Level densities in nuclear physics

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In the independent-particle model nucleons move independently in a central potential. There is a well-defined set of single- particle orbitals, each nucleon occupies one of these orbitals subject to Fermi statistics, and the total energy of the nucleus is equal to the sum of the energies of the individual nucleons. The basic question is the range of validity of this Fermi gas description and, in particular, the roles of the residual interactions and collective modes. A detailed examination of experimental level densities in light-mass system is given to provide some insight into these questions. Level densities over the first 10 ... continued below

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Pages: 31

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Beckerman, M January 1, 1978.

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Description

In the independent-particle model nucleons move independently in a central potential. There is a well-defined set of single- particle orbitals, each nucleon occupies one of these orbitals subject to Fermi statistics, and the total energy of the nucleus is equal to the sum of the energies of the individual nucleons. The basic question is the range of validity of this Fermi gas description and, in particular, the roles of the residual interactions and collective modes. A detailed examination of experimental level densities in light-mass system is given to provide some insight into these questions. Level densities over the first 10 MeV or so in excitation energy as deduced from neutron and proton resonances data and from spectra of low-lying bound levels are discussed. To exhibit some of the salient features of these data comparisons to independent-particle (shell) model calculations are presented. Shell structure is predicted to manifest itself through discontinuities in the single-particle level density at the Fermi energy and through variatons in the occupancy of the valence orbitals. These predictions are examined through combinatorial calculations performed with the Grover (Phys. Rev., 157, 832(1967), 185 1303(1969)) odometer method. Before the discussion of the experimenta results, statistical mechanical level densities for spherical nuclei are reviewed. After consideration of deformed nuclei, the conclusions resulting from this work are drawn. 7 figures, 3 tables. (RWR)

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Pages: 31

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NTIS, PC A03/MF A01.

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  • Report No.: DOE/ER/03069-783
  • Grant Number: AC02-76ER03069
  • DOI: 10.2172/5294300 | External Link
  • Office of Scientific & Technical Information Report Number: 5294300
  • Archival Resource Key: ark:/67531/metadc1064257

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1978

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • April 16, 2018, 7:06 p.m.

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Beckerman, M. Level densities in nuclear physics, report, January 1, 1978; United States. (https://digital.library.unt.edu/ark:/67531/metadc1064257/: accessed July 17, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.