Physics – Nuclear Physics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005nupha.758..631f&link_type=abstract
Nuclear Physics A, Volume 758, p. 631-634.
Physics
Nuclear Physics
6
Scientific paper
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 photodisintegration of the matter above the nascent neutron star at 9ṡ10 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 ETFSI-Q mass model and recent experimental and theoretical gross β-decay properties. Using the three parameters V (expansion speed of the shock wave), S (entropy of the bubble) and the neutron-to-proton ratio Y, 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 V is 7500 km/s, and Y<0.5.
Farouqi Khalil
Freiburghaus Ch.
Kratz Karl Ludwig
Pfeiffer Bernd
Rauscher Thomas
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