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We report on a precise measurement of double-polarization asymmetries inelectron-induced breakup of $^3\mathrm{He}$ proceeding to $\mathrm{pd}$ and$\mathrm{ppn}$ final states, performed in quasi-elastic kinematics at $Q^2 =0.25\,(\mathrm{GeV}/c)^2$ for missing momenta up to $250\,\mathrm{MeV}/c$.These observables represent highly sensitive tools to investigate theelectromagnetic and spin structure of $^3\mathrm{He}$ and the relativeimportance of two- and three-body effects involved in the breakup reactiondynamics. The measured asymmetries cannot be satisfactorily reproduced bystate-of-the-art calculations of $^3\mathrm{He}$ unless their three-bodysegment is adjusted, indicating that the spin-dependent part of the nuclearinteraction governing the three-body breakup process is much smaller thanpreviously thought.

Measurement of double-polarization asymmetries in the quasi-elastic $^3\vec{\mathrm{He}}(\vec{\mathrm{e}},\mathrm{e}'\mathrm{p})$ process