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

Journal Article · 12 July 2016 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.94.014308 · OSTI ID:1338916

Grimes, S. M. ^[1]; Voinov, A. V. ^[1]; Massey, T. N. ^[1]

---

1. Ohio Univ., Athens, OH (United States)

Here, the spin cutoff parameter determining the nuclear level density spin distribution ρ(J) is defined through the spin projection as < J²_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.

• Research Organization: Ohio Univ., Athens, OH (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0002905; FG02-88ER40387
• OSTI ID: 1338916
• Alternate ID(s): OSTI ID: 1261697
• Journal Information: Physical Review C, Vol. 94, Issue 1; ISSN 2469-9985
• Publisher: APSCopyright Statement
• Country of Publication: United States
• Language: English