<i>p</i>-核種の生成とその同位体比異常  [in Japanese] The origin of <i>p</i>-isotopes and their isotopic anomalies  [in Japanese]

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Author(s)

    • 其 魯 Lu Qi
    • 東京大学理学部化学教室:(現)電気通信大学自然科学系列(化学) Laboratory of REE Microanalysis, Department of Chemistry, Faculty of Science, The University of Tokyo: (Present address) Department of Chemistry, The University of Electro-Communications
    • 増田 彰正 MASUDA Akimasa
    • 東京大学理学部化学教室:(現)電気通信大学自然科学系列(化学) Laboratory of REE Microanalysis, Department of Chemistry, Faculty of Science, The University of Tokyo: (Present address) Department of Chemistry, The University of Electro-Communications

Abstract

The origin of <i>p</i>-isotopes (proton rich isotopes) and their isotopic anomalies are reviewed in this article. The p-isotopes (<sup>84</sup>Sr,<sup>124</sup>Xe, <sup>130</sup>Ba, <sup>144</sup>Sm, <sup>196</sup>Hg, etc.) are heavy isotopes (A≧74) which cannot be synthesized by <i>s</i>-process or <i>r</i>-process. The <i>p</i>-isotopes are considered to be produced by the transmutation of heavy elements into lighter <i>p</i>-isotopes via a series of (γ, <i>n</i>), (γ, <i>p</i>) and (γ, α) reactions in supernovae. We can constrain the site and the condition of nucleosynthesis in supernovae from abundances of the <i>p</i>-isotopes. The isotopic anomalies of the p-isotopes of Xe, Cd and Sn are found in acid residues of the Allende carbonaceous chondrite. The anomalies of <sup>84</sup>Sr and <sup>144</sup>Sm are also found in the Allende FUN inclusions. They are considered to be presolar origin. The anomalies of <sup>196</sup>Hg are found, however, their origin still remains enigmatic. The anomaly of Mo isotopic abundances is found in the Sikhote-Alin iron meteorite. The anomaly can be explained by (γ, <i>n</i>) reaction chains of Mo. The further study of the Mo anomaly will give us interesting informations not only about the <i>p</i>-process, but also about the <i>r</i>-process effect on <sup>93</sup>Nb, the double β<sup>-</sup>-decay of <sup>96</sup>Zr, and the (γ, <i>n</i>) reaction chain of <sup>99</sup>Tc.

Journal

  • Chikyukagaku

    Chikyukagaku 26(1), 41-50, 1992

    The Geochemical Society of Japan

Codes

  • NII Article ID (NAID)
    110008679863
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • ISSN
    0386-4073
  • NDL Article ID
    3780360
  • NDL Source Classification
    ME51;MB0
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    NDL  NII-ELS  J-STAGE 
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