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Two neutrino double- β decay in deformed nuclei with an angular momentum projected basis

AutorRaduta, A. A. ; Escuderos, Alberto; Faessler, Amand; Moya de Guerra, Elvira ; Sarriguren, Pedro
Palabras clave[PACS] Relation with nuclear matrix elements and nuclear structure
[PACS] Lifetimes, widths
[PACS] Nuclear Density Functional Theory and extensions (includes Hartree–Fock and random-phase approximations)
[PACS] Properties of specific nuclei listed by mass ranges:59 ≤ A ≤ 89
Fecha de publicación22-jun-2004
EditorAmerican Physical Society
CitaciónPhysical Review C 69(6): 064321 (2004)
ResumenFour nuclei which are proved to be 2νββ emitters (76Ge , 82Se , 150Nd , 238U), and four suspected, due to the corresponding Q-values, to have this property (148Nd, 154Sm, 160Gd, 232Th), were treated within a proton-neutron quasiparticle random phase approximation (pnQRPA) with a projected spherical single particle basis. The advantage of the present procedure over the ones using a deformed Woods-Saxon or Nilsson single particle basis is that the actual pnQRPA states have a definite angular momentum while all the others provide states having only K as a good quantum number. The model Hamiltonian involves a mean field term yielding the projected single particle states, a pairing interaction for alike nucleons and a dipole-dipole proton-neutron interaction in both the particle-hole (ph) and particle-particle (pp) channels. The effect of nuclear deformation on the single beta strength distribution as well as on the double beta Gamow-Teller transition amplitude (MGT) is analyzed. The results are compared with the existent data and with the results from a different approach, in terms of the process half-life T1∕2 . The case of different deformations for mother and daughter nuclei is also presented.
Descripción20 pages, 9 tables, 13 figures, 1 appendix.-- PACS nrs.: 23.40.Hc; 21.10.Tg; 21.60.Jz; 27.50.+e.
Versión del editorhttp://link.aps.org/doi/10.1103/PhysRevC.69.064321
ISSN0556-2813 (Print)
1089-490X (Online)
1538-4497 (CD-ROM)
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