Low-lying structure and shape evolution in neutron-rich Se isotopes - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Physical Review C Year : 2017

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

P. Doornenbal
  • Function : Author
H. Baba
  • Function : Author
T. Motobayashi
  • Function : Author
H. Sakurai
D. Steppenbeck
  • Function : Author
Uesaka T.
  • Function : Author
I. Stefan
R. Caroll
  • Function : Author
F. Flavigny
J. Lee
  • Function : Author
J. Liu
  • Function : Author
Z. Patel
  • Function : Author
M. Rudigier
  • Function : Author
C. Shand
  • Function : Author
Z. Xu
  • Function : Author

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.

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Dates and versions

cea-01538442 , version 1 (13-06-2017)

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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, 2017, 95, pp.041302(R). ⟨10.1103/PhysRevC.95.041302⟩. ⟨cea-01538442⟩
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