Development of axial asymmetry in the neutron-rich nucleus 110Mo

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

doi:10.1016/j.physletb.2011.09.050

Development of axial asymmetry in the neutron-rich nucleus ¹¹⁰Mo

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

Experimental Particle Physics

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Abstract

The neutron-rich nucleus ¹¹⁰Mo has been investigated by means of γ-ray spectroscopy following the β-decay of ¹¹⁰Nb, produced using in-flight fission of a ²³⁸U beam at 345 MeV/nucleon at the RIBF facility. In addition to the ground-band members reported previously, spectroscopic information on the low-lying levels of the quasi-γ band built on the second 2⁺ state at 494 keV has been obtained for the first time. The experimental finding of the second 2⁺ state being lower than the yrast 4⁺ level suggests that axially-asymmetric γ softness is substantially enhanced in this nucleus. The experimental results are compared with model calculations based on the general Bohr Hamiltonian method. The systematics of the low-lying levels in even-even A≈110 nuclei is discussed in comparison with that in the neutron-rich A≈190 region, by introducing the quantity E_S/E(2₁⁺), E_S=E(2₂⁺)-E(4₁⁺), as a global signature of the structural evolution involving axial asymmetry.

Original language	English
Pages (from-to)	270-275
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	704
Issue number	4
DOIs	https://doi.org/10.1016/j.physletb.2011.09.050
Publication status	Published - Oct 19 2011

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/j.physletb.2011.09.050

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Watanabe, H., Yamaguchi, K., Odahara, A., Sumikama, T., Nishimura, S., Yoshinaga, K., Li, Z., Miyashita, Y., Sato, K., Próchniak, L., Baba, H., Berryman, J. S., Blasi, N., Bracco, A., Camera, F., Chiba, J., Doornenbal, P., Go, S., Hashimoto, T., ... Yamaguchi, H. (2011). Development of axial asymmetry in the neutron-rich nucleus ¹¹⁰Mo. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 704(4), 270-275. https://doi.org/10.1016/j.physletb.2011.09.050

Watanabe, H, Yamaguchi, K, Odahara, A, Sumikama, T, Nishimura, S, Yoshinaga, K, Li, Z, Miyashita, Y, Sato, K, Próchniak, L, Baba, H, Berryman, JS, Blasi, N, Bracco, A, Camera, F, Chiba, J, Doornenbal, P, Go, S, Hashimoto, T, Hayakawa, S, Hinke, C, Hinohara, N, Ideguchi, E, Isobe, T, Ito, Y, Jenkins, DG, Kawada, Y, Kobayashi, N, Kondo, Y, Krücken, R, Kubono, S, Lorusso, G, Nakano, T, Nakatsukasa, T, Kurata-Nishimura, M, Ong, HJ, Ota, S, Podolyák, ZS, Sakurai, H, Scheit, H, Steiger, K, Steppenbeck, D, Sugimoto, K, Tajiri, K, Takano, S, Takashima, A, Teranishi, T, Wakabayashi, Y, Walker, PM, Wieland, O & Yamaguchi, H 2011, 'Development of axial asymmetry in the neutron-rich nucleus ¹¹⁰Mo', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 704, no. 4, pp. 270-275. https://doi.org/10.1016/j.physletb.2011.09.050

@article{ddd5461e913a45f5be96e45647213452,

title = "Development of axial asymmetry in the neutron-rich nucleus 110Mo",

abstract = "The neutron-rich nucleus 110Mo has been investigated by means of γ-ray spectroscopy following the β-decay of 110Nb, produced using in-flight fission of a 238U beam at 345 MeV/nucleon at the RIBF facility. In addition to the ground-band members reported previously, spectroscopic information on the low-lying levels of the quasi-γ band built on the second 2+ state at 494 keV has been obtained for the first time. The experimental finding of the second 2+ state being lower than the yrast 4+ level suggests that axially-asymmetric γ softness is substantially enhanced in this nucleus. The experimental results are compared with model calculations based on the general Bohr Hamiltonian method. The systematics of the low-lying levels in even-even A≈110 nuclei is discussed in comparison with that in the neutron-rich A≈190 region, by introducing the quantity ES/E(21+), ES=E(22+)-E(41+), as a global signature of the structural evolution involving axial asymmetry.",

author = "H. Watanabe and K. Yamaguchi and A. Odahara and T. Sumikama and S. Nishimura and K. Yoshinaga and Z. Li and Y. Miyashita and K. Sato and L. Pr{\'o}chniak 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 N. Hinohara 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 T. Nakatsukasa and M. Kurata-Nishimura and Ong, {H. J.} and S. Ota and Podoly{\'a}k, {Z. S.} and H. Sakurai and H. Scheit 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 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 Prof. I. Hamamoto, Prof. Y. Sun, and Prof. K. Matsuyanagi for valuable discussions. This work was supported by the KAKENHI (Grant Nos. 19340074 , 50126124 , and 21340073 ), the RIKEN Presidentʼs 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 . The numerical calculation was performed in part on RIKEN Integrated Cluster of Clusters (RICC).",

year = "2011",

month = oct,

day = "19",

doi = "10.1016/j.physletb.2011.09.050",

language = "English",

volume = "704",

pages = "270--275",

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

issn = "0370-2693",

publisher = "Elsevier",

number = "4",

}

TY - JOUR

T1 - Development of axial asymmetry in the neutron-rich nucleus 110Mo

AU - Watanabe, H.

AU - Yamaguchi, K.

AU - Odahara, A.

AU - Sumikama, T.

AU - Nishimura, S.

AU - Yoshinaga, K.

AU - Li, Z.

AU - Miyashita, Y.

AU - Sato, K.

AU - Próchniak, L.

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 - Hinohara, N.

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 - Nakatsukasa, T.

AU - Kurata-Nishimura, M.

AU - Ong, H. J.

AU - Ota, S.

AU - Podolyák, Z. S.

AU - Sakurai, H.

AU - Scheit, H.

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 - 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 Prof. I. Hamamoto, Prof. Y. Sun, and Prof. K. Matsuyanagi for valuable discussions. This work was supported by the KAKENHI (Grant Nos. 19340074 , 50126124 , and 21340073 ), the RIKEN Presidentʼs 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 . The numerical calculation was performed in part on RIKEN Integrated Cluster of Clusters (RICC).

PY - 2011/10/19

Y1 - 2011/10/19

N2 - The neutron-rich nucleus 110Mo has been investigated by means of γ-ray spectroscopy following the β-decay of 110Nb, produced using in-flight fission of a 238U beam at 345 MeV/nucleon at the RIBF facility. In addition to the ground-band members reported previously, spectroscopic information on the low-lying levels of the quasi-γ band built on the second 2+ state at 494 keV has been obtained for the first time. The experimental finding of the second 2+ state being lower than the yrast 4+ level suggests that axially-asymmetric γ softness is substantially enhanced in this nucleus. The experimental results are compared with model calculations based on the general Bohr Hamiltonian method. The systematics of the low-lying levels in even-even A≈110 nuclei is discussed in comparison with that in the neutron-rich A≈190 region, by introducing the quantity ES/E(21+), ES=E(22+)-E(41+), as a global signature of the structural evolution involving axial asymmetry.

AB - The neutron-rich nucleus 110Mo has been investigated by means of γ-ray spectroscopy following the β-decay of 110Nb, produced using in-flight fission of a 238U beam at 345 MeV/nucleon at the RIBF facility. In addition to the ground-band members reported previously, spectroscopic information on the low-lying levels of the quasi-γ band built on the second 2+ state at 494 keV has been obtained for the first time. The experimental finding of the second 2+ state being lower than the yrast 4+ level suggests that axially-asymmetric γ softness is substantially enhanced in this nucleus. The experimental results are compared with model calculations based on the general Bohr Hamiltonian method. The systematics of the low-lying levels in even-even A≈110 nuclei is discussed in comparison with that in the neutron-rich A≈190 region, by introducing the quantity ES/E(21+), ES=E(22+)-E(41+), as a global signature of the structural evolution involving axial asymmetry.

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U2 - 10.1016/j.physletb.2011.09.050

DO - 10.1016/j.physletb.2011.09.050

M3 - Article

AN - SCOPUS:80053385095

SN - 0370-2693

VL - 704

SP - 270

EP - 275

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 - 4

ER -

Development of axial asymmetry in the neutron-rich nucleus ¹¹⁰Mo

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