Nuclear state and level densities of actinides with the shell-model Monte Carlo

2025/09/30 by DeMartini, D., Alhassid, Y. · 1 citation
#FOS: Physical sciences #Nuclear Theory (nucl-th)

paper · doi:10.48550/arxiv.2509.26571

Abstract

The study of heavy open-shell nuclei requires model spaces that are too large for the direct diagonalization approaches of conventional shell-model calculations. The shell-model Monte Carlo (SMMC) method enables calculations of the thermal properties of heavy nuclei in very large model spaces. Here, we extend the SMMC method to the actinides. Fifteen even-even and odd-mass actinides ²³²Th, ^\textrm234-239U, ^\textrm240-243Pu, ^\textrm246-248Cm, and ²⁵⁰Cf are studied using a single-particle model space that is larger than one major shell each for protons and neutrons, with a total dimension of the many-particle space as large as 10³². We use spin projection methods to calculate nuclear level densities and average s-wave neutron resonance spacings, both of which are found to be in good agreement with recent experiments.

Citations

• Nuclear state densities of odd-mass heavy nuclei in the shell model Monte Carlo approach
• Improved microscopic nuclear level densities within the Hartree-Fock-Bogoliubov plus combinatorial method
• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• Level density parameters for the back-shifted fermi gas model in the mass range 40 < A < 250
• The statistical model and nuclear level densities

Cited by

• Low-energy enhancement in the magnetic dipole radiation of actinide nuclei

Related

• Nuclear state densities of odd-mass heavy nuclei in the shell model Monte Carlo approach
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• Statistical models of nuclear level densities