학술논문
Ultra-short lifetime isomer studies from photonuclear reactions using laser-driven ultra-intense {\gamma}-ray
Document Type
Working Paper
Author
Wu, Di; Lan, Haoyang; Liu, Jiaxing; Lu, Huangang; Zhang, Jianyao; Lv, Jianfeng; Wu, Xuezhi; Zhang, Hui; Xia, Yadong; He, Qiangyou; Cai, Jie; Ma, Qianyi; Xia, Yuhui; Wang, Zhenan; Wang, Meizhi; Yang, Zhiyan; Xu, Xinlu; Geng, Yixing; Lin, Chen; Ma, Wenjun; Zhao, Yanying; Wang, Haoran; Liu, Fulong; He, Chuangye; Yu, Jinqing; Guo, Bing; Zhang, Guoqiang; Xu, Furong; Wang, Naiyan; Ma, Yugang; Mourou, Gérard; Yan, Xueqing
Source
Subject
Language
Abstract
Isomers, ubiquitous populations of relatively long-lived nuclear excited states, play a crucial role in nuclear physics. However, isomers with half-life times of several seconds or less barely had experimental cross section data due to the lack of a suitable measuring method. We report a method of online {\gamma} spectroscopy for ultra-short-lived isomers from photonuclear reactions using laser-driven ultra-intense {\gamma}-rays. The fastest time resolution can reach sub-ps level with {\gamma}-ray intensities >10^{19}/s ({\geqslant} 8 MeV). The ^{115}In({\gamma}, n)^{114m2}In reaction (T_{1/2} = 43.1 ms) was first measured in the high-energy region which shed light on the nuclear structure studies of In element. Simulations showed it would be an efficient way to study ^{229m}Th (T_{1/2} = 7 {\mu}s), which is believed to be the next generation of nuclear clock. This work offered a unique way of gaining insight into ultra-short lifetimes and promised an effective way to fill the gap in relevant experimental data.