Title of article :
Astrophysical conditions for an r-process in the high-entropy wind scenario of type II supernovae Original Research Article
Author/Authors :
K. Farouqi، نويسنده , , C. Freiburghaus، نويسنده , , K.-L. Kratz، نويسنده , , B. Pfeiffer، نويسنده , , T. RAUSCHER، نويسنده , , F.-K. Thielemann، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2005
Abstract :
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 9⋅109 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 Vexp (expansion speed of the shock wave), S (entropy of the bubble) and the neutron-to-proton ratio Ye, 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 Ye<0.5.
Journal title :
Nuclear physics A
Journal title :
Nuclear physics A