München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 26: Kern- und Teilchen-Astrophysik
HK 26.2: Vortrag
Dienstag, 21. März 2006, 17:15–17:30, E
Isomers along the rp-process path and 1st experiments — •Timo Griesel1,2, Andreas Wöhr2, Ani Aprahamian2, Plamen Boutachkov2, and Karl-Ludwig Kratz1,2 — 1Kernchemie Mainz, HGF-VISTARS, Mainz Germany — 2ISNAP, Univ. of Notre Dame, JINA, Notre Dame, USA
Accretion disks of binary star systems are thought to have the right density and temperature conditions to ignite a thermonuclear runaway of rapid-proton (rp-process) and alpha capture reactions leading to the synthesis of proton rich nuclei. The recent observation of a low energy shape isomer in the even-even self-conjugated N=Z nuclei 72Kr has given some indication for potential new pathways for the rp-process reaction path in bypassing waiting points. Similar shape isomers have been predicted for the N=Z waiting point nuclei 68Se and 64Ge. A series of experiments to search for isomers has started at ISNAP at the Univ. of Notre Dame. First tests via the reactions 54Fe(12C,2n)64Ge and 56Ni(12C,2n)68Se were made. To identify the isotopes 64Ge and 68Se, n-g coincidences were measured.
A status report on the measurements and data analysis will be given.
This work was supported by NSF (Notre Dame, JINA) and HGF-Vistars.