APS » PROLA » Phys. Rev. C » Volume 55 » Issue 6

Phys. Rev. C 55, 2802 - 2810 (1997)

Gamow-Teller strength from the 76Se(n,p)76As reaction: Implications for the double β decay of 76Ge
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R. L. Helmer1,2, M. A. Punyasena3, R. Abegg2, W. P. Alford1, A. Celler4, S. El-Kateb5, J. Engel6, D. Frekers2, R. S. Henderson2,7, K. P. Jackson2, S. Long7, C. A. Miller2, W. C. Olsen3, B. M. Spicer7, A. Trudel4, and M. C. Vetterli2
1University of Western Ontario, London, Ontario, Canada N6A 3K7
2TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
3University of Alberta, Edmonton, Alberta, Canada T6G 2N5
4Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
5King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia
6California Institute of Technology, Pasadena, California
7University of Melbourne, Parkville, Victoria 3052, Australia

Received 19 September 1996

Cross sections have been measured up to 35 MeV excitation for the 76Se(n,p)76As reaction at five laboratory angles between 0° and 15°. The incident neutron energy was 198 MeV. The distribution of Gamow-Teller (GT) strength at excitation energies less than 10 MeV was deduced by carrying out a multipole decomposition of the data. The GT strength below 6 MeV excitation was found to be less than 0.9 units, in qualitative agreement with a quasiparticle random-phase approximation calculation. The present results have been compared with data from the 76Ge(p,n)76As reaction to obtain an estimate of a lower limit for the lifetime of 76Ge for ββ decay. The estimate is in qualitative agreement with the measured lifetime.


©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRC/v55/p2802
DOI: 10.1103/PhysRevC.55.2802
PACS: 25.40.Kv, 24.30.Cz, 27.50.+e, 23.40.-s

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