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HK: Physik der Hadronen und Kerne

HK 40: Theorie

HK 40.4: Vortrag

Mittwoch, 9. März 2005, 15:00–15:15, TU MA005

Description of the double beta decay within continuum QRPA — •Vadim Rodin and Amand Faessler — Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Deutschland

Observation of the neutrinoless double beta decay (0νββ) can provide important information on the Majorana nature of the neutrinos and on their absolute mass scale [1]. It is crucial that the determination of the effective Majorana mass from experimental data can be only as good as the knowledge of the nuclear matrix elements M_0ν to which the 0νββ-decay rates are proportional. Thus, to interpret the data accurately one will need to better understand the nuclear structure effects important for the description of the matrix elements.

In the present work a continuum QRPA (CQRPA) approach is applied for the first time to calculate 0νββ and 2νββ nuclear matrix elements. Correct description of highly excited nuclear states provided by CQRPA is found to have appreciable effect on high-multipole contribution to M_0ν. The calculation results are compared with those [2] obtained recently within the standard QRPA.

[1] A. Faessler and F. Šimkovic, J. Phys. G 24 (1998) 2139

[2] V. A. Rodin, A. Faessler, F. Simkovic and P. Vogel, Phys. Rev. C 68 (2003) 044302