Abstract

The newly observed M1 states in the ( p,p') experiment on the Zr isotopes are considered within the simple shell model. The calculation with a constant strength delta function interaction reproduces the excitation energies and the slight increase of the M1 strength at small momentum transfer with mass number. We need about a factor of 2 quenching to reproduce the cross sections at small angles, which is in accordance with the general finding for magnetic transitions.

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