<Emphasis Type="Italic">K</Emphasis>-shell ionization during the α-decay of superheavy nuclei

The probabilities of K-shell ionization in daughter atoms during the α-decay of extensively studied ₈₄Po isotopes and superheavy ₁₁₇ ²⁹⁴ Ts, ₁₁₃ ²⁸⁶ Nh, ₁₀₉ ²⁷⁸ Mt, ₁₀₅ ²⁷⁰ Db, ₁₀₂ ²⁵³ No, ₁₀₀ ²⁴⁹ Fm, and ₁₁₁ ²⁷² Rg nuclei are calculated. Monopole and dipole terms are considered. More accurate expressions for α-particle tunneling through the atomic Coulomb barrier are derived. The electron wave functions are calculated using the relativistic Dirac–Fock method. The results are essential for processing the spectra analyzed in combined α-, γ-, and conversion-electron spectroscopy.     

Triggering the <Superscript>178<Emphasis Type="Italic">m</Emphasis>2</Superscript>Hf isomer via resonance conversion

Experiments on photoinduced deexcitation of ^178m2Hf are reanalyzed. A mechanismof triggering the 12.7-keV E3 transition, based on resonance conversion, is considered. That rises the efficiency by an order of magnitude. The main obstacle for enhancing the efficiency is a high internal conversion rate. For this reason, isomers with low multipole order (E1, M1) with high enough energy of the triggering transition are more suitable for triggering. Another way is offered by partial ionization of the outer electrons for decreasing the conversion rate. The results are applied to experiments in laser-produced plasma. The text was submitted by the authors in English.     

The final state interaction in the ionization following the internal nuclear conversion

With the final state interaction taken into account the spectrum of the secondary electrons and the integral characteristics of the ionization following the internal nuclear conversion are calculated. The general equations are obtained while the concrete data is presented for the conversion in₆₉Tm¹⁶⁹.     

Angular distribution of photoelectrons with regard to non-dipole effects in photoionization and elastic electron scattering in solids

The angular distribution of photoelectrons from a semi-infinite solid sample is considered with regard to non-dipole transitions in photoionization with polarized and unpolarized radiation and elastic scattering. Non-dipole transitions are taken into account up to the octupole approximation. Calculations were carried out based on transport theory and Monte Carlo methods. Good agreement between two independent approaches is obtained. All angular parameters, necessary to calculate the angular dependence of intensities of photoelectrons for all elements Z < 100 in a wide range of ionizing radiation energies, are calculated in the relativistic approximation.     

Radiative recombination of an electron with multiply charged uranium ions

Optics and Spectroscopy - Precise relativistic calculations of the total and differential cross sections of radiative recombination of an electron with hydrogen-, helium-, and lithium-like uranium...     

Effect of beta-electron capture to a bound state on delayed-neutron emission from fission fragments

The effect of ionization of the atomic electron shell on beta decay is investigated. The change in the beta-decay probability is due primarily to the appearance of the channel involving beta-electron capture to a bound state. It is shown that the effect may be significant at low beta-transition energies. The magnitude of the effect was studied in the case of the emission of one to three delayed neutrons following the beta decay of fission fragments. In the calculations, use was made of the beta-decay strength function with allowance for the population of isobaric resonances in daughter nuclei. The effect proved to be maximal for fragments where the numbers of protons and neutrons approach those in closed shells and subshells, thereby illustrating the role of the shell structure of the nucleus in fission.     

Relative intensities in x-ray photoelectron spectra

An experimental determination of the relative intensities of X-ray photoelectron lines corresponding to the inner levels of elements with Z ? 20, and calculations of the total photo-ionization cross-sections for all shells of these elements with the Hartree—Fock—Slater potential are reported. The experimental and theoretical values agree well for the 1s levels while marked discrepancies are revealed for the 2p levels. The theoretical values of the cross sections for the atomic valence levels are used to calculate the relative intensities of molecular levels in CF₄, BF₄^?, BeF₄^2?, LiF, NO₃^?, CO₃^2?, CO, N₂, CO₂, H₂O and C₄H₅N. The results of the calculations agree satisfactorily with experiment.     

Comparison of Methods for Eliminating the Bohr–Weisskopf Effect in Atomic Spectra of $${}^{{209}}$$ Bi Heavy Ions

Physics of Atomic Nuclei - The methods of the ratio and specific differences of values of hyperfine splitting in different shells for eliminating the Bohr–Weisskopf effect in...     

Reaction (<Emphasis Type="Italic">n, γα</Emphasis>) assisted by internal and resonance conversion

We consider spectra of γ, internal conversion and α transitions in (n, γ) and (n, γα) reactions on ₆₀¹⁴³Nd. Probabilities of mixing of neutron resonances with different spins and parities arising due to internal and resonance conversion are also considered from the point of view of studying the P-violating processes. Arguments are presented in favor of that the α decay of the 55-eV neutron resonance 4⁻ to the ground state, observed earlier, may be due to such interaction.     

Internal Conversion Coefficients for Observed Low-Energy Gamma Transitions

Physics of Atomic Nuclei - The total internal conversion coefficients for experimentally observed low-energy ( $$E_{\gamma}\lesssim 10$$ keV) gamma transitions are calculated. The resulting values...