We present moments and transition probabilities in the neighboring odd-mass nuclei of $^{208}$Pb calculated fully self-consistently from the s.p. properties of $^{208}$Pb with polarization corrections from its excitations, both given from previous Skyrme-Hartree-Fock and RPA calculations. The electric results agree nicely with the data with two very interesting exceptions. In the magnetic case we obtain similar results. We discuss also polarization contributions to the $l$-forbidden $M1$ transitions, which are, however, much too small compared to the data. With a modified external field operator which accounts effectively for mesonic and many-body effects the description of the data can be substantially improved.
This work investigated the first-chance survival probabilities of highly excited compound superheavy nuclei in the prospect of synthesizing new superheavy elements. The main feature of our modelings is the adoption of microscopic temperature dependent fission barriers in calculations of fission rates. A simple derivation is demonstrated to elucidate the connection between Bohr-Wheeler statistical model and imaginary free energy method, obtaining a new formula for fission rates. The best modeling is chosen with respect to reproducing the experimental fission probability of $^{210}$Po. Systemati…
Systematic study of unfavored $\mathcalα$ decay half-lives of closed shell nuclei related to ground and isomeric states
采用双势方法,从母核的原子价(空穴)和同位旋不对称性的角度,研究了与$Z=82$、$N=82$和126壳层封闭周围基态和同分异构态有关的封闭壳层核的不利$\mathcalα$衰变半衰期和$\mathcalα$预形成几率.结果表明,$\mathcalα$预形成几率与$N_p N_n$或$N_p N_n I$成线性关系,与我们以前工作[X.-X.]中的有利$\mathcalα$衰变的情况相同。D. Sun \textit{et al.},Phys. Rev. C 94,024338(2016)]。$N_p$、$N_n$和$I$分别表示母核的价质子(空穴)数、价中子(空穴)数和同位旋。通过对实验数据与计算半衰期之间的差异提取的$\mathrmα$预生成概率数据进行拟合,得到了两个计算$\mathcalα$预生成概率的线性公式及相应的参数值。根据这些公式和相应的参数,我们计算了这些核的$\mathrmα$衰变半衰期。计算结果与实验数据吻合较好。
Electron scattering and the distribution of electric charge and magnetization inside nuclei
Old Dominion University(老道明大学);Jefferson Lab(杰斐逊实验室);Washington University in Saint Louis(圣路易斯华盛顿大学);Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室);McDonnell Center for the Space Sciences at Washington University in St. Louis(华盛顿大学圣路易斯分校麦克唐奈太空科学中心)
This article summarizes recent progress in our understanding of the reaction mechanisms leading to the formation of superheavy nuclei in cold and hot fusion reactions. Calculations are done within the Fusion-by-Diffusion (FBD) model using the new nuclear data tables by Jachimowicz et al. [At. Data Nucl. Data Tables 138, 101393 (2021)]. The synthesis reaction is treated in a standard way as a three-step process (i.e., capture, fusion, and survival). Each reaction step is analyzed separately. Model calculations are compared with selected experimental data on capture, fissionlike and fusion cross…
Pygmy and giant electric dipole responses of medium-heavy nuclei in a self-consistent Random Phase Approximation approach with finite-range interaction
In any finite system, the presence of a non-zero permanent electric dipole moment (EDM) would indicate CP violation beyond the small violation predicted in the Standard Model. Here, we use the ab initio no-core shell model (NCSM) framework to theoretically investigate the magnitude of the nuclear EDM. We calculate EDMs of several light nuclei using chiral two- and three-body interactions and a PT-violating Hamiltonian based on a one-meson-exchange model. We present a benchmark calculation for $^3$He, as well as results for the more complex nuclei $^{6,7}$Li, $^9$Be, $^{10,11}$B, $^{13}$C, $^{1…
Insights into the equation of state of neutron rich matter obtained from the neutron skin thickness of 208Pb are in sharp conflict with earlier measurements of the electric dipole polarizability. We use a set of accurately calibrated energy density functionals to highlight the tension and to articulate how plans for a highly-intense Gamma Factory may alleviate the tension.
Microscopic Calculation of Electric Quadrupole Effective Charges in Exotic Nuclei
University of South China(南华大学);Key Laboratory of Advanced Nuclear Energy Design and Safety, Ministry of Education(教育部先进核能设计与安全重点实验室);Guizhou Minzu University(贵州民族大学);Shanghai Jiao Tong University(上海交通大学);Shanghai Key Laboratory for Particle Physics and Cosmology(上海粒子物理与宇宙学重点实验室);Lanzhou University(兰州大学);Key Laboratory of Special Function Materials and Structure Design(特殊功能材料与结构设计重点实验室)