NUCLEAR ROTATION AT LOW-SPIN

Two subjeCtS related to nuclear rotation at low angular momentum are d iscussed. One is the gamma-soft ''rotation'' in a microscopic calculat ion of the IBM-2, where it will be shown that we can reproduce gamma-s oft collective levels in a microscopic IBM-2 using a standard effectiv e nucleon-nucleon Hamiltonian. The other is about the rotation of the axially-symmetric rotor. It is shown that, in and near the ground stat e, the proton and neutron deformed ellipsoids are rotating in the oppo site directions, whereas they rotate about almost the same axis in sta tes of higher spins. This holds, quite similarly, for angular-momentum -projected Nilsson wave functions and for wave functions in the Intera cting Boson Model.