Conversion coefficients for superheavy elements

In this paper we report on internal conversion coefficients for Z = 111 to Z = 126 superheavy elements obtained from relativistic Dirac-Fock (DF) calculations. The effect of the atomic vacancy created during the conversion process has been taken into account using the so called "Frozen Orbital" approximation. The selection of this atomic model is supported by our recent comparison of experimental and theoretical conversion coefficients across a wide range of nuclei. The atomic masses, valence shell electron configurations, and theoretical atomic binding energies required for the calculations were adopted from a critical evaluation of the published data. The new conversion coefficient data tables presented here cover all atomic shells, transition energies from 1 keV up to 6000 keV, and multipole orders of 1 to 5. A similar approach was used in our previous calculations [1] for Z = 5 - 110.Comment: Accepted for publication in Atomic Data and Nuclear Data Table

Resonance behavior of internal conversion coefficients at low γ-ray energy

A resonance-like structure of internal conversion coefficients (ICCs) at low γ-ray energy (≲ 100 keV) is studied. Our calculations revealed new, previously unknown resonance minima in the energy dependence of ICCs for the ns shells at E2-E5 transition

THE CALCULATIONS FOR DETERMINATION OF THE AGE OF SUPERNOVA REMNANTS AND GALAXY CLUSTERS BY MEASUREMENTS OF HYPERFINE SPLITTING IN HIGHLY IONIZED ATOMS WITH UNSTABLE NUCLEI

The possibility of using the transitions between HFS components of atoms with nonstable nuclei in the spectra of hot gas in the supernova remnants and galaxy clusters for obtaining the information on the age of the objects was mentioned in / 1/ without calculations. Here we present the numerical results for some ionized atoms obtained by relastivistic Hartree-Fock-Dirac method. Fermi distribution of nuclear charge density, vacuum polarisation, electron anomalous magnetic moment and reduced mass were taken into account. The HFS energy levels can be written as ε = ( 1 /2)A(F(F+ 1)-J(J+ 1)-1(1+ 1)), where A=A'(µ/J). HFS constants A' in millielectronvolts for H- Li- and Na-like ions of unstable isotops with well known magnetic moments with Z < 53 are given in the table (abundance rapidly decreases with increasing of Z). For the s-electrons , wavelength λ = (hcJ)/(A'µ(J+( 1 /2))) ; J is the nuclear spin, hc = 1,23985.10-4eV.cmT1/2 is the halflife. Standard deviation is given in parentheses The influence of choice of parameters of nuclear charge and magnetisation distribution over the nuclear volume was also investigated

Evaluation of theoretical conversion coefficients using BrIcc

A new internal conversion coefficient database, BrIcc has been developed which integrates a number of tabulations on internal conversion electron (ICC) and electron-positron pair conversion coefficients (IPC), as well as Ω (E 0) electronic factors. A cr