Excitation of Low-Lying States ofZr89by the (p, n) Reaction onY89

Abstract

Neutrons from the ($p, n$) reaction on ${}_{}{}^{89}{}_{}{}^{}\mathrm{Y}$ were investigated for the incident proton energies 5.503 and 5.770 MeV. The angular distributions of the neutrons corresponding to the ($p, n$) transitions to five low-lying states of ${}_{}{}^{89}{}_{}{}^{}\mathrm{Zr}$ were measured by the time-of-flight method in conjunction with a pulsed proton beam. The energies of the populated states are: ground state, 595±10, 1095±10, 1465±10, and 1645±10 keV. A spin and parity of ${\frac{3}{2}}^{-}$ was determined for the 1095-keV state.