Influence of nuclear physics inputs and astrophysical conditions on the Th/U chronometer
Influence of nuclear physics inputs and astrophysical conditions on the Th/U chronometer
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核物理输入和天体物理条件对 Th/U 天文钟的影响
DOI：
10.1103/physrevc.80.065806
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发表时间：
2009-12
影响因子：
3.1
通讯作者：
Sun, Baohua
中科院分区：
文献类型：
--
作者：
Niu, Zhongming;Meng, Jie;Sun, Baohua
钍和铀的生产是 r 过程核宇宙年代学的关键成分。结合改进的核数据和恒星数据，我们基于经典的 r 过程方法，对金属贫乏晕恒星中的 r 过程丰度模式进行了详细研究。结果发现，结果几乎独立于对观测丰度的指定模拟。核质量不确定性对 Th/U 天文钟的影响可能接近 2 Gyr。此外，贫金属恒星HE 1523-0901、CS 31082-001和BD +17度的年龄。 3248 分别确定为 11.8{+-}3.7、13.5{+-}2.9 和 10.9{+-}2.9 Gyr。结果可以作为对宇宙年龄估计的独立检查。
The productions of thorium and uranium are key ingredients in r-process nucleo-cosmochronology. With the combination of improved nuclear and stellar data, we have made a detailed investigation of the r-process abundance pattern in the very metal-poor halo stars based on the classical r-process approach. It is found that the results are almost independent of specified simulations to observed abundances. The influence from nuclear mass uncertainties on a Th/U chronometer can approach 2 Gyr. Moreover, the ages of the metal-poor stars HE 1523-0901, CS 31082-001, and BD +17 deg. 3248 are determined as 11.8{+-}3.7, 13.5{+-}2.9, and 10.9{+-}2.9 Gyr, respectively. The results can serve as an independent check for age estimates of the Universe.