Darmstadt 2008 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Kern- und Teilchen-Astrophysik
HK 24.6: Vortrag
Dienstag, 11. März 2008, 12:45–13:00, 2B
shell-model half-lives for N=82 nuclei and their implications for the r-process — •Jose Cuenca-Garcia1, Gabriel Martinez-Pinedo1, Karl-Heinz Langanke1,2, Ivan Borzov1, and Frederic Nowacki3 — 1Geselschaft für Schwerionenforschung Plankstr. 1 64259 Darmstadt — 2Institut für Kernphysik TU-Darmstadt Schlossgartenstr. 9 64289 — 3Institut de Rechernes Subatomiques, Université Louis Pasteur 67097 Strasbourg, France
We have performed shell-model calculations of the half-lives and neutron-branching probabilties of the r-process waiting point nuclei at the magic neutron number N = 82. These new calculations use a larger model space than previous shell model studies and an improved residual interaction which is adjusted to recent spectroscopic data around A = 130. Our shell-model results give a good account of all experimentally known half-lives and Q-values for the N = 82 r-process waiting point nuclei. Our half-life predictions for the N = 82 nuclei with Z = 42*46 agree well with recent estimates based in the energy-density functional method.