α-decay study of ^(218)Ac and ^(221)Th in ^(40)Ar+^(186)W reaction  

作　　者：Wei Hua Zhiyuan Zhang Long Ma Zaiguo Gan Huabin Yang Minghui Huang Chunli Yang Mingming Zhang Yulin Tian Xiaohong Zhou Cenx Yuan Caiwan Shen Long Zhu 滑伟;张志远;马龙;甘再国;杨华彬;黄明辉;杨春莉;张明明;田玉林;周小红;袁岑溪;沈彩万;祝龙(Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China;CAS Key Laboratory of High Precision Nuclear Spectroscopy,Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beiing 100049,China;School of Science,Huzhou University,Huzhou 313000,China)

机构地区：[1]Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China [2]CAS Key Laboratory of High Precision Nuclear Spectroscopy,Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [3]School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beiing 100049,China [4]School of Science,Huzhou University,Huzhou 313000,China

出　　处：《Chinese Physics C》2021年第4期242-247,共6页中国物理C（英文版）

基　　金：National Natural Science Foundation of China(11805289,11805291,11875329);the Strategic Priority Research Program of Chinese Academy of Sciences(XDB34010000);the National Key R&D Program of China(2018YFA0404402)。

摘　　要：In this study,^(218)Ac and ^(221)Th nuclides were produced via the heavy-ion induced fusion evaporation reaction ^(40)Ar+^(186)W.Their decay properties were studied with the help of the gas-filled recoil spectrometer SHANS and a digital data acquisition system.The cross section ratio between ^(222)Pa and ^(218)Ac was extracted experimentally,withmeasured value 0.69(9).Two new possible α decay branches to ^(221)Th are suggested.The valence neutron configurations for the daughter ^(217)Ra are discussed in terms of the hindrance factors.

关 键 词：fusion-evaporation reaction αdecay fine structure reduced width hindrance factor 

分 类 号：O571.321[理学—粒子物理与原子核物理]