Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-04-26
International Conference on Nuclear Data for Science and Technology, R.C. Haight, M.B. Chadwick, T. Kawano, and P. Talou, eds.
Physics
Nuclear Physics
Nuclear Theory
6 pages, 6 figures
Scientific paper
10.1063/1.1945241
We use quantum Monte Carlo methods in the framework of the interacting nuclear shell model to calculate the statistical properties of nuclei at finite temperature and/or excitation energies. With this approach we can carry out realistic calculations in much larger configuration spaces than are possible by conventional methods. A major application of the methods has been the microscopic calculation of nuclear partition functions and level densities, taking into account both correlations and shell effects. Our results for nuclei in the mass region A ~ 50 - 70 are in remarkably good agreement with experimental level densities without any adjustable parameters and are an improvement over empirical formulas. We have recently extended the shell model theory of level statistics to higher temperatures, including continuum effects. We have also constructed simple statistical models to explain the dependence of the microscopically calculated level densities on good quantum numbers such as parity. Thermal signatures of pairing correlations are identified through odd-even effects in the heat capacity.
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