. Santorelli; J. M. F. dos Santos; P. Shagin; T. Shutt; P. Sorensen; S. Schulte; C. Winant; M. Yamashita
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We report results of a search for light ( 3.5x10^{-42} cm^2, for a dark matter particle mass m_{\chi}=8 GeV. We find that our data strongly constrain recent elastic dark matter interpretations of excess low-energy events observed by CoGeNT and CRESST-II, as well as the DAMA annual modulation signal.
Source: http://arxiv.org/abs/1104.3088v4
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40
Sep 19, 2013
09/13
by
J. Angle; E. Aprile; F. Arneodo; L. Baudis; A. Bernstein; A. Bolozdynya; P. Brusov; L. C. C. Coelho; C. E. Dahl; L. DeViveiros; A. D. Ferella; L. M. P. Fernandes; S. Fiorucci; R. J. Gaitskell; K. L. Giboni; R. Gomez; R. Hasty; L. Kastens; J. Kwong; J. A. M. Lopes; N. Madden; A. Manalaysay; A. Manzur; D. N. McKinsey; M. E. Monzani; K. Ni; U. Oberlack; J. Orboeck; G. Plante; R. Santorelli; J. M. F. dos Santos; P. Shagin; T. Shutt; P. Sorensen; S. Schulte; C. Winant; M. Yamashita
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eye 40
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It has been suggested that dark matter particles which scatter inelastically from detector target nuclei could explain the apparent incompatibility of the DAMA modulation signal (interpreted as evidence for particle dark matter) with the null results from CDMS-II and XENON10. Among the predictions of inelastically interacting dark matter are a suppression of low-energy events, and a population of nuclear recoil events at higher nuclear recoil equivalent energies. This is in stark contrast to...
Source: http://arxiv.org/abs/0910.3698v3
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49
Sep 22, 2013
09/13
by
J. Angle; E. Aprile; F. Arneodo; L. Baudis; A. Bernstein; A. Bolozdynya; P. Brusov; L. C. C. Coelho; C. E. Dahl; L. DeViveiros; A. D. Ferella; L. M. P. Fernandes; S. Fiorucci; R. J. Gaitskell; K. L. Giboni; R. Gomez; R. Hasty; L. Kastens; J. Kwong; J. A. M. Lopes; N. Madden; A. Manalaysay; A. Manzur; D. N. McKinsey; M. E. Monzani; K. Ni; U. Oberlack; J. Orboeck; G. Plante; R. Santorelli; J. M. F. dos Santos; P. Shagin; T. Shutt; P. Sorensen; S. Schulte; C. Winant; M. Yamashita; for the XENON10...
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XENON10 is an experiment to directly detect weakly interacting massive particle (WIMPs), which may comprise the bulk of the non-baryonic dark matter in our Universe. We report new results for spin-dependent WIMP-nucleon interactions with 129-Xe and 131-Xe from 58.6 live-days of operation at the Laboratori Nazionali del Gran Sasso (LNGS). Based on the non-observation of a WIMP signal in 5.4 kg of fiducial liquid xenon mass, we exclude previously unexplored regions in the theoretically allowed...
Source: http://arxiv.org/abs/0805.2939v2
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3.0
Jun 28, 2018
06/18
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XMASS Collaboration; K. Abe; K. Hiraide; K. Ichimura; Y. Kishimoto; K. Kobayashi; M. Kobayashi; S. Moriyama; K. Nakagawa; M. Nakahata; T. Norita; H. Ogawa; H. Sekiya; O. Takachio; A. Takeda; M. Yamashita; B. S. Yang; N. Y. Kim; Y. D. Kim; S. Tasaka; J. Liu; K. Martens; Y. Suzuki; R. Fujita; K. Hosokawa; K. Miuchi; N. Oka; Y. Onishi; Y. Takeuchi; Y. H. Kim; J. S. Lee; K. B. Lee; M. K. Lee; Y. Fukuda; Y. Itow; R. Kegasa; K. Masuda; H. Takiya; H. Uchida; K. Nishijima; K. Fujii; I. Murayama; S....
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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 whereas observation of its neutrinoless mode would demonstrate lepton number violation. A search for two-neutrino double electron capture on $^{124}$Xe is performed using 165.9 days of data collected with the XMASS-I liquid xenon detector. No...
Topics: High Energy Physics - Experiment, Instrumentation and Detectors, Nuclear Experiment, Physics
Source: http://arxiv.org/abs/1510.00754
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222
Jul 20, 2013
07/13
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XENON100 Collaboration; E. Aprile; K. Arisaka; F. Arneodo; A. Askin; L. Baudis; A. Behrens; E. Brown; J. M. R. Cardoso; B. Choi; D. Cline; S. Fattori; A. D. Ferella; K. L. Giboni; A. Kish; C. W. Lam; R. F. Lang; K. E. Lim; J. A. M. Lopes; T. Marrodan Undagoitia; Y. Mei; A. J. Melgarejo Fernandez; K. Ni; U. Oberlack; S. E. A. Orrigo; E. Pantic; G. Plante; A. C. C. Ribeiro; R. Santorelli; J. M. F. dos Santos; M. Schumann; P. Shagin; A. Teymourian; E. Tziaferi; H. Wang; M. Yamashita
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The XENON100 dark matter experiment uses liquid xenon (LXe) in a time projection chamber (TPC) to search for Xe nuclear recoils resulting from the scattering of dark matter Weakly Interacting Massive Particles (WIMPs). In this paper we present a detailed description of the detector design and present performance results, as established during the commissioning phase and during the first science runs. The active target of XENON100 contains 62 kg of LXe, surrounded by an LXe veto of 99 kg, both...
Source: http://arxiv.org/abs/1107.2155v2
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51
Jul 22, 2013
07/13
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P. Sorensen; A. Manzur; C. E. Dahl; J. Angle; E. Aprile; F. Arneodo; L. Baudis; A. Bernstein; A. Bolozdynya; P. Brusov; L. C. C. Coelho; L. DeViveiros; A. D. Ferella; L. M. P. Fernandes; S. Fiorucci; R. J. Gaitskell; K. L. Giboni; R. Gomez; R. Hasty; L. Kastens; J. Kwong; J. A. M. Lopes; N. Madden; A. Manalaysay; D. N. McKinsey; M. E. Monzani; K. Ni; U. Oberlack; J. Orboeck; G. Plante; R. Santorelli; J. M. F. dos Santos; P. Shagin; T. Shutt; S. Schulte; C. Winant; M. Yamashita; for the XENON10...
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XENON10 is an experiment designed to directly detect particle dark matter. It is a dual phase (liquid/gas) xenon time-projection chamber with 3D position imaging. Particle interactions generate a primary scintillation signal (S1) and ionization signal (S2), which are both functions of the deposited recoil energy and the incident particle type. We present a new precision measurement of the relative scintillation yield \leff and the absolute ionization yield Q_y, for nuclear recoils in xenon. A...
Source: http://arxiv.org/abs/0807.0459v2
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61
Sep 18, 2013
09/13
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K. Abe; K. Hieda; K. Hiraide; S. Hirano; Y. Kishimoto; K. Kobayashi; S. Moriyama; K. Nakagawa; M. Nakahata; H. Ogawa; N. Oka; H. Sekiya; A. Shinozaki Y. Suzuki; A. Takeda; O. Takachio; K. Ueshima; D. Umemoto; M. Yamashita; B. S. Yang; S. Tasaka; J. Liu; K. Martens; K. Hosokawa; K. Miuchi; A. Murata; Y. Onishi; Y. Otsuka; Y. Takeuchi; Y. H. Kim; K. B. Lee; M. K. Lee; J. S. Lee; Y. Fukuda; Y. Itow; K. Masuda; Y. Nishitani; H. Takiya; H. Uchida; N. Y. Kim; Y. D. Kim; F. Kusaba; D. Motoki; K....
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A search for light dark matter using low-threshold data from the single phase liquid xenon scintillation detector XMASS, has been conducted. Using the entire 835 kg inner volume as target, the analysis threshold can be lowered to 0.3 keVee (electron-equivalent) to search for light dark matter. With low-threshold data corresponding to a 5591.4 kg$\cdot$day exposure of the detector and without discriminating between nuclear-recoil and electronic events, XMASS excludes part of the parameter space...
Source: http://arxiv.org/abs/1211.5404v3
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60
Sep 18, 2013
09/13
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K. Abe; J. Hosaka; T. Iida; M. Ikeda; K. Kobayashi; Y. Koshio; A. Minamino; M. Miura; S. Moriyama; M. Nakahata; Y. Nakajima; T. Namba; H. Ogawa; H. Sekiya; M. Shiozawa; Y. Suzuki; A. Takeda; Y. Takeuchi; K. Ueshima; M. Yamashita; K. Kaneyuki; Y. Ebizuka; J. Kikuchi; A. Ota; S. Suzuki; T. Takahashi; H. Hagiwara; T. Kamei; K. Miyamoto; T. Nagase; S. Nakamura; Y. Ozaki; T. Sato; Y. Fukuda; K. Nishijima; M. Sakurai; T. Maruyama; D. Motoki; Y. Itow; H. Ohsumi; S. Tasaka; S. B. Kim; Y. D. Kim; J. I....
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A high performance distillation system to remove krypton from xenon was constructed, and a purity level of Kr/Xe = $\sim 3 \times 10^{-12}$ was achieved. This development is crucial in facilitating high sensitivity low background experiments such as the search for dark matter in the universe.
Source: http://arxiv.org/abs/0809.4413v3
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67
Sep 21, 2013
09/13
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K. Abe; K. Hieda; K. Hiraide; S. Hirano; Y. Kishimoto; K. Kobayashi; S. Moriyama; K. Nakagawa; M. Nakahata; H. Nishiie; H. Ogawa; N. Oka; H. Sekiya; A. Shinozaki; Y. Suzuki; A. Takeda; O. Takachio; K. Ueshima; D. Umemoto; M. Yamashita; B. S. Yang; S. Tasaka; J. Liu; K. Martens; K. Hosokawa; K. Miuchi; A. Murata; Y. Onishi; Y. Otsuka; Y. Takeuchi; Y. H. Kim; K. B. Lee; M. K. Lee; J. S. Lee; Y. Fukuda; Y. Itow; Y. Nishitani; K. Masuda; H. Takiya; H. Uchida; N. Y. Kim; Y. D. Kim; F. Kusaba; D....
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The XMASS project aims to detect dark matter, pp and $^{7}$Be solar neutrinos, and neutrinoless double beta decay using ultra pure liquid xenon. The first phase of the XMASS experiment searches for dark matter. In this paper, we describe the XMASS detector in detail, including its configuration, data acquisition equipment and calibration system.
Source: http://arxiv.org/abs/1301.2815v1
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69
Sep 23, 2013
09/13
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K. Abe; K. Hieda; K. Hiraide; S. Hirano; Y. Kishimoto; K. Kobayashi; S. Moriyama; K. Nakagawa; M. Nakahata; H. Ogawa; N. Oka; H. Sekiya; A. Shinozaki Y. Suzuki; A. Takeda; O. Takachio; K. Ueshima; D. Umemoto; M. Yamashita; B. S. Yang; S. Tasaka; J. Liu; K. Martens; K. Hosokawa; K. Miuchi; A. Murata; Y. Onishi; Y. Otsuka; Y. Takeuchi; Y. H. Kim; K. B. Lee; M. K. Lee; J. S. Lee; Y. Fukuda; Y. Itow; K. Masuda; Y. Nishitani; H. Takiya; H. Uchida; N. Y. Kim; Y. D. Kim; F. Kusaba; D. Motoki; K....
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XMASS, a low-background, large liquid-xenon detector, was used to search for solar axions that would be produced by bremsstrahlung and Compton effects in the Sun. With an exposure of 5.6ton days of liquid xenon, the model-independent limit on the coupling for mass $\ll$ 1keV is $|g_{aee}| < 5.4\times 10^{-11}$ (90% C.L.), which is a factor of two stronger than the existing experimental limit. The bounds on the axion masses for the DFSZ and KSVZ axion models are 1.9 and 250eV, respectively....
Source: http://arxiv.org/abs/1212.6153v3
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9.0
Jun 30, 2018
06/18
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K. Abe; K. Hieda; K. Hiraide; S. Hirano; Y. Kishimoto; K. Ichimura; K. Kobayashi; S. Moriyama; K. Nakagawa; M. Nakahata; H. Ogawa; N. Oka; H. Sekiya; A. Shinozaki; Y. Suzuki; A. Takeda; O. Takachio; D. Umemoto; M. Yamashita; B. S. Yang; S. Tasaka; J. Liu; K. Martens; K. Hosokawa; K. Miuchi; A. Murata; Y. Onishi; Y. Otsuka; Y. Takeuchi; Y. H. Kim; K. B. Lee; M. K. Lee; J. S. Lee; Y. Fukuda; Y. Itow; K. Masuda; H. Takiya; H. Uchida; N. Y. Kim; Y. D. Kim; F. Kusaba; K. Nishijima; K. Fujii; I....
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Bosonic superweakly interacting massive particles (super-WIMPs) are a candidate for warm dark matter. With the absorption of such a boson by a xenon atom these dark matter candidates would deposit an energy equivalent to their rest mass in the detector. This is the first direct detection experiment exploring the vector super-WIMPs in the mass range between 40 and 120 keV. Using 165.9 days of data no significant excess above background was observed in the fiducial mass of 41 kg. The present...
Topics: Physics, Astrophysics, High Energy Physics - Experiment, Cosmology and Nongalactic Astrophysics,...
Source: http://arxiv.org/abs/1406.0502
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12
Jun 30, 2018
06/18
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H. Uchida; K. Abe; K. Hieda; K. Hiraide; S. Hirano; K. Ichimura; Y. Kishimoto; K. Kobayashi; S. Moriyama; K. Nakagawa; M. Nakahata; H. Ogawa; N. Oka; H. Sekiya; A. Shinozaki; Y. Suzuki; A. Takeda; O. Takachio; D. Umemoto; M. Yamashita; B. S. Yang; S. Tasaka; J. Liu; K. Martens; K. Hosokawa; K. Miuchi; A. Murata; Y. Onishi; Y. Otsuka; Y. Takeuchi; Y. H. Kim; K. B. Lee; M. K. Lee; J. S. Lee; Y. Fukuda; Y. Itow; K. Masuda; Y. Nishitani; H. Takiya; N. Y. Kim; Y. D. Kim; F. Kusaba; K. Nishijima; K....
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A search for inelastic scattering of Weakly Interacting Massive Particles (WIMPs) on the isotope $^{129}$Xe was done in data taken with the single phase liquid xenon detector XMASS at the Kamioka Observatory. Using a restricted volume containing 41 kg of LXe at the very center of our detector we observed no significant excess of events in 165.9 days of data. Our background reduction allowed us to derive our limits without explicitly subtracting the remaining events which are compatible with...
Topics: Physics, Astrophysics, High Energy Physics - Experiment, Cosmology and Nongalactic Astrophysics,...
Source: http://arxiv.org/abs/1401.4737
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33
Jun 28, 2018
06/18
by
N. Adachi; V. Adamovitch; Y. Adjovi; K. Aida; H. Akamatsu; S. Akiyama; A. Akli; A. Ando; T. Andrault; H. Antonietti; S. Anzai; M. Kudła; H. Kudo; R. Kumagai; K. Kurogome; A. Kurosu; M. Kuse; A. Lacombe; E. Lefaillet; M. Magara; J. Malinowska; G. Arkoun; M. Malinowski; V. Maroselli; Y. Masui; K. Matsukawa; K. Matsuya; B. Matusik; M. Maulny; P. Mazur; C. Miyake; Y. Miyamoto; C. Avenoso; K. Miyata; M. Miyazaki; M. Molęda; T. Morioka; E. Morita; K. Muto; H. Nadamoto; M. Nadzikiewicz; K....
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Twelve high schools in Japan (of which six are in Fukushima Prefecture), four in France, eight in Poland and two in Belarus cooperated in the measurement and comparison of individual external doses in 2014. In total 216 high-school students and teachers participated in the study. Each participant wore an electronic personal dosimeter "D-shuttle" for two weeks, and kept a journal of his/her whereabouts and activities. The distributions of annual external doses estimated for each region...
Topics: Medical Physics, Physics
Source: http://arxiv.org/abs/1506.06364
