我们列出了从$^{16}$ O到$A=339$的9318个核的原子质量过剩和结合能、基态壳层加配对修正、基态微观修正和核基态形变。计算是基于有限范围液滴宏观模型和折叠汤川单粒子微观模型。相对于我们在{ \sc Atomic Data and Nuclear Data Tables} [{ \bf 59} 185(1995)]中的FRDM(1992)质量表,结果是在相同的模型中得到的,但由于计算机能力的限制,变形处理得到了相当大的改进,而且以前所需的近似也减少了。更准确地执行的模型和更广泛和更准确的实验质量数据库,现在可以让我们来确定一个额外的宏观模型参数,密度对称系数$L$,这是没有变化,在以前的计算,但设置为零。因为我们现在认识到,FRDM对于裂变中发生的一些高度变形的形状是不准确的,因为一些效应是根据围绕球体的微扰导出的,所以我们只将其宏观参数调整为基态质量。10个常数的值是直接从一个优化来确定的,以拟合从$^{16}$ 0到$^{265}_{106}$ Sg和$^{264}_{108}$ Hs的2149个核的基态质量。质量模型的误差为0.5595 MeV。我们还提供了FRLDM中的质量,在更精确的处理中,现在的误差为0.6618 MeV。但与FRDM不同的是,它适合于裂变的研究,并已被广泛应用于其他地方,FRLDM(2002)常数。FRLDM(2012)拟合了从$^{70}$ Se到$^{252}$ Cf的31个裂变势垒高度,均方根偏差为1.052 MeV。
英文摘要:
We tabulate the atomic mass excesses and binding energies, ground-state shell-plus-pairing corrections, ground-state microscopic corrections, and nuclear ground-state deformations of 9318 nuclei ranging from $^{16}$O to $A=339$. The calculations are based on the finite-range droplet macroscopic model and the folded-Yukawa single-particle microscopic model. Relative to our FRDM(1992) mass table in {\sc Atomic Data and Nuclear Data Tables} [{\bf 59} 185 (1995)], the results are obtained in the same model, but with considerably improved treatment of deformation and fewer of the approximations that were necessary earlier, due to limitations in computer power. The more accurate execution of the model and the more extensive and more accurate experimental mass data base now available allows us to determine one additional macroscopic-model parameter, the density-symmetry coefficient $L$, which was not varied in the previous calculation, but set to zero. Because we now realize that the FRDM is inaccurate for some highly deformed shapes occurring in fission, because some effects are derived in terms of perturbations around a sphere, we only adjust its macroscopic parameters to ground-state masses. The values of ten constants are determined directly from an optimization to fit ground-state masses of 2149 nuclei ranging from $^{16}$O to $^{265}_{106}$Sg and $^{264}_{108}$Hs. The error of the mass model is 0.5595~MeV. We also provide masses in the FRLDM, which in the more accurate treatments now has an error of 0.6618 MeV. But in contrast to the FRDM, it is suitable for studies of fission and has been extensively so applied elsewhere, with FRLDM(2002) constants. The FRLDM(2012) fits 31 fission barrier heights from $^{70}$Se to $^{252}$Cf with a root-mean-square deviation of 1.052 MeV.
Predictive power for superheavy nuclear mass and possible stability beyond the neutron drip line in deformed relativistic Hartree-Bogoliubov theory in continuum
在超重区$102 \le Z \le 120$中考察了形变相对论Hartree-Bogoliubov连续介质理论(DRHBc)对核质量的预测能力.与WS 4的$0.515$($1.360$)MeV和FRDM的$0.910$($2.831$)MeV相比,预测10(56)个测量(测量和经验)质量的准确度为$0.635$($0.642$)MeV。DRHBc理论同时考虑了形变效应、配对关联和连续效应,探讨了双中子滴线以外的多中子发射的可能稳定性。预测在$_{106}$ Sg、$_{108}$ Hs、$_{110}$ Ds和$_{112}$ Cn同位素链中,超过两中子滴线的两中子和多中子发射的核稳定,形成邻近核大陆的稳定半岛。这种稳定性主要是由于变形,显着影响费米面周围的壳结构。配对关联和连续介质以自洽的方式影响稳定半岛。
Symmetry Energy from Two-Nucleon Separation Energies of Pb and Ca Isotopes
Soongsil University(崇实大学);Hanyang University(汉阳大学);RIKEN, Nishina Center for Accelerator-Based Science(理化学研究所仁科加速器科学中心);University of Aizu(会津大学);Università degli Studi(米兰大学);INFN sezione di Milano(意大利国家核物理研究所米兰分部)
Deformation effect on nuclear density profile and radius enhancement in light- and medium-mass neutron-rich nuclei
核半径的质量数依赖性与核物质性质密切相关。众所周知,大多数原子核都表现出一定的形变。通过对富中子Ne、Mg、Si、S、Ar、Ti、Cr和Fe同位素的系统研究,讨论了核形变对核密度分布的影响,阐明了核半径的增强机制。Skyrme-Hartree-Fock计算在三维笛卡尔网格中进行,以非经验的方式描述核变形。与球形极限的计算结果进行了比较,探讨了核形变对核密度分布的影响。我们发现核变形和内部核密度之间的相关性。核半径的演变似乎遵循最近在球形核中提出的核膨胀机制[Phys. Rev. C 101,061301(R)(2020)],并且核变形进一步增强了半径。该研究需要进一步的理论和实验研究的内部密度。
The Nuclear Level Density and the Determination of Thermonuclear Rates for Astrophysics
在核天体物理研究中,对远离稳定核的截面的预测是一个非常重要的问题。在最近的计算中,核能级密度-作为统计模型(Hauser-Feshbach)的一个重要组成部分-显示出最大的不确定性。我们提出了一个全球参数化的核能级密度的基础上的后移费米气体形式主义。使用一个依赖于能量的能级密度参数$a$和来自Möller等人最近的FRDM质量公式的微观修正导致在质量范围$20\le A \le 245$内的中子分离能处的能级密度的高度改进的拟合。使用适当的微观修正质量公式的重要性进行了强调。所得的能级描述非常适合于天体物理学应用。能级密度还可以提供仅对高密度的激发态正确的统计模型的适用性的线索。利用上述描述,人们可以得出一个"地图",为稳定和不稳定的核与中性和带电粒子的反应模型的适用性。