Single-particle effects in precompound reactions: Influence of the f/sub 7/2/ shell closure

Journal Article · Thu Aug 01 04:00:00 EDT 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.32.411· OSTI ID:5348701

Blann, M; Grimes, S M; Hansen, L F; Komoto, T T; Pohl, B A; Scobel, W; Trabandt, M; Wong, C

We present angle integrated spectra for the (p,n) reaction with 25 MeV protons on targets of 50,52, /sub 24//sup 53/Cr, and on /sub 26//sup 58/Fe, /sub 27//sup 59/Co, /sub 28//sup 60/Ni, and /sub 29//sup 63/Cu. These spectra are compared with two-quasiparticle state densities for proton-particle--neutron-hole configurations, calculated using Nilsson-model single-particle energies. The influence of shell structure on the precompound spectra, previously shown for the g/sub 9/2/ neutron shell closure, is shown here for the f/sub 7/2/ neutron and proton shells. Semiquantitative agreement is shown between experimental results and calculated two-quasiparticle densities. The parameter space of pairing energy, deformation, and oscillator stiffness is explored. Precompound spectra near shell closures are in better agreement with partial state densities from Nilsson-model considerations than with results from more commonly used equidistant spacing models.

• Research Organization: Lawrence Livermore National Laboratory, University of California, Livermore, California 94550
• OSTI ID: 5348701
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 32:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651525* -- Nuclear Properties & Reactions
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
CHROMIUM 50 TARGET
CHROMIUM 52 TARGET
CHROMIUM 53 TARGET
COBALT 59 TARGET
COMPOUND-NUCLEUS REACTIONS
COPPER 63 TARGET
CROSS SECTIONS
DEFORMATION
DIFFERENTIAL CROSS SECTIONS
ENERGY RANGE
HADRON REACTIONS
IRON 58 TARGET
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NEUTRON SPECTRA
NICKEL 60 TARGET
NILSSON-MOTTELSON MODEL
NUCLEAR DEFORMATION
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
PARTICLE MODELS
PRECOMPOUND-NUCLEUS EMISSION
PROTON REACTIONS
QUASI PARTICLES
SINGLE-PARTICLE MODEL
SPECTRA
TARGETS