AI Article Synopsis
- The gyromagnetic factor of an isomeric state in the nucleus ^{99}Zr was measured, showing it has a spin-parity of J^{π}=7/2^{+} and a half-life of 336 ns.
- The isomer was created through the abrasion-fission of a uranium beam at RIKEN RIBF, revealing that its magnetic moment suggests it is not a simple single-particle state.
- Comparisons with theoretical models indicate that this state has strong mixing characteristics and shows significant changes in single-particle evolution when collective modes are present.
Article Abstract
The gyromagnetic factor of the low-lying E=251.96(9) keV isomeric state of the nucleus ^{99}Zr was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of J^{π}=7/2^{+}, with a half-life of T_{1/2}=336(5) ns. The isomer was produced and spin aligned via the abrasion-fission of a ^{238}U primary beam at RIKEN RIBF. A magnetic moment |μ|=2.31(14)μ_{N} was deduced showing that this isomer is not single particle in nature. A comparison of the experimental values with interacting boson-fermion model IBFM-1 results shows that this state is strongly mixed with a main νd_{5/2} composition. Furthermore, it was found that monopole single-particle evolution changes significantly with the appearance of collective modes, likely due to type-II shell evolution.
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| http://dx.doi.org/10.1103/PhysRevLett.124.112501 | DOI Listing |
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