Physical Review Letters
108 (16), 162501
2012
A1
Abstract
We report on the spectroscopic quadrupole moment measurement of the 7/21- isomeric state in 1643S27 [E*=320.5(5) keV, T1/2=415(3) ns], using the time dependent perturbed angular distribution technique at the RIKEN RIBF facility. Our value, ∣Qs∣=23(3) efm2, is larger than that expected for a single-particle state. Shell model calculations using the modern SDPF-U interaction for this mass region reproduce remarkably well the measured ∣Qs∣, and show that non-negligible correlations drive the isomeric state away from a purely spherical shape.
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