New results for the np spin-dependent total cross section difference AaL(np) at neutron beam kinetic energies of 1.59, 1.79 and 2.20 GeV are presented. Measurements of the AaL (rip) energy dependence were carried out at the Synchrophasotron of the Laboratory *) e-marl: sharovOsunhe.jinr.ru t) Deseased Czechoslovak Journal of Physics, Vol. 50 (2000), Suppl. S1 325 V.I.Sharov e~ al. of High Energies of the Joint Institute for Nuclear Research in Dubna. The values of AO'L were measured as a difference between the np total cross sections for parallel and antiparallel beam and target polarizations, both oriented along the beam momentum.A fast decrease of AaL(np) with increasing energy above 1.1 GeV, as it was first seen from our previous data, was confirmed. The new results are also compared with model predictions and with the phase shift analysis fits. The AO'L quantities for isosinglet state I=0, deduced from the measured values of AaL(np) and known AO'L(pp) data, are given.
New accurate results of the neutron-proton spin-dependent total cross-section difference Ds L np ( )at the neutron beam kinetic energies of 1.39, 1.69, 1.89 and 1.99 GeV are presented. In general these data complete the measurements of energy dependence of Ds L ( ) np over the Dubna Synchrophasotron energy region. The quasi-monochromatic neutron beam was produced by break-up of extracted polarized deuterons. The deuteron (and hence neutron) polarization direction was flipped every accelerator burst. The neutron vertical direction of polarization was rotated onto the neutron beam direction and longitudinally (L) polarized neutrons were transmitted through the large proton L-polarized target. The longitudinal target polarization direction was inverted after 1-2 days of measurements. Four different combinations of the beam and target parallel and antiparallel polarization directions, both oriented along the neutron beam momentum, were used at each energy. A fast decrease of -Ds L ( ) np with increasing energy above 1.1 GeV and a structure in the energy dependence around 1.8 GeV, first observed from our previous data, seem to be well revealed. The new results are also compared with model predictions and with phase shift analysis fits. The Ds L quantities for isosinglet state I =0, deduced from the measured Ds L ( ) np values and known Ds L ( ) pp data, are also given. The results of the measurements of unpolarized total cross sections s 0tot ( ) np at 1.3, 1.4 and 1.5 GeV and s 0tot ( ) nC at 1.4 and 1.5 GeV are presented as well. These data were obtained using the same apparatus and high intensity unpolarized deuteron beams extracted either from the Synchrophasotron, or from the Nuclotron.The investigation has been performed at the Veksler and Baldin Laboratory of High Energies, JINR. Ïðåäñòàâëåíû íîâûå òî÷íûå ðåçóëüòàòû èçìåðåíèé ñïèí-çàâèñèìîé ðàçíîñòè ïîëíûõ íåéòðîí-ïðîòîííûõ ñå÷åíèé Ds L ( ) np ïðè êèíåòè÷åñêèõ ýíåðãèÿõ íåéòðîíîâ 1,39; 1,69; 1,89 è 1,99 ÃýÂ.  îñíîâíîì, ýòè äàííûå çàâåðøàþò èçìåðåíèÿ ýíåðãåòè÷åñêîé çàâèñèìîñòè Ds L ( ) np â îáëàñòè ýíåðãèé äóáíåíñêîãî ñèíõðîôàçîòðîíà. Ïî÷òè ìîíîõðîìàòè÷åñêèé íåé-òðîííûé ïó÷îê ïîëó÷àëñÿ ïðè ðàçâàëå âûâåäåííûõ èç ñèíõðîôàçîòðîíà âåêòîðíî-ïîëÿðèçî-âàííûõ äåéòðîíîâ. Çíàê ïîëÿðèçàöèè äåéòðîíîâ (à ñëåäîâàòåëüíî, è íåéòðîíîâ) ìåíÿëñÿ îò öèêëà ê öèêëó. Âåðòèêàëüíàÿ îðèåíòàöèÿ ïîëÿðèçàöèè íåéòðîíîâ ïîâîðà÷èâàëàñü ïî íàïðà-âëåíèþ íåéòðîííîãî ïó÷êà, è ïðîäîëüíî-ïîëÿðèçîâàííûå íåéòðîíû ïðîïóñêàëèñü ÷åðåç áîëü-øóþ ïðîäîëüíî-ïîëÿðèçîâàííóþ ïðîòîííóþ ìèøåíü. Íàïðàâëåíèå ïðîäîëüíîé ïîëÿðèçàöèè ìèøåíè èíâåðòèðîâàëîñü ñïóñòÿ 1-2 ñóò èçìåðåíèé. Áûñòðûé ñïàä -Ds L ( ) np ñ ðîñòîì ýíåðãèè âûøå 1,1 Ãý è ñòðóêòóðà â ýíåðãåòè÷åñêîé çàâèñèìîñòè âîêðóã 1,8 ÃýÂ, âïåðâûå íàáëþäåí-íûå â áîëåå ðàííèõ èçìåðåíèÿõ, êàaeóòñÿ ÿâíî âûðàaeåííûìè. Íîâûå äàííûå ñðàâíèâàþòñÿ ñ ìîäåëüíûìè ïðåäñêàçàíèÿìè è ñ ðåøåíèÿìè ôàçîâîãî àíàëèçà. Ïðèâîäÿòñÿ çíà÷åíèÿ Ds L äëÿ èçîñèíãëåòíîãî ñîñòîÿíèÿ I =0, ïîëó÷åííûå èç èçìåðåííûõ Ds L ( ) np -âåëè÷èí è èçâåñòíûõ Ds L ( ) pp -äàííûõ. Ïðåäñòàâëåíû òàêaeå ðåçóëüòàò...
New accurate data on the neutron-proton spin-dependent total cross section difference ACrL(np) at the neutron beam kinetic energies 1.4, 1.7, 1.9 and 2.0 GeV are presented. A number of physical and methodical results on investigation of an elastic np ---* pn charge exchange process over a few GeV region are also presented. Measurements were carried *)
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