Observation of a dramatic hindrance of the nuclear decay of isomeric states for fully ionized atoms

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Abstract

The half-lives of isomeric states of fully ionized 144Tb, 149Dy and 151Er have been measured. These nuclides were produced via fragmentation of about 900 MeV/u 209Bi projectiles, separated in flight with the fragment separator (FRS) and stored in the cooler ring (ESR). The decay times of the cooled fragments have been measured with time-resolved Schottky spectrometry. We observed for the first time drastic increases of the half-lives of bare isomers by factors of up to 30 compared to their neutral counterparts. This is due to the exclusion of the strong internal conversion and electron-capture channels in the radioactive decay of these bare nuclei. The experimental results are in good agreement with theoretical calculations. © 2003 Elsevier B.V. All rights reserved.

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Litvinov, Y. A., Attallah, F., Beckert, K., Bosch, F., Boutin, D., Falch, M., … Wollnik, H. (2003). Observation of a dramatic hindrance of the nuclear decay of isomeric states for fully ionized atoms. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 573(1–4), 80–85. https://doi.org/10.1016/j.physletb.2003.08.077

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