arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2302.09845nucl-thnucl-ex
收藏

入射和发射低能$α$粒子的光学势。III。中子在Zr、Nb和Mo核上引起的非统计过程

Optical potential for incident and emitted low-energy $α$ particles. III. Non-statistical processes induced by neutrons on Zr, Nb, and Mo nuclei

Marilena Avrigeanu, Vlad Avrigeanu

备注：
21 pages, 16 figures
发表信息：
Phys. Rev. C 107, 034613 (2023)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

对于发射的$α$粒子，以及对于Zn同位素上的质子诱导反应，证明了先前的$α$ -粒子光学模型势（OMP）对质量数为45的核的可靠性$\leq$ $A$ $\leq$ 209 [Phys. Rev. C { \bf 91}，064611（2015），Paper I]。然而，Zr稳定同位素上的中子的情况并非如此[Phys. Rev. C { \bf 96}，044610（2017），Paper II]。最近的一项评估也为核子-诱导$α$ -发射$A$ $\sim$ 60核，包括拾取直接反应和最终的巨四极共振（GQR）$α$ -发射，完成了中子入射到Zr，Nb和Mo稳定同位素。涉及通过独立数据分析确定的一致输入参数集，而不涉及$γ$和核子宽度的进一步经验重标因子。通过仔细的不确定性分析来确认所有竞争性反应通道的适当帐户，以避免参数模糊性和/或误差补偿。最近测量的Zr和Mo核的$(α,γ)$和$(α,n)$截面也支持这种潜力的进一步验证。通过考虑拾取直接相互作用和{ \it like}-GQR衰变的额外反应通道，$α$ -发射的增加超过统计预测，使得通过相同的光学势描述$α$粒子的吸收和发射成为可能。

英文摘要：

The reliability of a previous $α$-particle optical-model potential (OMP) on nuclei with mass number 45$\leq$$A$$\leq$209 was proved for emitted $α$ particles as well, for proton--induced reactions on Zn isotopes [Phys. Rev. C {\bf 91}, 064611 (2015), Paper I]. However, the same was not the case of neutrons on Zr stable isotopes [Phys. Rev. C {\bf 96}, 044610 (2017), Paper II]. A recent assessment of this potential also for nucleon--induced $α$-emission on $A$$\sim$60 nuclei, including pickup direct reaction and eventual Giant Quadrupole Resonance (GQR) $α$-emission, is completed for neutrons incident on Zr, Nb, and Mo stable isotopes. Consistent sets of input parameters, determined through analysis of independent data, is involved while no further empirical rescaling factors of the $γ$ and nucleon widths have been involved. A suitable account of all competitive reaction channels is confirmed by careful uncertainty analysis, to avoid parameter ambiguities and/or error compensation. Additional validation of this potential is also supported by recently measured $(α,γ)$ and $(α,n)$ cross--sections of Zr and Mo nuclei. An increase of the $α$-emission beyond the statistical predictions, through consideration of additional reaction channels of the pickup direct interaction and {\it like}--GQR decay, makes possible the description of both absorption and emission of $α$ particles by the same optical potential.

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。

↑