Measurements of the np total cross section difference $\Delta \sigma_L$ at 1.59, 1.79 and 2.20 GeV

Measurements of energy behaviour of spin-dependentnp—observables over 1.2–3.7 GeV energy region Dubna “Delta-Sigma” Experiment

“…1. One can see that the new results smoothly connect with the lower energy data and confirm a fast decrease to zero within a 1.2-2.0 GeV energy region, observed previously [7][8][9][10].…”

“…Total errors are the quadratic sums of experimental and systematic uncertainties. The results of our earlier measurements [7][8][9][10] together with the existing AaL(np) data [4], obtained with free polarized neutrons at lower energies, are also shown in Fig. 1.…”

“…The measurements of energy dependences of the np total cross sections differences AaL(np) and Aaw(np) for parallel and antiparallel particle spins oriented longitudinally or transverse were proposed [5,6] at the beginning of the 90 th and started [7][8][9][10] in Dubna. To implement the proposed Aaa,T(np) experimental program, a large Argonne-Saclay polarized proton target (PPT) was reconstructed in Dubna [11][12][13], and a new polarized neutron beam line with suitable parameters [14,15] was constructed and tested.…”

“…Two successful data taking runs were carried out in 1995 and 1997. The energy dependence of A~L(np) was measured at 1.19, 1.59, 1.79, 2.2, 2.49, and 3.66GeV [7][8][9][10].…”