Development of nuclear de-excitation model EBITEM Ver.2

Abstract

ABSTRACTThe gamma de-excitation model of the general-purpose radiation transport code Particle and Heavy Ion Transport code System, called the Evaluated Nuclear Structure Data File (ENSDF)-Based Isomeric Transition and isomEr production Model (EBITEM) has been upgraded with a focus on precise neutron-capture reaction simulation. The first de-excitation subsequent to neutron capture of numerous nuclei, which was formerly simulated by a model based on the single particle model, is calculated using the Evaluated Gamma Activation File. The database used for further de-excitation, ENSDF, retrieved in 2013, was replaced with Reference Input Parameter Library 3 to consider internal conversion. The internal conversion process was interfaced with the atomic de-excitation model to assess the emission of Auger electrons and fluorescent X-rays. The spectra of gamma-rays from neutron-capture reactions calculated by the upgraded EBITEM correlate better with the evaluated cross-section data than those of the previous version.KEYWORDS: Nuclear de-excitationprompt-gamma raysinternal conversion electronsfluorescent X-raysAuger electronsneutron captureEGAFRIPL-3EBITEMPHITS AcknowledgmentsT.O. would like to appreciate Dr. Camilo Cordero Ramirez and Dr. Cdric Jouanne of CEA (French Alternative Energies and Atomic Energy Commission) for useful discussions on the gamma de-excitation simulation algorithms and relevant databases. Also, T.O. would like to thank Dr. Koji Niita of RIST for his useful suggestions on the model development.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was partly supported by JSPS KAKENHI grant number [18K14159].