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-II neutrino targetShin, C. D.*; 百々 拓; 羽賀 勝洋; 原田 正英; 長谷川 勝一; 春日井 好己; 木下 秀孝; 増田 志歩; 明午 伸一郎; 酒井 健二; et al.
Journal of Instrumentation (Internet), 18(12), p.T12001_1 - T12001_9, 2023/12
被引用回数：0 パーセンタイル：0.00(Instruments & Instrumentation)The JSNS (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment designed for the search for sterile neutrinos. The experiment is currently at the stage of the second phase named JSNS-II with two detectors at near and far locations from the neutrino source. One of the key components of the experiment is an acrylic vessel, that is used for the target volume for the detection of the anti-neutrinos. The specifications, design, and measured properties of the acrylic vessel are described.
scattering parameters and possible 
bound state from 
photoproduction on the deuteron石川 貴嗣*; 土川 雄介; FOREST Collaboration*; 他48名*
Acta Physica Polonica B, 51(1), p.27 - 32, 2020/00
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)Two physics programs, determination of low-energy scattering parameters between the eta meson () and nucleon (
), and search for a possible bound state between the eta prime meson (
) and deuteron (
), using photoproduction from the deuteron target are conducted at ELPH, Tohoku University. An experiment is carried out to determine the low-energy scattering parameters using a special kinematics. The measurement is currently in progress to determine the real part of the -neutron (
) scattering length. A possible bound state is theoretically predicted, and a structure corresponding to the state can be observed via the 
reaction at incident energies around 1.2 GeV. The angular differential cross sections are determined at backward emission angles. The tail of the corresponding peak is not observed, and the background level is much higher than predicted.
GeVAdare, A.*; 長谷川 勝一; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他448名*
Physical Review C, 98(5), p.054902_1 - 054902_11, 2018/11
被引用回数：17 パーセンタイル：77.05(Physics, Nuclear)We have measured direct photons for 
GeV/
in minimum bias and 0% - 40% most central events at midrapidity for Cu
Cu collisions at GeV. The 
contribution from quasi-real direct virtual photons has been determined as an excess over the known hadronic contributions in the mass distribution. A clear enhancement of photons over the binary scaled 
fit is observed for 
GeV/ in CuCu data. The 
spectra are consistent with the AuAu data covering a similar number of participants. The inverse slopes of the exponential fits to the excess after subtraction of the baseline are 285
53(stat)57(syst)~MeV/ and 33372(stat)45(syst)~MeV/ for minimum bias and 0% - 40% most central events, respectively. The rapidity density, 
, of photons demonstrates the same power law as a function of 
observed in AuAu at the same collision energy.
vy-stable two-pion Bose-Einstein correlations in 
GeV AuAu collisionsAdare, A.*; 長谷川 勝一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他448名*
Physical Review C, 97(6), p.064911_1 - 064911_22, 2018/06
被引用回数：44 パーセンタイル：94.11(Physics, Nuclear)We present a detailed measurement of charged two-pion correlation functions in 0%-30% centrality GeV AuAu collisions by the PHENIX experiment at the Relativistic Heavy Ion Collider. The data are well described by Bose-Einstein correlation functions stemming from L
vy-stable source distributions. Using a fine transverse momentum binning, we extract the correlation strength parameter 
, the Lvy index of stability 
and the Lvy length scale parameter 
as a function of average transverse mass of the pair 
. We find that the positively and the negatively charged pion pairs yield consistent results, and their correlation functions are represented, within uncertainties, by the same Lvy-stable source functions. The 
measurements indicate a decrease of the strength of the correlations at low . The Lvy length scale parameter 
decreases with increasing , following a hydrodynamically predicted type of scaling behavior. The values of the Lvy index of stability are found to be significantly lower than the Gaussian case of 
, but also significantly larger than the conjectured value that may characterize the critical point of a second-order quark-hadron phase transition.
