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Chinese Physics C> 1997, Vol. 21> Issue(3) : 286-288 

Observation of Beta-Delayed Proton Decay of 69Kr

  •  Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000

  • A new group of protons at a laboratory energy of (4.07±0.05) MeV with half-life of (32±10)ms was discovered via observing the decay proton spectrum resulting from 32S+Ca reaction.By reaction channel analyses and comparing with theoretical prediction,this new proton radioactivity was assigned to arising from the beta-delayed proton decay of 69Kr produced in the 40Ca(32S,3n) reaction,corresponding to decay of the T=3/2 isobaric analog state in 69Br to the ground state of 68Se.Combining this measurement with Coulomb displacement energy calculation yields a mass excess for 69Kr of (－32.15±0.30)MeV. The partial decay scheme of 69Kr was proposed.
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    [1] J. C. Batchelder, D. M. Moltz, T. J. Ognibene et al., Phys. Rev., C47(1993)2038.[2] B. Blank, S. Andriamonje, S. Czajkowski et al., Phys. Rev. Lett, 74(1995)4611.[3] R. G. Sextro, R. A. Gough, J. Cerny, Nucl. Phys., A234(1974) 130.[4] Takayoshi Horiguchi, Takahiro Tachibana, Tsutomu Tamura, Chart of The Nuclides 1992.

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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 of 69Kr[J]. Chinese Physics C, 1997, 21(3): 286-288.
Xu Xiaoji, Huang Wenxue, Ma Ruichang, Gu Zhongdao, Yang Yongfeng, Wang Yanyu and Dong Chengfu. Observation of Beta-Delayed Proton Decay of 69Kr[J]. Chinese Physics C, 1997, 21(3): 286-288. shu
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Received: 1900-01-01
Revised: 1900-01-01
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Observation of Beta-Delayed Proton Decay of 69Kr

    Corresponding author: Xu Xiaoji,
  • Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000
  • Received Date: 1900-01-01
  • Accepted Date: 1900-01-01
  • Available Online: 1997-03-05

Abstract: A new group of protons at a laboratory energy of (4.07±0.05) MeV with half-life of (32±10)ms was discovered via observing the decay proton spectrum resulting from 32S+Ca reaction.By reaction channel analyses and comparing with theoretical prediction,this new proton radioactivity was assigned to arising from the beta-delayed proton decay of 69Kr produced in the 40Ca(32S,3n) reaction,corresponding to decay of the T=3/2 isobaric analog state in 69Br to the ground state of 68Se.Combining this measurement with Coulomb displacement energy calculation yields a mass excess for 69Kr of (－32.15±0.30)MeV. The partial decay scheme of 69Kr was proposed.

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