Enhancement of β^＋-Decay Rate of ^22Na in Metal Pd at Low Temperature

作     者：连钢 苏俊 王宝祥 蒋超 白希祥 曾晟 郑永男 朱升云 竺礼华 柳卫平 李志宏 王友宝 郭冰 李云居 秦星 

作者机构：China Institute of Atomic Energy PO Box 275(46) Beijing 102413 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2008年第25卷第1期

页      面：70-72页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0827[工学-核科学与技术] 082701[工学-核能科学与工程] 0704[理学-天文学] 

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10605039  and the Major State Basic Research Programme of China under Grant No 2007CB815003. The the Pd tandem authors thank Professor Xu Guoji for rolling foil and thank the staff at the CIAE HI-13 accelerator 

主　　题：pulsars x-ray spectra relativity and gravitation redshift 

摘      要：Temperature dependence of nuclear decays in metallic environments is a controversial issue. We measured the temperature dependence of the β^＋-decay half-life of ^22Na implanted into the metal host of palladium. It is found that the β^＋-decay half-life of ^22Na in the metal Pd cooled to T = 15 K is shorter by 0.46（14）% than that at room temperature. The result is consistent in sign with, but dearly smaller than, the estimated one by the Debye model.