Abstract
Nuclear matrix elements of the two-neutrino and neutrinolessββ decays of48Ca(0 +g.s. )→48Ti(0 +g.s. ) are calculated by shell model and QRPA. The two-neutrino matrix elementM 2v GT is rather reliably evaluated in the QRPA approach by a careful fit of the particle-particle interaction strength in the 1+ channel, which governs the spinisospin ground-state correlations. The shell-model value ofM 2v GT depends not only on the 1+ interaction but largely on the pairing and quadrupole interactions. Concerning the neutrinoless-mode nuclear matrix elements, the shell model gives generally smaller values than the QRPA. A detailed analysis indicates that the discrepancies originate mainly from the truncation of shell-model configurations (fp-space). The QRPA calculation in a larger model space well takes into account transitions from/to single-particle orbits far from the Fermi surface, and those transitions give rise to sizable contributions because of large momentum transfers due to the exchange of a virtual neutrino.
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Visiting scholar of Faculty of Science, Tokyo Institute of Technology
Present address: Institut für Theoretische Physik, Universität Tübingen, W-7400 Tübingen, Federal Republic of Germany
One of the authors (E.B.) is grateful for financial support to Professor E. Arai of the Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, and to the Centennial Commemoration Fund of Tokyo Institute of Technology. Numerical calculations were performed with FACOM M780/M380 computer systems of the Institute for Nuclear Study, University of Tokyo.
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Muto, K., Bender, E. & Klapdor-Kleingrothaus, H.V. A comparative study of double beta decay by shell model and quasiparticle RPA. Z. Physik A - Hadrons and Nuclei 339, 435–444 (1991). https://doi.org/10.1007/BF01288427
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DOI: https://doi.org/10.1007/BF01288427