g Factor of the Zr-99 (7/2(+)) Isomer: Monopole Evolution in the Shape-Coexisting Region

g Factor of the Zr-99 (7/2(+)) Isomer: Monopole Evolution in the Shape-Coexisting Region

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 a...

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Veröffentlicht in:Physical Review Letters 2020-03, Vol.124 (11)
Hauptverfasser: Boulay, F, Simpson, G.S, Ichikawa, Y, Kisyov, S, Bucurescu, D, Takamine, A, Ahn, D.S, Asahi, K, Baba, H, Balabanski, D.L, Egami, T, Fujita, T, Fukuda, N, Funayama, C, Furukawa, T, Georgiev, G, Gladkov, A, Hass, M, K, Imamura, Inabe, N, Ishibashi, Y, Kawaguchi, T, Kawamura, T, Kim, W, Kobayashi, Y, Kojima, S, Kusoglu, A, Lozeva, R, Momiyama, S, Mukul, I, Niikura, M, Nishibata, H, Nishizaka, T, Odahara, A, Ohtomo, Y, Ralet, D, Sato, T, Shimizu, Y, Sumikama, T, Suzuki, H, Takeda, H, Tao, L.C, Togano, Y, Tominaga, D, Ueno, H, Yamazaki, H, Yang, X.F, Daugas, J.M
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Sprache:eng
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Zusammenfassung: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.
ISSN:0031-9007