Role of chiral two-body currents in ${}^6$Li magnetic properties in light of a new precision measurement with the relative self-absorption technique

Abstract

A direct measurement of the decay width of the excited $0_1^{+}$ state of ${}^6$Li using the relative self-absorption technique is reported. Our value of ${\Gamma }_{\gamma ,0_1^{+}\to 1_1^{+}}=8.17(14{)}_{stat.}(11{)}_{syst.}\mathrm{eV}$ provides sufficiently low experimental uncertainties to test modern theories of nuclear forces. The corresponding transition rate is compared to the results of ab initio calculations based on chiral effective field theory that take into account contributions to the magnetic dipole operator beyond leading order. This enables a precision test of the impact of two-body currents that enter at next-to-leading order.

arXiv comment7 pages, 3 figures

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• The Role of Ab Initio Beta-Decay Calculations in Light Nuclei for Probes of Physics Beyond the Standard Model