Uncertainties in the nu p-process: supernova dynamics versus nuclear physicsReport as inadecuate



 Uncertainties in the nu p-process: supernova dynamics versus nuclear physics


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We examine how the uncertainties involved in supernova dynamics as well as in nuclear data inputs affect the nup-process in the neutrino-driven winds. For the supernova dynamics, we find that the wind termination by the preceding dense ejecta shell, as well as the electron fraction Y {e, 3}; at 3 10^9 K play a crucial role. A wind termination within the temperature range of 1.5-3 10^9 K greatly enhances the efficiency of the nu p-process. This implies that the early wind phase, when the innermost layer of the preceding supernova ejecta is still 200-1000 km from the center, is most relevant to the nup-process. The outflows with Y {e, 3} = 0.52-0.60 result in the production of the p-nuclei up to A=108 with interesting amounts. Furthermore, the p-nuclei up to A=152 can be produced if Y {e, 3} = 0.65 is achieved. For the nuclear data inputs, we test the sensitivity to the rates relevant to the breakout from the pp-chain region A 12, to the n, p rates on heavy nuclei, and to the nuclear masses along the nup-process pathway. We find that a small variation of the rates of triple-alpha and of the n, p reaction on 56Ni leads to a substantial change in the p-nuclei production. We also find that 96Pd N=50 on the nup-process path plays a role as a second seed nucleus for the production of heavier p-nuclei. The uncertainty in the nuclear mass of 82Zr can lead to a factor of two reduction in the abundance of the p-isotope 84Sr.



Author: Shinya Wanajo; Hans-Thomas Janka; Shigeru Kubono

Source: https://archive.org/







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