Observation of Beta-Delayed Proton Decay of<sup> 69</sup>Kr

Xu Xiaoji; Huang Wenxue; Ma Ruichang; Gu Zhongdao; Yang Yongfeng; Wang Yanyu; Dong Chengfu

Chinese Physics C> 1997, Vol. 21> Issue(S1) : 443-446

Observation of Beta-Delayed Proton Decay of⁶⁹Kr

Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, China

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Abstract：
A new group of protons at laboratory energy of 4.07±0.05 MeV with half-life of 32±10 ms was discovered via observing the decay proton spectrum produced in the ³²S + Ca reaction. By reaction channel analysis and comparing with theoretical prediction, this new proton radioactivity was assigned to the β-delayed proton decay of ⁶⁹Kr produced in the ⁴⁰Ca (³²S, 3n) reaction, corresponding to decay of the T=3/2 isobaric analog state in to the ground state of ⁶⁹Se. Combining this measurement with the Coulomb displacement energy calculation yields a mass excess for ⁶⁹Kr of -32.15±0.30 MeV. The partial decay scheme of ⁶⁹Kr was proposed.
- exotic nuclide ,
- beta-delayed particle decay ,
- mass excess
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Xu Xiaoji, Huang Wenxue, Ma Ruichang, Gu Zhongdao, Yang Yongfeng, Wang Yanyu and Dong Chengfu. Observation of Beta-Delayed Proton Decay of⁶⁹Kr[J]. Chinese Physics C, 1997, 21(S1): 443-446.

Xu Xiaoji, Huang Wenxue, Ma Ruichang, Gu Zhongdao, Yang Yongfeng, Wang Yanyu and Dong Chengfu. Observation of Beta-Delayed Proton Decay of⁶⁹Kr[J]. Chinese Physics C, 1997, 21(S1): 443-446. shu

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Received: 1996-08-27

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沈阳化工大学材料科学与工程学院沈阳 110142

Observation of Beta-Delayed Proton Decay of⁶⁹Kr

Institute of Modem Physics, Chinese Academy of Sciences, Lanzhou, China

Received Date: 1996-08-27

Abstract: A new group of protons at laboratory energy of 4.07±0.05 MeV with half-life of 32±10 ms was discovered via observing the decay proton spectrum produced in the ³²S + Ca reaction. By reaction channel analysis and comparing with theoretical prediction, this new proton radioactivity was assigned to the β-delayed proton decay of ⁶⁹Kr produced in the ⁴⁰Ca (³²S, 3n) reaction, corresponding to decay of the T=3/2 isobaric analog state in to the ground state of ⁶⁹Se. Combining this measurement with the Coulomb displacement energy calculation yields a mass excess for ⁶⁹Kr of -32.15±0.30 MeV. The partial decay scheme of ⁶⁹Kr was proposed.