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$$^{180}$$Taの励起状態と$$gamma$$遷移確率の超新星ニュートリノ過程及びs過程に対する影響

Excited states and $$gamma$$-ray transition probability on $$^{180}$$Ta and its effects to supernova neutrino process and s-process

早川 岳人; 千葉 敏; 梶野 敏貴*; Mathews, G. J.*; Mohr, P.*

Hayakawa, Takehito; Chiba, Satoshi; Kajino, Toshitaka*; Mathews, G. J.*; Mohr, P.*

われわれは$$^{180}$$Taの核構造(励起状態,$$gamma$$遷移確率)及び、超新星ニュートリノ過程と遅い中性子捕獲反応過程に対する影響を議論する。$$^{180}$$Taの基底状態は約8時間の半減期でベータ崩壊するが、一方で77keVの励起エネルギーに準安定なアイソマーが存在する。恒星の中の高温な環境下では、基底状態とアイソマーは高励起状態を経由した($$gamma$$, $$gamma$$')反応によってリンクしている。

We have discuss nuclear structure of $$^{180}$$Ta, excited states and $$gamma$$ transition probabilities, and its effects to supernova neutrino nucleosynthesis and slow neutron capture reaction processes. The ground state of $$^{180}$$Ta beta decays with a half-life of about 8 hours, whereas an isomer at 77 keV is meta-stable state. In hot temperature environments in stars, the ground state and the isomer are linked through highly excited states by ($$gamma$$, $$gamma$$') reactions.

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