70As的衰变研究

A decay study of 70As.

作者信息

Li Yan, Shen Shuifa, Shi Shuanghui, Gu Jiahui, Yu Xiaohan, Liu Jingyi, Zeng Jiping

机构信息

Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China.

出版信息

Appl Radiat Isot. 2002 Sep;57(3):399-406. doi: 10.1016/s0969-8043(02)00126-4.

DOI:10.1016/s0969-8043(02)00126-4

PMID:12201148

Abstract

The excited states of the 70Ge nucleus in radioactive decay of 70As were investigated. Four new transitions with 1036.99, 1196.66, 1539.29 and 2531.7 keV have been found. The placement of 2219.34 keV transition has been reassigned, three gamma-rays with 496.74, 1295.24 and 1417.24 keV have been placed in the decay scheme for the first time, and the placements of 1881.67, 2325.42 and 2424.41 keV gamma-rays are confirmed in the present work. Two new levels at 4243.10 and 5265.81 keV excitation energy, respectively, are proposed. The level scheme was established and for a number of levels spin-parity assignments are suggested on the basis of log ft values and gamma-branching ratios.

摘要

研究了(^{70}As)放射性衰变过程中(^{70}Ge)核的激发态。发现了能量分别为(1036.99)、(1196.66)、(1539.29)和(2531.7 keV)的四条新跃迁。重新确定了(2219.34 keV)跃迁的位置，首次将能量为(496.74)、(1295.24)和(1417.24 keV)的三条伽马射线放入衰变纲图中，本工作中还确认了能量为(1881.67)、(2325.42)和(2424.41 keV)伽马射线的位置。分别提出了激发能为(4243.10)和(5265.81 keV)的两个新能级。建立了能级纲图，并根据(\log ft)值和伽马分支比，对一些能级的自旋宇称进行了赋值。