新核素~（65）Se半衰期的首次实验测定

Abstract

根据４０Ｃａ（２８Ｓｉ，３ｎ）反应中观测到的６５Ｓｅβ延迟质子衰变实验数据，拟合计算粒子望远镜对运动放射源的绝对探测效率，精确测定了６５Ｓｅ的半衰期为９．６ｍｓ，其β延迟质子能量为３．７０±０．０８ＭｅＶ，由此修订了６５Ｓｅ的部分衰变纲图．By using experimental data obtained from the measurement of beta-delayed proton decay of 65 Se produced in 40 Ca(28Si,3n)reaction,the absolute detection efficiency of particle telescope for rotating radioactive source was imitatively calcu-lated.The half-life of 65Se was thus accurately determined to be 9.6 ms.The β-delayed proton energy of 65Se was 3.70±0.08MeV.The partial decay scheme of 65Se β-delayed proton decay was revised and proposed.国家自然科学基金,中国科学院“八五”重大科研项