Low-lying structure and shape evolution in neutron-rich Se isotopes

S. Chen 1, 2, * P. Doornenbal 1 A. Obertelli 3, 1 T.R. Rodriguez 4 G. Authelet 3 H. Baba 1 D. Calvet 3 T. Motobayashi 1 F. Château 3 A. Corsi 3 A. Delbart 3 J.-M. Gheller 3 A. Giganon 3 A. Gillibert 3 V. Lapoux 3 J.-Y. Roussé 3 H. Sakurai 1 D. Steppenbeck 1 C. Santamaria 3 Taniuchi R. 1, 5 Uesaka T. 1 A. Gottardo 6 I. Stefan M. Niikura 5 N. Paul 3 Ando T. 1, 5 Arici T. 7 Blazhev. A. 8 Bruce A. M. 9 R. Caroll 10 L.X. Chung 11 M.L. Cortés 12, 7 M. Dewald 8 B. Ding 13 F. Flavigny 6 S. Franchoo 6 M. Górska 7 A. Jungclaus 14 J. Lee 15 M. Lettmann 12 B.D. Linh 11 J. Liu 15 Z. Liu 13 C. Lizarazo 7, 12 S. Momiyama 1, 5 K. Moschner 8 S. Nagamine 1, 5 N. Nakatsuka 16, 1 C.R. Nita 17 C. Nobs 9 L. Olivier 6 R. Orlandi 18 Z. Patel 10 Zs. Podolyak 10 M. Rudigier 10 T. Saito 1, 5 C. Shand 10 P.-A. Söderström 1 V. Vaquero 14 V. Werner 12 K. Wimmer 5 Z. Xu 15
Abstract : Neutron-rich $^{88,90,92,94}$ Se 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 deformations in neutron-rich Se isotopes.
Keywords : NUCLEI
Type de document :
Article dans une revue
Physical Review C, American Physical Society, 2017, 95, pp.41302(R). 〈10.1103/PhysRevC.95.041302〉
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S. Chen, P. Doornenbal, A. Obertelli, T.R. Rodriguez, G. Authelet, et al.. Low-lying structure and shape evolution in neutron-rich Se isotopes. Physical Review C, American Physical Society, 2017, 95, pp.41302(R). 〈10.1103/PhysRevC.95.041302〉. 〈cea-01538442〉

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