Energy systematics of low-lying [Formula Presented] states in neutron-deficient Ba nuclei

M. Asai, T. Sekine, A. Osa, M. Koizumi, Y. Kojima, M. Shibata, H. Yamamoto, K. Kawade

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Low-spin states in [Formula Presented] fed by the [Formula Presented] decay of their La parents have been investigated by means of the γ-γ angular correlation measurement coupled with an isotope separator on-line. The spin of the first excited [Formula Presented] states [Formula Presented] were unambiguously established, and higher-excited [Formula Presented] states were newly identified. The energy of the [Formula Presented] state in [Formula Presented] previously assigned was revised upward. Resultingly, the level energy of the [Formula Presented] state in neutron-deficient Ba nuclei takes a minimum at [Formula Presented] and then gradually increases toward neutron midshell [Formula Presented] while the level energy of the [Formula Presented] state rapidly decreases with decreasing neutron number. From an extrapolation of these [Formula Presented] energies, it is highly expected that the energy relation between the [Formula Presented] and [Formula Presented] state would invert at [Formula Presented] or at more deformed Ba nuclei. This energy inversion is interpreted as the evolution of the [Formula Presented] state in γ-soft nuclei toward the two-phonon γ-vibrational [Formula Presented] state in axially-symmetric deformed nuclei, while the [Formula Presented] state toward the β-vibrational [Formula Presented] state.

Original languageEnglish
Pages (from-to)3045-3053
Number of pages9
JournalPhysical Review C - Nuclear Physics
Volume56
Issue number6
DOIs
Publication statusPublished - Jan 1 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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