Measurement of the Difference in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>pn</mml:mi></mml:math>Total Cross Sections in Pure Longitudinal Spin States

Auer, I.P.; Ditzler, W. R.; Hill, D.; Spinka, H.; Tamura, N.; Theodosiou, G.; Toshioka, K.; Underwood, D. G.; Wagner, R. G.; Yokosawa, A.

doi:10.1103/physrevlett.46.1177

Cited by 33 publications

(9 citation statements)

References 22 publications

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“…The quasielastic pn data from Ref. [15] (not shown here) are in good agreement with the Dubna results. The solid curves represent the evolution of the PSǍ ts of −∆σ L (np) Å FA95, SP99 and SP03 GW/VPI PSA solutions [46,47] • Calculations using the energy dependent (ED) GW/VPI PSA [47] (solution SP03).…”

Section: Resultssupporting

confidence: 78%

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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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Section: Resultssupporting

confidence: 78%

“…∆σ L (pn) results from 0.51 to 5.1 GeV were deduced for theˇrst time in 1981 from the ∆σ L (pd) and ∆σ L (pp) measurements at the ANLÄZGS [15]. These pn results were omitted in many existing PSA databases due to uncertainties in the Glauber-type rescattering corrections.…”

Section: Introductionmentioning

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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“…In some cases, the existing data have been rounded to fewer significant digits than are given in the original references. with the Argonne A a~( n p ) data as derived from A u~( p d ) [25]. The source of this discrepancy is not known, but it may be related to the forward NN -+ NN amplitudes used to obtain A u~( n p ) from the A u~( p d ) measurements.…”

Section: Results and Interpretationmentioning

confidence: 98%

“…Because of the momentum spread of nucleons in the deuteron ( z ;I60 MeV/c), these results represented averages over a range of neutron energies. In the energy range up to 1 GeV, the values of AaL(np) did not show any pronounced structure; so when AuL(I=O) was extracted with AuL(I=O) = 2 A u~( p n ) -A a~( p p ) , the behavior of A a~( p p ) = A u L ( I =~) resulted in mirrorlike structure in AUL (I=O) [25]. A dispersion-relation analysis of this structure [26] found evidence for an abnormal-parity dibaryon ( I + , 3+, .…”

Section: Introductionmentioning

confidence: 96%

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Measurement of the longitudinal spin-dependent neutron-proton total cross-section difference ΔσL(np) between 500 and 800 MeV

Beddo¹,

Burleson²,

Ja³

et al. 1994

Phys. Rev. D

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A measurement of AuL(np), the difference between neutron-proton total cross sections for pure longitudinal spin states, is described. Data were taken at LAMPF for five neutron beam kinetic energies: 484, 568, 634, 720, and 788 MeV. The statistical errors are in the range 0.64-1.35 mb. Various sources of systematic effects were investigated and are described. Overall systematic errors are estimated to be on the order of 0.5 mb and include an estimate for the uncertainty in the neutron beam polarization. The AUL results are consistent with previous results from PSI and Saclay. These data, when combined with other results and fitted to a Breit-Wigner curve, are consistent with an elastic 1=0 resonance with mass 2214 i 15 (stat) f 6 (syst) MeV and width 75 i 21 f 12 MeV. TNow at 127 Eastgate, Los Alamos, New Mexico 87544. derstanding of the NN interaction a t energies below pion production threshold (about 300 MeV), which is the region of "conventional" nuclear physics, where elastic scattering dominates. The d a t a for both proton-proton (pp) and neutron-proton (np) scattering are fairly copious a t these energies and are generally self-consistent. From a theoretical point of view, quantitative success has been achieved in describing this process in terms of potentials based on field-theoretic formalism involving meson exchange. Among these are the Paris [I], Bonn 121, and Argonne [3] potentials. A review of this work has been given by Machleidt [4]. Other theoretical studies include Skyrme [5,6] and quark [7,8] models. T h e current status of these models has been reviewed by Vinh Mau [9].At energies u p t o about 1 GeV, where pion production and excitation of the A(1232) resonance are possible, the situation is not so well understood, however.

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Elastic Scattering of Polarized Neutrons on Polarized Protons at Saturne II

Lehar

1991

High Energy Spin Physics

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Measurement of the Difference inpnTotal Cross Sections in Pure Longitudinal Spin States

Cited by 33 publications

References 22 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

Measurement of the longitudinal spin-dependent neutron-proton total cross-section difference ΔσL(np) between 500 and 800 MeV

Elastic Scattering of Polarized Neutrons on Polarized Protons at Saturne II

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