Eur. Phys. J. A 10, 1-3
Search for 
-delayed fission of the heavy neutron-rich isotope
Yuan Shuanggui, Yang Weifan, Xu Yanbing, Pan Qiangyan, Xiong Bing, He Jianjun, Wang Dong, Li Yingjun, Ma Taotao and Yang Zhenguo Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China ysg@ns.lzb.ac.cn
(Received: 2 November 2000 / Revised version: 8 January 2001 Communicated by D. Guerreau)
Abstract
The 230Ra has been produced via multinucleon transfer reaction and
dissipative fragmentation by 60 MeV/u 18O ion irradiation of 232Th
targets. The radium was radiochemically separated from the mixture of
thorium and reaction products. Thin Ra sources were prepared and exposed to
the mica fission track detectors, and measured by a HPGe gamma detector. It
is likely that the -delayed fission of 230Ac was observed for
the first time and the -delayed fission probability of 230Ac
was tentatively found to be (1.19
0.40)
10-8.
27.90.+b -
.
23.40.-s -
decay; double decay; electron and muon capture.
21.10.Tg - Lifetimes.
25.70.Hi - Transfer reactions.
© Società Italiana di Fisica, Springer-Verlag 2001
