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Abstract:
Through measuring high-fold prompt γ-ray coincidence events following the spontaneous fission of 252Cf with the Gammasphere detector array, new level scheme in the very neutron-rich 108Ru nucleus has been established. The ground-state band,the one-phone γ-vibrational band and a two-quasi-particle band have been confirmed and expanded. Besides, a two-phonon γ-vibrational band has been identified. From cranked shell model calculations, 108Ru nucleus may have triaxial deformation with parameters β2~0.29, γ=-22° and the band crossing in the yrast band is due to the alignment of two h11/2 neutrons. The possible configurations for the two-quasiparticle collective band were also discussed.
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