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arXiv 2003.05842nucl-ex
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由γ门控粒子谱得到的$^{69}$ Zn的核能级密度及其对PDMATHAAB Zn(n,$γ$)$^{69}$ Zn俘获截面的意义

Nuclear level density of $^{69}$Zn from gamma gated particle spectrum and its implication on $^{68}$Zn(n, $γ$)$^{69}$Zn capture cross-section

Rajkumar Santra, Balaram Dey, Subinit Roy, Md. S. R. Laskard, R. Palit, H. Pai, S. Rajbanshi, Sajad Alia, Saikat Bhattacharjee, F. S. Babrad, Anjali Mukherjeec,… 展开作者

Rajkumar Santra, Balaram Dey, Subinit Roy, Md. S. R. Laskard, R. Palit, H. Pai, S. Rajbanshi, Sajad Alia, Saikat Bhattacharjee, F. S. Babrad, Anjali Mukherjeec, S. Jadhavd, Balaji S Naidud, Abraham T. Vazhappillyd, Sanjoy Pald

摘要:

蒸发的$α$ -能谱与来自产生$^{73}$ Ge复合核的反应$^{64}$ Ni($^9$ Be,$α$ n)$^{68}$ Zn中的残留核$^{68}$ Zn的低能离散$γ$ -能谱相符合.首次用低能$γ$门控$α$粒子谱提取了激发能E $\approx$ 5-20 MeV的中间态$^{69}$ Zn核的能级密度(NLD). NLD的斜率作为$^{69}$ Zn的激发能的函数与从RIPL估计的NLD在低能量和从中子共振数据的NLD确定的斜率很好地匹配。提取的逆NLD参数(k = A/ $\widetilde{a}$)已被用于确定$^{69}$ Zn在中子分离能$S_n$处的核能级密度参数值$a$。然后,使用反应代码TDELS中导出的$a(S_n)$,估计作为中子能量的函数的$^{68}$ Zn(n,$γ$)俘获反应的总截面。计算结果表明,中子俘获截面的估算值与实验值吻合较好。结果表明,实验导出的核能级密度参数可以约束天体物理俘获截面的统计模型描述,优化与天体物理反应率相关的不确定性

英文摘要:

Evaporated $α$-spectra have been measured in coincidence with low energy discrete $γ$-rays from residual nucleus $^{68}$Zn populated in the reaction $^{64}$Ni($^9$Be,$α$n)$^{68}$Zn at $E(^9$Be) = 30 MeV producing $^{73}$Ge compound nucleus. Low energy $γ$-gated $α$-particle spectra, for the first time, have been used to extract the nuclear level density (NLD) for the intermediate $^{69}$Zn nucleus in the excitation energy range of E $\approx$ 5-20 MeV. The slope of NLD as a function of excitation energy for $^{69}$Zn matches nicely with the slope determined from RIPL estimates for NLD at low energies and the NLD from neutron resonance data. Extracted inverse NLD parameter (k = A/$\widetilde{a}$) has been used to determine the nuclear level density parameter value $a$ at neutron separation energy $S_n$ for $^{69}$Zn. Total cross-section of $^{68}$Zn(n,$γ$) capture reaction as a function of neutron energy is then estimated employing the derived $a(S_n)$ in the reaction code TALYS. It is found that the estimated neutron capture cross-section agrees well with the available experimental data without any normalization. The present result indicates that experimentally derived nuclear level density parameter can constrain the statistical model description of astrophysical capture cross-section and optimize the uncertainties associated with the astrophysical reaction rate

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