Electromagnetic response of 12C: a first-principles calculation
Abstract
The longitudinal and transverse electromagnetic response functions of 12C are computed in a "first-principles" Green's function Monte Carlo calculation, based on realistic two- and three-nucleon interactions and associated one- and two-body currents. We find excellent agreement between theory and experiment and, in particular, no evidence for the quenching of measured versus calculated longitudinal response. This is further corroborated by a re-analysis of the Coulomb sum rule, in which the contributions from the low-lying Jπ\,=\, 2+, 0+2 (Hoyle), and 4+ states in 12C are accounted for explicitly in evaluating the total inelastic strength.
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