Beta-gamma spectroscopy of the neutron-rich 150Ba. (16th April 2018)

• Record Type: Journal Article
• Authors: Yokoyama, R; Ideguchi, E; Simpson, G S; Tanaka, Mn; 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; Gottardo, A; Gey, G; Go, S; Inabe, N; Isobe, T; Kameda, D; Kobayashi, K; Kobayashi, M; Kojouharov, I; Komatsubara, T; Kubo, T; Kurz, N; Kuti, I; Li, Z; Matsushita, M; Michimasa, S; Moon, C B; Nishibata, H; Nishizuka, I; Odahara, A; Patel, Z; Rice, S; Sahin, E; Sakurai, H; Schaffner, H; Sinclair, L; Suzuki, H; Takeda, H; Taprogge, J; Vajta, Zs; Watanabe, H; Yagi, A; Inakura, T;
• Is Part Of: Progress of theoretical and experimental physics. Volume 2018:Number 4(2018)
• Publication Date: 2018-04-16
• Subjects: D11 -- D12 -- D13 -- D29; Physics -- Periodicals; Mathematical physics -- Periodicals; 530.05
• DOI: 10.1093/ptep/pty037
• Languages: English
• ISSNs: 2050-3911

Abstract

Abstract: Excited states in the neutron-rich nucleus $^{150}$ Ba have been observed via ${\rm \beta}$ –${\rm \gamma}$ spectroscopy at the Radioactive Isotope Beam Factory, RIKEN Nishina Center. The $^{150}$ Ba ions were produced by the in-flight fission of a $^{238}$ U beam with an energy of 345 MeV/nucleon. The $E(2^{+})$ energy of $^{150}$ Ba was identified at 100 keV, which is the lowest known in the neutron-rich Ba isotopes. A ${\rm \gamma}$ -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. $K^{\pi}=0^{-}$ and $1^{-}$ excited states with significant octupole collectivity were newly predicted at around or lower than 1 MeV on the ground state of $^{150}$ Ba by a random-phase approximation calculation. The 597 keV ${\rm \gamma}$ ray can be interpreted as a negative-parity state, showing that $^{150}$ Ba may possess octupole collectivity.