Decoupling Parameter for Rotational Bands Based on Mixed-Symmetry States

Abstract

The energy as determined experimentally for the first excited 2⁺ state of the ¹⁵⁶Gd rotational band based on the mixed-symmetry state is extremely small in relation to characteristic values of this energy in deformed nuclei. The possibility of explaining this experimental fact by a large value of the decoupling parameter is explored. The result is that the decoupling-parameter values obtained under various assumptions on the structure of the mixed-symmetry state are too small for explaining the experimental excitation energy of the state in question.