Galactic production of 138La: Impact of 138,139La statistical properties
oleh: B.V. Kheswa, M. Wiedeking, F. Giacoppo, S. Goriely, M. Guttormsen, A.C. Larsen, F.L. Bello Garrote, T.K. Eriksen, A. Görgen, T.W. Hagen, P.E. Koehler, M. Klintefjord, H.T. Nyhus, P. Papka, T. Renstrøm, S. Rose, E. Sahin, S. Siem, T. Tornyi
| Format: | Article |
|---|---|
| Diterbitkan: | Elsevier 2015-05-01 |
Deskripsi
The γ-ray strength functions and nuclear level densities of 138La and 139La have been measured below the neutron separation energies. These new data were used to calculate astrophysical Maxwellian-averaged (n,γ) cross-sections to investigate the production and destruction of the p-nucleus 138La in the photodisintegration process. The results confirm the underproduction of 138La in the p-process with respect to the observed abundances and strongly support the ν-process through νe capture on 138Ba as the main contributor to the synthesis of 138La in Type II supernovae. Keywords: γ-ray strength functions, Nuclear level densities, Maxwellian averaged cross-sections