g Factor of the Zr-99 (7/2(+)) Isomer: Monopole Evolution in the Shape-Coexisting Region
Date
2020Author
Funayama, C.
Kim, W.
Kobayashi, Y.
Kojima, S.
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.
Kusoglu, Aslı
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.
Furukawa, T.
Georgiev, G.
Gladkov, A.
Hass, M.
Imamura, K.
Inabe, N.
Ishibashi, Y.
Kawaguchi, T.
Kawamura, T.
Metadata
Show full item recordAbstract
The gyromagnetic factor of the low-lying E = 251.96(9) keV isomeric state of the nucleus Zr-99 was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of J(pi) = 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 U-238 primary beam at RIKEN RIBF. A magnetic moment vertical bar mu vertical bar = 2.31(14)mu(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 nu d(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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