[en] Electron-impact single ionization is investigated for the levels of the ground $3d^5$ and long-lived $3d^{4}4s$ configurations of the Fe³ ion. In addition, the Maxwellian rate coefficients are tabulated in the study. The difference among the cross sections reaches $\sim$11% and $\sim$17% for the levels of the ground and long-lived configurations, respectively. The excitation autoionization (EA) provides the larger variation of the cross sections compared to the direct ionization (DI). It is demonstrated that the EA cross sections for the levels of the ground configuration vary more strongly compared to the values calculated for the excited configuration. On the other hand, the DI cross sections evaluated for the levels of the ground configuration agree within $\sim$4% while the difference of $\sim$9% is obtained for the levels of the long-lived configuration.

[en] Highlights: • ICCs at low $\gamma$-ray energies from 0.1 keV to 1 keV are given for $10\le Z\le 118$. • Calculations were performed by the Dirac–Fock method. • The hole in an atomic shell after conversion was taken into account. • Peculiarities of the low-energy ICCs behavior are considered. • The ICC calculations are in agreement with available experimental data. Presented here are internal conversion coefficients (ICCs) for nuclear transitions of low $\gamma$-ray energies from 0.1 keV to 1 keV in elements with $10\le Z\le 118$. The low-energy nuclear transitions attract significant interest since the novel experimental technique and methods make it possible to study the transitions as well as to discover new low-lying isomers. Our ICC calculations are shown to be in excellent agreement with experimental data for the fairly low-energy nuclear transitions. The calculations are based on the Dirac–Fock method. The vacancy in the atomic shell from which an electron has been emitted is taken into account in the framework of the frozen core approximation. Experimental binding energies are used for elements $Z\le 95$. Theoretical binding energies obtained in a good approximation are used for $Z\ge 96$. Peculiarities of the ICC behavior at low energies are considered. The resonance-like structure of ICC and the drastic decrease in magnitude as the energy increases are demonstrated to be responsible for a pronounced dependence of ICC on theoretical assumptions underlying the calculations. We discuss the influence on the low-energy ICCs of the exact taking account the exchange interaction between electrons, the inclusion of the vacancy after conversion, and a credible choice of the binding energy.

[en] The new Atomki-V2 $\alpha$-nucleus potential is applied to calculate astrophysical reaction rates $N_A〈\sigma v〉$ of intermediate mass and heavy target nuclei from iron ($Z=26$) up to bismuth ($Z=83$). Overall, reaction rates of $\alpha$-induced reactions are provided for 4359 target nuclei, covering as well neutron-deficient as extremely neutron-rich target nuclei from the proton to the neutron dripline. Contrary to previous rate compilations, these new calculations include all relevant exit channels with the dominating ($\alpha$, xn) reactions for neutron-rich target nuclei.

[en] The root-mean-square (rms) charge radii of 236 nuclides measured by laser spectroscopy experiment are compiled, and the uncertainties are calculated. From the rms charge radii of Mg isotope chain, the new magic number $N=14$ can be observed, and the traditional magic number $N=20$ disappears in the K isotope chain. A good linear relationship between the difference of the mirror nuclear charge radii and the isospin asymmetry can be clearly observed with a Pearson’s linear correlation coefficient of 0.96. The accuracies and predictive powers of the WS* and HFB25 models are tested with these new data. The rms deviation with the WS* model is only 0.0176 fm for the 129 new data, which is much better than that of HFB25 model. The influence of deformation effect on nuclear charge radius prediction is studied systematically.

[en] Highlights: • Energies and radiative transition data for the main states of the n$⩽$ 3 configurations in O-like Ions between Ar XI and Cr XVII are provided. • The multiconfiguration Dirac–Hartree–Fock and the relativistic configuration interaction methods are employed. • The most accurate and complete atomic data for O-like Ions between Ar XI and Cr XVII are provided. Using the multiconfiguration Dirac–Hartree–Fock and the relativistic configuration interaction methods, a consistent set of transition energies and radiative transition data for the main states of the $2s^{2}2p^4$, $2s2p^5$, $2p^6$, $2s^{2}2p^{3}3s$, $2s^{2}2p^{3}3p$, $2s^{2}2p^{3}3d$, $2s2p^{4}3s$, $2s2p^{4}3p$, and $2s2p^{4}3d$ configurations in O-like Ions between Ar XI ($Z=18$) and Cr XVII ($Z=24$) is provided. Our data set is compared with the NIST compiled values and previous calculations. The data are accurate enough for identification and deblending of new emission lines from hot astrophysical and laboratory plasmas. The amount of data of high accuracy is significantly increased for the $n=3$ states of several O-like ions, where experimental data are very scarce.

[en] Accurate values of electric dipole (E1) amplitudes along with their uncertainties for a number of transitions among low-lying states of Mg${}^{+}$, Ca${}^{+}$, Sr${}^{+}$, and Ba${}^{+}$ are listed by carrying out calculations using a relativistic all-order many-body method. By combining experimental wavelengths with these amplitudes, we quote transition probabilities, oscillator strengths and lifetimes of many short-lived excited states of the above ions. The uncertainties in these radiative properties are also quoted. We also give electric quadrupole (E2) and magnetic dipole (M1) amplitudes of the metastable states of the Ca${}^{+}$, Sr${}^{+}$, and Ba${}^{+}$ ions by performing similar calculations. Using these calculated E1, E2 and M1 matrix elements, we have estimated the transition probabilities, oscillator strengths and lifetimes of a number of allowed and metastable states. These quantities are further compared with the values available from the other theoretical studies and experimental data in the literature. The present data will be useful for the astrophysical observations, laboratory analysis and simulations of spectral properties in the above considered alkaline-earth metal ions.

[en] Relativistic perturbation theory with model potential of zero approximation is used for calculation of the energy levels 3p⁶3d⁹4$\ell$, 3p⁵3d¹⁰4$\ell$ ($\ell$=1–3) of Ni-like ions with Z=36–56. The known ionization potentials of Ni-like ions used in calculations are corrected here. The dipole and quadrupole electric and magnetic probabilities of radiative transitions to the ground state are presented in graphs. It is shown that in the point of crossing of levels of the same parity and the same J a strong interaction of these levels occurs, which leads to a redistribution of the oscillator strengths of the radiative transitions from these levels. The crossing of energy levels of the opposite parities 3p⁵3d¹⁰4s [J=0], 3p⁵3d¹⁰4p [J=1] in Sn XXIII is shown.

[en] We present a comprehensive set of vibrationally-resolved cross sections for electron-impact electronic excitation of the isotopologues of molecular hydrogen (D₂, T₂, HD, HT, and DT) initially in the ground electronic state. We apply the adiabatic-nuclei molecular convergent close-coupling (MCCC) method to calculate cross sections from threshold to 500 eV for excitation of all bound vibrational levels and dissociative excitation of the $B{}^1{\Sigma }_u^{+}$, $C{}^1{\Pi }_u$, $EF{}^1{\Sigma }_g^{+}$, $B^{\prime }{}^1{\Sigma }_u^{+}$, $GK{}^1{\Sigma }_g^{+}$, $I{}^1{\Pi }_g$, $J{}^1{\Delta }_g$, $D{}^1{\Pi }_u$, $H{}^1{\Sigma }_g^{+}$, $b{}^3{\Sigma }_u^{+}$, $c{}^3{\Pi }_u$, $a{}^3{\Sigma }_g^{+}$, $e{}^3{\Sigma }_u^{+}$, $d{}^3{\Pi }_u$, $h{}^3{\Sigma }_g^{+}$, $g{}^3{\Sigma }_g^{+}$, $i{}^3{\Pi }_g$, and $j{}^3{\Delta }_g$ electronic states from all bound vibrational levels of the ground electronic ($X{}^1{\Sigma }_g^{+}$) state. Including the previously-published MCCC e-H₂ cross sections (Scarlett et al., Atom. Data Nucl. Data Tables 137 (2021) 101361) the data set contains cross sections for over 60,000 electronic and vibrational transitions. The cross sections are presented in graphical form and provided as both numerical values and analytic fit functions in supplementary data files. The data can also be downloaded from the MCCC database at mccc-db.org.

[en] The ab initio quasirelativistic approach developed specifically for the calculation of spectral parameters of highly charged ions was used to derive transition data for the Ru-like tungsten ion W${}^{30+}$. The configuration interaction method was applied to include electron correlation effects. The relativistic effects were taken into account in the Breit–Pauli approximation. The level energies, radiative lifetimes $\tau$, Landé $g$-factors were determined for the ground configuration 4p⁶4d⁸ and two excited configurations 4p⁵4d⁹ and 4p⁶4d⁷4f. The radiative transition wavelengths $\lambda$ and emission transition probabilities $A$ for the electric dipole, electric quadrupole, electric octupole, magnetic dipole, and magnetic quadrupole transitions among the levels of these configurations were generated.

[en] We systematically determine ground-state and saddle-point shapes and masses for 1305 heavy and superheavy nuclei with $Z=98$–126 and $N=134$–$192$, including odd-$A$ and odd–odd systems. From these we derive static fission barrier heights, one- and two-nucleon separation energies, and $Q_{\alpha }$ values for g.s. to g.s. transitions. Our study is performed within the microscopic–macroscopic method with the deformed Woods–Saxon single-particle potential and the Yukawa-plus-exponential macroscopic energy taken as the smooth part. We use parameters of the model that were fitted previously to masses of even–even heavy nuclei. For systems with odd numbers of protons, neutrons, or both, we use a standard BCS method with blocking. Ground-state shapes and energies are found by the minimization over seven axially-symmetric deformations. A search for saddle-points was performed by using the ”imaginary water flow” method in three consecutive stages, using five- (for nonaxial shapes) and seven-dimensional (for reflection-asymmetric shapes) deformation spaces. Calculated ground-state mass excess, nucleon separation- and $Q_{\alpha }$ energies, total, macroscopic (normalized to the macroscopic energy at the spherical shape) and shell corrections energies, and deformations are given for each nucleus in Table 1. Table 2 contains calculated properties of the saddle-point configurations and the fission barrier heights. In Tables 3-7, are given calculated ground-state, inner and outer saddle-point and superdeformed secondary minima characteristics for 75 actinide nuclei, from Ac to Cf, for which experimental estimates of fission barrier heights are known. These results are an additional test of our model.