Do phase-shift analyses and nucleon-nucleon potential models yield the wrong<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mrow><mml:mi>j</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>phase shifts at low energies?

Tornow, W.; Witała, H.; Kievsky, A.

doi:10.1103/physrevc.57.555

Cited by 45 publications

(52 citation statements)

References 27 publications

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“…To solve this puzzle, speculations about the deficiency of the N N potentials in 3 P j waves (where the spectroscopic notation 2S+1 L J has been adopted) have been suggested. Looking at N N scattering data only, this possibility does not seem to be ruled out [29,30]. However, after taking theoretical constraints into account [31], this solution was considered unlikely, and has been confirmed by recent calculations which show that this puzzle is not solved even when new N N potentials derived from effective field theory are used [8,32].…”

Section: B P-3 He Elastic Scatteringmentioning

confidence: 87%

Proton-He3elastic scattering at low energies

et al. 2006

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We present new accurate measurements of the differential cross section σ(θ) and the proton analyzing power Ay for proton-3 He elastic scattering at various energies. A supersonic gas jet target has been employed to obtain these low energy cross section measurements. The σ(θ) distributions have been measured at Ep = 0.99, 1.59, 2.24, 3.11, and 4.02 MeV. Full angular distributions of Ay have been measured at Ep = 1.60, 2.25, 3.13, and 4.05 MeV. This set of high-precision data is compared to four-body variational calculations employing realistic nucleon-nucleon (N N ) and threenucleon (3N ) interactions. For the unpolarized cross section the agreement between the theoretical calculation and data is good when a 3N potential is used. The comparison between the calculated and measured proton analyzing powers reveals discrepancies of approximately 50% at the maximum of each distribution. This is analogous to the existing "Ay Puzzle" known for the past 20 years in nucleon-deuteron elastic scattering.

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Section: B P-3 He Elastic Scatteringmentioning

confidence: 87%

Proton-He3elastic scattering at low energies

et al. 2006

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“…Some 3N and 4N scattering observables which are difficult to be reproduced with the existing models indicate a strong nn P-waves contribution. It has been suggested that these discrepancies in 3N and 4N scattering observables can be significantly improved by modifying nn P -waves within 20% [15,16,17]. We have explored such a possibility and traced in fig.…”

Section: Resultsmentioning

confidence: 99%

Is a physically observable tetraneutron resonance compatible with realistic nuclear interactions?

Lazauskas

Carbonell

2005

Phys. Rev. C

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The possible existence of four-neutron resonances close to the physical energy region is explored. Faddeev-Yakubovsky equations have been solved in configuration space using realistic nucleonnucleon interaction models. Complex Scaling and Analytical Continuation in the Coupling constant methods were used to follow the resonance pole trajectories, which emerge out of artificially bound tetraneutron states. The final pole positions for four-neutron states lie in the third energy quadrant with negative real energy parts and should thus not be physically observable.

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“…One proposed explanation was that the 3 P J phase shifts are incorrect, leading to an improper determination of the NN force components in these partial waves [19]. For a short time, chiral perturbation theory seemed to confirm this; [16] calculations in the next-to-leading order (NLO) suggested that the NN chiral force will solve the 3NAPP via modified 3 P J phase shifts [20].…”

Section: Introductionmentioning

confidence: 96%

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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Do phase-shift analyses and nucleon-nucleon potential models yield the wrong3Pjphase shifts at low energies?

Cited by 45 publications

References 27 publications

Proton-He3elastic scattering at low energies

Proton-He3elastic scattering at low energies

Is a physically observable tetraneutron resonance compatible with realistic nuclear interactions?

Neutron-deuteron analyzing power data at 19.0 MeV

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