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

• Published in: Chinese science bulletin Vol. 54; no. 24; pp. 4749 - 4752
• Main 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
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science in China Press 01.12.2009
• Subjects: Brief Communication; Chemistry/Food Science; Earth Sciences; Engineering; Humanities and Social Sciences; Life Sciences; multidisciplinary; Nuclear Physics; Physics; Science; Science (multidisciplinary); 一次测量; 兰州放射性束流线; 兰州重离子加速器; 天体物理学; 社会责任; 质量测量; radioactive ion beam; mass measurement; isochronous mass spectrometry
• ISSN: 1001-6538; 1861-9541
• DOI: 10.1007/s11434-009-0719-9

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.