In the impulse approximation, the analyzing powers and spin correlations of the dd to npd breakup equal those of pd elastic scattering up to constant factors 1, 2/3, or zero.
Double spin correlations in the reaction dd->pnpn and in the pn-elastic scattering
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abstract
An unexpectedly large double spin correlation with a sharp dependence on energy, found in elastic proton-proton scattering at large angles in the c.m.s. energy range $\sqrt{s_{pp}}= 3 \div 5.5$ GeV, may be associated with the formation of exotic eight-quark resonances at the thresholds of the strangeness and charm production. For a deeper understanding of the dynamics of this process it is important to measure double spin correlation in elastic $pn$ scattering in the same kinematics. The possibility of obtaining this data from the reaction $d d\to pnp$ with two polarized deuterons on NICA SPD is considered in this paper.
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Relations between spin observables of the reactions $dd\to npd$ and $pd\to pd$ in impulse approximation
In the impulse approximation, the analyzing powers and spin correlations of the dd to npd breakup equal those of pd elastic scattering up to constant factors 1, 2/3, or zero.