München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 11: Theorie

HK 11.5: Vortrag

Montag, 20. März 2006, 17:30–17:45, B

Systematic analysis of the uncertainty in the 0νββ-decay nuclear matrix elements — •Vadim Rodin¹, Amand Faessler¹, Fedor Simkovic^1,2, and Petr Vogel³ — ¹Institut fuer Theoretische Physik, Universitaet Tuebingen, Auf der Morgenstelle 14, D-72076 Tuebingen, Deutschland — ²Department of Nuclear Physics, Comenius University, Mlynska dolina F1, Bratislava, Slovakia — ³Department of Physics 106-38, California Institute of Technology, Pasadena, CA 91125, USA

The discovery of neutrino oscillations has unambiguously shown that neutrinos have a non-vanishing rest-mass. The neutrinoless double beta decay (0νββ) is an experimentum crucis to reveal the Majorana nature of the neutrinos and to determine the absolute neutrino mass scale.

The determination of the Majorana mass from experimental data can be only as good as the knowledge of the nuclear matrix elements M^0ν on which the 0νββ-decay rates depend. In [1] the values of M^0ν for most nuclei with known 2νββ-decay rates are systematically evaluated using the QRPA and RQRPA. The experimental 2νββ-decay rate is used to adjust the most relevant parameter, the strength of the particle-particle interaction. The results show that with such a procedure the M^0ν’s become essentially independent on the size of the single-particle basis and on the possible quenching of the axial vector strength g_A. Theoretical arguments in favor of the adopted way of determining the interaction parameters are presented.

[1] V. A. Rodin, A. Faessler, F. Simkovic and P. Vogel, Phys. Rev. C 68 (2003) 044302; arXiv:nucl-th/0503063