Electromagnetic response of 12C: a first-principles calculation

Abstract

The longitudinal and transverse electromagnetic response functions of ${}^{12}$C 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 $J^{\pi }$=$2^{+}$, $0_2^{+}$ (Hoyle), and $4^{+}$ states in ${}^{12}$C are accounted for explicitly in evaluating the total inelastic strength.

Comments: 5 pages, 3 figures