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arXiv 1210.0680nucl-thastro-ph.SRnucl-ex
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$β$ -丰中子核的衰变半衰期和$r$ -过程中的物质流

$β$-decay half-lives of neutron-rich nuclei and matter flow in the $r$-process

Z. M. Niu, Y. F. Niu, H. Z. Liang, W. H. Long, T. Nikšić, D. Vretenar, J. Meng

摘要:

基于球相对论Hartree-Fock-Bogoliubov(RHFB)框架,采用新发展的完全自洽质子-中子准粒子无规相位近似(QRPA),系统地研究了含$20 \leqslant Z \leqslant 50$的丰中子核的$β$衰变半衰期.通过在RHFB+QRPA模型的同位旋通道中加入同位旋相关的质子-中子对相互作用,再现了现有的数据。利用计算的丰中子核$β$衰变半衰期预测了$r$物质流的显著加速。这导致了增强的$r$过程元素丰度与$A \gtrsim 140$,一个重要的结果,为理解宇宙中重元素的起源。

英文摘要:

The $β$-decay half-lives of neutron-rich nuclei with $20 \leqslant Z \leqslant 50$ are systematically investigated using the newly developed fully self-consistent proton-neutron quasiparticle random phase approximation (QRPA), based on the spherical relativistic Hartree-Fock-Bogoliubov (RHFB) framework. Available data are reproduced by including an isospin-dependent proton-neutron pairing interaction in the isoscalar channel of the RHFB+QRPA model. With the calculated $β$-decay half-lives of neutron-rich nuclei a remarkable speeding up of $r$-matter flow is predicted. This leads to enhanced $r$-process abundances of elements with $A \gtrsim 140$, an important result for the understanding of the origin of heavy elements in 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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