Experimental Zn-64((d)over-right-arrow, t)Zn-63 spectroscopic factors: Guidance for isospin-symmetry-breaking calculations
With the recent inclusion of core orbitals to the radial-overlap component of the isospin-symmetry-breaking (ISB) corrections for superallowed Fermi beta decay, experimental data are needed to test the validity of the theoretical model. This work reports measurements of single-neutron pickup reaction spectroscopic factors into Zn-63, one neutron away from Zn-62, the superallowed daughter of Ga-62. The experiment was performed using a 22-MeV polarized deuteron beam, a Q3D magnetic spectrograph, and a cathode-strip focal-plane detector to analyze outgoing tritons at nine angles between 10 degrees and 60 degrees. Angular distributions and vector analyzing powers were obtained for all 162 observed states in Zn-63, including 125 newly observed levels, up to an excitation energy of 4.8 MeV. Spectroscopic factors are extracted and compared to several shell-model predictions, and implications for the ISB calculations are discussed.