Energy dependence of the three-nucleon analyzing power puzzle

Tornow, W.; Esterline, J.; Weisel, G. J.

doi:10.1088/0954-3899/35/12/125104

Cited by 15 publications

(18 citation statements)

References 36 publications

(50 reference statements)

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“…The relative difference between theory and experiment, measured in the manner of Ref. [24], by taking account of both the maximum and the minimum of the angular distribution is 21% ± 3%. This is somewhat lower than the 25% discrepancy found in most of the data from 1.2 to 22. considerably lower than the relative difference of 36% given by n-d A y (θ ) data at 16 MeV [15] and 33% by p-d data at 20.15 MeV [24].…”

Section: Final Results and Discussionmentioning

confidence: 95%

“…At the very least, it will provide a reliable database for modelers. A recent review of available proton and neutron data confirms that the relative difference for both p-d and n-d analyzing power is about 25% between 1.2 and 16 MeV [24]. By adopting a measure of the relative difference based on both the minima and maxima in the angular distributions, it is judged in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…By adopting a measure of the relative difference based on both the minima and maxima in the angular distributions, it is judged in Ref. [24] that this measure of the discrepancy between theory and experiment stays fairly constant at 25% until about 25 MeV.…”

Section: Introductionmentioning

confidence: 99%

“…This is due to two weaknesses of the database available to Ref. [24]: First, much of the data above 16 MeV are of relatively low precision and second there are no high-precision neutron data between 16 and 30 MeV. The n-d A y (θ ) data at 16 MeV of Ref.…”

Section: Introductionmentioning

confidence: 99%

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Neutron-deuteron analyzing power data at 19.0 MeV

et al. 2010

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Measurements of neutron-deuteron (n-d) analyzing power A y (θ) at E n = 19.0 MeV are reported at 16 angles from θ c.m. = 46.7 to 152.0 • . The objective of the experiment is to better characterize the discrepancies between n-d data and the predictions of three-nucleon calculations for neutron energies above 16.0 MeV. The experiment used a shielded neutron source, which produced polarized neutrons via the 2 H( d, n) 3 He reaction, a deuterated liquid scintillator center detector (CD) and liquid-scintillator neutron side detectors. A coincidence between the CD and the side detectors isolated the elastic-scattering events. The CD pulse height spectrum associated with each side detector was sorted by using pulse-shape discrimination, time-of-flight techniques, and by removing accidental coincidences. A Monte Carlo computer simulation of the experiment accounted for effects due to finite geometry, multiple scattering, and CD edge effects. The resulting high-precision data (with absolute uncertainties ranging from 0.0022 to 0.0132) have a somewhat lower discrepancy with the predictions of three-body calculations, as compared to those found at lower energies.

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Section: Final Results and Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neutron-deuteron analyzing power data at 19.0 MeV

et al. 2010

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“…When N N models are used to describe pairwise interactions in 3N calculations, the results agree well with low-energy experimental data in most cases. However, there are some notable exceptions: the triton binding energy defect [5,6], the nucleon-deuteron analyzing power (A y ) puzzle [7], and the space-star (SST) anomaly [8]. Attempts have been made to resolve these problems by including a 3N force (3NF).…”

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confidence: 99%

Cross-section measurements of2H(n,np)nin symmetric star configurations

et al. 2012

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Cross-section measurements have been made at 16 and 19 MeV in two exit-channel configurations of neutron-deuteron breakup: the space-star and coplanar star. In this kinematically-complete measurement, the outgoing proton and one of the neutrons were detected in coincidence and their energies were determined via time-of-flight techniques. Monte-Carlo simulations based on rigorous three-nucleon Faddeev calculations using the CD-Bonn nucleon-nucleon potential were used to compare the experimental results with theory. Large discrepancies between data and theory were found in both breakup configurations measured at both energies, suggesting deficiencies in current theoretical treatment of three-nucleon forces or in present knowledge of the neutron-neutron 1 S0 force.

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Quark-Model Nucleon–Nucleon Interaction Applied to Nucleon-Deuteron Scattering

Fukukawa

Fujiwara

2012

Few-Body Syst

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We have examined the neutron-deuteron low-energy effective-range parameters, the differential cross sections and the spin polarization observables of the elastic nucleon-deuteron scattering up to the incident nucleon energy E N =65 MeV using the quark-model nucleon-nucleon interaction fss2. These observables are consistently described without introducing three nucleon forces except for the nucleon analyzing power A y (θ ) and the deuteron vector analyzing power iT 11 (θ ) in the low-energy region E N ≤ 25 MeV. The longstanding A y puzzle is slightly improved, but still remains. We have incorporated the screened Coulomb force to the proton-deuteron scattering problem by modification of the Vincent-Phatak approach for the sharp cutoff Coulomb force. The Coulomb effect on the elastic scattering observables is discussed.

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Energy dependence of the three-nucleon analyzing power puzzle

Cited by 15 publications

References 36 publications

Neutron-deuteron analyzing power data at 19.0 MeV

Neutron-deuteron analyzing power data at 19.0 MeV

Cross-section measurements of2H(n,np)nin symmetric star configurations

Quark-Model Nucleon–Nucleon Interaction Applied to Nucleon-Deuteron Scattering

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