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Charge form factor and sum rules of electromagnetic response functions in 12C
A Lovato1, S Gandolfi, Ralph Butler
1Argonne Leadership Computing Facility, Argonne National Laboratory, Argonne, Illinois 60439, USA and Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Abstract:
An ab initio calculation of the 12C elastic form factor and sum rules of longitudinal and transverse response functions measured in inclusive (e, e') scattering are reported, based on realistic nuclear potentials and electromagnetic currents. The longitudinal elastic form factor and sum rule are found to be in satisfactory agreement with available experimental data. A direct comparison between theory and experiment is difficult for the transverse sum rule. However, it is shown that the calculated transverse sum rule has large contributions from two-body currents, indicating that these mechanisms lead to a significant enhancement of the quasielastic transverse response. This fact may have implications for the anomaly observed in recent neutrino quasielastic charge-changing scattering experiments on 12C.
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