Magnetic moments around the Z =40 shell closure: sup 91 Y sup m , sup 95 Zr, and sup 97 Nb

Magnetic moments around the {ital Z}=40 shell closure have been established using nuclear magnetic resonance on oriented nuclei in iron. From the resonance frequencies we established {vert bar}{mu}({sup 91}Y;9/2{sup +}){vert bar}=6.01({sub {minus}15}{sup +31}){mu}{sub {ital N}}, {vert bar}{mu}({sup 95}Zr; 5/2{sup +}){vert bar}=1.103(23){mu}{sub {ital N}}, {vert bar}{mu}({sup 97}Nb;9/2{sup +}){vert bar}=6.153(5){mu}{sub {ital N}}. The results obtained are discussed in the framework of particle-core coupling and, in more detail, using the Nilsson deformed single-particle model. It is shown that for certain deformation regions the measurement of the magnetic moment can give information on the nuclear quadrupole deformation.