Quantum Monte Carlo calculations of magnetic moments and M1 transitions in A<=7 nuclei including meson-exchange currents

TL;DR

This paper employs Green's function Monte Carlo methods with realistic nuclear potentials to calculate magnetic moments and M1 transitions in light nuclei, incorporating meson-exchange currents to improve agreement with experimental data.

Contribution

It introduces a consistent way to include meson-exchange currents in Monte Carlo calculations for light nuclei, enhancing the accuracy of magnetic property predictions.

Findings

MEC contributions increase isovector magnetic moments by 16%.

MEC contributions enhance M1 transition rates by 17-34%.

Results align well with experimental measurements.

Abstract

Green's function Monte Carlo calculations of magnetic moments and M1 transitions including two-body meson-exchange current (MEC) contributions are reported for A<=7 nuclei. The realistic Argonne v18 two-nucleon and Illinois-2 three-nucleon potentials are used to generate the nuclear wave functions. The two-body meson-exchange operators are constructed to satisfy the continuity equation with the Argonne v18 potential. The MEC contributions increase the A=3,7 isovector magnetic moments by 16% and the A=6,7 M1 transition rates by 17--34%, bringing them into very good agreement with the experimental data.