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First mass measurement of short-lived nuclides at HIRFL-CSR
Authors:Xu  HuShan  Tu  XiaoLin  Yuan  YouJin  Xia  JiaWen  Zang  YongDong  Wang  Meng  Mao  RuiShi  Hu  ZhengGuo  Mei  Bo  Shuai  Peng  Zhu  ZhiChao  Tang  ShuWen  Geng  Peng  Liu  Yong  Zhao  TieCheng  Zhang  XueYing  Yang  JianCheng  Mao  LiJun  Zhang  YuHu  Zhou  XiaoHong  Huang  WenXue  Xiao  GuoQing  Zhao  HongWei  Zhan  WenLong
Institution:1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; 
2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 
3 Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
Abstract:Recent commissioning of the HIRFL-CSR has demonstrated its ability to perform direct mass meas-urement for short-lived nuclides. Projectile fragments produced by the 78Kr ions at 481.88 MeV/u were separated with the new radioactive beam line in Lanzhou (RIBLL2), and injected into and stored in the experimental storage ring (CSRe). By operating the CSRe as an isochronous mass spectrometry, a typical mass resolution around 2.0×10-5 has been achieved. The masses for 63Ge, 65As and 67Se were measured for the first time. The measured masses are compared with theoretical predictions and the location of the proton drip-line for As isotopes is discussed. The implication of the 65As mass in the astrophysical rapid proton capture process has also been addressed.
Keywords:radioactive ion beam  mass measurement  isochronous mass spectrometry
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