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

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arxiv 2005.07837 v2 pith:AKJ3QGNY submitted 2020-05-16 nucl-ex nucl-th

U. Friman-Gayer , C. Romig , T. Hüther , K. Albe , S. Bacca , T. Beck , M. Berger , J. Birkhan
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K. Hebeler O. J. Hernandez J. Isaak S. König N. Pietralla P. C. Ries J. Rohrer R. Roth D. Savran M. Scheck A. Schwenk R. Seutin V. Werner
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keywords mathrmchiralcurrentsgammamagneticmeasurementorderprecision
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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 $\Gamma_{\gamma, 0^+_1 \to 1^+_1} = 8.17(14)_\mathrm{stat.}(11)_\mathrm{syst.} \mathrm{eV}$ 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.

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  1. Manifest Gauge Invariance for Structure Dependent Radiative Corrections to Processes Involving Atoms and Nuclei

    nucl-th 2025-05 accept novelty 6.0 of 10

    The paper derives a manifestly gauge-invariant decomposition of the two-photon-exchange hadronic tensor in the zero-recoil limit, enabling gauge-invariant closure and density-only approximations.

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