Abstract
Monte Carlo simulations for particle andγ-ray emissions from a compound nucleus based on the Hauser-Feshbach statistical theory are performed. The Monte Carlo method is applied to the neutron induced nuclear reactions on 56 Fe, and the results are compared with a traditional deterministic method. The neutron and γ-ray emission correlation is examined by gating on an 847 keVγ-ray that is produced by an inelastic scattering process. The partial γ-ray energy spectra for differentγ-ray multiplicities is inferred using this Monte Carlo method.
Highlights
Nuclear reaction model codes like GNASH [1], have rather complicated algorithms to generate reaction-wise energy spectra for individual particle emission process
In the GNASH case, all the decay probabilities at each intermediate stage are recorded, and the data are processed with a supplemental FORTRAN program, RECOIL [2], to calculate the exclusive spectra
Three paths are depicted as examples, all leading to the ground state of (Z, A−1) nucleus: (a) two neutrons are successively emitted from the initial compound nucleus, and the residual nucleus decays
Summary
Nuclear reaction model codes like GNASH [1], have rather complicated algorithms to generate reaction-wise (or exclusive) energy spectra for individual particle emission process. Instead of performing the complicated integration over all the probabilities at each intermediate stage in the course of a compound nucleus decay, we simulate the particle emission process by the Monte Carlo method, and record all the particles and γrays with their energies until the residual nucleus reaches its ground state. Coincidence experiments, i.e. a scattered neutron detection gated by a particular γ-ray transition, will provide an important benchmark of the modeling of nuclear properties. This kind of investigation, in both theory and experiments, will be more important in the near future for acquiring reliable nuclear data.
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