Abstract
gamma rays following the EC/beta(+) and alpha decay of the N = 126, Fr-213 nucleus have been observed at the CERN isotope separator on-line (ISOLDE) facility with the help of gamma-ray and conversion-electron spectroscopy. These gamma rays establish several hitherto unknown excited states in Rn-213. Also, five new a-decay branches from the Fr-213 ground state have been discovered. Shell model calculations have been performed to understand the newly observed states in Rn-213.
Highlights
The structure of nuclei in the proximity of shell closures is a topic of great interest because it gives direct information on the underlying shell-model orbitals
Γ rays following the EC/β+ and α decay of the N = 126, 213Fr nucleus have been observed at the CERN isotope separator on-line (ISOLDE) facility with the help of γ -ray and conversion-electron spectroscopy
The experiment was performed at the CERN isotope separator on-line (ISOLDE) facility, where a 1.4-GeV proton beam from the CERN PS-Booster impinged on a 46 g/cm2 UCx target
Summary
The structure of nuclei in the proximity of shell closures is a topic of great interest because it gives direct information on the underlying shell-model orbitals. This information is of particular importance to test the accuracy of shell-model predictions and for further improvements to the model, if required. The states with dominant single-particle configurations, especially those with low-j, are often established by observing γ rays following the decay of the parent nucleus. No such γ rays were known in 213Rn prior to our study.
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