GIANT-RESONANCE EXCITATION BY 130 MEV HE-3

Energy spectra of 130 MeV 3He scattered from 24Mg, 90Zr, 120Sn and 208Pb have been measured. The spectra exhibit a pronounced giant resonance (GR) structure in the excitation energy region around Ex ≈ 63A- 1 3MeV. The GR angular distributions as well as those corresponding to the first 2+ levels in 24Mg and 120Sn have been obtained for angles 7° ≦ θL ≦ 35°. Distorted wave calculations using the optical model parameters fitting the elastic data resulted in good fits to the 2+ levels. For 24Mg, 90Zr and 120Sn the shapes of the GR angular distributions are well fitted by L = 2 curves alone. However, for 208Pb both L = 2 and L = 4 curves give fits of comparable quality. © 1979.