Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 27: Theorie IV
HK 27.5: Vortrag
Mittwoch, 19. März 2003, 12:00–12:15, E
Double beta decay calculations and nuclear structure models — •Vadim Rodin1, Amand Faessler1, Fedor Šimkovic1,2, Charalampos Moustakidis1, and Larisa Pacearescu1 — 1Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany — 2Department of Nuclear Physics, Comenius University, Mlynská dolina F1, Bratislava, Slovakia
The two-neutrino nuclear double-beta decay is the rarest decay process observed in nature. It can be considered a testing laboratory for the theoretical nuclear models aiming description of the neutrinoless nuclear double-beta decay. Observation of the latter would give unambiguous evidence for new physics beyond the standard model (see, e.g. [1] and references therein).
The transition amplitude of the two-neutrino nuclear double-beta decay calculated within QRPA is sensitive to neutron-proton correlations of the particle-particle type and a collapse of the amplitude can occur for realistic values of the model parameters [1]. Therefore, the calculation of the two-neutrino nuclear double-beta decay rates should involve all the modern machinery of the nuclear structure theory (account for nuclear deformation, p−n pairing effects etc.). In the recent work [2] QRPA has been reformulated into more consistent Fully-Renormalized QRPA. In our talk we give a summary of the calculation results for the two-neutrino nuclear double-beta decay.
[1] A. Faessler and F. Šimkovic, J. Phys. G 24 (1998) 2139
[2] Vadim Rodin and Amand Faessler, Phys. Rev. C 66 (2002) 051303(R)