Speaker
Description
The root mean square charge radius is one of the most interesting characteristics of the atomic nucleus. By studying changes in this parameter in a chain of isotopes of one element, one can make conclusions about how the structure of the nucleus changes when the number of neutrons changes, as well as how accurate nuclear theory describes the dependencies obtained in the experiment. In the case of short-lived isotopes, the main experimental method for determining the charge radius is the measurement of isotope shifts of transition energies in atoms.
To interpret such experiments, it turns out that it is necessary to carry out calculations of the electronic structure with the calculation of field and mass shift constants. The field shift constant is related to the different charge distribution over the nucleus for the isotopes under consideration, and the mass shift constant is related to the nuclear recoil effect. We have developed a method for carrying out theoretical calculations of these constants with a detailed analysis of the resulting uncertainties. It was shown that the technique used makes it possible to obtain a significantly higher accuracy of isotope shift factors [1-3]. The results obtained were used in the interpretation of the experiment for a number of neutron-deficient isotopes of thallium [4]. In addition, to interpret future experiments, calculations were carried out for gold and aluminum atoms.
The research was supported by the Russian Science Foundation grant 19-72-10019-P.
[1] Filippin, L., Beerwerth, R., Ekman, J., Fritzsche, S., Godefroid, M., Jönsson, P. Phys. Rev. A, 94(6), 062508 (2016).
[2] Heylen, H., et al., High-resolution laser spectroscopy of Al 27–32. Physical Review C, 103(1), 014318 (2021).
[3] Rosen, A., Fricke, B., Torbohm, G. Zeitschrift fur Physik A Atoms and Nuclei, 316(2), 157-16 (1984).
[4] G. O. Penyazkov, S. D. Prosnyak, A. E. Barzakh, L. V. Skripnikov, J. Chem. Phys. 158, 114110 (2023).
