Eda Sahin

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

The nuclear level densities and $γ$-ray strength functions of $^{138,139,140}$La were measured using the $^{139}$La($^{3}$He, $α$), $^{139}$La($^{3}$He, $^{3}$He$^\prime$) and $^{139}$La(d, p) reactions. The particle-$γ$ 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($n, γ)$ cross sections were calculated at $s$- and $p$-process temperatures using the experimentally measured nuclear level densities and $γ$-ray strength functions. Good agreement is found between $^{139}$La($n, γ)$ calculated cross sections and previous measurements.