Effective range parameters in nucleon-nucleon scattering

Mathelitsch, Leopold; VerWest, B.J.

doi:10.1103/physrevc.29.739

Cited by 35 publications

(37 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There exist several analytic continuation formulas which relate c. & near threshold with bound-state properties of the deuteron or with finite-range parameters (for a review, see Ref. [21], and references therein). The most realistic of these is Wang s formula [22], which involves one-pion exchange, the S& scattering length, and effective range theory.…”

Section: Theoretical Predictions For Amentioning

confidence: 99%

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

Henneck

1993

Phys. Rev. C

View full text Add to dashboard Cite

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

show abstract

Section: Theoretical Predictions For Amentioning

confidence: 99%

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

Henneck

1993

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…We neglect the small non-Coulomb electromagnetic contributions due to magnetic interactions, vacuum polarization, and the finite proton size 27,37,38 . This approximation changes the scattering parameters at the level of a few percent 27,37,38 .…”

Section: 33mentioning

confidence: 99%

Measurement of interaction between antiprotons

Adamczyk

Adkins

Agakishiev

et al. 2015

Nature

View full text Add to dashboard Cite

One of the primary goals of nuclear physics is to understand the force between nucleons, which is a necessary step for understanding the structure of nuclei and how nuclei interact with each other. Rutherford discovered the atomic nucleus in 1911, and the large body of knowledge about the nuclear force since acquired was derived from studies made on nucleons or nuclei. Although antinuclei up to antihelium-4 have been discovered 1 and their masses measured, we have no direct knowledge of the nuclear force between antinucleons. Here, we study antiproton pair correlations among data taken by the STAR experiment 2 at the Relativistic Heavy Ion Collider (RHIC) 3 and show that the force between two antiprotons is attractive. In addition, we report two key parameters that characterize the corresponding strong interaction: namely, the scattering length (f 0 ) and effective range (d 0 ). As direct information on the interaction between two antiprotons, one of the simplest systems of antinucleons, our result provides a fundamental ingredient for understanding the structure of more complex antinuclei and their properties.Although the theory of Quantum Chromodynamics (QCD) provides us with an understanding of the foundation of the nuclear force, this binding interaction in nuclei operates at low energy, where the force is strong and difficult to calculate directly from the theory. For that reason, a common parameterization of the effective interaction between nucleons is based on experimental measurements, and the corresponding parameterization for antinucleons remains undetermined. Ultra-relativistic nuclear collisions produce an energy density similar to that of the Universe microseconds after the Big Bang, and the high energy density creates a favourable environment for antimatter production. The abundantly produced antiprotons provide the opportunity to measure, for the first time, the parameters f 0 and d 0 of the strong nuclear force between antinucleons rather than nucleons.The technique used to probe the antiproton-antiproton interaction involves momentum correlations, and it resembles the space-time correlation technique used in Hanbury-Brown and Twiss (HBT) intensity interferometry. Since its invention for use in astronomy by Robert Hanbury-

show abstract

“…The extracted radii for protons (R pp ) and that for antiprotons R p−p , are 2.75 ± 0.01(stat) ± 0.04(sys) fm and 2.80 ± 0.02(stat) ± 0.03(sys) fm, respectively. Table I presents the first measurement of f 0 and d 0 of the antiproton-antiproton interaction, together with prior measurements for nucleon-nucleon interactions [24,25]. Within errors, the f 0 and d 0 for the antiproton-antiproton interaction are consistent with their antiparticle counterpartsthe ones for the proton-proton interaction.…”

Section: Measurement Of Interaction Between Antiprotonsmentioning

confidence: 63%

“…The result provides a quantitative verification of matterantimatter symmetry in the important and ubiquitous context of the forces responsible for the binding of (anti)nuclei. To take advantage of the existing knowledge on the proton-proton interaction, which is relatively well understood, when fitting the proton-proton correlation, f 0 and d 0 for protons are fixed at values measured from proton-proton elastic-scattering experiments, which are 7.82 fm and 2.78 fm, respectively [24]. When fitting the antiproton-antiproton correlation, f 0 and d 0 are treated as free parameters.…”

Section: Measurement Of Interaction Between Antiprotonsmentioning

confidence: 99%

Antimatter Production and Interaction in Relativistic Heavy Ion Collisions

Ma¹

2017

Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016)

View full text Add to dashboard Cite

Observation of antimatter nuclei and measurement on antiproton-antiproton interaction at Relativistic Heavy-Ion Collider (RHIC) are briefly reviewed in this report. First, relativistic heavy ion collision and the history of earlier antimatter discovery are introduced. Second, the result for the discovery of antihypertriton is presented. Third, the observation of antihelium-4 is introduced. Forth, the production mechanism of antimatter nuclei in heavy ion collisions is discussed. Finally, the measurement of interaction between antiprotons is reported.

show abstract

Effective range parameters in nucleon-nucleon scattering

Cited by 35 publications

References 51 publications

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

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

Measurement of interaction between antiprotons

Antimatter Production and Interaction in Relativistic Heavy Ion Collisions

Contact Info

Product

Resources

About