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CuPedersen, L. G.*; Sahin, E.*; G
rgen, A.*; Bello Garrote, F. L.*; 角田 佑介*; 大塚 孝治*; 新倉 潤*; Orlandi, R.; 他59名*
Physical Review C, 107(4), p.044301_1 - 044301_10, 2023/04
被引用回数：0 パーセンタイル：0.02(Physics, Nuclear)Nuclei in the vicinity of Ni (
=28, 
=50) are important benchmarks to study the evolution of shell structure far from stability. Excited states in Cu were observed for the first time following the 
-decay of Ni, which was produced by in-flight fission of 
U. Using 
-ray coincidences, a level scheme comprising eight excited states was built. Using the observed feeding and the -decay properties of the excited states, spin was tentatively assigned to 5 new states. In addition to the -decaying states, an isomeric state with a lifetime of 3.8(4) ms was found to decay by internal conversion. By comparing the results with large scale shell model calculations, quantitative information about the proton-neutron interaction outside the doubly magic Ni core was obtained.
elastic scattering in the momentum range 0.44-0.80 GeV/c七村 拓野; 藤田 真奈美; 長谷川 勝一; 市川 真也; 市川 裕大; 今井 憲一*; 成木 恵; 佐藤 進; 佐甲 博之; 田村 裕和; et al.
Progress of Theoretical and Experimental Physics (Internet), 2022(9), p.093D01_1 - 093D01_35, 2022/09
被引用回数：5 パーセンタイル：67.44(Physics, Multidisciplinary)We performed a novel 
scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 elastic scattering events were identified from 
tagged 
particles in the momentum range 0.44 - 0.80 GeV/c. The differential cross sections of the elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the 
and 
channels for the first time. The phase shift of the 3S1 channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated to be 
. If the sign of 
is assumed to be negative, the interaction in this channel is moderately repulsive, as the Nijmegen extended-sort-core models predicted.
photoproduction off the proton at 
= 1.3-2.4 GeV村松 憲仁*; 土川 雄介; LEPS2/BGOegg Collaboration*; 他59名*
Physical Review C, 102(2), p.025201_1 - 025201_10, 2020/08
被引用回数：8 パーセンタイル：69.78(Physics, Nuclear)For the reaction 
, differential cross sections, photon beam asymmetries, and spin density matrix elements have been measured in the BGOegg experiment at the SPring-8 LEPS2 beamline by using a large acceptance electromagnetic calorimeter. A 1.3-2.4 GeV photon beam with high linear polarization has enabled a precision measurement of photon beam asymmetries 
and polarized spin density matrix elements 
over a wide angular range, especially above the total energy of about 2 GeV for the first time. The measured indicates the dominance of 
-channel resonances even at higher energies. The values at backward angles are not reproduced by the existing partial-wave analysis in the highest-energy region, providing new constraints to the contribution of nucleon resonances with high spins.
via the in-flight 
reaction at J-PARC K1.8BR川崎 新吾*; 橋本 直*; 谷田 聖; 他59名*
JPS Conference Proceedings (Internet), 13, p.020018_1 - 020018_5, 2017/02
Experimental investigation of via the in-flight reaction is being performed at the J-PARC K1.8BR beam-line (J-PARC E31). The first E31 physics run was carried out in June, 2016. About 
kaons were irradiated on the deuteron target. The missing mass spectra of the "
" reactions were measured. The difference between the two spectra was observed clearly, which tells us the existence of the interference term between the isospin 
= 0 and 1 amplitudes. The missing mass spectrum of the 
"
" reaction was also measured, which gives the information on the =1 amplitude. The identification of the "
" reaction seems successful.
