超新星での元素合成とニュートリノ振動  [in Japanese] Nucleosynthesis in Supernovae and Neutrino Oscillation  [in Japanese]

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Author(s)

Abstract

超新星における^7Li,^<11>B,^<138>La,^<180>Ta等の元素合成には,ニュートリノ-原子核反応過程が重要な役割を果たす.最近の中性子過剰核を中心とした原子核物理の発展に基づいて新しい殻模型ハミルトニアンを構築し,原子核のスピン応答の記述を改善した.新しいハミルトニアンをニュートリノ-原子核反応断面積の理論計算に適用することによって,超新星で合成される^7Li,^<11>B等の軽元素合成量のより正確な評価が可能となった.物質振動(MSW)効果によって元素合成量がニュートリノ混合角θ_<13>と質量階層に強く依存することを利用して,我々は未知のニュートリノ振動パラメータを決定する新しい方法を提案した.

Neutrino-nucleus reaction processes play important roles in synthesis of ^7Li, ^<11>B,^<138>La, ^<180>Ta and other elements in explosive environments realized in supernovae. We have constructed new shell model Hamiltonians based on recent progress of physics in unstable nuclei near the neutron drip-line. The spin responses of nuclei are found to be remarkably improved by the new Hamiltonians. We then applied these Hamiltonians to calculate the neutrino-nucleus reaction cross sections, and obtained more precise and reliable theoretical estimate of supernova nucleosynthesis of ^7Li, ^<11>B, etc. including the neutrino processes. Finally we propose a new method to determine unknown neutrino oscillation parameters, namely the mixing angle θ_<13> and the mass hierarchy, by making use of strong dependence of the yields of ^7Li and <11>B on these parameters.

Journal

  • 日本物理學會誌

    日本物理學會誌 67(1), 49-54, 2012-01-05

    The Physical Society of Japan (JPS)

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Codes

  • NII Article ID (NAID)
    110008898006
  • NII NACSIS-CAT ID (NCID)
    AN00196952
  • Text Lang
    JPN
  • Article Type
    REV
  • ISSN
    00290181
  • NDL Article ID
    023360260
  • NDL Call No.
    Z15-13
  • Data Source
    CJP  NDL  NII-ELS 
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