Measurements of the neutron-proton analyzing power in the energy range from 17 to 50 MeV

Wilczyńskí, J.; Hansmeyer, J.; Brady, F.P.; Döll, P.; Heeringa, W.; Hiebert, J. C.; Klages, H. O.; Plischke, P.

doi:10.1016/0375-9474(84)90019-8

Cited by 31 publications

(12 citation statements)

References 4 publications

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“…Figure 3 shows all relevant np analyzing-power data at 25 MeV. There is fair agreement with the less precise results published recently by Wilczynski et al 14 The accuracy of the present measurements allows the establishment of significant constraints upon existing theoretical models of the AW interaction at low energies. The predictions of the Paris potential 15 and the phase-shift analyses of Arndt 11 are also shown in Fig.…”

supporting

confidence: 89%

Spin Dependence in Low-Energy Neutron-Proton Scattering

et al. 1986

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The analyzing power in neutron-proton scattering at 25 MeV neutron energy has been measured to an accuracy of typically ±0.002 for cm. scattering angles between 50° and 165°. Contrary to the conclusions reached from earlier precision measurements at 16.9 MeV, the contributions to partial waves with / > 3 are consistent with predictions based on one-pion exchange. The new data are well described by the Paris potential and by a recent global phase-shift analysis.

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supporting

confidence: 89%

Spin Dependence in Low-Energy Neutron-Proton Scattering

et al. 1986

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“…[67] used a neutron beam with a continuous energy distribution [68] to measure simultaneously five angular distributions of the transverse spin correlation coefficient A between 18 and 50 MeV. This set of data complements the other Karlsruhe measurements of A [69] and do /dQ [57] over the same energy range.…”

Section: Renormalizationmentioning

confidence: 98%

Phase-shift analysis ofNNscattering below 160 MeV: Indication for a strong tensor force

Henneck

1993

Phys. Rev. C

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A new phase-shift analysis of NN scattering in the energy range 15 -160 MeV is presented. The analysis is based on the carefully reviewed world pp +np data, including recent results for higher-order spin observables in n-p scattering. The latter are essential to determine the mixing parameter~& which is directly related to the isoscalar tensor force. c, displays a high trend, in agreement with recent analyses above 140 MeV, and is only reproduced by potential models with a strong tensor force. The prediction of the full Bonn potential is too low by 20% for energies above 40 MeV. All other I=O phase shifts show agreement with potential models; in particular, the notorious problem with 'P, around 50 MeV has disappeared. Around 25 MeV a ten parameter fit based purely on np data agrees with the corresponding At to the pp data and reveals no indication of anomalous charge independence breaking.PACS number(s): 21.30. +y, 13.75.Cs, 21.45. +v, 25. 10.+s

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“…The Nijmegen PWA result is taken from [107]. Data for the cross section are taken from [108] and for the analyzing power from [109,110]. The cut-offs Λ andΛ are varied as specified in eq.…”

Section: Effective Range Expansionmentioning

confidence: 99%

The two-nucleon system at next-to-next-to-next-to-leading order

2005

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We consider the two-nucleon system at next-to-next-to-next-to-leading order (N^3LO) in chiral effective field theory. The two-nucleon potential at N^3LO consists of one-, two- and three-pion exchanges and a set of contact interactions with zero, two and four derivatives. In addition, one has to take into account various isospin-breaking and relativistic corrections. We employ spectral function regularization for the multi-pion exchanges. Within this framework, it is shown that the three-pion exchange contribution is negligibly small. The low-energy constants (LECs) related to pion-nucleon vertices are taken consistently from studies of pion-nucleon scattering in chiral perturbation theory. The total of 26 four-nucleon LECs has been determined by a combined fit to some np and pp phase shifts from the Nijmegen analysis together with the nn scattering length. The description of nucleon-nucleon scattering and the deuteron observables at N^3LO is improved compared to the one at NLO and NNLO. The theoretical uncertainties in observables are estimated based on the variation of the cut-offs in the spectral function representation of the potential and in the regulator utilized in the Lippmann-Schwinger equation.Comment: 62 pp, 13 fig

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Measurements of the neutron-proton analyzing power in the energy range from 17 to 50 MeV

Cited by 31 publications

References 4 publications

Spin Dependence in Low-Energy Neutron-Proton Scattering

Spin Dependence in Low-Energy Neutron-Proton Scattering

Phase-shift analysis ofNNscattering below 160 MeV: Indication for a strong tensor force

The two-nucleon system at next-to-next-to-next-to-leading order

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