Measurement of the tensor analyzing power T20 for the reaction γd → pnπ0

This paper presents new results for the [Formula: see text]-component of the tensor analyzing power of the reaction [Formula: see text] in the photon energy range of [Formula: see text]. The experimental statistics accumulated in 2013 at the VEPP-3 accelerator-storage complex is used. The reaction events are identified by the coincidence registration of the proton and two [Formula: see text]-quanta from the decay of the neutral pion. To determine the [Formula: see text]-component, the asymmetry of the yields with respect to the change of sign of the tensor polarization of the deuterium target is measured. The experimental results are compared with the theoretical calculations in which the MAID 2007 model is used as the elementary pion–nucleon photoproduction amplitude and contributions from the pion–nucleon and nucleon–nucleon rescattering are taken into account.

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Some differential cross-section for neutral pion photoproduction in the photon energy range 350–850 MeV

Physics Letters B ◽

10.1016/0370-2693(74)90507-3 ◽

1974 ◽

Vol 49 (2) ◽

pp. 194-196 ◽

Cited By ~ 5

Author(s):

P. Dougan ◽

T. Kivikas ◽

K. Lugnér ◽

V. Ramsay ◽

W. Stiefler

Keyword(s):

Differential Cross Section ◽

Energy Range ◽

Cross Section ◽

Photon Energy ◽

Differential Cross ◽

Neutral Pion ◽

Pion Photoproduction ◽

Photon Energy Range

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Measurements of the tensor analyzing power T20 of the reaction γd → dπ0

International Journal of Modern Physics E ◽

10.1142/s0218301320500111 ◽

2020 ◽

Vol 29 (03) ◽

pp. 2050011

Author(s):

V. V. Gauzshtein ◽

M. I. Levchuk ◽

A. Yu. Loginov ◽

D. M. Nikolenko ◽

I. A. Rachek ◽

...

Keyword(s):

Nuclear Physics ◽

Neutral Pion ◽

Center Of Mass ◽

Polar Angle ◽

Theoretical Models ◽

Pion Photoproduction ◽

Budker Institute ◽

Deuterium Target ◽

Power Component ◽

Analyzing Power

The paper presents the results of measurements of the tensor analyzing power component [Formula: see text] for the coherent neutral pion photoproduction on the deuteron. The measurements were performed in the Budker Institute of Nuclear Physics using the internal tensor polarized deuterium target at VEPP-3 storage ring. The measurements covered the region of the photon energy 240 — 420[Formula: see text]MeV and the region of the center-of-mass pion polar angle 100–140[Formula: see text]. The results of measurements were compared with the calculations performed within frameworks of several theoretical models.

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Tensor analyzing power component T20 of the γd→→π0d process in the photon energy range from 200 to 400 MeV

Results in Physics ◽

10.1016/j.rinp.2020.103238 ◽

2020 ◽

Vol 18 ◽

pp. 103238

Author(s):

H. Al-Ghamdi ◽

E.S. Almogait ◽

E.M. Darwish ◽

S. Abdel-Khalek

Keyword(s):

Energy Range ◽

Photon Energy ◽

Photon Energy Range ◽

Power Component ◽

Analyzing Power

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The polarised target asymmetry for neutral pion photoproduction from protons in the photon energy range 0.7 – 1.45 GeV

Nuclear Physics B ◽

10.1016/0550-3213(77)90326-1 ◽

1977 ◽

Vol 121 (1) ◽

pp. 45-57 ◽

Cited By ~ 22

Author(s):

P.S.L. Booth ◽

L.J. Carroll ◽

G.R. Court ◽

P.R. Daniel ◽

R. Gamet ◽

...

Keyword(s):

Energy Range ◽

Photon Energy ◽

Neutral Pion ◽

Pion Photoproduction ◽

Photon Energy Range ◽

Target Asymmetry

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A resonance model for pion production in nucleon-nucleon collisions at fairly low energies

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1958.0057 ◽

1958 ◽

Vol 244 (1239) ◽

pp. 491-523 ◽

Cited By ~ 104

Keyword(s):

Angular Momentum ◽

Cross Sections ◽

Pion Production ◽

Neutral Pion ◽

Mass Difference ◽

Nucleon Nucleon ◽

Resonance Model ◽

Low Energies ◽

Pion Nucleon ◽

The Difference

Cross-sections for pion production in nucleon-nucleon collisions are calculated on the assumption that the production takes place into a few angular momentum states only, and that the matrix element for each particular transition is constant except for factors due to the final-state pion-nucleon and nucleon-nucleon interactions. The outgoing pion is assumed to be in a resonant (3/2, 3/2) state with one of the nucleons. The angular momentum states introduced are compared with those of Rosenfeld (1954) and Gell-Mann & Watson (1954). It is found that a three-parameter theory can give a good account of most of the experiments on pion production, both total and differential, up to 660 MeV, except near threshold when non-resonance production is important and further parameters are necessary. Energy distribution and angular correlation experiments bring out the importance of the pion-nucleon resonance. The cross-section for neutral pion production is predicted fairly accurately in terms of that for positive pion production from threshold to 660 MeV; at 660 MeV, the calculated positive:neutral ratio is 3⋅9. The difference between this value and that of Peaslee (1954) is partly due to the mass difference between the positive and neutral pion and partly to the inclusion of interference effects between the outgoing nucleons.

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Measurement of the tensor analyzing power for the γd → ppπ− reaction in the low energy range of protons

International Journal of Modern Physics E ◽

10.1142/s0218301318500829 ◽

2018 ◽

Vol 27 (10) ◽

pp. 1850082

Author(s):

V. V. Gauzshtein ◽

M. I. Levchuk ◽

A. Yu. Loginov ◽

S. E. Lukonin ◽

D. M. Nikolenko ◽

...

Keyword(s):

Energy Range ◽

Photon Energy ◽

Storage Ring ◽

Proton Energy ◽

Low Energy ◽

Meson Photoproduction ◽

Electron Storage ◽

Gas Target ◽

Deuterium Gas ◽

Analyzing Power

All three components of the tensor analyzing power for the reaction of [Formula: see text]-meson photoproduction on a deuteron have been measured in photon energy range of 280–500[Formula: see text]MeV and proton energy range of 15–70[Formula: see text]MeV. The experiment has been conducted on an internal tensor-polarized deuterium gas target of the VEPP-3 electron storage ring using the method of detecting two final protons in coincidence. Measured components of the tensor analyzing power have been compared with calculations results obtained within the framework of diagrammatic approach.

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