YRAST-YRARE INTERACTION STRENGTH

It is well-known that the sharpness of the first backbending in nuclear yrast spectra depends on the magnitude of the interaction strength between the yrast band and the yrare band, which has a large spin-alignment. Bengtsson, Hamamoto and Mottelson pointed out that in the HFB calculation for a single-j cranking shell model (CSM) the yrast-yrare interaction strength is a periodic function of the Fermi energy, λ, and thus a sharp backbending might be expected not only at the bottom