大质量恒星中较高的铁产量

IF 12.9 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Nature Astronomy Pub Date : 2024-12-16 DOI:10.1038/s41550-024-02457-8

Bishwanath Gaire

引用次数: 0

摘要

铁-60和铝-26是银河系内外恒星核合成产生的独特化学同位素。这些同位素的比例是理解恒星演化的一个关键参数，但已知伽马射线望远镜获得的数值与超新星模型预测的数值之间存在差异。最近，Artemis Spyrou和他的同事报告了59Fe中子俘获率的横截面，比之前认为的要高，这意味着在大质量恒星中60Fe的产量增加，这进一步加剧了差异。在他们的实验中，从放射性锰同位素（60Mn）的β衰变中产生激发铁，以便使用β-Oslo方法提取其核能级密度和伽马射线强度函数。核能级密度给出了每单位能量的能级数，作为激发能、自旋和宇称的函数，它的归一化用于固定伽马射线强度函数的斜率，这与伽马射线在特定能量和多极下发射的概率有关。结合理论计算，他们表明，在较低的能量下，伽马射线强度函数增加。这一低能特征是以往研究与本研究在核反应截面和同位素比值上存在差异的主要原因。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics

CiteScore

19.50

自引率

2.80%

发文量

252

期刊介绍： Nature Astronomy, the oldest science, has played a significant role in the history of Nature. Throughout the years, pioneering discoveries such as the first quasar, exoplanet, and understanding of spiral nebulae have been reported in the journal. With the introduction of Nature Astronomy, the field now receives expanded coverage, welcoming research in astronomy, astrophysics, and planetary science. The primary objective is to encourage closer collaboration among researchers in these related areas. Similar to other journals under the Nature brand, Nature Astronomy boasts a devoted team of professional editors, ensuring fairness and rigorous peer-review processes. The journal maintains high standards in copy-editing and production, ensuring timely publication and editorial independence. In addition to original research, Nature Astronomy publishes a wide range of content, including Comments, Reviews, News and Views, Features, and Correspondence. This diverse collection covers various disciplines within astronomy and includes contributions from a diverse range of voices.