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2020 年度 実績報告書

始原的宇宙磁場揺らぎのビッグバン元素合成への効果及び宇宙論的磁場進化の考察

研究課題

研究課題/領域番号 19J22167
研究機関国立天文台

研究代表者

LUO Yudong  国立天文台, 科学研究部, 特別研究員(PD)

研究期間 (年度) 2019-04-25 – 2022-03-31
キーワードr-process
研究実績の概要

In this year, I estimated the screening potential as well as the changes in weak interaction rates at high field, it is found that high fields can result in the increased beta-decay rates as the electron and positron spectra are dominated by Landau levels. The effects studied here are evaluated in a simple r-process model. We found that the explosive nucleosynthesis of r-process elements could finally provide an observational signal for such a strong magnetic field through the screening effect on the weak electron-capture rates affected by Landau quantization theoretically. This work is published on the Astrophysical Journal.

現在までの達成度 (区分)
現在までの達成度 (区分)

2: おおむね順調に進展している

理由

This year, I extended my previous study to the strongly magnetized plasma. The screening potential could be much enhanced there. I also attended an international collaboration to study the Thomas-Fermi length inside the magnetohydrodynamical-Jet supernovae. Such an experience could benefit for the future development of my research to communicate with other researchers.

今後の研究の推進方策

I will continue my study on the magnetized degenerate astrophysical plasma. I apply a relativistic Hartree self-consistent field method to calculate the screening potential and applied a profile from a 15 solar mass progenitor in order to evaluate the electron-capture rates of iron group nuclei 54Fe and 70Zn. I find that the screening potential in the high field is enhanced compared with the previous study. If the field is high enough and only the lowest Landau level is allowed, I find two orders of magnitude reduction in the electron capture rates in the high-density region. Such deviations of the 54Fe and 70Zn electron capture rates are essential since these two isotopes determine the neutron richness of the progenitor model as well as the iron core mass, which are crucial for supernovae explosion calculation. The reduction of electron capture rates of heavy nuclei under strongly magnetized degenerated plasma could also potentially deviate the neutrino absorption rate and the neutrino emission spectrum. Currently, I am preparing for the submission of the manuscript.

  • 研究成果

    (1件)

すべて 2020

すべて 雑誌論文 (1件)

  • [雑誌論文] Nuclear Reaction Screening, Weak Interactions, and r-process Nucleosynthesis in High Magnetic Fields2020

    • 著者名/発表者名
      Famiano Michael、Balantekin A. Baha、Kajino T.、Kusakabe M.、Mori K.、Luo Y.
    • 雑誌名

      The Astrophysical Journal

      巻: 898 ページ: 163~163

    • DOI

      10.3847/1538-4357/aba04d

URL: 

公開日: 2022-12-28  

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