Abstract
The shell structure underlying shape changes in neutron-rich nuclei between and has been investigated by a novel application of the transient field technique to measure the first-excited state factors in and produced as fast radioactive beams. Details of the new methodology are presented. In both and there is a fine balance between the proton and neutron contributions to the magnetic moments. Shell-model calculations that describe the level schemes and quadrupole properties of these nuclei also give a satisfactory explanation of the factors. In the factor is extremely sensitive to the occupation of the neutron orbit above the shell gap as occupation of this orbit strongly affects the proton configuration. The factor of deformed does not resemble that of a conventional collective nucleus because spin contributions are more important than usual.
9 More- Received 9 August 2006
DOI:https://doi.org/10.1103/PhysRevC.74.054307
©2006 American Physical Society