Quenching of Stretched Magnetic Transitions

Quenching of the $M6\mathrm{}$ transition strengths in inelastic scattering to $6^{-}$ states in ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ is predicted when the $d_{\frac{5}{2}}$ shell-model space is enlarged to include the $s_{\frac{1}{2}}$ single-particle orbital. Nucleon transfer cross sections to the yrast $\mathrm{}(I,T)=(6^{-},0) \mathrm{and} (6^{-},1)$ states and $B\left(M1\mathrm{}\right)\mathrm{}$ between them are also predicted to decrease when the extended space is used. The calculations suggest that the data may be understood in terms of only nucleon degrees of freedom once an adequate model space is used.