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arXiv 0912.1669nucl-thastro-ph.SR
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核物理输入和天体物理条件对Th/U计时器的影响

Influence of nuclear physics inputs and astrophysical conditions on Th/U chronometer

Zhongming Niu, Baohua Sun, Jie Meng

摘要:

钍和铀的产生是$r$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,对贫金属晕星的$r$过程丰度模式进行了详细的研究。结果发现,结果几乎是独立的指定的模拟观测丰度。核质量不确定度对Th/U计时器的影响可达2 Gyr。此外,贫金属星HE 1523-0901、CS 31082-001和BD +17 $^\circ$ 3248的年龄分别被确定为$11.8\pm 3.7$、$13.5\pm 2.9$和$10.9 \pm 2.9$ Gyr。这些结果可以作为宇宙年龄估计的独立检验。

英文摘要:

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 detailed investigations on 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 Th/U chronometer can approach 2 Gyr. Moreover, the ages of the metal-poor stars HE 1523-0901, CS 31082-001, and BD +17$^\circ$3248 are determined as $11.8\pm 3.7$, $13.5\pm 2.9$, and $10.9 \pm 2.9$ Gyr, respectively. The results can serve as an independent check for age estimate of the universe.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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