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

Kheswa, B. V. ; Wiedeking, M. ; Giacoppo, F. ; Goriely, S. ; Guttormsen, M. ; Larsen, A. C. ; Bello Garrote, F. L. ; Eriksen, T. K. ; Gorgen, A. ; Hagen, T. W. ; Koehler, P. E. ; Klintefjord, M. ; Nyhus, H. T. ; Papka, P. ; Renstrom, T. ; Rose, S. ; Sahin, E. ; Siem, S. ; Tornyi, T. (2015)

CITATION: Kheswa, B. V. et al. 2015. Galactic production of 138La : Impact of 138,139La statistical properties. Physics Letters B, 744:268–272, doi:10.1016/j.physletb.2015.03.065.

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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 νecapture on 138Ba as the main contributor to the synthesis of 138La in Type II supernovae.

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