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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 112Ru nucleus has been established.The ground-state band and the one-phonon γ-vibrational band have been confirmed and extended with spin up to 16h and 15h, respectively. The other two side bands, one proposed as two-phonon γ-vibrational band and another proposed as two-quasiparticle band, have been identified for the first time. From cranked shell model calculations, 112Ru nucleus may have triaxial deformation with parameters β2~0.27, γ~-29° and the band crossing in the yrast band is due to the alignment of two h11/2 neutrons. The characteristics for the quasiparticle band and γ-vibrational bands have also been discussed.
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