First-Forbidden Continuum- and Bound-State beta^- -Decay Rates of Bare 205Hg80+ and 207Tl81+ Ions

TL;DR

This paper calculates and compares the continuum- and bound-state beta^- decay rates of bare 205Hg80+ and 207Tl81+ ions, finding good agreement with experimental data for 207Tl81+ but some discrepancy for 205Hg80+.

Contribution

It provides theoretical calculations of decay rate ratios for specific ions and compares them with recent experimental measurements, highlighting areas of agreement and discrepancy.

Findings

Theoretical ratio R_(b/c) for 207Tl81+ matches experimental data within 1%.

Theoretical ratio R_(b/c) for 205Hg80+ is about 20% smaller than experimental data.

Calculated decay rates contribute to understanding beta decay in highly ionized heavy ions.

Abstract

We calculate the decay rates lambda_(beta^-_c) and lambda_(beta^-_b) of the continuum- and bound-state beta^- decays for bare 205Hg80+ and 207Tl81+ ions. For the ratio of the decay rates R_(b/c) = lambda_(beta^-_b)/lambda_(beta^-_c) we obtain the values R_(b/c) = 0.161 and R_(b/c) = 0.190 for bare 205Hg80+ and 207Tl81+ ions, respectively. The theoretical value of the ratio R_(b/c) = 0.190 for the decays of 207Tl81+ agrees within 1% of accuracy with the experimental data R^exp_(b/c) = 0.188(18), obtained at GSI. The theoretical ratio R_(b/c) = 0.161 for 205Hg80+ is about 20% smaller than the experimental value R^exp_(b/c) = 0.20(2), measured recently at GSI.