Neutron-proton analyzing power data between 7.6 and 18.5 MeV

Weisel, G. J.; Tornow, W.; Howell, C. R.; Felsher, P. D.; Al-Ohali, M.A.; Chen, Z. P.; Walter, R. L.; Lambert, J.M.; Treado, P.A.; Šlaus, I.

doi:10.1103/physrevc.46.1599

Cited by 14 publications

(21 citation statements)

References 32 publications

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“…Results for n-p A y (θ ) after the PDE corrections are displayed in Figs [1]. The crosses use the original PDE corrections, while the circles use the PDE corrections of the present paper.…”

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confidence: 96%

“…All four of these data sets show small systematic improvements in their overall smoothness, which offer further confirmation that our new 12 C library is an improvement over those used in Refs. [1,4]. The uncertainty of the PDE correction has three potential sources.…”

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confidence: 99%

“…To estimate this uncertainty, we calculated the PDE with three different CDPH gates: 10%, 20%, and 30% of the CDPH peak height in the simulations for Ref. [1], and 20%, 30%, and 40% for Ref. [4].…”

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confidence: 99%

“…In Ref. [1], the nominal CDPH gate was set at 20% of the peak height and, in Ref. [4], the nominal gate was set at 30%.…”

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confidence: 99%

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Corrections for the polarization-dependent efficiency and new neutron-proton analyzing power data at 7.6 MeV

2010

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We present new corrections for the polarization-dependent efficiency (PDE), which introduces a false asymmetry into measurements of n-p analyzing power A y (θ) caused by double scattering in the neutron side detectors. To accomplish this, we created a new database of 12 C( n,n) A y (θ) by using a combination of fits to data, phase-shift analysis, and R-matrix analysis. Our recorrection for PDE of previously reported n-p A y (θ) data at 7.6 and 12.0 MeV and new data at 7.6 MeV indicate that we have achieved a superior representation of 12 C( n,n). Our results continue to suggest a possible charge dependence of the pion-nucleon coupling constant.The motivation for collecting high-precision neutronproton (n-p) analyzing power A y (θ ) data is to test the accuracy of nucleon-nucleon (NN) phase-shift analysis (PSA) predictions for this observable. At low energy, n-p A y (θ ) depends greatly on the 3 P 0 , 3 P 1 , and 3 P 2 phase shifts and good-quality data can be useful in constraining these parameters. Nearly two decades ago, Triangle Universities Nuclear Laboratory (TUNL) collected n-p A y (θ ) data at E n = 7.6, 12.0, 14.0, 16.0, and 18.0 MeV [1]. In terms of uncertainties, these data were of similar quality as earlier measurements by Holslin and co-workers [2] at E n = 10.03 MeV. None of these data were of adequate precision to show clear discrepancies with the Nijmegen PSA predictions [3]. Reference [1] also found that data from 14 to 20 MeV probably would not be able to demonstrate discrepancies with NN predictions, since there is less difference between the various theoretical models in this energy range.

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confidence: 96%

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Corrections for the polarization-dependent efficiency and new neutron-proton analyzing power data at 7.6 MeV

2010

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“…A single sample is shown in figure 9, the np A y data at 12 MeV from TUNL [74]. Predictions are shown for Model A (solid line), D (dash-dot), and E (dash-triple-dot).…”

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confidence: 99%

9. The nucleon-nucleon interaction

Brown¹,

Jackson²

Models of Hadron Structure Based on Quantum Chromodynamics

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Abstract. We review the major progress of the past decade concerning our understanding of the nucleon-nucleon interaction. The focus is on the low-energy region (below pion production threshold), but a brief outlook towards higher energies is also given. The items discussed include charge-dependence, the precise value of the πN N coupling constant, phase shift analysis and high-precision NN data and potentials. We also address the issue of a proper theory of nuclear forces. Finally, we summarize the essential open questions that future research should be devoted to.

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