Review of quasi-elastic charge-exchange data in the nucleon-deuteron breakup reaction

Lehar, F.; Wilkin, C.

doi:10.1134/s1547477110040035

Cited by 3 publications

(3 citation statements)

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“…Whereas the unpolarised differential cross section is correctly predicted in impulse approximation at the three lower energies, this gives a result that is about 15% too high at 2.27 GeV. Such a factor is in fact consistent with the discrepancy between the SAID np predictions and the data in the charge-exchange region [2], taking into account the SAID overestimation of the spin-flip contributions, as measured in the inclusive R np (0) experiment [4,5].…”

Section: Introductionsupporting

confidence: 70%

“…Extensive measurements of R np (0) have been reported and these have recently been extended up to 2 GeV at Dubna [4]. Although impulse approximation predictions for R np (0) on the basis of the current SAID amplitudes reproduce well these observations from 300 MeV up to about 800 MeV, there are serious discrepancies above 1 GeV [5]. In terms of Eq.…”

Section: Introductionmentioning

confidence: 87%

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The neutron-proton charge-exchange amplitudes measured in the dp → ppn reaction

et al. 2013

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Abstract. The unpolarised differential cross section and the two deuteron tensor analysing powers Axx and Ayy of the dp → {pp}sn charge-exchange reaction have been measured with the ANKE spectrometer at the COSY storage ring. Using deuteron beams with energies 1.2, 1.6, 1.8, and 2.27 GeV, data were obtained for small momentum transfers to a {pp}s system with low excitation energy. The results at the three lower energies are consistent with impulse approximation predictions based upon the current knowledge of the neutron-proton amplitudes. However, at 2.27 GeV, where these amplitudes are far more uncertain, agreement requires a reduction in the overall double-spin-flip contribution, with an especially significant effect in the longitudinal direction. These conclusions are supported by measurements of the deuteronproton spin-correlation parameters Cx,x and Cy,y that were carried out in the d p → {pp}sn reaction at 1.2 and 2.27 GeV. The values obtained for the proton analysing power A p y also suggest the need for a radical reevaluation of the neutron-proton elastic scattering amplitudes at the higher energy. It is therefore clear that such measurements can provide a valuable addition to the neutron-proton database in the charge-exchange region. PACS

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Section: Introductionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 87%

The neutron-proton charge-exchange amplitudes measured in the dp → ppn reaction

et al. 2013

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“…[2]. This important distinction arises because the spin dependence that is made explicit here is that corresponding to charge exchange [3,11].…”

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confidence: 99%

Analysing powers and spin correlations in deuteron–proton charge exchange at 726 MeV

et al. 2015

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International audienceThe charge exchange of vector polarised deuterons on a polarised hydrogen target has been studied in a high statistics experiment at the COSY-ANKE facility at a deuteron beam energy of Td=726 MeVTd=726 MeV. By selecting two fast protons at low relative energy EppEpp, the measured analysing powers and spin correlations are sensitive to interference terms between specific neutron–proton charge-exchange amplitudes at a neutron kinetic energy of View the MathML sourceTn≈12Td=363 MeV. An impulse approximation calculation, which takes into account corrections due to the angular distribution in the diproton, describes reasonably the dependence of the data on both EppEpp and the momentum transfer. This lends broad support to the current neutron–proton partial wave solution that was used in the estimation

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