Relativistic quasiparticle random-phase approximation description of isoscalar compression modes in open-shell nuclei in the A{approx_equal}60 mass region

Journal Article · Fri Sep 15 04:00:00 EDT 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.74.037303· OSTI ID:20863834

Paar, N; Vretenar, D; Niksic, T; Ring, P

Very recent inelastic {alpha}-scattering data on the isoscalar monopole and dipole strength distributions in {sup 56}Fe, {sup 58}Ni, and {sup 60}Ni are analyzed in the relativistic quasiparticle random-phase approximation (RQRPA) with the DD-ME2 effective nuclear interaction (nuclear matter compression modulus K{sub nm}=251 MeV). The calculation nicely reproduces the observed asymmetric shapes of the monopole strength, and the bimodal structure of the dipole strength distributions. The RQRPA centroid and mean energies are in very good qualitative agreement with the experimental values both for the monopole, and for the low- and high-energy components of the dipole transition strengths. It is noted, however, that while DD-ME2 reproduces in detail the excitation energies of the giant monopole resonances (GMR) in nuclei with A{>=}90, the theoretical centroids are systematically above the experimental values in lighter nuclei with A{<=}60. The latter can be reproduced with an effective interaction with a lower value of K{sub nm}{approx_equal}230 MeV but, because of the asymmetric shapes and pronounced fragmentation of the monopole strength distributions, isoscalar GMR data in light nuclei cannot provide accurate estimates of the nuclear matter compression modulus.

• OSTI ID: 20863834
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 74; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
ASYMMETRY
DIPOLES
DISTRIBUTION
EXCITATION
INELASTIC SCATTERING
IRON 56
LIGHT NUCLEI
MEV RANGE
NICKEL 58
NICKEL 60
NUCLEAR MATTER
RANDOM PHASE APPROXIMATION
RELATIVISTIC RANGE
RESONANCE
SHELL MODELS