ALGEBRAIC ROTATING-FRAME APPROACH TO NUCLEAR-REACTIONS

An approach to nuclear reactions is discussed in which the rotating-fr ame approximation is combined with an algebraic model of the nuclear c ollective states, the interacting-boson model. The coupled multi-chann el problem reduces to that of single-channel potential scattering with a fluctuating potential, whose strength is characterized by a finite set of values. Several versions of the rotating-frame approximation ar e compared with an exact coupled-channel calculation for the inelastic scattering of an cu-particle from Sm-154. It is shown that an appropr iate choice of the version used, together with a proper normalization of the coupling strength, leads to a significant improvement upon the conventional form of this approximation when Coulomb excitation is inc luded.