123 research outputs found
Comment on "Quantitative x-ray photoelectron spectroscopy: Quadrupole effects, shake up, Shirley background, and relative sensitivity factors from a database of true x-ray photoelectron spectra"
This Comment demonstrates that a comparison analysis by Seah and Gilmore
between experimental data on the X-ray photoelectron spectroscopy intensities
and theoretical data by Trzhaskovskaya et al. is misleading due to a number of
serious errors made by Seah and Gilmore (Phys. Rev. B, 73, 174113).Comment: 7 pages, 3 figures, submitted to Phys. Rev.
The off-resonant dielectronic recombination in a collision of an electron with a heavy hydrogen-like ion
The recombination of an electron with an (initially) hydrogen-like ion is
investigated. The effect of the electron-electron interaction is treated
rigorously to the first order in the parameter 1/Z and within the
screening-potential approximation to higher orders in 1/Z, with Z being the
nuclear charge number. The two-electron correction contains the
dielectronic-recombination part, which contributes to the process not only
under the resonance condition for the projectile energy but also in the regions
far from resonances. The mechanism of the off-resonant dielectronic
recombination is studied in detail.Comment: 9 pages, 2 tables, 3 figure
Shake-off in the 164Er neutrinoless double electronic capture and the dark matter puzzle
Traditionally double neutrinoless electronic capture is considered as a
resonance process. We have fulfilled shake-off probability calculations,
leading to ionization of the electron shell, in the case of 164Er. Allowance
for the shake-off removes the requirement of resonance, leading to a radical
increase of the capture rate. In the case of 164Er, the contribution of the new
mechanism increases the capture rate by a factor of 5.6 as compared to the
conventional resonance fluorescence mechanism. It also increases the
probability of electron capture from higher shells, which must be foreseen in
the experimental studies. Moreover, the effect of the shake-off can expand the
list of candidate nuclei for experimental research. The influence of the
shake-off is also expected to manifest itself in the other beta processes which
are used in the studies of the neutrino nature, its mass and role in the dark
matter puzzle.Comment: 16 pages, 6 figures. Delivered as a talk at the 71 International
conference NUCLEUS - 2021. Nuclear physics and elementary particle physics.
Nuclear physics technologies, September 20 - 25, 2021, Saint-Petersburg,
Russi
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
- …