Spin-dependent observables in surrogate reactions

TL;DR

This paper investigates how spin states influence emitted observables in surrogate reactions, demonstrating that gamma-ray spectra, neutron spectra, and fission fragment distributions depend on spin, thus aiding in inferring spin distributions affecting decay pathways.

Contribution

It provides new insights into spin-dependent observables in surrogate reactions, validating their use to determine spin distributions in compound nuclei.

Findings

Gamma-ray spectra depend on nuclear spin.

Neutron spectra vary with spin states.

Fission fragment distributions are spin-dependent.

Abstract

Observables emitted from various spin states in compound U nuclei are investigated to validate usefulness of the surrogate reaction method. It was found that energy spectrum of cascading $\gamma$-rays and their multiplicities, spectrum of evaporated neutrons, and mass-distribution of fission fragments show clear dependence on the spin of decaying nuclei. The present results indicate that they can be used to infer populated spin distributions which significantly affect the decay branching ratio of the compound system produced by the surrogate reactions.