Study of the double-beta-decay of 100 <A nuclei within the QRPA, RQRPA and the SRQRPA formalisms
Department of Theoretical Physics, Maria Curie-Skłodowska University, Radziszewskigo 10, PL-20-031, Lublin, Poland
2 Institute of Theoretical Physics, University of Tuebingen, Auf der Morgenstelle 14, D-72076, Tuebingen, Germany
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We have used a self-consistent version of the BCS + RQRPA method for a systematic study of the two-neutrino double-beta-decay of nuclei with . The comparison with other approaches, namely the QRPA and the RQRPA, shows that inclusion of the quasiparticle correlations at the BCS level reduces the ground-state correlations in the particle-particle channel of the proton-neutron interaction. This in turn results in a systematic reduction of the double-beta-decay matrix elements. The effect of the extension of the formalism on the Ikeda sum rule has been discussed.
© Società Italiana di Fisica and Springer-Verlag, 2004