Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 73: Nuclear Astrophysics

HK 73.5: Vortrag

Donnerstag, 19. März 2009, 17:45–18:00, H-ZO 60

Beta decay and muon capture rates in a self-consistent relativistic framework — •Tomislav Marketin¹, Nils Paar¹, Tamara Nikšić¹, Dario Vretenar¹, and Peter Ring² — ¹Physics Department, Faculty of Science, University of Zagreb, Croatia — ²Physik-Department der Technischen Universität München, D-85748 München, Germany

A fully consistent calculation of muon capture and beta decay rates is presented, based on a microscopic theoretical framework describing the semileptonic weak interaction processes. Nuclear ground state is determined using the Relativistic Hartree-Bogoliubov (RHB) model with density dependent meson-nucleon coupling constants, and transition rates are calculated via proton-neutron relativistic quasiparticle RPA using the same interaction as in the RHB equations. Muon capture rates are calculated for a wide range of nuclei along the valley of stability, from ¹²C to ²⁴⁴Pu, with accuracy of approximately 30%, using the interaction DD-ME2[1]. Previous studies of beta decay rates have only taken into account Gamow-Teller transitions[2]. We extend this approach by including forbidden transitions and systematically study their contribution to decay rates of exotic nuclei along the r-process path, which are important for constraining the conditions in which nucleosynthesis takes place.

[1] T. Marketin, N. Paar, T. Nikšić and D. Vretenar, submitted to Phys. Rev. C (2008) (arXiv:nucl-th\0812.1947).

[2] T. Marketin, D. Vretenar and P. Ring, Phys. Rev. C 75, 024304 (2006).