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arXiv 1608.05037nucl-thastro-ph.HEastro-ph.SR
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核子-核子韧致辐射率对单π交换的影响

Impact of Nucleon-Nucleon Bremsstrahlung Rates Beyond One-Pion Exchange

Alexander Bartl, Robert Bollig, Hans-Thomas Janka, Achim Schwenk

摘要:

目前的超新星模拟中,核子-核子韧致辐射产生和湮灭中子对的速率是基于一π介子交换近似。在这里,我们探讨了基于现代核相互作用的韧致辐射率对原中子星冷却和相应的中微子发射的影响。我们发现,尽管在中微子层区域的韧致辐射的排放减少了2-5倍,模型与改进的治疗表现出只有$\lesssim$ 5%的变化的中微子光度和$\lesssim$ 0.7兆电子伏的辐射中微子光谱的平均能量的增加,与最大的影响的反中微子的所有风味和在后期。总的来说,原中子星冷却演化被适度地减慢了$\lesssim$ 0.5-1 s.

英文摘要:

Neutrino-pair production and annihilation through nucleon-nucleon bremsstrahlung is included in current supernova simulations by rates that are based on the one-pion-exchange approximation. Here we explore the consequences of bremsstrahlung rates based on a modern nuclear interactions for proto-neutron star cooling and the corresponding neutrino emission. We find that despite a reduction of the bremsstrahlung emission by a factor of 2-5 in the neutrinospheric region, models with the improved treatment exhibit only $\lesssim$5% changes of the neutrino luminosities and an increase of $\lesssim$0.7 MeV of the average energies of the radiated neutrino spectra, with the largest effects for the antineutrinos of all flavors and at late times. Overall, the proto-neutron star cooling evolution is slowed down modestly by $\lesssim$0.5-1 s.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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