Photoproduction of neutral pions off neutrons in the energy region between 500 MeV and 900 MeV

Hemmi, Y.; Inagaki, Takefumi; Kikuchi, R.; Maki, A.; Miyake, K.; Nakamura, T.; Sasaki, Akihiko; Tamura, N.; Yasumi, S.; Okuno, H.

doi:10.1016/0550-3213(73)90384-2

Cited by 16 publications

(8 citation statements)

References 41 publications

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“…for quasifree photoproduction on neutrons and protons can clarify the situation. The old data from [42,43], pointing to R = 1 in the second resonance region, seem to be in disagreement with the results of [33]. Future theoretical improvements should be devoted to the inclusion of two-body effects in the photoproduction amplitude, e.g.…”

Section: Discussionmentioning

confidence: 86%

Incoherent pion photoproduction on the deuteron with polarization observables. II. Influence of final state rescattering

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Arenhövel

2005

Phys. Rev. C

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Incoherent pion photoproduction on the deuteron is studied for photon energies from threshold up to 1 GeV with special emphasis on polarization observables. The elementary γN → πN amplitude is taken from the MAID model. The influence of final state interactions on total and semi-exclusive cross sections d( γ, π)N N is investigated by including complete rescattering in the final N N -and πN -subsystems. For charged pion-production the influence of N N -rescattering is moderate whereas πN -rescattering is almost negligible. Much stronger influences of N N -rescattering are seen in neutral pion production, which is due to the elimination of a significant spurious coherent contribution in the impulse approximation. Sizeable effects are also found in some of the beam, target and beam-target asymmetries of the differential cross section.

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Section: Discussionmentioning

confidence: 86%

Incoherent pion photoproduction on the deuteron with polarization observables. II. Influence of final state rescattering

Fix

Arenhövel

2005

Phys. Rev. C

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“…Differential cross sections for photoproduction of neutral pions off neutrons γd → nπ 0 (p) are obtained using a deuteron target [69,70,71,72]. The beam asymmetry Σ for this reaction is available from [73].…”

Section: Data Basementioning

confidence: 99%

“…7. Differential cross section for γn → π 0 n. Data: black open circles are from [69], red open squares are from [70], green filled circles are from [71], blue filled squares are from [72].…”

Section: Fits To the Datamentioning

confidence: 99%

Helicity amplitudes for photoexcitation of nucleon resonances off neutrons

et al. 2013

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“…Thus, considering that the data from the A2 Collaboration might bear large uncertainties in the second resonance region, with a small positive helicity amplitude, A n 1/2 ≃ 20 × 10 −3 GeV −1/2 for N(1650)S 11 , we predict the differential and total cross sections around the second resonance region ( see Fig. 17 [3] (open circles), [103] (solid circles), [104] (solid squares), and [105] (solid triangles). The first and second number in each figure correspond to the photon energy E γ (MeV) and the πN center-of-mass energy W (MeV), respectively.…”

Section: Helicity Amplitudesmentioning

confidence: 99%

Neutral pion photoproduction on the nucleon in a chiral quark model

2015

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A chiral quark-model approach is adopted to study the γp → π 0 p and γn → π 0 n reactions. Good descriptions of the total and differential cross sections and single-polarization observables are obtained from the pion production threshold up to the second resonance region. It is found that (i) the n = 0 shell resonance ∆(1232)P 33 , the n = 1 shell resonances N(1535)S 11 and N(1520)D 13 , and the n = 2 shell resonance N(1720)P 13 play crucial roles in these two processes. They are responsible for the first, second and third bump structures in the cross sections, respectively. (ii) Furthermore, obvious evidences of N(1650)S 11 and ∆(1620)S 31 are also found in the reactions. They notably affect the cross sections and the polarization observables from the second resonance region to the third resonance region. (iii) The u-channel background plays a crucial role in the reactions. It has strong interferences with the s-channel resonances. (iv) The t-channel background seems to be needed in the reactions. Including the t-channel vector-meson exchange contribution, the descriptions in the energy region E γ = 600 ∼ 900 MeV are improved significantly. The helicity amplitudes of the main resonances, ∆(1232)P 33 , N(1535)S 11 , N(1520)D 13 , N(1720)P 13 , N(1650)S 11 , and ∆(1620)S 31 , are extracted and compared with the results from other groups.

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Photoproduction of neutral pions off neutrons in the energy region between 500 MeV and 900 MeV

Cited by 16 publications

References 41 publications

Incoherent pion photoproduction on the deuteron with polarization observables. II. Influence of final state rescattering

Incoherent pion photoproduction on the deuteron with polarization observables. II. Influence of final state rescattering

Helicity amplitudes for photoexcitation of nucleon resonances off neutrons

Neutral pion photoproduction on the nucleon in a chiral quark model

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