Elsevier

Nuclear Physics A

Volume 265, Issue 2, 19 July 1976, Pages 291-300
Nuclear Physics A

Evidence of an isoscalar E3 giant resonance in 16O

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Abstract

Differential cross sections and analyzing powers for the inelastic scattering of polarized protons from 16O leading to the 2− state at 8.88 MeV excitation have been measured at incident energies of 31.7, 33.8, 35.8, 36.8 and 39.9 MeV. These data have been analyzed using a distorted wave theory in which the effects of virtual excitation of E1, E2 and E3 giant resonances as doorway states are included explicitly. This analysis shows that the strong energy variation in the data between 30 and 40 MeV may be predominantly due to a new isoscalar E3 resonance with the contributions from the E1 and E2 resonances corroborating earlier findings.

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