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Author: Joseph Shapiro
Publisher:
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Category :
Languages : en
Pages :
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Author: Joseph Shapiro
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
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Category :
Languages : en
Pages :
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We report preliminary results of photodisintegration of deuteron and 3He measured with CLAS at Jefferson Lab. We have extracted the beam-spin asymmetry for the {vector [gamma]}d → pn reaction at photon energies from 1.1 GeV to 2.3 GeV and proton center-of-mass (c.m.) angles between 35° and 135° . Our data show interesting evolution of the angular dependence of the observable as the photon energy increases. The energy dependence of the beam-spin asymmetry at 90 shows a change of slope at photon energy of 1.6 GeV. A comparison of our data with model calculations suggests that a fully non-perturbative treatment of the underlying dynamics may be able to describe the data better than a model based on hard scattering. We have observed onset of dimensional scaling in the cross section of two-body photodisintegration of 3He at remarkably low energy and momentum transfer, which suggests that partonic degrees of freedom may be relevant for the description of nuclei at energies lower than previously considered.
Author: Viktor Semenovich Vasilevskiĭ
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Category : Mathematical physics
Languages : en
Pages : 13
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Author: Alan Virgil Larson
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Category : Photonuclear reactions
Languages : en
Pages : 302
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Targets of He, Li, C, and Al were irradiated by bremsstrahlung of 257 Mev maximum photon energy. Photodisintegrations which involve two fast protons were observed. Energy and angular distributions of the coincident protons, one of which was always observed at a laboratory angle corresponding roughly to 90 degrees in the center of mass of the two protons, were measured. The primary absorption of the photon occurs on neutron-proton pairs. The proton-proton pairs arise from subsequent internal scattering of the primary photoneutron from other protons in the nucleus. No evidence is seen that mesons are reabsorbed on nucleon pairs which do not include the parent nucleon. An upper limit is established for this process. This experiment supports the photomeson production models which do not depend upon the true absorption of mesons as they pass through nuclear matter. (Author).
Author: Douglas R. O. Morrison
Publisher:
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Category :
Languages : en
Pages :
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Author: Evans Hayward
Publisher:
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Category : Photonuclear reactions
Languages : en
Pages : 52
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Author: Raymond D. Cooper
Publisher:
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Category : Nuclear physics
Languages : en
Pages : 28
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Author: D. V. Skobel tsyn
Publisher: Springer
ISBN: 148992714X
Category : Science
Languages : en
Pages : 196
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Author: Joseph S. Levinger
Publisher:
ISBN:
Category : Photonuclear reactions
Languages : en
Pages : 162
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Author: David C. Menzies
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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