Beta-gamma spectroscopy of the neutron-rich 150Ba

R. Yokoyama, E. Ideguchi, G. S. Simpson, Mn Tanaka, S. Nishimura, P. Doornenbal, G. Lorusso, P. A. Söderström, T. Sumikama, J. Wu, Z. Y. Xu, N. Aoi, H. Baba, F. L. Bello Garrote, G. Benzoni, F. Browne, R. Daido, Y. Fang, N. Fukuda, A. GottardoG. Gey, S. Go, N. Inabe, T. Isobe, D. Kameda, K. Kobayashi, M. Kobayashi, I. Kojouharov, T. Komatsubara, T. Kubo, N. Kurz, I. Kuti, Z. Li, M. Matsushita, S. Michimasa, C. B. Moon, H. Nishibata, I. Nishizuka, A. Odahara, Z. Patel, S. Rice, E. Sahin, H. Sakurai, H. Schaffner, L. Sinclair, H. Suzuki, H. Takeda, J. Taprogge, Zs Vajta, H. Watanabe, A. Yagi, T. Inakura

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Abstract

Excited states in the neutron-rich nucleus 150Ba have been observed via β–γ spectroscopy at the Radioactive Isotope Beam Factory, RIKEN Nishina Center. The 150Ba ions were produced by the in-flight fission of a 238U beam with an energy of 345 MeV/nucleon. The E(2+) energy of 150Ba was identified at 100 keV, which is the lowest known in the neutron-rich Ba isotopes. A γ-ray peak was also observed at 597 keV. A mean-field calculation with a fully 3D real space was performed and a static octupole deformation was obtained for the Ba isotopes. Kπ = 0− and 1− excited states with significant octupole collectivity were newly predicted at around or lower than 1 MeV on the ground state of 150Ba by a random-phase approximation calculation. The 597 keV γ ray can be interpreted as a negative-parity state, showing that 150Ba may possess octupole collectivity.

Original languageEnglish
Article numberpty037
JournalProgress of Theoretical and Experimental Physics
Volume2018
Issue number4
DOIs
Publication statusPublished - Apr 1 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Yokoyama, R., Ideguchi, E., Simpson, G. S., Tanaka, M., Nishimura, S., Doornenbal, P., Lorusso, G., Söderström, P. A., Sumikama, T., Wu, J., Xu, Z. Y., Aoi, N., Baba, H., Bello Garrote, F. L., Benzoni, G., Browne, F., Daido, R., Fang, Y., Fukuda, N., ... Inakura, T. (2018). Beta-gamma spectroscopy of the neutron-rich 150Ba. Progress of Theoretical and Experimental Physics, 2018(4), [pty037]. https://doi.org/10.1093/ptep/pty037