Abstract
Abstract We present experimental data on inelastic electron scattering from 12 C leading to the 2 + state at 16.11 MeV. The E2 and C2 form factors are analysed in a conventional harmonic-oscillator shell model. Several sets of nuclear structure coefficients arc extracted by adjusting the theoretical form factors to reproduce the experimental data. One is restricted to the 1p shell only and can be used for other reactions involving this level, while another one allows for the admixture of higher configurations. The implications of the Siegert theorem are also discussed. Employing the nuclear structure input we performed calculations for the process 12 C (γ, π + ) 12 B ∗ (2 + 1; 0.95 MeV ) using a nonlocal DWIA approach. The elementary pion production operator is assumed to be given by the Blomqvist-Lyget amplitude, while the final-state interaction of the existing pion is provided by an optical potential that is in agreement with pion scattering. We compare our computations with experimental data (γ, π) at a number of different photon lab energies.
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