Linear-polarization measurements of the reactionγrays fromZr96(O18,4nγ)Cd110

Abstract

The strong linear polarizations of the deexcitation $\gamma$ rays from the ${}_{}{}^{96}{}_{}{}^{}\mathrm{Zr}({}_{}{}^{18}{}_{}{}^{}\mathrm{O},4n\gamma ){}_{}{}^{110}{}_{}{}^{}\mathrm{Cd}$ reaction at 60 MeV were measured using a Ge(Li) two-crystal Compton polarimeter. Previous experiments with this reaction resulted in the identification of a side band feeding into the known $4^{+}$ and $6^{+}$ states via two dipolar $\gamma$ rays from states with spins 5 and 7 and with energies of 996 and 399 keV, respectively. These two dipole transitions were found to be $E1\mathrm{}$. Several other known quadrupole transitions were found to be $E2\mathrm{}$. Thus we assign odd parity to the levels at 2538 keV ($5^{-}$), 2878 keV ($7^{-}$), and 3344 keV ($9^{-}$). The feasibility of such measurements with this polarimeter is discussed.