2 research outputs found
Model-independent analysis of the neutron-proton final-state interaction region in the pp -> pn pi^+ reaction
Experimental data on the pp -> pn pi^+ reaction measured in an exclusive
two-arm experiment at 800 MeV show a narrow peak arising from the strong
proton-neutron final-state interaction. It was claimed, within the framework of
a certain model, that this peak contained up to a 25% spin-singlet final state
contribution. By comparing the data with those of pp -> d pi^+ in a largely
model-independent way, it is here demonstrated that at all the angles measured
the whole of the peak could be explained as being due to spin-triplet final
states, with the spin-singlet being at most a few percent. Good qualitative
agreement with the measured proton analysing power is also found within this
approach.Comment: 10 pages including 3 eps figure
Singlet-to-triplet ratio in the deuteron breakup reaction at 585 MeV
Available experimental data on the exclusive reaction at 585 MeV
show a narrow peak in the proton-neutron final-state interaction region. It was
supposed previously, on the basis of a phenomenological analysis of the shape
of this peak, that the final spin-singlet state provided about one third
of the observed cross section. By comparing the absolute value of the measured
cross section with that of elastic scattering using the F\"aldt-Wilkin
extrapolation theorem, it is shown here that the data can be
explained mainly by the spin-triplet final state with a singlet admixture of a
few percent. The smallness of the singlet contribution is compatible with
existing data and the one-pion exchange mechanism of the reaction.Comment: 10 pages, Latex, 2 Postscript figure