Galactic production of 138 La: Impact of 138,139 La statistical properties

• DOI: 10.1016/j.physletb.2015.03.065
• Publication Date: 2015-04-05T23:17:47Z
• Authors: 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
• Keywords: Nuclear and High Energy Physics; Physics; QC1-999; Astrophysics; 530; 01 natural sciences; 7. Clean energy; Physique atomique et nucléaire; Maxwellian averaged cross-sections; Photodisintegration; Supernovae; 13. Climate action; 0103 physical sciences; γ-ray strength functions; Nuclear level densities; Y-ray strength functions; Astrophysique

AbstractThe 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.