SOLVABLE MODEL FOR 3-DIMENSIONAL QUANTUM SCATTERING OF A PARTICLE OFFSEVERAL SEPARABLE INTERACTIONS CENTERED AT N ARBITRARY POINTS

A solvable model for non relativistic quantum scattering in three-dime nsional space of a particle off several interactions centred at n arbi trary points is given. The interaction at one centre can be very diffe rent from the interaction at another. Each interaction centred at a gi ven point can be effective on any partial wave with respect to this po int. Each centred interaction is a sum of projectors on a finite numbe r of partial waves relative to the centre. Elementary applications are given.