Nuclear deexcitation simulator for neutrino interactions and nucleon decays of ${}_{12}C$ and ${}_{16}O$ based on TALYS

Nuclear deexcitation associated with neutrino interactions and nucleon decays has a significant impact on a recent key observable for neutrino detectors: neutron multiplicity. Although several deexcitation simulation studies have been conducted, most are closed-source or have limitations in application. Therefore, we need an open-source deexcitation simulator to be used as a standard deexcitation module in existing neutrino Monte Carlo event generators. To predict the neutron multiplicity comprehensively, the author developed a dedicated nuclear deexcitation simulator based on talys named nucdeex. nucdeex can be used for neutrino interactions and nucleon decays for ${}_{12}C$ and ${}_{16}O$. The author provides the nucdeex codes and sample codes for applying the nucdeex to widely used neutrino Monte Carlo event generators, NEUT, NuWro, and GENIE.