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Setoodehnia, K.*; Chen, A. A.*; 小松原 哲郎*; 久保野 茂*; Binh, D. N.*; Carpino, J. F.*; Chen, J.*; 橋本 尚志*; 早川 岳人; 石橋 陽子*; et al.
Physical Review C, 83(1), p.018803_1 - 018803_4, 2011/01
被引用回数:12 パーセンタイル:60.53(Physics, Nuclear)Sの陽子が非束縛な状態は、古典的な新星爆発やI型X線バーストにおける水素爆発の温度でのP(, )S熱核反応率を強く影響する。特に、スピンとパリティが3と2の同定されている4.7から4.8MeVの励起エネルギーに存在する未観測の2つの状態が反応率に強く影響すると予言されている。最近の実験では、2つの候補の状態が4.699MeVと4.814MeVに観測されたが、実験的にはスピンとパリティの情報が得られていない。われわれはSi(He, )S反応を用いて、Sのインビーム線核分光を行った。スピンとパリティはよく知られているミラー核の状態との比較から同定した。
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.