Low-lying magnetic excitations of doubly-closed-shell nuclei and nucleon-nucleon effective interactions

Journal Article · Wed Apr 15 04:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.044311· OSTI ID:21286870

De Donno, V; Co', G; Maieron, C; Anguiano, M; Lallena, A M; Torres, M Moreno ^[1]

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1. Dipartimento di Fisica, Universita del Salento and, INFN Sezione di Lecce, Via Arnesano, I-73100 Lecce (Italy)

We have studied the low-lying magnetic spectra of {sup 12}C, {sup 16}O, {sup 40}Ca, {sup 48}Ca, and {sup 208}Pb nuclei within the random phase approximation (RPA) theory, finding that the description of low-lying magnetic states of doubly-closed-shell nuclei imposes severe constraints on the spin and tensor terms of the nucleon-nucleon effective interaction. We first used four phenomenological effective interactions, and we obtained good agreement with the experimental magnetic spectra and, to a lesser extent, with the electron scattering responses. Then we made self-consistent RPA calculations to test the validity of the finite-range Gogny D1 interaction. For all the nuclei under study, we found that this interaction inverts the energies of all the magnetic states forming isospin doublets.

• OSTI ID: 21286870
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 79; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CALCIUM 40
CALCIUM 48
CARBON 12
COMPUTERIZED SIMULATION
ELECTRONS
EXCITATION
INTERACTIONS
ISOSPIN
LEAD 208
MAGNETIC SPECTROMETERS
NUCLEONS
OXYGEN 16
RANDOM PHASE APPROXIMATION
SCATTERING
SPECTRA
SPIN