Selection Rules in the Odd-Even Shift of Certain Nuclear Rotational Bands

Abstract

A displacement of energy levels was observed in the K = 0 band of odd- odd deformed nuclei. It is shown that this shift is due to scattering in which the final state is obtained from the initial state by a rotation of 180 deg . This circumstance provides selection rules on the parts of the n-p residual interaction responsible for the shift. The Wigner component of the force cannot contribute to the shift. In certain cases, the contribution of all certral forces will be strongly damped allowing observation of the tensor-force scattering contribution. Numerical results are preserted. (auth)