München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 26: Kern- und Teilchen-Astrophysik
HK 26.5: Vortrag
Dienstag, 21. März 2006, 18:00–18:15, E
Neutrino nucleosynthesis of the exotic nuclei 138La and 180Ta by charged current reactions* — •A. Byelikov1, T. Adachi2, P. von Brentano3, D. Frekers4, D. De Frenne5, H. Fujita6, Y. Fujita2, A. Heger7, E. Jakobs5, Y. Kalmykov1, K. Langanke8, E. Kolbe9, A. Negret5, P. von Neumann-Cosel1, L. Popescu5, S. Rakers4, A. Richter1, A. Shevchenko1, and Y. Shimbara2 — 1TU Darmstadt — 2Osaka University — 3Universität zu Köln — 4Universität Münster — 5Universiteit Gent — 6University of Witwatersrand — 7Los Alamos — 8GSI — 9Universität Basel
The origin of the exotic isotopes 138La
and 180Ta is an open question so far. The latest calculations
[1] with detailed modelling of nucleosynthesis in massive stars
>10M⊙ predict a significant production through charged
current reactions (νe,e) on 138Ba and 180Hf,
respectively. The cross sections at low energies in the daughter
nuclei are dominated by GT transitions. The GT response could be
measured in high resolution 138Ba,180Hf(3He,t)
experiments under zero degree. The talk presents the final
experimental results and discusses their astrophysical relevance.
A. Heger et al., Phys. Lett. B606 (2005) 258
*Supported by the DFG through SFB 634 and 446 JAP-113/267/0-1.