Cross Sections for Elementary Particle Interactions

Barashenkov, V.S.; Mal'tsev, V. M.

doi:10.1002/prop.19610091102

Cited by 80 publications

(13 citation statements)

References 295 publications

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“…Our results are shown in Figs. 3 and 4, where they are compared with existing data, listed in compilations [42,43,44] for np and in [45] for nC interactions. …”

mentioning

confidence: 99%

Measurements of the total-cross-section difference Δσ L(np) at 1.39, 1.69, 1.89, and 1.99 GeV

et al. 2005

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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. Â 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 ÃýÂ 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...

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“…Our results are shown in Figs. 3 and 4, where they are compared with existing data, listed in compilations [42,43,44] for np and in [45] for nC interactions. …”

mentioning

confidence: 99%

Measurements of the total-cross-section difference Δσ L(np) at 1.39, 1.69, 1.89, and 1.99 GeV

et al. 2005

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“…The downward trend of the p, pn reactions with increasing energy contrasts with the upward trend for p, 2p reactions. As also shown, the free proton-proton cross section drops only from "'" 29 to "'" 23 mb across this energy range (presumably true also for the free neutron-neutron cross section), while the free proton-neutron cross section drops more rapidly, from "",71 mb to ""'32 mb (23,117) . If the mean free path for attenuation is inversely proportional to the appro priately averaged free-nucleon, free-nucleon cross sections, it does not seem to vary sufficiently between neutrons and protons to explain the marked difference between p, pn and p, 2p excitation functions.…”

Section: Clean Knockoutmentioning

confidence: 81%

“…In collisions between free nu cleons, the practical threshold for pion formation is about 350 MeV (23,117) : the fraction of collisions producing pions then rises rapidly and exceeds one half above about 1 GeV. We therefore expect that "clean knockout" p, pn reactions can include such processes as p, 2mr+, p, pmro, p, pn7r+7r-, etc., and that the "inelastic scattering" and "charge-exchange scattering" parts of the "ISE" and "CESE" mechanisms can include such reactions as p, n7r+ and p, P7r-, etc.…”

Section: Energies Greater Than 400 Mevmentioning

confidence: 98%

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Nucleon, Two-Nucleon Reactions Above 100 MEV

Grover¹,

Caretto²

1964

Annu. Rev. Nucl. Sci.

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“…The present results would indicate the existence of some interaction out to distances of 2 F. This interaction is small compared to the "core" interaction, being only about 0.5 mb out of a total n-p cross section of some 40 mb. 7 However, because the charge-exchange process is insensitive to shadow scattering, which dominates direct elastic scattering at small angles, it would seem to provide a particularly sensitive probe for measuring a long weak tail in the nucleon-nucleon interaction.…”

mentioning

confidence: 99%

n−pElastic Charge Exchange in the BeV Energy Region

et al. 1962

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DECEMBER 15, 1962 (1962)] or in the K ~K system [S. Minami, Progr. Theoret. Phys. (Kyoto) 27, 215(1962)]. 5 If the Z particle is regarded as a bound state in the N -N system, it would then correspond to the 3 3 P 0 state.For an explanation of the notation, see the first paper cited in reference 4. 6 Another possible reaction mechanism is one in which the incident K~ meson interacts directly with the nucleon and a K meson is produced through a Yukawa-type interaction without any KK interaction.The n-p elastic charge-exchange cross section is expected, on the basis of isotopic -spin considerations, to decrease with increasing nucleon energy because the total cross sections for n-p and/)-/? approach equality with increasing energy. The highest energy charge-exchange measurements were reported by Larsen 1 at 710 MeV. He found the differential center-of-mass cross section at zero degrees to equal 6.3 mb/sr. In the BeV energy region the search for nucleon charge-exchange events has usually been ancillary to some other measurement. 2 This has resulted in little positive information, except for the conclusion that the charge-exchange cross section is small. We have measured this process at 2.04 and 2.85 BeV using the Cosmotron at Brookhaven.The experimental arrangement of the apparatus is shown in Fig.

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Cross Sections for Elementary Particle Interactions

Cited by 80 publications

References 295 publications

Measurements of the total-cross-section difference Δσ L(np) at 1.39, 1.69, 1.89, and 1.99 GeV

Measurements of the total-cross-section difference Δσ L(np) at 1.39, 1.69, 1.89, and 1.99 GeV

Nucleon, Two-Nucleon Reactions Above 100 MEV

n−pElastic Charge Exchange in the BeV Energy Region

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