Low-lying level structure of the neutron-rich nucleus 109Nb: A possible oblate-shape isomer

H. Watanabe; T. Sumikama; S. Nishimura; K. Yoshinaga; Z. Li; Y. Miyashita; K. Yamaguchi; H. Baba; J. S. Berryman; N. Blasi; A. Bracco; F. Camera; J. Chiba; P. Doornenbal; Shintaro Go; T. Hashimoto; S. Hayakawa; C. Hinke; E. Ideguchi; T. Isobe; Y. Ito; D. G. Jenkins; Y. Kawada; N. Kobayashi; Y. Kondo; R. Krücken; S. Kubono; G. Lorusso; T. Nakano; M. Kurata-Nishimura; A. Odahara; H. J. Ong; S. Ota; Zs Podolyák; H. Sakurai; H. Scheit; Y. Shi; K. Steiger; D. Steppenbeck; K. Sugimoto; K. Tajiri; S. Takano; A. Takashima; T. Teranishi; Y. Wakabayashi; P. M. Walker; O. Wieland; F. R. Xu; H. Yamaguchi

doi:10.1016/j.physletb.2010.12.028

Low-lying level structure of the neutron-rich nucleus ¹⁰⁹Nb: A possible oblate-shape isomer

H. Watanabe, T. Sumikama, S. Nishimura, K. Yoshinaga, Z. Li, Y. Miyashita, K. Yamaguchi, H. Baba, J. S. Berryman, N. Blasi, A. Bracco, F. Camera, J. Chiba, P. Doornenbal, Shintaro Go, T. Hashimoto, S. Hayakawa, C. Hinke, E. Ideguchi, T. IsobeY. Ito, D. G. Jenkins, Y. Kawada, N. Kobayashi, Y. Kondo, R. Krücken, S. Kubono, G. Lorusso, T. Nakano, M. Kurata-Nishimura, A. Odahara, H. J. Ong, S. Ota, Zs Podolyák, H. Sakurai, H. Scheit, Y. Shi, K. Steiger, D. Steppenbeck, K. Sugimoto, K. Tajiri, S. Takano, A. Takashima, T. Teranishi, Y. Wakabayashi, P. M. Walker, O. Wieland, F. R. Xu, H. Yamaguchi

Experimental Particle Physics

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Abstract

The neutron-rich nuclei ¹⁰⁹Nb and ¹⁰⁹Zr have been populated using in-flight fission of a ²³⁸U beam at 345 MeV/nucleon at the RIBF facility. A T1/2=150(30) ns isomer at 313 keV has been identified in ¹⁰⁹Nb for the first time. The low-lying levels in ¹⁰⁹Nb have been also populated following the β-decay of ¹⁰⁹Zr. Based on the difference in feeding pattern between the isomeric and β decays, the decay scheme from the isomeric state in ¹⁰⁹Nb was established. The observed hindrances of the electromagnetic transitions deexciting the isomeric state are discussed in terms of possible shape coexistence. Potential energy surface calculations for single-proton configurations predict the presence of low-lying oblate-deformed states in ¹⁰⁹Nb.

Original language	English
Pages (from-to)	186-190
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	696
Issue number	3
DOIs	https://doi.org/10.1016/j.physletb.2010.12.028
Publication status	Published - Jan 31 2011

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/j.physletb.2010.12.028

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Watanabe, H., Sumikama, T., Nishimura, S., Yoshinaga, K., Li, Z., Miyashita, Y., Yamaguchi, K., Baba, H., Berryman, J. S., Blasi, N., Bracco, A., Camera, F., Chiba, J., Doornenbal, P., Go, S., Hashimoto, T., Hayakawa, S., Hinke, C., Ideguchi, E., ... Yamaguchi, H. (2011). Low-lying level structure of the neutron-rich nucleus ¹⁰⁹Nb: A possible oblate-shape isomer. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 696(3), 186-190. https://doi.org/10.1016/j.physletb.2010.12.028

Watanabe, H, Sumikama, T, Nishimura, S, Yoshinaga, K, Li, Z, Miyashita, Y, Yamaguchi, K, Baba, H, Berryman, JS, Blasi, N, Bracco, A, Camera, F, Chiba, J, Doornenbal, P, Go, S, Hashimoto, T, Hayakawa, S, Hinke, C, Ideguchi, E, Isobe, T, Ito, Y, Jenkins, DG, Kawada, Y, Kobayashi, N, Kondo, Y, Krücken, R, Kubono, S, Lorusso, G, Nakano, T, Kurata-Nishimura, M, Odahara, A, Ong, HJ, Ota, S, Podolyák, Z, Sakurai, H, Scheit, H, Shi, Y, Steiger, K, Steppenbeck, D, Sugimoto, K, Tajiri, K, Takano, S, Takashima, A, Teranishi, T, Wakabayashi, Y, Walker, PM, Wieland, O, Xu, FR & Yamaguchi, H 2011, 'Low-lying level structure of the neutron-rich nucleus ¹⁰⁹Nb: A possible oblate-shape isomer', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 696, no. 3, pp. 186-190. https://doi.org/10.1016/j.physletb.2010.12.028

@article{78ccad540547410592f673cbd667cc24,

title = "Low-lying level structure of the neutron-rich nucleus 109Nb: A possible oblate-shape isomer",

abstract = "The neutron-rich nuclei 109Nb and 109Zr have been populated using in-flight fission of a 238U beam at 345 MeV/nucleon at the RIBF facility. A T1/2=150(30) ns isomer at 313 keV has been identified in 109Nb for the first time. The low-lying levels in 109Nb have been also populated following the β-decay of 109Zr. Based on the difference in feeding pattern between the isomeric and β decays, the decay scheme from the isomeric state in 109Nb was established. The observed hindrances of the electromagnetic transitions deexciting the isomeric state are discussed in terms of possible shape coexistence. Potential energy surface calculations for single-proton configurations predict the presence of low-lying oblate-deformed states in 109Nb.",

author = "H. Watanabe and T. Sumikama and S. Nishimura and K. Yoshinaga and Z. Li and Y. Miyashita and K. Yamaguchi and H. Baba and Berryman, {J. S.} and N. Blasi and A. Bracco and F. Camera and J. Chiba and P. Doornenbal and Shintaro Go and T. Hashimoto and S. Hayakawa and C. Hinke and E. Ideguchi and T. Isobe and Y. Ito and Jenkins, {D. G.} and Y. Kawada and N. Kobayashi and Y. Kondo and R. Kr{\"u}cken and S. Kubono and G. Lorusso and T. Nakano and M. Kurata-Nishimura and A. Odahara and Ong, {H. J.} and S. Ota and Zs Podoly{\'a}k and H. Sakurai and H. Scheit and Y. Shi and K. Steiger and D. Steppenbeck and K. Sugimoto and K. Tajiri and S. Takano and A. Takashima and T. Teranishi and Y. Wakabayashi and Walker, {P. M.} and O. Wieland and Xu, {F. R.} and H. Yamaguchi",

note = "Funding Information: We are indebted to the staff members of RIKEN Nishina Center for providing the uranium beams and to the BigRIPS team for tuning the secondary beams. H.W. thanks Professor I. Hamamoto for valuable discussions. This work was supported by the KAKENHI (Grant Nos. 19340074 and 50126124 ), the RIKEN President's Fund (2005), UK STFC and AWE plc. , the DFG Cluster of Excellence Origin and Structure of the Universe and under DFG grant KR 2326/2 .",

year = "2011",

month = jan,

day = "31",

doi = "10.1016/j.physletb.2010.12.028",

language = "English",

volume = "696",

pages = "186--190",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "3",

}

TY - JOUR

T1 - Low-lying level structure of the neutron-rich nucleus 109Nb

T2 - A possible oblate-shape isomer

AU - Watanabe, H.

AU - Sumikama, T.

AU - Nishimura, S.

AU - Yoshinaga, K.

AU - Li, Z.

AU - Miyashita, Y.

AU - Yamaguchi, K.

AU - Baba, H.

AU - Berryman, J. S.

AU - Blasi, N.

AU - Bracco, A.

AU - Camera, F.

AU - Chiba, J.

AU - Doornenbal, P.

AU - Go, Shintaro

AU - Hashimoto, T.

AU - Hayakawa, S.

AU - Hinke, C.

AU - Ideguchi, E.

AU - Isobe, T.

AU - Ito, Y.

AU - Jenkins, D. G.

AU - Kawada, Y.

AU - Kobayashi, N.

AU - Kondo, Y.

AU - Krücken, R.

AU - Kubono, S.

AU - Lorusso, G.

AU - Nakano, T.

AU - Kurata-Nishimura, M.

AU - Odahara, A.

AU - Ong, H. J.

AU - Ota, S.

AU - Podolyák, Zs

AU - Sakurai, H.

AU - Scheit, H.

AU - Shi, Y.

AU - Steiger, K.

AU - Steppenbeck, D.

AU - Sugimoto, K.

AU - Tajiri, K.

AU - Takano, S.

AU - Takashima, A.

AU - Teranishi, T.

AU - Wakabayashi, Y.

AU - Walker, P. M.

AU - Wieland, O.

AU - Xu, F. R.

AU - Yamaguchi, H.

N1 - Funding Information: We are indebted to the staff members of RIKEN Nishina Center for providing the uranium beams and to the BigRIPS team for tuning the secondary beams. H.W. thanks Professor I. Hamamoto for valuable discussions. This work was supported by the KAKENHI (Grant Nos. 19340074 and 50126124 ), the RIKEN President's Fund (2005), UK STFC and AWE plc. , the DFG Cluster of Excellence Origin and Structure of the Universe and under DFG grant KR 2326/2 .

PY - 2011/1/31

Y1 - 2011/1/31

N2 - The neutron-rich nuclei 109Nb and 109Zr have been populated using in-flight fission of a 238U beam at 345 MeV/nucleon at the RIBF facility. A T1/2=150(30) ns isomer at 313 keV has been identified in 109Nb for the first time. The low-lying levels in 109Nb have been also populated following the β-decay of 109Zr. Based on the difference in feeding pattern between the isomeric and β decays, the decay scheme from the isomeric state in 109Nb was established. The observed hindrances of the electromagnetic transitions deexciting the isomeric state are discussed in terms of possible shape coexistence. Potential energy surface calculations for single-proton configurations predict the presence of low-lying oblate-deformed states in 109Nb.

AB - The neutron-rich nuclei 109Nb and 109Zr have been populated using in-flight fission of a 238U beam at 345 MeV/nucleon at the RIBF facility. A T1/2=150(30) ns isomer at 313 keV has been identified in 109Nb for the first time. The low-lying levels in 109Nb have been also populated following the β-decay of 109Zr. Based on the difference in feeding pattern between the isomeric and β decays, the decay scheme from the isomeric state in 109Nb was established. The observed hindrances of the electromagnetic transitions deexciting the isomeric state are discussed in terms of possible shape coexistence. Potential energy surface calculations for single-proton configurations predict the presence of low-lying oblate-deformed states in 109Nb.

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U2 - 10.1016/j.physletb.2010.12.028

DO - 10.1016/j.physletb.2010.12.028

M3 - Article

AN - SCOPUS:78651078111

SN - 0370-2693

VL - 696

SP - 186

EP - 190

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 3

ER -

Low-lying level structure of the neutron-rich nucleus ¹⁰⁹Nb: A possible oblate-shape isomer

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