Photonuclear production of nuclear isomers using bremsstrahlung induced by laser-wakefield electrons  

作　　者：Hao-Yang Lan Di Wu Jia-Xin Liu Jian-Yao Zhang Huan-Gang Lu Jian-Feng Lv Xue-Zhi Wu Wen Luo Xue-Qing Yan 

机构地区：[1]State Key Laboratory of Nuclear Physics and Technology,and Key Laboratory of HEDP of the Ministry of Education,CAPT,Peking University,Beijing 100871,China [2]School of Nuclear Science and Technology,University of South China,Hengyang 421001,China

出　　处：《Nuclear Science and Techniques》2023年第5期112-124,共13页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China (Nos.11921006,U2230133);Beijing Outstanding Young Scientists Program;National Grand Instrument Project (No.2019YFF01014400);National Key R&D Program of China (No.2022YFA1603303);Open Foundation of Key Laboratory of High Power Laser and Physics,Chinese Academy of Sciences (No.SGKF202104)。

摘　　要：In this study,we theoretically investigate the feasibility of using laser-wakefield accelerated(LWFA)electrons for the photonuclear measurement of nuclear isomers according to the characteristics of the electrons obtained from LWFA experiments conducted at the Compact Laser-Plasma Accelerator(CLAPA)laboratory.The experiments at the CLAPA show that a stable electron beam with an energy of 78-135 MeV and a charge of 300-600 pC can be obtained.The bremsstrahlung spectra were simulated using Geant4,which suggests that a bremsstrahlung source with a peak intensity of 10^(19) photons/s can be generated.Theoretical calculations of isomer production cross sections from the photonuclear reactions on six target nuclei,^(197)Au,^(180)Hf,^(159)Tb,^(115)In,^(103)Rh,and ^(90)Zr,were performed and compared with the available experimental data in EXFOR,which suggest that further experiments are required for a series of photonuclear reaction channels.Flux-averaged cross sections and isomer ratios(IR)resulting from such bremsstrahlung sources are theoretically deduced.The results suggest that IR measurements can be used to constrain nuclear components,such asγstrength function and optical model potential.In addition,the detection of the decay characteristics was evaluated with Geant4 simulations.The use of the LWFA electron beam and its bremsstrahlung for photonuclear studies involving nuclear isomers is anticipated.

关 键 词：Photonuclear reactions Laser–plasma acceleration Flux-averaged isomer ratio 

分 类 号：TL50[核科学技术—核技术及应用]