Transverse asymmetry of individual γ-rays in the ^139La(n⃗, γ)^140La reaction

The enhancement of the parity-violating asymmetry in the vicinity of p-wave compound nuclear resonances was observed for a variety of medium-heavy nuclei. The enhanced parity-violating asymmetry can be understood using the s-p mixing model. The s-p mixing model predicts several neutron energy-dependent angular correlations between the neutron momentum k⃗_n, neutron spin σ⃗_n, γ-ray momentum k⃗_γ, and γ-ray polarization σ⃗_γ in the (n,γ) reaction. In this paper, the improved value of the transverse asymmetry of γ-ray emissions, corresponding to a correlation term σ⃗_n·(k⃗_n×k⃗_γ) in the ^139La(n⃗,γ)^140La reaction, and the transverse asymmetries in the transitions to several low excited states of ^140La are reported.