Emergence of O(6)-like collective structures in 80Se

Le résumé fourni par la source

The low-lying level structure of 80 Se was investigated via the 76 Ge( 9 Be,2p3n) reaction at E lab ≈ 31 MeV using a Compton-suppressed HPGe clover array, and level lifetimes were measured with the Doppler-shift attenuation method. Measured excitation energies and B ( E 2) transition strengths are reasonably well reproduced by Interacting Boson Approximation (IBA) calculations. The observed excitation-energy and transition-strength patterns associated with the σ = 5 and σ = 3 representations, together with candidate members of the σ = 1 representation, exhibit pronounced O(6)-like collective behavior in this five-boson system. The combined experimental observables and finite-boson IBA calculations indicate a surprisingly good correspondence with O(6) expectations for these selected collective structures. At the same time, the presence of low-lying 0 2 + and 2 3 + states that are not consistently accommodated within the same classification, together with a finite B ( E 2 ; 0 3 + → 2 1 + ) strength, demonstrates that the O(6) limit does not provide a complete description of the low-energy spectrum. We therefore interpret the present results as evidence for pronounced O(6)-like collective structures embedded within a more complex nuclear structure of 80 Se.

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