# Astrophysical conditions for an r-process in the high-entropy wind scenario of type II supernovae

Farouqi, K. and Freiburghaus, C. and Kratz, K. L. and Pfeiffer, B. and Rauscher, T. and Thielemann, F. K.. (2005) Astrophysical conditions for an r-process in the high-entropy wind scenario of type II supernovae. Nuclear physics. A, Nuclear and hadronic physics, Vol. 758 , S. 631C-634C.

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Official URL: http://edoc.unibas.ch/dok/A5253962

Within a full dynamical parameter study including freezeout effects, we have determined the astrophysical conditions for an r-process in the so-called neutrino-wind scenario of core-collapse type II supernovae (SNII). We have started our calculations after the total photo disintegration of the matter above the nascent neutron star at 9 (.) 101 Kelvin with protons and neutrons. We have used the charged-particle network of Thielemann and the r-process code of Freiburghaus, combined with the NON-SMOKER neutron-capture rates of Rauscher, nuclear masses from the ETFS1-Q mass model and recent experimental and theoretical gross beta-decay properties. Using the three parameters V-exp (expansion speed of the shock wave), S (entropy of the bubble) and the neutron-to-proton ratio Y-e, we show that the above quantities have to fulfill specific conditions in order to make a successful r-process. According to observations and hydrodynamical simulations, respectively, a realistic value for Vexp is 7500 km/s, and Y>0.5.