Supernovae as the Site of the r-Process: Implications for Gamma-Ray Astronomy
Supernovae as the Site of the r-Process: Implications for Gamma-Ray Astronomy
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DOI：
10.1086/306285
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发表时间：
1998-03
期刊：
影响因子：
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通讯作者：
Y. Qian;P. Vogel;G. Wasserburg
中科院分区：
文献类型：
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作者：
Y. Qian;P. Vogel;G. Wasserburg
我们讨论了检测 r 过程核衰变产生的伽马射线发射如何提高我们对 r 过程核合成的理解。我们发现，在 Eγ ≈ 100-700 keV 时灵敏度为 ~10-7γ cm-2 s-1 的伽马射线探测器可以探测到未来银河系超新星中产生的 125Sb、137Cs、144Ce、155Eu 和 194Os 衰变产生的发射。此外，这样的探测器可以确定船帆座超新星遗迹中 126Sn 衰变产生的发射，以及我们银河系中过去超新星产生的 126Sn 衰变产生的漫射发射。所需的探测器灵敏度与拟议的高能核天体物理先进望远镜（ATHENA）的预计灵敏度相似。对未来银河系超新星中产生的几个 r 过程核（例如 125Sb 和 194Os）衰变发射的伽马射线的检测，以及对船帆座超新星遗迹中 126Sn 衰变发射的检测都将证明超新星是 r 过程的一个场所。此外，前一种检测将使我们能够确定 r 过程核是否按超新星 r 过程事件中太阳 r 过程丰度模式指定的相对比例产生。最后，对银河系中 126Sn 衰变的漫射发射的检测将消除中子星-中子星合并作为质量数 A ~ 126 附近 r 过程核的主要来源。
We discuss how detection of gamma-ray emission from the decay of r-process nuclei can improve our understanding of r-process nucleosynthesis. We find that a gamma-ray detector with a sensitivity of ~10-7γ cm-2 s-1 at Eγ ≈ 100-700 keV may detect the emission from the decay of 125Sb,137Cs,144Ce,155Eu, and 194Os produced in a future Galactic supernova. In addition, such a detector may determine the emission from the decay of 126Sn in the Vela supernova remnant and the diffuse emission from the decay of 126Sn produced by past supernovae in our Galaxy. The required detector sensitivity is similar to what is projected for the proposed Advanced Telescope for High Energy Nuclear Astrophysics (ATHENA). Both the detection of gamma-ray emission from the decay of several r-process nuclei (e.g.,125Sb and 194Os) produced in future Galactic supernovae and the detection of emission from the decay of 126Sn in the Vela supernova remnant would prove that supernovae are a site of the r-process. Furthermore, the former detection would allow us to determine whether or not the r-process nuclei are produced in relative proportions specified by the solar r-process abundance pattern in supernova r-process events. Finally, detection of diffuse emission from the decay of 126Sn in our Galaxy would eliminate neutron star-neutron star mergers as the main source for the r-process nuclei near mass number A ~ 126.