Direct capture in the Sn-130(n,gamma)Sn-131 and Sn-132(n,gamma)Sn-133 reactions under r-process conditions

作者：Mohr Peter^*

来源：Physical Review C, 2012, 86(6): 068803.

DOI：10.1103/PhysRevC.86.068803

The cross sections of the Sn-130(n,gamma)Sn-131 and Sn-132(n,gamma)Sn-133 reactions are calculated in the direct capture model at low energies below 1.5 MeV. Using recent data from (d, p) transfer experiments on Sn-130 and Sn-132, it is possible to avoid global input parameters with their inherent uncertainties and to determine all inputs to the direct capture model by local adjustments. The calculated direct capture cross sections of Sn-130 and Sn-132 are almost identical and have uncertainties of less than a factor of 2. The stellar reaction rates N-A show a slight increase with temperature. Finally, an estimate for the influence of low-lying resonances to the stellar reaction rates is given. DOI: 10.1103/PhysRevC.86.068803

• 出版日期2012-12-14