Atomic parameters for the $2p^{5}3p{}^2{\left[3/2\right]}_2-2p^{5}3s{}^2{\left[3/2\right]}_2^o$ transition of Ne I relevant in nuclear physics

We calculated the magnetic dipole hyperfine interaction constants and the electric field gradients of $2p^{5}3p{}^2{\left[3/2\right]}_2$ and $2p^{5}3s{}^2[3/2{]}_2^o$ levels of Ne I by using the multiconfiguration Dirac–Hartree–Fock method. The electronic factors contributing to the isotope shifts were also estimated for the $\lambda =614.5nm$ transition connecting these two states. Electron correlation and relativistic effects including the Breit interaction were investigated in detail. Combining with recent measurements, we extracted the nuclear quadrupole moment values for ²⁰Ne and ²³Ne with a smaller uncertainty than the current available data. Isotope shifts in the $2p^{5}3p{}^2{\left[3/2\right]}_2-2p^{5}3s{}^2[3/2{]}_2^o$ transition based on the present calculated field- and mass-shift parameters are in good agreement with the experimental values. However, the field shifts in this transition are two or three orders of magnitude smaller than the mass shifts, making rather difficult to deduce changes in nuclear-charge mean-square radii. According to our theoretical predictions, we suggest using instead transitions connecting levels arising from the 2p⁵3s configuration to the ground state, for which the normal mass shift and specific mass shift contributions counteract each other, producing relatively small mass shifts that are only one order of magnitude larger than relatively large field shifts, especially for the $2p^{5}3s{}^2[1/2{]}_1^o-2p^6{}^1{S}_0$ transition. (paper)