Elsevier

Nuclear Physics A

Volume 254, Issue 1, 1 December 1975, Pages 156-168
Nuclear Physics A

Spin-flip measurements in the proton inelastic scattering on 12C and giant resonance effects

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Abstract

Differential cross sections and spin-flip probabilities (SFP) for the inelastic scattering of protons, exciting the 2+ state at 4.43 MeV in 12C, have been measured at several incident energies between 15.9 and 37.6 MeV. The changes in the shape of the SFP angular distributions are rather limited, while the absolute values show a pronounced increase, resonant like, in two energy regions centered at about 20 and 29 MeV. The second resonance reproduces very closely the energy dependence of the E2 giant quadrupole strength found in a previous experiment. The resonance at 20 MeV should correspond to a substructure of the E1 giant dipole resonance.

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    Present address: Istituto di Fisica dell'Università, Torino.

    ††

    Permanent address: Instituto di Fisica dell′Università, Milano.

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