High-K multi-particle bands and pairing reduction in 254No
Abstract
The multi-particle states and rotational properties of two-particle bands in 254No are investigated by the cranked shell model (CSM) with pairing correlations treated by a particle-number conserving (PNC) method. For the first time, the rotational bands on top of two-particle Kπ=3+,8- and 10+ states and the pairing reduction are studied theoretically in 254No. The experimental excitation energies and moments of inertia for the multi-particle state are reproduced well by the calculation. Better agreement with the data are achieved by including the high-order deformation 6 which leads to enlarged Z=100 and N=152 deformed shell gaps. The rise of the J(1) in these two-particle bands compared with the ground-state band is attributed to the pairing reduction due to the Pauli blocking effects.