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The r-process element abundance with a realistic fission fragment mass distribution

現実的な核分裂生成物分布を用いたr過程元素分布

千葉 敏; 小浦 寛之 ; 丸山 敏毅; 太田 雅久*; 龍田 早由*; 和田 隆宏*; 橘 孝博*; 住吉 光介*; 大槻 かおり*; 梶野 敏貴*

Chiba, Satoshi; Koura, Hiroyuki; Maruyama, Toshiki; Ota, Masahisa*; Tatsuda, Sayuki*; Wada, Takahiro*; Tachibana, Takahiro*; Sumiyoshi, Kosuke*; Otsuki, Kaori*; Kajino, Toshitaka*

r過程元素合成における$$beta$$遅延核分裂の効果を調べた。2中心殻模型とランジュバン方程式を用いて、r過程で生成される核分裂性核種の核分裂生成物分布を計算した。さらに、$$beta$$崩壊率(非粒子放湿、中性子放出と$$beta$$遅延核分裂)を大局的理論により計算した。核分裂の有無によるr過程元素合成分布の違いや、核分裂によって影響を受ける領域における分布の様相について議論する。

Effect of the $$beta$$-delayed fission in r-process abundance is investigated. The data base for the fission fragment mass distribution used in the r-process network calculation is constructed based on the 2-center shell model and Langevinequation. The $$beta$$-decay rates (no emissive, neutron emission and $$beta$$-delayed fission) are also newly calculated with the gross theory. The differences appeared in the final element abundance calculated with and without fission process are demonstrated and the mass region modified by the fission products is presented.

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