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石川 貴嗣*; 保坂 淳; Gubler, P.; 佐甲 博之; 谷田 聖; 他33名*
Proceedings of Science (Internet), 500, p.225_1 - 225_5, 2026/01
We plan to measure cross sections for pion-induced phi-meson production on the proton at the high-intensity high-momentum secondary-particle beamline at J-PARC under the E95 physics program to study nucleon resonances and a possible hidden-strangeness pentaquark baryon in the phi-nucleon channel, which are expected to appear in the s-channel intermediate state of the reaction. The pentaquark baryon is a candidate for the origin of the unresolved bump that observed in the differential cross section at forward angles for photoproduction of phi mesons on the proton. We use several incident negative-pion momenta ranging from 1.6 to 2.4 GeV/c and detect positive and negative kaon pairs from the phi-meson decays utilizing the existing spectrometer with large acceptance. In this contribution, we will give a brief introduction of this E95 physics program.
Balibrea-Correa, J.*; 木村 敦; 他133名*
Nuclear Instruments and Methods in Physics Research A, 1064, p.169385_1 - 169385_13, 2024/07
被引用回数：4 パーセンタイル：71.04(Instruments & Instrumentation)A Monte Carlo method for detectors using the Total Energy Deposition principle (which is obtained via application of the PHWT) was proposed. In this method, both dead-time and pile-up effects are considered simultaneously in a consistent manner. To validate this method in harsh count rate conditions, we have applied it to two different types of C
D liquid scintillators at different count rate conditions and demonstrated the capability to account for these effects in neutron-capture cross-section measurements at the CERN n_TOF facility. The method brings very good results under the count rates up to 
8 c/
s.
isomer in 
Hg and 
(
2) systematics of neutron transitions across the nuclear chartHuang, H.*; Zhang, W. Q.*; Andreyev, A. N.; Liu, Z.*; Seweryniak, D.*; Li, Z. H.*; Guo, C. Y.*; Barzakh, A. E.*; Van Duppen, P.*; Andel, B.*; et al.
Physics Letters B, 833, p.137345_1 - 137345_8, 2022/10
被引用回数：4 パーセンタイル：43.95(Astronomy & Astrophysics)The decay of the 13/2 isomeric state in Hg was observed for the first time following the 
decay of the 13/2 isomer in 
Pb produced in the 
Nd
Cr
reaction. Using -
delayed coincidence measurements, the half-life of this isomer was measured to be 290(30) s. This isomer is proposed to deexcite by an unobserved low-energy 
2 transition to the known 9/2
member of a strongly prolate-deformed 7/2[514] band, followed by a 105-keV 1 transition to the bandhead. A lower limit of B(2)
0.018 W.u. was deduced for the unobserved transition. The presumed retardation is proposed to be due to the notable shape change between the initial, nearly spherical, and the final, strongly deformed, states. A similar scenario is also considered for the 13/2 isomer in 
Hg, suggesting both are cases of shape isomers. The B(2) systematics of neutron transitions across the nuclear chart is discussed.
collisions at Belle IIAbudin
n, F.*; 谷田 聖; Belle II Collaboration*; 他334名*
Physical Review Letters, 125(16), p.161806_1 - 161806_9, 2020/10
被引用回数：63 パーセンタイル：93.02(Physics, Multidisciplinary)We present a search for the direct production of a light pseudoscalar 
decaying into two photons with the Belle II detector at the SuperKEKB collider. We search for the process 
in the mass range 
using data corresponding to an integrated luminosity of 
pb
. Light pseudoscalars interacting predominantly with standard model gauge bosons (so-called axion-like particles or ALPs) are frequently postulated in extensions of the standard model. We find no evidence for ALPs and set 95% confidence level upper limits on the coupling strength 
of ALPs to photons at the level of 
GeV. The limits are the most restrictive to date for 
GeV/
.
Au; The Two-state mixing effectVenhart, M.*; Balogh, M.*; Herz
, A.*; Wood, J. L.*; Ali, F. A.*; Joss, D. T.*; Andreyev, A. N.; Auranen, K.*; Carroll, R. J.*; Drummond, M. C.*; et al.
Physics Letters B, 806, p.135488_1 - 135488_6, 2020/07
被引用回数：8 パーセンタイル：55.23(Astronomy & Astrophysics)The extremely neutron-deficient isotopes 
Au were studied by means of in-beam -ray spectroscopy. Specific tagging techniques, -decay tagging in Au and isomer tagging in 
Au, were used for these studies. Feeding of positive-parity, nearly spherical states, which are associated with 2
and 3
proton-hole configurations, from the 1
proton-intruder configuration was observed in Au. Such a decay path has no precedent in odd-Au isotopes and it is explained by the effect of mixing of wave functions of the initial state.
