A fully microscopic model of total level density in spherical nuclei

Indispensability of cross-shell contributions in neutron resonance spacing

“…Nuclear level densities (NLDs) are one of the key ingredients for studying nuclear reactions [1], particularly the astrophysical reaction rates at a fixed temperature in terms of the Maxwellian average of cross-sections over a wide energy range [2][3][4][5][6]. NLDs have been calculated using many different approaches, such as simple phenomenological models based on non-interacting degenerate Fermi gas [7][8][9][10] and semi-classical models [11,12] to more complex microscopic mean-field models [13][14][15]. The collective effects are included through the rotational and vibrational enhancement factors in these models.…”

Evidence on the high energy behavior of nuclear level density parameter

“…Numerous experimental methods have been used to study and determine the behavior of NLD, which unfortunately are only used in a very small energy range (mainly at energies lower than a few MeV). Also, extensive efforts have been made in recent decades for theoretical modeling which reproduce these low-energy experimental data with acceptable agreement by setting adjustable parameters or providing realistic models with a fully microscopic approach and by removing approximations and considering various effects [10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Therefore, there is still considerable uncertainties in a very wide range of energies.…”