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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 named ucex. ucex can be used for neutrino interactions and nucleon decays for C12 and O16. The author provides the ucex codes and sample codes for applying the ucex to widely used neutrino Monte Carlo event generators, NEUT, NuWro, and GENIE. Published by the American Physical Society 2024
S. Abe (Thu,) studied this question.