Galactic production of 138La : Impact of 138,139La statistical properties
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.
The original publication is available at https://www.journals.elsevier.com/physics-letters-b
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.