Study of the ⁹¹Zr(d, ³He)⁹⁰Y reaction

The ⁹¹Zr(d, ³He) reaction was studied at a deuteron energy of 28 MeV. Angular distributions were measured from 13° to 47°; l_p values were extracted for the prominent lines of ⁹⁰Y. The l_p values and transition strengths were determined by DWBA analysis. The angular distributions for the (πp _{1 2})(νd _{5 2}) doublet (g.s. and 0.20 MeV state) exhibit the characteristic l = 1 shape. States at 1.42, 1.57, 1.64 and 1.81 MeV were also populated strongly in the (d, ³He) reaction; the 1.42, 1.57 and 1.81 MeV levels contain l= 1 transition strength and are most likely members of the (πp _{3 2}^-1)(νd _{5 2}) multiplet. The 2.03 MeV state has a characteristic l = 3 angular distribution and is suggested to be the only member of the (πf _{3 2}^-1)(νd _{5 2}) sextet to be unambiguously observed in this study, most probably the 5^- or 4^- member. The members of the (πg _{5 2})(νd _{9 2}) sextet were populated weakly (less than 100 μb/sr) in this reaction.