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岩佐 直仁*; 石川 竣喜*; 久保野 茂*; 榊原 昂浩*; 小湊 和也*; 西尾 勝久; 松田 誠; 廣瀬 健太郎; 牧井 宏之; Orlandi, R.; et al.
Physical Review C, 103(1), p.015801_1 - 015801_5, 2021/01
被引用回数:1 パーセンタイル:19.67(Physics, Nuclear)The Be(He,)Be()Li reaction was studied at (He)=30 MeV to deduce the branching ratios of of resonant state at 18.91 - 20.1 MeV in Be, which are necessary to extract the Be(, )Li reaction rate relevant to the Be destruction in the big bang nucleosynthesis, from the Li(,)Be reaction cross section. The decay protons from Be to the ground and first excited states in Li were well-separately measured. The ratio of the 19.235-MeV state was deduced to be 3.41.9%. The 19.86- and 20.1-MeV states were found to decay dominantly into the first excited and ground states of Li, respectively.
若林 泰生; 山口 英斉*; 橋本 尚志*; 早川 勢也*; 栗原 佑蔵*; Binh, D.*; Kahl, D.*; 久保野 茂*; 西村 俊二*; 郷農 靖之*; et al.
no journal, ,
For the rapid proton capture process (-process) in X-ray bursts and the core-collapse stage of supernovae, proton-rich -shell nuclei far from the line of stability play important roles. Studies of the feeding ratios and half-lives of the and electron capture decays of these proton-rich -shell nuclei are of great astrophysical interest not only for nucleosynthesis but also for Fermi and Gamow-Teller transition study. The experiment to measure the half life of decay of Cr was performed using the low-energy RI beam separator (CRIB) of the Center for Nuclear Study (CNS), University of Tokyo. The Cr particles were produced by the Ar + C fusion reaction. A natural C foil of 0.56 mg/cm was installed as the primary target. The Ar primary beam was accelerated up to 3.6 MeV/nucleon by the RIKEN AVF cyclotron. A double sided Si strip detector (DSSD) of 500-m thickness was used as a -ray detector. A Si detector of 1.5-mm thickness was placed just behind the DSSD for a -ray detector. To measure -delayed rays, 3 clover and 1 coaxial Ge detectors were set around the target chamber. The beam was pulsed to measure the half life of the decay of Cr. The -delayed ray of Cr was observed in this experiment. The experimental result will be discussed.