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Examination of the R-process in accretion-induced collapse (AIC).

机译:在增生引起的塌陷(AIC)中检查R过程。

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摘要

This work is a simulation of the Accretion-Induced Collapse of a 1.37 solar mass white dwarf into a neutron star and the subsequent generation of a neutrino-driven wind, with an examination as to whether the event is a candidate for r-process nucleosynthesis. The simulation utilizes a new radiation hydrodynamic code, RadHyd, to model the AIC event.; We examine the process of Accretion-Induced Collapse utilizing two sets of neutrino-scattering and absorption rates: The first, and simpler of the two has been in use since they were first introduced in 1985. The second includes a more accurate implementation of neutrino-nucleon scattering and nucleon bremsstrahlung. The improved nue - nue-nucleon scattering rate now permits energy to be exchanged between neutrinos and matter by this process, and is therefore important for the numu's and nutau's, as their only channels for exchanging energy in the standard rates was by the relatively weak NES and pair processes. Neutrino-nucleon bremmsstrahlung is also important for numu's and nutau's as this opens another channel (beside pair process) for their production.; Both simulations show a neutrino-driven wind being generated after core bounce and shock propagation. We examine the conditions in these winds to ascertain whether the requisite conditions are attained for an r-process. In neither case are these achieved during the time of the simulations (i.e. 2 seconds). However, these simulations need to be carried out at least an order of magnitude longer before firm conclusions can be drawn about the applicability of this site for the r-process.
机译:这项工作是对1.37太阳质量的白矮星向中子星的增生诱发塌陷以及随后中微子驱动风的产生的模拟,并检验了该事件是否是r过程核合成的候选者。该模拟利用新的辐射流体动力学代码RadHyd对AIC事件进行建模。我们利用两组中微子的散射和吸收速率研究了吸积诱发的坍塌过程:自1985年首次引入以来,这两种方法中的第一种和较简单的方法一直在使用。第二种方法包括更精确地实现中微子核子散射和核子致辐射。改进的nue-nue-核子散射速率现在允许通过此过程在中微子和物质之间交换能量,因此对numu和nutau的重要,因为它们以标准速率交换能量的唯一渠道是相对较弱的NES和配对过程。中微子核致对numu和nutau也很重要,因为这为生产提供了另一个渠道(除了配对过程之外)。两种模拟都显示了在中子弹跳和激波传播后产生了由中微子驱动的风。我们检查这些风中的条件,以确定是否满足r过程的必要条件。在仿真期间(即2秒),这两种情况均无法实现。但是,在得出关于该部位对r加工的适用性的可靠结论之前,至少需要将这些模拟至少进行一个数量级。

著录项

  • 作者

    Davis, Daryl C.;

  • 作者单位

    Florida Atlantic University.;

  • 授予单位 Florida Atlantic University.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 159 p.
  • 总页数 159
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

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