Dresden 2000 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 24: Kern- und Teilchen- Astrophysik II
HK 24.5: Vortrag
Donnerstag, 23. März 2000, 15:30–15:45, B 98
Stellar and nuclear-physics constraints on two r-process components in the early Galaxy — •B. Pfeiffer1, K.-L. Kratz1, U. Ott2, and F.-K. Thielemann3 — 1Institut für Kernchemie, Universität Mainz, Germany — 2MPI für Chemie, Mainz, Germany — 3Institut für Theoretische Physik, Universität Basel, Switzerland
Recent results on extinct radionuclides [1] and the elemental abundances in very metal-poor halo stars [2] provide increasing evidence for the existence of two types of the rapid neutron capture process (r-process). In order to constrain the properties of these r-processes, additional input from stellar as well as nuclear-structure models is needed. Taking advantage of our site-independent asrophysical approach [3,4] we have calculated r-process abundances in the waiting-point approximation. The stellar conditions to form different r-processes and the dominant nuclear-structure properties determining the observed abundance patterns will be discussed.
[1] Y.-Z. Qian et al., Ap. J. 494, 285 (1998)
[2] J. Westin et al., submitted to Ap. J.
[3] K.-L. Kratz et al., Ap. J. 402, 216 (1993)
[4] J.J. Cowan et al., Ap. J. 521, 194 (1999)