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新重丰中子同位素¹⁷⁵Er的合成和γ衰变

The Synthesis and γ Decay of New Heavy Neutron-Rich Nuclide ￣(175)Er

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【作者】杨维凡；袁双贵；张学谦；于暹；牟万统；李宗伟；甘再国；刘洪业；郭俊盛；钟纪泉；孙相富；

【Author】 Yang Weifan; Yuan Shuanggui;Zhang Xueqian; Yu Xian;Mou Wantong;Li Zongwei;Gan Zaiguo; Liu Hongye;Guo Junsheng;Zhong Jiquan; Sun Xiangfu (Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou730000)

【机构】中国科学院近代物理研究所；

【摘要】用１４ＭｅＶ中子轰击天然镜靶，通过１７６Ｙｂ（ｎ，２ｐ）１７５Ｅｒ反应，首次合成了新同位素１７５Ｅｒ．利用γ（Ｘ）谱学方法，对１７５Ｅｒ的活性进行了观测，发现了能量为７６．５，１２０．９，１２３．７，１２８．５，２２７．３，２３４．０，２８１．４，１１６７．５ｋｅＶ半衰期为１．２±０．３ｍｉｎ的八条新γ射线，并指定为１７５Ｅｒ的β－衰变．建立了１７５Ｅｒ的部分衰变纲图．更多还原

【Abstract】 New heavy neutron-rich isotope 175Er was synthesized for the first time in the 176Yb (n,2p) 175Er reaction by 14 MeV neutron irradiation of natural metal ytterbium.The activity of 175Er was observed using γ(X) spectroscopic method. The 8 new γ rays of 76.5, 120.9,123.7, 128.5, 227.3, 234.0,281.4, 1167.5 keV with half-life of 1.2±0.3min was found and assigned to the 175Er decay. A partial decay scheme of 175Er was proposed.更多还原