Laser and decay spectroscopy of the short-lived isotope Fr 214 in the vicinity of the N = 126 shell closure

Abstract : Combined decay and laser spectroscopy measurements of the isotope Fr214 are reported, using the collinear resonance ionization spectroscopy (CRIS) technique at the ISOLDE facility at CERN. For the Iπ=(1−) spin assignment, the g-factor value of g(Fr214)=+0.241(16) corresponds to a relatively pure (π1h9/2 ⊗ ν2g9/2) ground-state configuration. An alternative interpretation with g(Fr214)=+0.144(10), for a (2−) spin assignment suggests a greater contribution of configuration mixing with the ν1i11/2 orbital. As the N=126 shell closure is passed, a kink is observed at the δ⟨r2⟩213,214 value, which is analogous to the behavior observed in the neighboring isotopic chains.
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Submitted on : Tuesday, December 6, 2016 - 11:11:44 AM
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G. Farooq-Smith, T. Cocolios, J. Billowes, M. L. Bissell, I. Budinčević, et al.. Laser and decay spectroscopy of the short-lived isotope Fr 214 in the vicinity of the N = 126 shell closure. Physical Review C, American Physical Society, 2016, 94 (5), pp.054305. ⟨10.1103/PhysRevC.94.054305⟩. ⟨in2p3-01409749⟩

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