Isomeric yield ratios for the ^natSb(纬,xn)^{120m,g,122m,g}Sb reactions measured at 40-, 45-, 50-, 55-, and 60-MeV bremsstrahlung energies

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• 作者：Nguyen Van Do^a ; Pham Duc Khue^a ; Kim Tien Thanh^a ; Guinyun Kim^b ; ^{gnkim@knu.ac.kr} ; Man-Woo Lee^b ; Kyung-Sook Kim^b ; Sung-Chul Yang^b ; ^c ; Eunae Kim^d ; Moo-Hyun Cho^d ; ^e ; Won Namkung^e
• 关键词：Isomeric yield ratio ; Photonuclear reaction ; natSb(纬 ; xn)120m ; g ; 122m ; gSb ; Activation method ; 40- ; 45- ; 50- ; 55- ; 55- ; and 60-MeV bremsstrahlung ; HPGe detector
• 刊名：Nuclear Instruments and Methods in Physics Research Section B ; Beam Interactions with Materials and Atoms
• 出版年：2012
• 期刊代码：42_0168583x
• 类别：ph
• 出版时间：15 July, 2012
• 卷：283
• 期：Complete
• 页码：40-45
• 文件大小：445 K

摘要

We measured the isomeric yield ratios for the ^120m,gSb and ^122m,gSb isomeric pairs produced by ^natSb(纬,xn)^{120m,g,122m,g}Sb photonuclear reactions in the bremsstrahlung energy region from 40 to 60 MeV with a step size of 螖E = 5 MeV by the activation method. The induced 纬-activities of the irradiated samples were measured by a coaxial high purity germanium detector coupled to a PC-based multichannel analyzer. The necessary corrections were made to improve the accuracy of the experimental results. The experimental results at bremsstrahlung energies of 40, 45, 50, 55, and 60 MeV were 0.045 卤 0.003, 0.046 卤 0.003, 0.048 卤 0.003, 0.050 卤 0.003, and 0.049 卤 0.003 for the ^120m,gSb isomeric pair, and 0.341 卤 0.022, 0.362 卤 0.020, 0.374 卤 0.021, 0.371 卤 0.021, and 0.358 卤 0.022 for the ^122m,gSb isomeric pair, respectively. The present results are the first measurements at bremsstrahlung energies just above the giant dipole resonance region. The obtained results confirm the dependence of the isomeric yield ratios on the incident energy and the reaction channel effect observed in some earlier experiments.