Photoproduction of Charged pi Mesons from Hydrogen and Deuterium in the Energy Range Between 250-MeV and 790-MeV

Fujii, T. ; Kondo, T. ; Takasaki, F. ; et al.
Nucl.Phys.B 120 (1977) 395-422, 1977.
Inspire Record 108476 DOI 10.17182/hepdata.8405

The differential cross sections for γ p→ π + n from hydrogen and the π − π + ratios from deuterium were measured at nine c.m. angles between 30° and 150° for laboratory photon energies between 260 and 800 MeV. A magnetic spectrometer with three layers of scintillation hodoscope was used to detect charged π mesons. The cross section for γ n→ π − p was obtained as a product of d σ d Ω (γ p →π + n ) and the π − π + ratio. The overall features in the cross sections of the two reactions, γ p→ π + n and γ n→ π − p, and in the ratios, π − π + , agree with predictions by Moorhouse, Oberlack and Rosenfeld, and Metcalf and Walker. An investigation of the possible existence of an isotensor current was made and a negative result was found. In detailed balance comparison with the new results on the inverse reaction π − p→ γ n, no apparent violation of time-reversal invariance was observed.

1 data table match query

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Photoproduction of pi+ Mesons from Hydrogen in the Region 350-900 Mev

Heinberg, M. ; McClelland, W.M. ; Turkot, F. ; et al.
Phys.Rev. 110 (1958) 1211-1212, 1958.
Inspire Record 46812 DOI 10.17182/hepdata.26860

None

1 data table match query

No description provided.


Measurement of the asymmetry for pi+ photoproduction from polarized protons between 300 and 900 mev

Arai, S. ; Fukui, S. ; Horikawa, N. ; et al.
Nucl.Phys.B 48 (1972) 397-414, 1972.
Inspire Record 84444 DOI 10.17182/hepdata.32778

The asymmetry of the cross section for π + photoproduction from a polarized butanol target has been measured at a c.m. angle 90° and photon energies between 300 and 900 MeV by a single-arm spectrometer detecting positive pions. Our results indicate that the asymmetry has clear positive peaks at photon energies 400 and 700 MeV with a deep valley at about 600 MeV. The general feature of the results is well reproduced by the phenomenological analyses made by Walker and ourselves; however, the best fit to the polarized target asymmetry data seems to give a somewhat different set of parameters from that given by Walker.

1 data table match query

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Photoproduction of positive pions at 180 degrees at photon energies from 0.4 to 1.4 gev

Dannhausen, H.W. ; Fischer, G. ; Fischer, H.M. ; et al.
Nucl.Phys.B 61 (1973) 285-295, 1973.
Inspire Record 83899 DOI 10.17182/hepdata.32537

Pions from the reaction γ + p → π + + n were analysed in the backward direction by a magnetic spectrometer. The photon energy region of 0.394 GeV to 1.397 GeV was covered by 19 different momentum settings. Data reduction resulted in 74 measured differential cross sections with statistical uncertainties typically from 4% to 8%. The systematic uncertainty was estimated to be ±5%. The data are compared to other recent experiments and predictions of phenomenological analyses.

1 data table match query

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Positive-Pion Production Asymmetry with Polarized Bremsstrahlung Near Second Resonance

Liu, F.F. ; Vitale, S. ;
Phys.Rev. 144 (1966) 1093-1100, 1966.
Inspire Record 50917 DOI 10.17182/hepdata.26643

The azimuthal asymmetry Σ=(σ⊥−σII)(σ⊥+σII) in π+ photoproduction by linearly polarized bremsstrahlung was measured at photon energies from 475 to 750 MeV at 90° and 135° in the center-of-mass system. The experimental results show that even in this energy region, π+ are produced predominantly in the plane of the magnetic vector.

1 data table match query

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pi+ Photoproduction from Hydrogen at Lab Angles from 34-degrees to 155-degrees and Lab Photon Energies from 500 to 1350 MeV

Thiessen, Henry A. ;
Phys.Rev. 155 (1967) 1488-1496, 1967.
Inspire Record 52277 DOI 10.17182/hepdata.26588

The differential cross section for the reaction γ+p→π++n was measured using the Caltech 1.5-GeV electron synchrotron. The positive pions were detected and momentum analyzed in a multichannel magnetic spectrometer and the data were recorded in the memory of a pulse-height analyzer. The energy resolution was improved over previous experiments and an attempt was made to minimize systematic errors. The data are presented in the form of energy distributions at 12 lab angles from 34° to 155°, and the range of lab proton energies extended from 500 to 1350 MeV. Data were not taken at all energies for each angle, since the maximum useful momentum of the spectrometer, 600 MeVc, restricted the maximum energy for lab angles less than or equal to 74°.

1 data table match query

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Asymmetry Measurements for $\pi^0$ and $\pi^+$ Photoproduction by Linearly Polarized $\gamma$ Rays in the Energy Range 400-{MeV} - 900-{MeV}

Zdarko, R.W. ; Dally, E.B. ;
Nuovo Cim.A 10 (1972) 10, 1972.
Inspire Record 74908 DOI 10.17182/hepdata.37786

The asymmetry ratioA = (σ⊥ -σ∥)/(σ⊥ +σ∥) has been measured by means of linearly polarized γ-rays for π0 and π+ photoproduction. For the reaction γ + p → n + π+, measurements were taken for θc.m. = 135° at γ-ray energies ranging from 390 to 909 MeV. For the reaction γ + p → p + π0, measurements were taken for θc.m. = 60° and 90° at γ-ray energies ranging from 426 to 918 Mev.

2 data tables match query

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No description provided.


BACKWARD PHOTOPRODUCTION OF POSITIVE PIONS ON HYDROGEN

Fischer, G. ; Fischer, H. ; Leneke, M. ; et al.
PI-1-100, 1970.
Inspire Record 1105110 DOI 10.17182/hepdata.37283

None

1 data table match query

Photoproduction of Single Positive Pions from Hydrogen in the 600- to 1000-Mev Region

Dixon, F.P. ; Walker, R.L. ;
Phys.Rev.Lett. 1 (1958) 458-460, 1958.
Inspire Record 48016 DOI 10.17182/hepdata.37230

None

1 data table match query

No description provided.


Single-positive-pion photoproduction on hydrogen in the energy range (500÷800) MeV

Beneventano, M. ; Paoluzi, L. ; Sebastiani, F. ; et al.
Nuovo Cim. 54 (1968) 468-474, 1968.
Inspire Record 1185328 DOI 10.17182/hepdata.37565

Cross-sections for the photoproduction of positive pions in hydrogen have been measured at the 1.1 GeV Frascati electron synchrotron for photon energiesE γ between 500 and 800 MeV and for π+ c.m. angles of θ=30o, 90o. The cross-sections exhibit a smooth behavior as a function of energy forE γ=(500÷600) MeV. No immediate evidence is found of a contribution of theP 11 resonance.

1 data table match query

No description provided.