Energy systematics of low-lying 0{sup +} states in neutron-deficient Ba nuclei
- Department of Nuclear Engineering, Nagoya University, Nagoya 464-01 (Japan)
- Department of Chemistry and Fuel Research, Japan Atomic Energy Research Institute, 1233 Watanuki-cho, Takasaki, Gunma 370-12 (Japan)
- Department of Energy Engineering and Science, Nagoya University, Nagoya 464-01 (Japan)
Low-spin states in {sup 124,126,128,130}Ba fed by the EC/{beta}{sup +} decay of their La parents have been investigated by means of the {gamma}-{gamma} angular correlation measurement coupled with an isotope separator on-line. The spin of the first excited 0{sup +} states (0{sub 2}{sup +}) were unambiguously established, and higher-excited 0{sup +} states were newly identified. The energy of the 0{sub 2}{sup +} state in {sup 124}Ba previously assigned was revised upward. Resultingly, the level energy of the 0{sub 2}{sup +} state in neutron-deficient Ba nuclei takes a minimum at N=72 and then gradually increases toward neutron midshell (N=66), while the level energy of the 0{sub 3}{sup +} state rapidly decreases with decreasing neutron number. From an extrapolation of these 0{sup +} energies, it is highly expected that the energy relation between the 0{sub 2}{sup +} and 0{sub 3}{sup +} state would invert at {sup 122}Ba or at more deformed Ba nuclei. This energy inversion is interpreted as the evolution of the 0{sub 2}{sup +} state in {gamma}-soft nuclei toward the two-phonon {gamma}-vibrational 0{sup +} state in axially-symmetric deformed nuclei, while the 0{sub 3}{sup +} state toward the {beta}-vibrational 0{sup +} state. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 550601
- Journal Information:
- Physical Review, C, Vol. 56, Issue 6; Other Information: PBD: Dec 1997
- Country of Publication:
- United States
- Language:
- English
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