Abstract
We perform Monte Carlo simulations for neutron and γ-ray emissions from a compound nucleus based on the Hauser-Feshbach statistical theory. This Monte Carlo Hauser-Feshbach (MCHF) method calculation, which gives us correlated information between emitted particles and γ-rays. It will be a powerful tool in many applications, as nuclear reactions can be probed in a more microscopic way. We have been developing the MCHF code, CGM, which solves the Hauser-Feshbach theory with the Monte Carlo method. The code includes all the standard models that used in a standard Hauser-Feshbach code, namely the particle transmission generator, the level density module, interface to the discrete level database, and so on. CGM can emit multiple neutrons, as long as the excitation energy of the compound nucleus is larger than the neutron separation energy. The γ-ray competition is always included at each compound decay stage, and the angular momentum and parity are conserved. Some calculations for a fission fragment 140Xe are shown as examples of the MCHF method, and the correlation between the neutron and γ-ray is discussed.
Highlights
To perform radiation transport calculations, the probabilities in nuclear process, such as neutron interaction or γ-ray production, are provided as input data to the simulation
A Monte Carlo simulation of the nuclear reaction process will be able to provide fully correlated information, i.e. all the neutrons and γ-rays emitted at an event obey the energy and angular momentum conservation laws
This paper describes an extension of our Monte Carlo Hauser-Feshbach (MCHF) calculations
Summary
To perform radiation transport calculations, the probabilities in nuclear process, such as neutron interaction or γ-ray production, are provided as input data to the simulation. A Monte Carlo simulation of the nuclear reaction process will be able to provide fully correlated information, i.e. all the neutrons and γ-rays emitted at an event obey the energy and angular momentum conservation laws. CGM runs in both stochastic and deterministic modes with very fine energy grid. This is important to understand neutron emission at very low energies. Spectra of gamma-ray and neutron, and multiplicities from a given state deterministic, or Monte Carlo
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