Experimental Study of the Structure of ${}_{}{}^{90}{}_{}{}^{}\mathrm{Y}$ with ${}_{}{}^{89}{}_{}{}^{}\mathrm{Y}\mathrm{}(d,p)\mathrm{}$ at 33.3 MeV and ${}_{}{}^{89}{}_{}{}^{}\mathrm{Y}(\alpha ,{}_{}{}^3{}_{}{}^{}\mathrm{He})$ at 65.7 MeV

Differential cross sections from 12.5 to 47.5° were measured for the ${}_{}{}^{89}{}_{}{}^{}\mathrm{Y}\mathrm{}(d,p)\mathrm{}$ reaction with 33.3-MeV deuterons. Proton spectra up to 5-MeV excitation in ${}_{}{}^{90}{}_{}{}^{}\mathrm{Y}$ were observed with a resolution of approximately 25 keV. The excitation energies agreed within experimental error with ($d,p$) experiments at 12 and 15 MeV. The ${}_{}{}^{89}{}_{}{}^{}\mathrm{Y}(\alpha ,{}_{}{}^3{}_{}{}^{}\mathrm{He})$ cross sections were measured at 15 and 20° with 65.7-MeV $\alpha$ particles. Comparisons were made with distorted-wave Born-approximation calculations, and $l$ transfers were assigned to many levels. The $l$ transfers and spectroscopic factors are in satisfactory agreement with previous papers for strong transitions populated by low $l$ transfers. The 33.3-MeV deuteron bombarding energy produced angular distributions permitting analysis of several states not previously interpreted or previously misinterpreted. A comparison of ($d,p$) and ($\alpha ,{}_{}{}^3{}_{}{}^{}\mathrm{He}$) results provides new information on $l=5\mathrm{}$ transitions. The transitions to states at 1.962 and 2.245 MeV, previously assigned as either $l=4\mathrm{}$ or $l=4\mathrm{} \mathrm{and} 5$, are given $l=5\mathrm{}$ assignments. New $l=5\mathrm{}$ transitions were observed to levels at 2.088, 2.517, 3.516, and 4.069 MeV, and probable $l=5\mathrm{}$ transitions were observed to levels near 2.753, 3.004, 3.160, and 3.634 MeV.