Isoscalar high-energy octupole resonance in Zr92 in inelastic electron scattering

The giant-resonance region in Zr92 has been studied by inelastic electron scattering of the effective momentum transfer range 0.65qeff 1.18 fm-1. The high-energy octupole resonance was identified at Ex=25±0.3 MeV with a width of 6.3±0.3 MeV exhausting 39±4% of the T=0 E3 energy weighted sum rule. This result is in good agreement with a recent (He3, He3') result and the recent random-phase approximation calculations, and its strength is inconsistent with the trend of low strength of the high-energy octupole resonances observed by inelastic proton scattering. NUCLEAR REACTIONS Zr92(e,e'), enriched target, E0=220 MeV, =32°-61°, q=0.65-1.18 fm-1. Measured d2ddEx up to 33 MeV in excitation energy; deduced excitation energy, width, sum rule exhaustion of isoscalar high-energy octupole resonance.