Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 38: Nuclear Astrophysics
HK 38.6: Talk
Tuesday, March 17, 2009, 18:15–18:30, H-ZO 60
Extended pool of stellar electron capture rates on nuclei — •Andrius Juodagalvis1, Karlheinz Langanke2, William R. Hix3, Gabriel Martinez-Pinedo2, and Jorge M. Sampaio4 — 1VU ITPA, Vilnius, Lithuania — 2GSI, Darmstadt, Germany — 3ORNL, Oak Ridge TN, USA — 4CFNUL, Lisboa, Portugal
Nuclear physics input plays an important role in core-collapse supernova simulation. Nuclear shell model based methods reliably predict the capture rates, however, the feasibility cuts the method short. Earlier we reported on the extension of the pool of hybrid rates to 250 nuclei of pf+gds model space [1]. Here we present even more enlarged pool based on a schematic Fermi-Dirac approximation to the parent nucleus ground state occupation numbers. More than 2500 nuclei with Z=28-70 and N=40-160 are calculated within the schematic hybrid model. The NSE-averaged electron capture rate and the emitted neutrino spectra are calculated. The screening effects are taken into account both in calculation of the nuclear abundances and calculating the capture rates as well as neutrino spectra.
[1] A.Juodagalvis et al, Journ. Phys. G 35, 014031 (2008).