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 (ν_e,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.