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

F. Boulay; G. S. Simpson; Y. Ichikawa; S. Kisyov; D. Bucurescu; A. Takamine; D. S. Ahn; K. Asahi; H. Baba; D. L. Balabanski; T. Egami; T. Fujita; N. Fukuda; C. Funayama; T. Furukawa; G. Georgiev; A. Gladkov; M. Hass; K. Imamura; N. Inabe; Y. Ishibashi; T. Kawaguchi; T. Kawamura; W. Kim; Y. Kobayashi; S. Kojima; A. Kusoglu; R. Lozeva; S. Momiyama; I. Mukul; M. Niikura; H. Nishibata; T. Nishizaka; A. Odahara; Y. Ohtomo; D. Ralet; T. Sato; Y. Shimizu; T. Sumikama; H. Suzuki; H. Takeda; L. C. Tao; Y. Togano; D. Tominaga; H. Ueno; H. Yamazaki; X. F. Yang; J. M. Daugas

doi:10.1103/PhysRevLett.124.112501

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

F. Boulay, G. S. Simpson, Y. Ichikawa, S. Kisyov, D. Bucurescu, A. Takamine, D. S. Ahn, K. Asahi, H. Baba, D. L. Balabanski, T. Egami, T. Fujita, N. Fukuda, C. Funayama, T. Furukawa, G. Georgiev, A. Gladkov, M. Hass, K. Imamura, N. InabeY. Ishibashi, T. Kawaguchi, T. Kawamura, W. Kim, Y. Kobayashi, S. Kojima, A. Kusoglu, R. Lozeva, S. Momiyama, I. Mukul, M. Niikura, H. Nishibata, T. Nishizaka, A. Odahara, Y. Ohtomo, D. Ralet, T. Sato, Y. Shimizu, T. Sumikama, H. Suzuki, H. Takeda, L. C. Tao, Y. Togano, D. Tominaga, H. Ueno, H. Yamazaki, X. F. Yang, J. M. Daugas

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Abstract

The gyromagnetic factor of the low-lying E=251.96(9) keV isomeric state of the nucleus Zr99 was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of Jπ=7/2+, with a half-life of T1/2=336(5) ns. The isomer was produced and spin aligned via the abrasion-fission of a U238 primary beam at RIKEN RIBF. A magnetic moment |μ|=2.31(14)μN 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 νd5/2 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.

Original language	English
Article number	112501
Journal	Physical review letters
Volume	124
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.124.112501
Publication status	Published - Mar 20 2020
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.124.112501

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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., Imamura, K., ... Daugas, J. M. (2020). G Factor of the Zr 99 (7/2+) Isomer: Monopole Evolution in the Shape-Coexisting Region. Physical review letters, 124(11), [112501]. https://doi.org/10.1103/PhysRevLett.124.112501

Boulay, F, Simpson, GS, Ichikawa, Y, Kisyov, S, Bucurescu, D, Takamine, A, Ahn, DS, Asahi, K, Baba, H, Balabanski, DL, Egami, T, Fujita, T, Fukuda, N, Funayama, C, Furukawa, T, Georgiev, G, Gladkov, A, Hass, M, Imamura, K, 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, LC, Togano, Y, Tominaga, D, Ueno, H, Yamazaki, H, Yang, XF & Daugas, JM 2020, 'G Factor of the Zr 99 (7/2+) Isomer: Monopole Evolution in the Shape-Coexisting Region', Physical review letters, vol. 124, no. 11, 112501. https://doi.org/10.1103/PhysRevLett.124.112501

@article{f390305b7e4e4714a4e138d94e5ab505,

title = "G Factor of the Zr 99 (7/2+) Isomer: Monopole Evolution in the Shape-Coexisting Region",

abstract = "The gyromagnetic factor of the low-lying E=251.96(9) keV isomeric state of the nucleus Zr99 was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of Jπ=7/2+, with a half-life of T1/2=336(5) ns. The isomer was produced and spin aligned via the abrasion-fission of a U238 primary beam at RIKEN RIBF. A magnetic moment |μ|=2.31(14)μN 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 νd5/2 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.",

author = "F. Boulay and Simpson, {G. S.} and Y. Ichikawa and S. Kisyov and D. Bucurescu and A. Takamine and Ahn, {D. S.} and K. Asahi and H. Baba and Balabanski, {D. L.} and T. Egami and T. Fujita and N. Fukuda and C. Funayama and T. Furukawa and G. Georgiev and A. Gladkov and M. Hass and K. Imamura and N. Inabe and Y. Ishibashi and T. Kawaguchi and T. Kawamura and W. Kim and Y. Kobayashi and S. Kojima and A. Kusoglu and R. Lozeva and S. Momiyama and I. Mukul and M. Niikura and H. Nishibata and T. Nishizaka and A. Odahara and Y. Ohtomo and D. Ralet and T. Sato and Y. Shimizu and T. Sumikama and H. Suzuki and H. Takeda and Tao, {L. C.} and Y. Togano and D. Tominaga and H. Ueno and H. Yamazaki and Yang, {X. F.} and Daugas, {J. M.}",

note = "Funding Information: We would like to thank P. Van Isacker for fruitfull discussions. We are grateful for the technical support received from the accelerator staff of RIBF. This experiment was performed under Program No. NP1306-RIBF99 at RIBF, operated by RIKEN Nishina Center and Center for Nuclear Study, The University of Tokyo. This work was partially supported by the MEXT/JSPS KAKENHI (16K05390, 18H03692, 18H05462), and also in part by JSPS and CNRS under the Japan-France Research Cooperative Program. Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

year = "2020",

month = mar,

day = "20",

doi = "10.1103/PhysRevLett.124.112501",

language = "English",

volume = "124",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "11",

}

TY - JOUR

T1 - G Factor of the Zr 99 (7/2+) Isomer

T2 - Monopole Evolution in the Shape-Coexisting Region

AU - Boulay, F.

AU - Simpson, G. S.

AU - Ichikawa, Y.

AU - Kisyov, S.

AU - Bucurescu, D.

AU - Takamine, A.

AU - Ahn, D. S.

AU - Asahi, K.

AU - Baba, H.

AU - Balabanski, D. L.

AU - Egami, T.

AU - Fujita, T.

AU - Fukuda, N.

AU - Funayama, C.

AU - Furukawa, T.

AU - Georgiev, G.

AU - Gladkov, A.

AU - Hass, M.

AU - Imamura, K.

AU - Inabe, N.

AU - Ishibashi, Y.

AU - Kawaguchi, T.

AU - Kawamura, T.

AU - Kim, W.

AU - Kobayashi, Y.

AU - Kojima, S.

AU - Kusoglu, A.

AU - Lozeva, R.

AU - Momiyama, S.

AU - Mukul, I.

AU - Niikura, M.

AU - Nishibata, H.

AU - Nishizaka, T.

AU - Odahara, A.

AU - Ohtomo, Y.

AU - Ralet, D.

AU - Sato, T.

AU - Shimizu, Y.

AU - Sumikama, T.

AU - Suzuki, H.

AU - Takeda, H.

AU - Tao, L. C.

AU - Togano, Y.

AU - Tominaga, D.

AU - Ueno, H.

AU - Yamazaki, H.

AU - Yang, X. F.

AU - Daugas, J. M.

N1 - Funding Information: We would like to thank P. Van Isacker for fruitfull discussions. We are grateful for the technical support received from the accelerator staff of RIBF. This experiment was performed under Program No. NP1306-RIBF99 at RIBF, operated by RIKEN Nishina Center and Center for Nuclear Study, The University of Tokyo. This work was partially supported by the MEXT/JSPS KAKENHI (16K05390, 18H03692, 18H05462), and also in part by JSPS and CNRS under the Japan-France Research Cooperative Program. Publisher Copyright: © 2020 American Physical Society.

PY - 2020/3/20

Y1 - 2020/3/20

N2 - The gyromagnetic factor of the low-lying E=251.96(9) keV isomeric state of the nucleus Zr99 was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of Jπ=7/2+, with a half-life of T1/2=336(5) ns. The isomer was produced and spin aligned via the abrasion-fission of a U238 primary beam at RIKEN RIBF. A magnetic moment |μ|=2.31(14)μN 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 νd5/2 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.

AB - The gyromagnetic factor of the low-lying E=251.96(9) keV isomeric state of the nucleus Zr99 was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of Jπ=7/2+, with a half-life of T1/2=336(5) ns. The isomer was produced and spin aligned via the abrasion-fission of a U238 primary beam at RIKEN RIBF. A magnetic moment |μ|=2.31(14)μN 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 νd5/2 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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U2 - 10.1103/PhysRevLett.124.112501

DO - 10.1103/PhysRevLett.124.112501

M3 - Article

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AN - SCOPUS:85083042206

SN - 0031-9007

VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

IS - 11

M1 - 112501

ER -

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

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