skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Parity-Projected Shell Model Monte Carlo Level Densities for fp-shell Nuclei

Abstract

We calculate parity-dependent level densities for the even-even isotopes 58,62,66Fe and 58Ni and the odd-A nuclei 59Ni and 65Fe using the Shell Model Monte Carlo method. We perform these calculations in the complete fp-gds shell-model space using a pairing+quadrupole residual interaction. We find that, due to pairing of identical nucleons, the low-energy spectrum is dominated by positive parity states. Although these pairs break at around the same excitation energy in all nuclei, the energy dependence of the ratio of negative-to-positive parity level densities depends strongly on the particular nucleus of interest. We find equilibration of both parities at noticeably lower excitation energies for the odd-A nuclei 59Ni and 65Fe than for the neighboring even-even nuclei 58Ni and 66Fe.

Authors:
 [1];  [1];  [1];  [2]
  1. Gesellschaft fur Schwerionenforschung (GSI), Germany
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
932043
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review C; Journal Volume: 75; Journal Issue: 6
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ENERGY DEPENDENCE; EVEN-EVEN NUCLEI; EXCITATION; MONTE CARLO METHOD; NUCLEI; NUCLEONS; PARITY; RESIDUAL INTERACTIONS; SHELL MODELS; IRON ISOTOPES; NICKEL ISOTOPES

Citation Formats

Ozen, C., Langanke, K., Martinez-Pinedo, G., and Dean, David Jarvis. Parity-Projected Shell Model Monte Carlo Level Densities for fp-shell Nuclei. United States: N. p., 2007. Web. doi:10.1103/PhysRevC.75.064307.
Ozen, C., Langanke, K., Martinez-Pinedo, G., & Dean, David Jarvis. Parity-Projected Shell Model Monte Carlo Level Densities for fp-shell Nuclei. United States. doi:10.1103/PhysRevC.75.064307.
Ozen, C., Langanke, K., Martinez-Pinedo, G., and Dean, David Jarvis. Mon . "Parity-Projected Shell Model Monte Carlo Level Densities for fp-shell Nuclei". United States. doi:10.1103/PhysRevC.75.064307.
@article{osti_932043,
title = {Parity-Projected Shell Model Monte Carlo Level Densities for fp-shell Nuclei},
author = {Ozen, C. and Langanke, K. and Martinez-Pinedo, G. and Dean, David Jarvis},
abstractNote = {We calculate parity-dependent level densities for the even-even isotopes 58,62,66Fe and 58Ni and the odd-A nuclei 59Ni and 65Fe using the Shell Model Monte Carlo method. We perform these calculations in the complete fp-gds shell-model space using a pairing+quadrupole residual interaction. We find that, due to pairing of identical nucleons, the low-energy spectrum is dominated by positive parity states. Although these pairs break at around the same excitation energy in all nuclei, the energy dependence of the ratio of negative-to-positive parity level densities depends strongly on the particular nucleus of interest. We find equilibration of both parities at noticeably lower excitation energies for the odd-A nuclei 59Ni and 65Fe than for the neighboring even-even nuclei 58Ni and 66Fe.},
doi = {10.1103/PhysRevC.75.064307},
journal = {Physical Review C},
number = 6,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}