Exploiting Isospin Symmetry to Study the Role of Isomers in Stellar Environments
Exploiting Isospin Symmetry to Study the Role of Isomers in Stellar Environments
复制标题
利用同位旋对称性研究异构体在恒星环境中的作用
DOI：
10.1103/physrevlett.126.042701
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发表时间：
2021
影响因子：
8.6
通讯作者：
Elman, B.
中科院分区：
文献类型：
--
作者：
Hallam, S.;Lotay, G.;Gade, A.;Doherty, D. T.;Belarge, J.;Bender, P. C.;Brown, B. A.;Browne, J.;Catford, W. N.;Elman, B.
质子捕获的激发异构态的强烈影响的丰度在爆炸性的天文事件，因此，在确定放射性的初始含量的太阳前颗粒中起着至关重要的作用。该反应也影响基态和同分异构能级之间热平衡的温度范围。我们提出了一种新的技术，利用核力的同位旋对称性，以解决长期存在的挑战，确定质子捕获率的激发核水平。这种技术具有内置测试，强烈支持其准确性，并且我们第一次通过实验限制了主导天体物理反应的共振强度。这些限制表明，该速率至少是一个因素低于先前的预期，表明恒星生产的增加和可能需要重新调查涉及的热平衡的敏感性研究。
Proton capture on the excited isomeric state ofstrongly influences the abundance ofejected in explosive astronomical events and, as such, plays a critical role in determining the initial content of radiogenicin presolar grains. This reaction also affects the temperature range for thermal equilibrium between the ground and isomeric levels. We present a novel technique, which exploits the isospin symmetry of the nuclear force, to address the long-standing challenge of determining proton-capture rates on excited nuclear levels. Such a technique has in-built tests that strongly support its veracity and, for the first time, we have experimentally constrained the strengths of resonances that dominate the astrophysicalreaction. These constraints demonstrate that the rate is at least a factorlower than previously expected, indicating an increase in the stellar production ofand a possible need to reinvestigate sensitivity studies involving the thermal equilibration of.