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  • Open Access

Benchmarks and applications of the nuclear deexcitation event generator nucdeex

Seisho Abe*,†

  • Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan

  • *Contact author: seisho@hep.phys.s.u-tokyo.ac.jp
  • †Present address: Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
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Phys. Rev. D 112, 112013 – Published 15 December, 2025

DOI: https://doi.org/10.1103/2v9j-ncf4

Abstract

Neutron multiplicity is a key observable in recent neutrino experiments that can enhance the sensitivity of various neutrino physics searches. Nuclear deexcitation plays a significant role in neutron emissions associated with neutrino-nucleus interactions. Therefore, precise prediction of this process is essential. To address this need, a general-purpose nuclear deexcitation event generator nucdeex was developed and released as an open-source package. The treatment of low-lying discrete excited states was updated to better reproduce experimental data. Benchmarks were conducted using existing nuclear deexcitation event generators and experimental data. Application to other simulators, neutrino event generator neut and general particle simulation tool geant4, are also presented.

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Phys. Rev. D 112, 112013– Published 15 December, 2025
  • Received 10 September 2025
  • Accepted 3 December 2025
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