Abstract
A rotational band based on the proton [ital h][sub 11/2] orbital has been observed to high spin (79/2[h bar]) and high rotational frequency ([h bar][omega][congruent]1.0 meV) in the nucleus [sub 51][sup 113]Sb. The measured transition quadrupole moment is [ital Q][sub 0]=4.4[plus minus]0.6 [ital e] b, consistent with an axial prolate deformation of [beta][sub 2][congruent]0.32. A large interaction strength (360[plus minus]60 keV) has been measured for the rotational alignment of [ital h][sub 11/2] neutrons which, together with a considerable delay in the crossing frequency ([Delta][h bar][omega][congruent]0.09 MeV), is construed as the first direct evidence of a large high-[ital j] proton-neutron interaction.
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