摘要The decay rate variation of 7Be implanted into platinum and aluminum host materials has been measured via detecting the 478keV γ-rays from the first excited state of 7Li populated in the electron capture decay of 7Be. The result (λPt-λAl) /λ0= (-0.17 ± 0.13)% is obtained. It is smaller than the theoretical estimate from the TB-LMTO calculation (0.38%). This is quite different from our previous study which showed a larger decay rate variation ((0.8±0.2)%) than the TB-LMTO calculation (0.30%) of 7Be in palladium and gold. It is suggested that the effective quasi-free electron density near the implanted ions in different metal host materials may play an important role in 7Be EC decay rate variation in addition to the electronic affinity and crystal structure of different host materials.
LI Cheng-Bo;ZHOU Shu-Hua;LIU Zhi-Yi;MENG Qiu-Ying;ZHOU Jing;LI Xiao-Mei;FU Yuan-Yong;WEN Qun-Gang;HU Shou-Yang. Search for Decay Rate Variation of 7Be in Pt and Al[J]. 中国物理快报, 2010, 27(1): 12301-012301.
LI Cheng-Bo, ZHOU Shu-Hua, LIU Zhi-Yi, MENG Qiu-Ying, ZHOU Jing, LI Xiao-Mei, FU Yuan-Yong, WEN Qun-Gang, HU Shou-Yang. Search for Decay Rate Variation of 7Be in Pt and Al. Chin. Phys. Lett., 2010, 27(1): 12301-012301.
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MA Fei;ZHOU Xiao-Hong;ZHENG Yong;XU Shu-Wei;XIE Yuan-Xiang;CHEN Liang;ZHANG Yu-Hu;LI Zhan-Kui;QIANG Yun-Hua;LEI Xiang-Guo;GUO Ying-Xiang;GUO Song;DING Bing;WANG Hai-Xia;LI Guang-Shun;ZHOU Hou-Bing;. Properties of the β-Delayed Proton Decay of 147Er[J]. 中国物理快报, 2010, 27(6): 62104-062104.
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WANG Hua-Lei;SONG Li-Tao;ZHAO Wei-Juan;LIU Zhong-Xia;ZHANG Yu-Hu;ZHOU Xiao-Hong;GUO Ying-Xiang;LEI Xiang-Guo. Observation of a Possible New Isomer in 175Ir[J]. 中国物理快报, 2010, 27(2): 22301-022301.
LIAN Gang;SU Jun;WANG Bao-Xiang;JIANG Chao;BAI Xi-Xiang;ZENGSheng;ZHENG Yong-Nan;ZHU Sheng-Yun;ZHU Li-Hua; LIU Wei-Ping;LI Zhi-Hong;WANG You-Bao;GUO Bing; LI Yun-Ju;QIN Xing. Enhancement of β+-Decay Rate of 22Na in Metal Pd at Low Temperature[J]. 中国物理快报, 2008, 25(1): 70-72.
2010, Vol. 27 
