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Title: Mass-number and excitation-energy dependence of the spin cutoff parameter

Here, the spin cutoff parameter determining the nuclear level density spin distribution ρ(J) is defined through the spin projection as < J 2 z > 1/2 or equivalently for spherical nuclei, (< J(J+1) >/3) 1/2. It is needed to divide the total level density into levels as a function of J. To obtain the total level density at the neutron binding energy from the s-wave resonance count, the spin cutoff parameter is also needed. The spin cutoff parameter has been calculated as a function of excitation energy and mass with a super-conducting Hamiltonian. Calculations have been compared with two commonly used semiempirical formulas. A need for further measurements is also observed. Some complications for deformed nuclei are discussed. The quality of spin cut off parameter data derived from isomeric ratio measurement is examined.
Authors:
 [1] ;  [1] ;  [1]
  1. Ohio Univ., Athens, OH (United States)
Publication Date:
Grant/Contract Number:
NA0002905; FG02-88ER40387
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal Issue: 1; Journal ID: ISSN 2469-9985
Publisher:
APS
Research Org:
Ohio Univ., Athens, OH (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; nuclear level density; spin cutoff parameter
OSTI Identifier:
1338916
Alternate Identifier(s):
OSTI ID: 1261697

Grimes, S. M., Voinov, A. V., and Massey, T. N.. Mass-number and excitation-energy dependence of the spin cutoff parameter. United States: N. p., Web. doi:10.1103/PhysRevC.94.014308.
Grimes, S. M., Voinov, A. V., & Massey, T. N.. Mass-number and excitation-energy dependence of the spin cutoff parameter. United States. doi:10.1103/PhysRevC.94.014308.
Grimes, S. M., Voinov, A. V., and Massey, T. N.. 2016. "Mass-number and excitation-energy dependence of the spin cutoff parameter". United States. doi:10.1103/PhysRevC.94.014308. https://www.osti.gov/servlets/purl/1338916.
@article{osti_1338916,
title = {Mass-number and excitation-energy dependence of the spin cutoff parameter},
author = {Grimes, S. M. and Voinov, A. V. and Massey, T. N.},
abstractNote = {Here, the spin cutoff parameter determining the nuclear level density spin distribution ρ(J) is defined through the spin projection as < J2z > 1/2 or equivalently for spherical nuclei, (< J(J+1) >/3)1/2. It is needed to divide the total level density into levels as a function of J. To obtain the total level density at the neutron binding energy from the s-wave resonance count, the spin cutoff parameter is also needed. The spin cutoff parameter has been calculated as a function of excitation energy and mass with a super-conducting Hamiltonian. Calculations have been compared with two commonly used semiempirical formulas. A need for further measurements is also observed. Some complications for deformed nuclei are discussed. The quality of spin cut off parameter data derived from isomeric ratio measurement is examined.},
doi = {10.1103/PhysRevC.94.014308},
journal = {Physical Review C},
number = 1,
volume = 94,
place = {United States},
year = {2016},
month = {7}
}