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arXiv 1704.00554nucl-th
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r过程计算中超重核的Fission性质

Fission properties of superheavy nuclei for r-process calculations

Samuel A. Giuliani, Gabriel Martinez-Pinedo, Luis M. Robledo

摘要:

我们计算了一组新的静态裂变性质适合r-过程计算。采用自洽平均场方法,采用Spona-Catania-Paris-Madrid能量密度泛函,计算了超重区3640个核的势能面和集体惯性。裂变路径计算作为四极矩的函数,通过最小化势能和探索八极和十六极变形。自发裂变寿命的评估采用不同的计划集体惯性和振动能量修正。这允许探索的灵敏度的寿命,这些数量连同集体基态能量沿超重景观。我们用统计方法计算了与r过程核合成相关的中子诱导恒星反应速率,并研究了集体惯性的影响。不同的反应通道,包括中子诱导率,自发裂变和α衰变之间的竞争进行了讨论,为典型的r-过程的条件。

英文摘要:

We computed a new set of static fission properties suited for r-process calculations. The potential energy surfaces and collective inertias of 3640 nuclei in the superheavy region are obtained from Self-Consistent Mean-Field calculations using the Barcelona-Catania-Paris-Madrid energy density functional. The fission path is computed as a function of the quadrupole moment by minimizing the potential energy and exploring octupole and hexadecapole deformations. The spontaneous fission lifetimes are evaluated employing different schemes for the collective inertias and vibrational energy corrections. This allows to explore the sensitivity of the lifetimes to those quantities together with the collective ground state energy along the superheavy landscape. We computed neutron induced stellar reaction rates relevant for r-process nucleosynthesis using the statistical approach and study the impact of collective inertias. The competition between different reaction channels including neutron induced rates, spontaneous fission and alpha decay is discussed for typical r-process conditions.

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