New Fe59 Stellar Decay Rate with Implications for the Fe60 Radioactivity in Massive Stars
New Fe59 Stellar Decay Rate with Implications for the Fe60 Radioactivity in Massive Stars
复制标题
新的 Fe59 恒星衰变率对大质量恒星中 Fe60 放射性的影响
DOI：
10.1103/physrevlett.126.152701
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发表时间：
2021
影响因子：
8.6
通讯作者：
Biswas, S.
中科院分区：
文献类型：
--
作者：
Gao, B.;Giraud, S.;Li, K. A.;Sieverding, A.;Zegers, R. G. T.;Tang, X.;Ash, J.;Ayyad-Limonge, Y.;Bazin, D.;Biswas, S.
射线天文学对射线通量比的观测与最近的计算之间的差异是核天体物理学中一个未解决的难题。恒星衰变率是阻碍我们精确预测的主要核不确定性之一。首次利用电荷交换反应的独家测量方法测量了从低激发态到基态的重要Gamow-Teller强度。新的恒星衰变速率比目前采用的速率大一个因子。恒星演化计算表明，采用新的产额率，一颗质量为18太阳的星星的产额比原产额降低了40%。我们的结果消除了一个主要的核不确定性的预测产额，并澄清了现有的差异的比率。
The discrepancy between observations from-ray astronomy of the-ray flux ratio and recent calculations is an unresolved puzzle in nuclear astrophysics. The stellar-decay rate ofis one of the major nuclear uncertainties impeding us from a precise prediction. The important Gamow-Teller strengths from the low-lying states into theground state are measured for the first time using the exclusive measurement of thecharge-exchange reaction. The new stellar decay rate ofis a factor oflarger than the currently adopted rate at. Stellar evolution calculations show that theproduction yield of an 18 solar mass star is decreased significantly by 40% when using the new rate. Our result eliminates one of the major nuclear uncertainties in the predicted yield ofand alleviates the existing discrepancy of theratio.