First mass measurement of short-lived nuclides at HIRFL-CSR  

作　　者：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 

机构地区：[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

出　　处：《Chinese Science Bulletin》2009年第24期4749-4752,共4页

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 10635080, 10221003, 10675147);National Basic Research Program of China (Grant Nos. 2007CB815000, 2008CB817702);Knowledge Innovation Project of Chinese Academy of Sciences (Grant No. CXTD-J2005-1, KJCX2-SW-N18)

摘　　要：Recent commissioning of the HIRFL-CSR has demonstrated its ability to perform direct mass measurement 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.Recent commissioning of the HIRFL-CSR has demonstrated its ability to perform direct mass measurement 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.

关 键 词：兰州重离子加速器 质量测量 社会责任 核素 兰州放射性束流线 企业 天体物理学 一次测量 

分 类 号：TL56[核科学技术—核技术及应用] O572.32[理学—粒子物理与原子核物理]