Confirmation/Observation of Hindered E2 Strengths in-16,18C

摘要：

The lifetime of the first excited 2+ state in 18C was measured using an upgraded recoil shadow method to determine the electric quadrupole transition.The measured mean lifetime is 18.9±0.9 (stat)±4.4 (syst) ps,which corresponds to a B(E2;2+1→0+gs) value of (4.3±0.2±1.0) e2fm4,or about 1.5 Weisskopf units.The mean lifetime of the first 2+ state in 16C was remeasured to be about 18 ps,about four times shorter than the value reported previously.This discrepancy was explained by incorporating the γ-ray angular distribution measured in this work into the previous measurement.The observed transition strengths in 16,18C are hindered compared to the empirical transition strengths,indicating that the anomalous hindrance observed in 16C persists in 18C.

关键词： neutron-rich nuclei lifetime measurement B(E2)

作者: H.J.Ong T.Nakao Y.Togano Y.Kondo N.Aoi H.Baba B.Shawn Y.Ichikawa M.Ishihara T.Kubo K.Kurita N.Imai T.Motobayashi T.Nakamura T.Okumura Y.Yanagisawa D.Suzuki H.Iwasaki H.Sakurai T.Onishi M.Suzuki S.Otas S.Takeuchi

作者单位: RCNP,Osaka University,10-1 Mihogaoka,Ibaraki,567-0047 Osaka,Japan RIKEN Nishina Center,RIKEN,Hirosawa 2-1,Wako,Saitama 351-0198,Japan Department of Physics,University of Tokyo,Hongo 7-3-1,Bunkyo,Tokyo 113-0033,Japan RIKEN Nishina Center,RIKEN,Hirosawa 2-1,Wako,Saitama 351-0198,Japan;Department of Physics,Tokyo Inst Department of Physics,Rikkyo University,Nishi-Ikebukuro 3-34-1,Toshima,Tokyo 171-8501,Japan KEK,Oho 1-1,Tsukuba,Ibaraki 305-0801,Japan Department of Physics,Tokyo Institute of Technology,Ookayama 2-12-1,Meguro,Tokyo 152-8551,Japan Department of Physics,University of Tokyo,Hongo 7-3-1,Bunkyo,Tokyo 113-0033,Japan;RIKEN Nishina Cent CNS,University of Tokyo,RIKENCampus,Hirosawa 2-1,Wako,Saitama 351-0198,Japan

会议类型: 国际会议

会议名称: 3rd China-Japan-Korea Hadron and Nuclear Physics 2008 Symposium(第三届中日韩强子物理与核物理研讨会)

会议地点: 兰州

会议语种:英文

页码: 70-74

在线出版日期: 2008-06-23（万方平台首次上网日期，不代表论文的发表时间）