Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Nukleare Astrophysik

HK 21.6: Vortrag

Montag, 4. März 2013, 18:15–18:30, HSZ-403

Systematics of netrinoless double beta decay matrix elements in a major shell — •Tomas Rodriguez — Technische Universität Darmstadt, Darmstadt, Germany

We analyze nuclear matrix elements (NME) of neutrinoless double beta decay calculated for the Cadmium isotopes. Energy density functional methods including beyond mean field effects such as symmetry restoration and shape mixing are used. Strong shell effects are found associated to the underlying nuclear structure of the initial and final nuclei. Furthermore, we show that NME for two-neutrino double beta decay evaluated in the closure approximation, M_cl^2ν, display a constant proportionality with respect to the Gamow-Teller part of the neutrinoless NME, M_GT^0ν. This opens the possibility of determining the M_GT^0ν matrix elements from β^∓ Gamow-Teller strength functions. Finally, the interconnected role of deformation, pairing, configuration mixing and shell effects in the NMEs is discussed.