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

被引：17

作者：

De Donno, V. ^{[1
,2
]}

Co, G. ^{[1
,2
]}

Maieron, C. ^{[1
,2
]}

Anguiano, M. ^{[3
]}

Lallena, A. M. ^{[3
]}

Moreno Torres, M. ^{[3
]}

机构：

[1] Univ Salento, Dipartimento Fis, I-73100 Lecce, Italy

[2] Ist Nazl Fis Nucl, Sez Lecce, I-73100 Lecce, Italy

[3] Univ Granada, Dept Fis Atom Mol & Nucl, E-18071 Granada, Spain

来源：

PHYSICAL REVIEW C | 2009年 / 79卷 / 04期

关键词：

HIGH-SPIN STATES; INELASTIC ELECTRON-SCATTERING; NEUTRINO OSCILLATIONS; M1; TRANSITION; FORM-FACTOR; TENSOR; ELECTROEXCITATION; C-12; EXCHANGE; CA-48;

D O I：

10.1103/PhysRevC.79.044311

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We have studied the low-lying magnetic spectra of C-12, O-16, Ca-40, Ca-48, and Pb-208 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.

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