Nuclear deexcitation simulator for neutrino interactions and nucleon decays of C12 and <mml:mi mathvariant="…

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 <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mmultiscripts><a:mrow><a:mi mathvariant="normal">C</a:mi></a:mrow><a:mprescripts/><a:none/><a:mrow><a:mn>12</a:mn></a:mrow></a:mmultiscripts></a:mrow></a:math> and <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mrow><d:mmultiscripts><d:mrow><d:mi mathvariant="normal">O</d:mi></d:mrow><d:mprescripts/><d:none/><d:mrow><d:mn>16</d:mn></d:mrow></d:mmultiscripts></d:mrow></d:math>. 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.