Neutron-proton scattering in the context of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>d</mml:mi><mml:mo>*</mml:mo></mml:msup></mml:math>(2380) resonance

New data on quasifree polarized neutron-proton scattering in the region of the recently observed ${d}^{*}$ resonance structure are obtained by exclusive and kinematically complete high-statistics measurements with WASA at COSY. This paper details the determination of the beam polarization, checks of the quasifree character of the scattering process, on all obtained ${A}_{y}$ angular distributions and on the new partial-wave analysis, which includes the new data producing a resonance pole in ${}^{3}{D}_{3}\ensuremath{-}{}^{3}{G}_{3}$ coupled partial waves at ($2380\ifmmode\pm\else\textpm\fi{}10\ensuremath{-}i40\ifmmode\pm\else\textpm\fi{}5$) MeV---in accordance with the ${d}^{*}$ dibaryon resonance hypothesis. The effect of the new partial-wave solution on the description of total and differential cross-section data as well as specific combinations of spin-correlation and spin-transfer observables available from COSY-ANKE measurements at ${T}_{d}=2.27$ GeV is discussed.