Three-nucleon force effects in polarization transfers from the doubly spin-polarized initial neutron-deuteron state to the outgoing neutron in neutron-deuteron scattering

We discuss new spin observables presently accessible to measurement in the proton-deuteron ($\mathit{pd}$) system, namely polarization transfer coefficients from the doubly spin-polarized initial state to the outgoing nucleon in the elastic nucleon-deuteron ($\mathit{Nd}$) scattering and in the nucleon-induced deuteron breakup reactions. The sensitivity of these observables to three-nucleon force ($3N\mathrm{F}$) effects is investigated and compared to sensitivities of the constituent standard single polarization transfer coefficients in the neutron-deuteron ($\mathit{nd}$) system. ${K}_{y,y}^{{y}^{\ensuremath{'}}}$ in elastic $\mathit{nd}$ scattering, for which large $3N\mathrm{F}$ effects, up to 40%, have been found at higher energies, seems the most promising observable to measure.