${}^{137,138,139}$La($n$, $\gamma$) cross sections constrained with statistical decay properties of ${}^{138,139,140}$La nuclei

Abstract

The nuclear level densities and $\gamma$-ray strength functions of ${}^{138,139,140}$La were measured using the ${}^{139}$La(${}^3$He, $\alpha$), ${}^{139}$La(${}^3$He, ${}^3$He${}^{\prime }$) and ${}^{139}$La(d, p) reactions. The particle-$\gamma$ coincidences were recorded with the silicon particle telescope (SiRi) and NaI(Tl) (CACTUS) arrays. In the context of these experimental results, the low-energy enhancement in the A$\sim$140 region is discussed. The ${}^{137,138,139}$La($n,\gamma )$ cross sections were calculated at $s$- and $p$-process temperatures using the experimentally measured nuclear level densities and $\gamma$-ray strength functions. Good agreement is found between ${}^{139}$La($n,\gamma )$ calculated cross sections and previous measurements.

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• Role of consistent parameter sets in an assessment of the alpha-particle optical potential below the Coulomb barrier
• Semi-classical kinetic theory for massive spin-half fermions with leading-order spin effects
• Radiative-capture cross sections for the ${}^{139}$La($n,\gamma$) reactionusing thermal neutrons and structural properties of ${}^{140}$La
• Nuclear level densities and $\gamma$-ray strength functions of ${}^{87}\mathrm{Kr}$ -- First application of the Oslo Method in inverse kinematics