The neutron-rich nucleus Mo-110 has been investigated by means of gamma-ray spectroscopy following the beta-decay of Nb-110, produced using in-flight fission of a U-238 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-gamma band built on the second 2(+) state at 494 key 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 gamma 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 approximate to 110 nuclei is discussed in comparison with that in the neutron-rich A approximate to 190 region, by introducing the quantity E-S/E(2(1)(+)), E-S = E(2(2)(+)) - E(4(1)(+)), as a global signature of the structural evolution involving axial asymmetry.
Development of axial asymmetry in the neutron-rich nucleus Mo-110 / H. Watanabe, K. Yamaguchi, A. Odahara, T. Sumikama, S. Nishimura, K. Yoshinaga, Z. Li, Y. Miyashita, K. Sato, L. Prochniak, H. Baba, J.S. Berryman, N. Blasi, A. Bracco, F. Camera, J. Chiba, P. Doornenbal, S. 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. Kruecken, S. Kubono, G. Lorusso, T. Nakano, T. Nakatsukasa, M. Kurata Nishimura, H.J. Ong, S. Ota, Z. Podolyak, 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. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 704:4(2011), pp. 270-275. [10.1016/j.physletb.2011.09.050]
Development of axial asymmetry in the neutron-rich nucleus Mo-110
A. Bracco;F. Camera;
2011
Abstract
The neutron-rich nucleus Mo-110 has been investigated by means of gamma-ray spectroscopy following the beta-decay of Nb-110, produced using in-flight fission of a U-238 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-gamma band built on the second 2(+) state at 494 key 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 gamma 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 approximate to 110 nuclei is discussed in comparison with that in the neutron-rich A approximate to 190 region, by introducing the quantity E-S/E(2(1)(+)), E-S = E(2(2)(+)) - E(4(1)(+)), as a global signature of the structural evolution involving axial asymmetry.
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