Folding model study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi><mml:mo>−</mml:mo><mml:mi>p</mml:mi></mml:math>scattering: Systematics of elastic scattering, effective interaction, and inelastic excitation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>resonances

Morsch, H. P.; Spang, W.; Decowski, P.

doi:10.1103/physrevc.67.064001

Cited by 7 publications

(25 citation statements)

References 67 publications

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“…The details of these calculations are similar to those in Ref. [17]. As a result, the t dependence of the calculated cross section shows a diffraction pattern only for L = 0 transfer, with a slope as oberved for the resonance at 1400 MeV.…”

Section: Description Of the P-p Differential Cross Sectionssupporting

confidence: 64%

“…This can be explained by the fact that multigluon exchange (of scalar character) is the predominant part of the interaction (see, e.g., [17]). Missing mass spectra for p-p → p + x at a beam momentum of 9.9 GeV/c from Ref.…”

Section: Analysis Of P-p and π -P Spectramentioning

confidence: 99%

“…First, elastic scattering was described by a double-folding potential similar to that in Ref. [17]. By fitting the experimental data, the strength of the effective interaction and the nucleon radius were determined.…”

Section: Description Of the P-p Differential Cross Sectionsmentioning

confidence: 99%

“…[17], assuming multigluon exchange of scalar structure as the predominant part of the effective interaction. First, elastic scattering was described by a double-folding potential similar to that in Ref.…”

Section: Description Of the P-p Differential Cross Sectionsmentioning

confidence: 99%

“…Apart from the P 11 , the shapes were taken from a fit of π -N phase shift amplitudes (see Refs. [12,17]), using modified Breit-Wigner forms. A multipion background is also important, which is described by 1π and 2π threshold functions of a form similar to that used in Ref.…”

Section: Analysis Of P-p and π -P Spectramentioning

confidence: 99%

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Structure of the breathing mode of the nucleon from high-energyp−pscattering

Morsch

Żuprański

2005

Phys. Rev. C

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Spectra of p-p and π -p scattering at beam momenta between 6 and 30 GeV/c have been reanalyzed. These show strong excitation of N * resonances, the strongest one corresponding to the "scalar" P 11 excitation (breathing mode) at m 0 = 1400 ± 10 MeV with = 200 ± 20 MeV. The result of a strong scalar excitation is supported by a large longitudinal amplitude S 1/2 extracted from e-p scattering. From exclusive data on p + p → ppπ + π − , a large 2π -N decay branch for the P 11 resonance of B 2π = 75 ± 20% has been extracted.The differential cross sections were described in a double-folding approach, assuming multigluon exchange as the dominant part of the effective interaction between the constituents of projectile and target. First, the parameters of the interaction were fitted to elastic scattering; then, with this interaction, the inelastic cross sections were described in the distorted wave Born approximation (DWBA). A good description of the data requires a surface peaked transition density, quite different from that of a pure radial mode. In contrast, the electron scattering amplitude S 1/2 is quite well described by a breathing mode transition density with radial node. This large difference between charge and matter transition densities suggests that in p-p scattering the coupling to the multigluon field is much more important than the coupling to the valence quarks. A multigluon (or sea-quark) transition density is derived, which also shows breathing, indicating a rather complex multiquark structure of N and N * including additional multigluon (or q 2nq 2n ) creation out of the ground state vacuum.

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Section: Description Of the P-p Differential Cross Sectionssupporting

confidence: 64%

Section: Analysis Of P-p and π -P Spectramentioning

confidence: 99%

Section: Description Of the P-p Differential Cross Sectionsmentioning

confidence: 99%

Section: Description Of the P-p Differential Cross Sectionsmentioning

confidence: 99%

Section: Analysis Of P-p and π -P Spectramentioning

confidence: 99%

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Structure of the breathing mode of the nucleon from high-energyp−pscattering

Morsch

Żuprański

2005

Phys. Rev. C

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Energy levels of light nuclei A= 12

2017

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Two-pion production inαpscattering at 1 GeV/nucleon in the energy region of the Roper resonance excitation

Alkhazov

Augustyniak²,

Boivin

et al. 2008

Phys. Rev. C

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Semiexclusive measurements of the two-pion-production p(α, α )pππ reaction have been carried out at an energy of E α = 4.2 GeV at the Saturne-II (Saclay) accelerator with the SPES4-π installation. This reaction was investigated by simultaneous registration of the scattered α particle and the secondary proton. The obtained results show that the two-pion production in inelastic α-particle scattering on the proton at the energy of the experiment proceeds mainly through excitation in the target proton of the Roper resonance and its decay with emission of two pions in the isospin I = 0, S-wave state.

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Folding model study ofα−pscattering: Systematics of elastic scattering, effective interaction, and inelastic excitation ofN*resonances

Cited by 7 publications

References 67 publications

Structure of the breathing mode of the nucleon from high-energyp−pscattering

Structure of the breathing mode of the nucleon from high-energyp−pscattering

Energy levels of light nuclei A= 12

Two-pion production inαpscattering at 1 GeV/nucleon in the energy region of the Roper resonance excitation

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