Search for parity nonconservation in the compound nucleus reaction via an isobaric analog resonance using a thick target

Abstract

Parity nonconservation in the compound nucleus reaction via the isobaric analog resonance in 90 Zr+p (E R=5.92 MeV, J π= 1 2 +) was searched for by measuring the longitudinal analyzing power A z of the elastic scattering protons. Using a thick target the excitation function of A p from E p =5.60 to 6.05 MeV was simultaneously measured from the difference of the spectral shapes of back scattered protons for positive and negative beam helicities. No explicit parity violation was observed down to A z ≈3×10 −4.