Nuclear Structure Studies in ⁹⁰Y

Differential cross sections (12.5° to 47.5°) were measured for the ⁸⁹Y (d,p) reaction with 33.3 Mev deuterons from the Oak Ridge Isochronous Cyclotron. Proton spectra up to 5 Mev excitation in the ⁹⁰Y were observed in nuclear emulsions exposed in the focal plane of the broad range spectrograph. The resolution was approximately 25 Kev. The excitation energies agreed within experimental error with (d,p) experiments at 12 Mev and 15 Mev. Comparisons were made with DWBA calculations and ℓ-transfers were assigned to 25 levels. The ℓ-transfers and spectroscopic factors are in satisfactory agreement with previous papers for most strong transitions. However, the states at 1.962 and 2.245 Mev are found to be populated by ℓ=5 transitions, and if given spins of 5⁺ and 6⁺, respectively, have spectroscopic factors of 0.28 and 0.26. Several other previously unreported states were observed and ℓ-transfers were assigned to some of them.