Low-lying structure and shape evolution in neutron-rich Se isotopes
- Chen, S.
- Doornenbal, P.
- Obertelli, A.
- Rodriguez, T. R.
- Authelet, G.
- Baba, H.
- Calvet, D.
- Chateau, F.
- Corsi, A.
- Delbart, A.
- Gheller, J.M.
- Giganon, A.
- Gillibert, A.
- Lapoux, V.
- Motobayashi, T.
- Niikura, M.
- Paul, N.
- Rousse, J.Y.
- Sakurai, H.
- Santamaria, C.
- Steppenbeck, D.
- Taniuchi, R.
- Uesaka, T.
- Ando, T.
- Arici, T.
- Blazhev, A.
- Browne, F.
- Bruce, A. M.
- Caroll, R.
- Chung, L. X.
- Cortes, M. L.
- Dewald, M.
- Ding, B.
- Flavigny, F.
- Franchoo, S.
- Gorska, M.
- Gottardo, A.
- Jungclaus, A.
- Lee, J.
- Lettmann, M.
- Linh, B. D.
- Liu, J.
- Liu,
DOIAbstract
Neutron-rich Se-88,Se-90,Se-92,Se-94 isotopes were studied via in-beam gamma-ray spectroscopy after nucleon removal reactions at intermediate energies at the Radioactive Isotope Beam Factory. Based on gamma-gamma coincidence analysis, low-lying excitation level schemes are proposed for these nuclei, including the 2(1)(+), 4(1)(+) states and 2(2)(+) states at remarkably low energies. The low-lying 2(2)(+) states, along with other features, indicate triaxiality in these nuclei. The experimental results are in good overall agreement with self-consistent beyond-mean-field calculations based on the Gogny D1S interaction, which suggests both triaxial degree of freedom and shape coexistence playing important roles in the description of intrinsic d...
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