Isobaric-Analog Study of Zr90

Abstract

Proton-induced analog resonance reactions have been studied using the target $^{90}\mathrm{Zr}$. Excitation functions were measured for elastic and inelastic protons at angles of 70\ifmmode^\circ\else\textdegree\fi{}, 110\ifmmode^\circ\else\textdegree\fi{}, 130\ifmmode^\circ\else\textdegree\fi{}, 150\ifmmode^\circ\else\textdegree\fi{}, and 170\ifmmode^\circ\else\textdegree\fi{}. The inelastic groups detected result from the ${0}^{+}$ (1.75-MeV), ${2}^{+}$ (2.18-MeV), ${5}^{\ensuremath{-}}$ (2.32-MeV), and the unresolved ${4}^{\ensuremath{-}}$ and ${3}^{\ensuremath{-}}$ (2.75-MeV) states in $^{90}\mathrm{Zr}$. In addition, proton inelastic angular distributions have been taken on and off the more prominent resonances. In order to separate the resonances attributed to the ${4}^{\ensuremath{-}}$ and ${3}^{\ensuremath{-}}$ (2.75-MeV) proton group, excitation of the ${4}^{\ensuremath{-}}$ to ${5}^{\ensuremath{-}}$ and ${3}^{\ensuremath{-}}$ to ${2}^{\ensuremath{-}}$ $\ensuremath{\gamma}$ rays were measured in a 26-${\mathrm{cm}}^{3}$ Ge(Li) detector.