NN(${}^1{S}_0$) pairs in ${}^3$He and in p${}^3$He backward elastic scattering

Yu. N. Uzikov, J. Haidenbauer

It is shown that the shoulder observed in the cross section of $p^{3}He$ backward elastic scattering at proton beam energies of 0.4 -- 0.7 GeV can be explained by the mechanism of vi…