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Electromagnetic Response of ^{12}C: A First-Principles Calculation.

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This study computes electromagnetic response functions for carbon-12 using advanced simulations. Results show excellent agreement with experiments, challenging the idea of "quenching" in nuclear responses.

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Area of Science:

  • Nuclear Physics
  • Computational Physics

Background:

  • Understanding nuclear electromagnetic response functions is crucial for nuclear structure.
  • Previous calculations often showed discrepancies with experimental data, particularly regarding response quenching.

Purpose of the Study:

  • To compute the longitudinal and transverse electromagnetic response functions of carbon-12.
  • To investigate the phenomenon of response quenching in nuclear systems.
  • To compare theoretical predictions with experimental measurements.

Main Methods:

  • Utilized a "first-principles" Green's function Monte Carlo (GFMC) method.
  • Employed realistic two- and three-nucleon interactions.
  • Incorporated associated one- and two-body currents in the calculations.

Main Results:

  • Achieved excellent agreement between theoretical calculations and experimental data for ^{12}C.
  • Found no evidence supporting the quenching of the longitudinal electromagnetic response.
  • Reanalyzed the Coulomb sum rule, explicitly including contributions from low-lying states.

Conclusions:

  • The "first-principles" GFMC approach accurately describes the electromagnetic response of carbon-12.
  • The observed agreement challenges existing theories that predict response quenching.
  • Accurate inclusion of nuclear states is vital for sum rule analyses.