PHOTOPRODUCTION OF NEUTRAL PIONS IN HYDROGEN AND DEUTERIUM.

PHOTOPRODUCTION OF NEUTRAL PIONS IN HYDROGEN AND DEUTERIUM. PDF Author:
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Languages : en
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PHOTOPRODUCTION OF NEUTRAL PIONS IN HYDROGEN AND DEUTERIUM.

PHOTOPRODUCTION OF NEUTRAL PIONS IN HYDROGEN AND DEUTERIUM. PDF Author:
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Category :
Languages : en
Pages :

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Two Topics in Pion Physics

Two Topics in Pion Physics PDF Author: Robert Henry Traxler
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ISBN:
Category : Pion production
Languages : en
Pages : 92

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Threshold Neutral Pion Photoproduction in Hydrodgen [hydrogen] and Deuterium

Threshold Neutral Pion Photoproduction in Hydrodgen [hydrogen] and Deuterium PDF Author:
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Languages : en
Pages : 14

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I. Photoproduction of Neutral Pions from Complex Nuclei and the Pair-correlation Function. II. The Relative Rate of Absorption of Negative Pions in Hydrogen and Deuterium

I. Photoproduction of Neutral Pions from Complex Nuclei and the Pair-correlation Function. II. The Relative Rate of Absorption of Negative Pions in Hydrogen and Deuterium PDF Author: Robert Henry Traxler
Publisher:
ISBN:
Category :
Languages : en
Pages : 79

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Two Topics in Pion Physics

Two Topics in Pion Physics PDF Author: Robert Henry Traxler
Publisher:
ISBN:
Category :
Languages : en
Pages : 79

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Two Topics in Pion Physics. I. Photoproduction of Neutral Pions from Complex Nuclei and the Pair-Correlation Function. II. the Relative Rate of Absorption of Negative Pions in Hydrogen and Deuterium (thesis).

Two Topics in Pion Physics. I. Photoproduction of Neutral Pions from Complex Nuclei and the Pair-Correlation Function. II. the Relative Rate of Absorption of Negative Pions in Hydrogen and Deuterium (thesis). PDF Author:
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Languages : en
Pages :

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A simple theory of the photoproduction of pi /sup 0/ mesons from complex nuclei based on the impulse and closure approximation is studied. The theory is compared with an experiment of Goodwin, Anderson, and Kenney that shows the dependence of the number of decay gammas from pi /sup 0/ mesons photo- produced from various nuclei as a function of the atomic number at 45, 90, and 135 degrees for incident photon energies from threshold to 350 Mev. The dependence measured near threshold and at 45 degrees does not agree with the simple theory nor is it consistent with partial elastic production. By a method of Placzek and Wick the corrections to the simple theory are estimated, and found to be large near threshold. These corrections may explain the discrepancy between the theory and the experimental results. No information about the nuclear-pair correlation function is obtained. The impulse approximation is used to calculate the relative ratio of the radiative absorption rate of pi /sup -/ mesons absorbed in hydrogen and deuterium from an atomic s state. The calculated value of the ratio T = R(pi /sup -/ + d yields 2n + gamma)/R(pi /sup -/ + p yields n + gamma) is 0.83 plus or minus 0.08. The experimental value is 0.41 plus or minus 0.06. The closure approximation is used to evaluate T. By a method due to Placzek the error due to the closure approximation is shown to be small. (auth).

Photoproduction of Neutral Pions from Hydrogen Near Threshold

Photoproduction of Neutral Pions from Hydrogen Near Threshold PDF Author: John Joseph Russell
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Category :
Languages : en
Pages : 82

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The Photoproduction of Neutral Pions from Hydrogen

The Photoproduction of Neutral Pions from Hydrogen PDF Author: David Charles Oakley
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Category : Electronic dissertations
Languages : en
Pages : 122

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Exclusive Photoproduction of Charged Pions in Hydrogen and Deuterium from 1 to 6 GeV.

Exclusive Photoproduction of Charged Pions in Hydrogen and Deuterium from 1 to 6 GeV. PDF Author:
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Category :
Languages : en
Pages : 195

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The study of the transition region in the description of exclusive processes and hadron structure, from the nucleon-meson degrees of freedom in meson-exchange models at low energy to the quark-gluon degrees of freedom in pQCD at high energy, is essential for us to understand the strong interaction. The differential cross section measurements for exclusive reactions at fixed center-of-mass angles enable us to investigate the constituent counting rule, which explicitly connects the quark-gluon degrees of freedom to the energy dependence of differential cross sections. JLab Experiment E94-104 was carried out in Hall A with two high resolution spectrometers. It included the coincidence cross section measurement for the ?n --> ?-[p] process with a deuterium target and the singles measurement for the ?p --> ?+[n] process with a hydrogen target. The untagged real photons were generated by the electron beam impinging on a copper radiator. The photon energies ranged from 1.1 to 5.5 GeV, corresponding to the center-of-mass energies from 1.7 to 3.4 GeV. The pion center-of-mass angles were fixed at 50 deg, 70 deg, 90 deg, and also 100 deg, 110 deg at a few energies. The JLab E94-104 data presented in this thesis contain four interesting features. The data exhibit a global scaling behavior for both ?- and ?+ photoproduction at high energies and high transverse momenta, consistent with the constituent counting rule and the existing ?+ photoproduction data. This implies that the quark-gluon degrees of freedom start to play a role at this energy scale. The data suggests possible substructure of the scaling behavior, which might be oscillations around the scaling value. There are several possible mechanisms that can cause oscillations, for example the one associated with the generalized constituent counting rule involving quark orbital angular momentum. The data show an enhancement in the scaled cross section at center-of-mass energy near 2.2 GeV, where baryon resonances are not as well known as those at low energies. The differential cross section ratios for exclusive ?n --> ?-[p] to ?p --> ?+[n] process at ?cm = 90 deg start to show consistency with the prediction based on one-hard-gluon-exchange diagrams at high energies.

Photoproduction of Neutral Pions in Hydrogen from 500 to 950 Mev

Photoproduction of Neutral Pions in Hydrogen from 500 to 950 Mev PDF Author: James I. Vette
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Category : Electronic dissertations
Languages : en
Pages : 232

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