Results 261 to 270 of about 2,392,265 (312)

Projected statistics and level densities

Physical Review Letters, 1993
General exact projection formulas at finite temperature for one-body statistical operators with broken symmetries are derived and applied to the calculation of angular momentum projected average energies and level densities in the static path approximation.
, Rossignoli, , Ansari, , Ring
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The characteristic level and the nuclear level density

Nuclear Physics, 1958
Abstract The suggestions put forward by Bethe and Hurwitz that level densities ought to be measured from a standard energy, such as is given by the semi-empirical formula, and not from nuclear ground states is considered. The semi-empirical formula is corrected, following P. Fong, and this “characteristic level” is determined for nuclei from A = 10
M. El-Nadi, M. Wafik
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Nuclear Level Densities

Nuclear Level Densities, 1992
Part 1 Theoretical approaches to total nuclear level densities: interacting boson model predictions of collective effects in nuclear densities, G.Maino et al role of thermal and quantal fluctuations in the nuclear level density, G.Puddu. Part 2 Theoretical approaches to partial level densities: microscopic models for exciton level densities, M.Herman &
G. Reffo, M. Herman, G. Maino
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Nuclear level densities

Canadian Journal of Physics, 1982
Nuclear level densities are obtained by first calculating the density for non-interacting particles using the Darwin–Fowler method and then folding in approximately the effects of the residual two-body interaction. For the former, the equations resulting from the method of steepest descent are solved numerically with a realistic set of single particle
R. U. Haq, S. S. M. Wong
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Theory of Nuclear Level Density

Physical Review, 1954
We have compared the level density of a nuclear model deduced from a statistical analysis with the results of the exact counting of the levels of the same model. The tables of levels of ${\mathrm{Ne}}^{20}$ given by Critchfield and Oleksa have been used as a test of the statistical theory. A new derivation of the level density is presented.
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Nuclear level densities

Physical Review C, 1976
An improved expression for the nuclear level density is obtained by introducing a higher term in the expansion of the excitation energy in terms of nuclear temperature. The new term leads to better fitting with the experimental results especially at the high excitation energy part of the spectrum.
M. El Nadi, A. Hashem
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LEARNING RATES FOR DENSITY LEVEL DETECTION

Analysis and Applications, 2005
In this paper, we address learning rates for the density level detection (DLD) problem. We begin by proving a "No Free Lunch Theorem" showing that rates cannot be obtained in general. Then, we apply a recently established classification framework to obtain rates for DLD support vector machines under mild assumptions on the density.
Scovel, Clint, Hush, Don, Steinwart, Ingo   +2 more
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Approximation for shell-model level densities

Physical Review C, 1988
The maximum entropy approach for the calculation of nuclear shell-model level densities developed in a previous paper is extended to the calculation of terms of higher order inNk−1, whereNK is the dimension of the shell-model subspaces of interest. We present terms of first and second order inNk−1, i.e.
, Pluha, , Weidenmüller
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