Results 261 to 270 of about 1,135,168 (297)

On Consistent Description of Nuclear Level Density

Journal of Nuclear Science and Technology, 2002
The back–shifted Fermi gas (BSFG) model has been used for description of the nuclear level density at excitation energies up to the nucleon binding energy by fitting the latest experimental low–lying discrete levels and average s–wave nucleon resonance spacings D0.
Vlad Avrigeanu, Tudor Glodariu, Arjan J.M. Plompen, Hermann Weigmann   +3 more
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Collective State Enhancement of Nuclear Level Density

AIP Conference Proceedings, 2009
The comparisons of different phenomenological methods for calculation of vibrational and rotational enhancement factors of nuclear level density in spherical and deformed nuclei are performed. A practical method for the calculation of vibrational enhancement factor and level density parameters is recommended. The asymptotic level density parameters and
Vladimir A. Plujko, Oleksandr M. Gorbachenko, Igor M. Kadenko, Elizaveta V. Kulich, Jan Jolie, Andreas Zilges, Nigel Warr, Andrey Blazhev   +7 more
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Measurement of the Nuclear Level Density at High Spins

Physical Review Letters, 1988
The neutron spectrum from the reaction /sup 92/Zr(/sup 64/Ni, 1n)/sup 155/Er has been measured at an average spin of 52h-dash-bar and for excitation energies between 30 and 36 MeV in /sup 155/Er. Channel and spin selection have been obtained from the Darmstadt-Heidelberg crystal ball.
Henss, S., Ruckelshausen, A., Fischer, R.D., Kuhn, W., Metag, V., Novotny, R., Janssens, R.V.F., Khoo, T.L., Habs, D., Schwalm, D., Freeman, D., Duchene, G., Haas, B., Haas, F., Hlavac, S., Simon, R.S.   +15 more
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Parity dependence of the nuclear level density

Nuclear Physics A, 1993
Abstract We derive a new method to calculate the parity distribution of excited levels in nuclei. We compare our results with the predictions of the Ericson formula in the framework of the equidistantspacing model. We show that the Ericson formula may, in some cases, badly fail to reproduce the exact parity distribution computed by a direct counting ...
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Calculation of nuclear level density from an equation of state

Physical Review C, 1985
The nuclear level density \ensuremath{\rho}(U,I) is derived from an equation of state, without reference to the Fermi gas model. If the yrast line backbends, then the effective level density parameter ${a}_{\mathrm{eff}}$ must be spin dependent at low temperatures. The spin dependent components of ${a}_{\mathrm{eff}}$ renormalize the spin cutoff factor
, Goodman, , Draayer, , Rosensteel
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Correlation of Nuclear Level Densities and Masses

AIP Conference Proceedings, 2006
Level density parameters for 310 nuclei between 19F and 251Cf have been determined for the Back Shifted Fermi Gas and the Constant Temperature models, by fitting both low energy discrete levels and the s‐wave neutron resoance spacings. The determined parameters have been found well correlated with quantites available from the mass tables, and simple ...
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Effect of vibrational states on nuclear level density

Physics of Atomic Nuclei, 2007
Simple methods to calculate a vibrational enhancement factor of a nuclear level density with allowance for damping of collective state are considered. The results of the phenomenological approach and the microscopic quasiparticle-phonon model are compared.
V. A. Plujko, O. M. Gorbachenko
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Influence of nuclear deformation on level density parameter

Modern Physics Letters A, 2016
By using semiclassical method and considering deformed Woods–Saxon mean field potential, single-particle level density g, level density parameter a, and nuclear level density have been calculated for some deformed nuclei with deformation parameters ([Formula: see text], [Formula: see text]).
S. A. Alavi, V. Dehghani
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Effect of residual interactions on nuclear level densities

Nuclear Physics A, 1985
Abstract We calculate the contribution of residual interactions to nuclear level densities in the framework of the random-phase approximation. We first investigate the case of the schematic model for which analytical formulae can be worked out. More realistic calculations are performed numerically for 40 Ca and 56 Ni using oscillator wave functions
Vinh Mau, N., Vautherin, D.
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Shell-Model Combinatorial Calculations of Nuclear Level Densities

Physical Review, 1969
Spin-dependent nuclear level densities were calculated for selected nuclides. In each case the numbers and spins of the levels were determined from a computer-generated list of all contributing shell-model configurations. To calculate the energies of the configurations, we assumed the model nucleus to be an infinitely deep spherical well containing ...
Manny Hillman, J. Robb Grover
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