Perturbative analysis of the decays of andO. Civitarese1, J. Suhonen2 and H. Ejiri3, 4
1 Department of Physics, University of La Plata, C.C. 67, 1900 La Plata, Argentina
2 Department of Physics, University of Jyväskylä, P.O. Box 35, FIN-40351, Jyväskylä, Finland
3 RCNP, University of Osaka, Suita Campus, 10-1. Mihogaoka, Ibaruki, Osaka, Japan
4 NPL. Department of Physics, University of Washington, Seattle, WA 98195, USA
(Received: 12 August 2002 / Revised version: 21 October 2002 / Published online: 18 February 2003)
We have performed a theoretical analysis of the ground-state-to-ground-state transitions in and , based on the quasiparticle random-phase approximation and on a straightforward perturbative scheme. The results show that the single-state dominance found in the realistic calculations of the nuclear matrix elements, which is consistent with data, can be viewed as a result of the interference between few two-quasiparticle configurations.
23.40.Bw - Weak-interaction and lepton (including neutrino) aspects .
23.40.Hc - Relation with nuclear matrix elements and nuclear structure.
21.60.Jz - Hartree-Fock and random-phase approximations .
27.60.+j - .
© Società Italiana di Fisica, Springer-Verlag 2003