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This work reports new calculations of radiative parameters for spectral lines of cosmochronological interest in singly ionized uranium. More precisely, a pseudo-relativistic HartreeFock model including core-polarization effects has been employed to compute the oscillator strengths corresponding to the strongest U II transitions in the visible wavelength range. The results obtained in the present investigation appear to be in reasonable agreement with the most accurate experimental data, reducing in that way the large scattering observed between the formerly published gf values. This allowed us to provide a list of 38 lines that could be used by astrophysicists as cosmochronometers in future studies to determine stellar ages from uranium radioactive decay.

Calculated oscillator strengths for the strongest lines of cosmochronological interest in the visible spectrum of singly ionized uranium (U II)