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Abstract : |
Cross sections have been measured up to 35 MeV excitation for the Se-76(n,p)As-76 reaction at five laboratory angles between 0 degrees and 15 degrees. The incident neutron energy was 198 MeV. The distribution of Grunow-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 Ge-76(p,n)As-76 reaction to obtain an estimate of a lower limit for the lifetime of Ge-76 for beta beta decay. The estimate is in qualitative agreement with the measured lifetime., |
