Neutron-proton Bremsstrahlung Inclusive Photon Measurements from 100 to 280 MeV PDF Download
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Author: Douglas Ray Mayo
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Category :
Languages : en
Pages : 494
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Author: Douglas Ray Mayo
Publisher:
ISBN:
Category :
Languages : en
Pages : 494
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Author: J.A. Edgington
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Category :
Languages : en
Pages : 26
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Author: John Chancellor Young
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Category :
Languages : en
Pages : 290
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Category :
Languages : en
Pages : 8
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It is well known that charged particles emit bremsstrahlung radiation when they are accelerated. Classical electron bremsstrahlung occurs when a photon is emitted by an electron accelerated in the field of a nucleus. The bremsstrahlung process also occurs in the scattering of nucleons, for which it is the lowest energy inelastic process that can occur. Like electron bremsstrahlung, nucleon-nucleon bremsstrahlung also requires the exchange of a virtual particle to conserve energy and momentum. In electron bremsstrahlung a virtual photon is exchanged but with two nucleons a meson can be exchanged. Unlike electron bremsstrahlung, in nucleon-nucleon bremsstrahlung the photon can originate from the exchanged meson. This exchange contribution has been shown in calculations to be a significant fraction of bremsstrahlung events. Thus bremsstrahlung serves as a probe of exchange currents in the nucleon-nucleon interaction. Because of a lack of a free neutron target or an intense neutron beam, few measurements of neutron-proton bremsstrahlung exist, each having poor statistical accuracy and poor energy resolution. The white neutron source at the Weapons Neutron Research (WNR) target area at the Los Alamos Meson Physics Facility (LAMPF) produces neutrons with energies from below 50 to above 400 MeV. Using time-of-flight techniques and a liquid hydrogen target, we are measuring the outgoing photons of energies up to 250 MeV at gamma ray angles of around 90[degree] relative to the incident beam. Protons scattered at very forward angles are also detected in coincidence with the gamma rays.
Author: Yaşar Safkan
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Category :
Languages : en
Pages : 240
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The triply-differential cross section for neutron-proton bremsstrahlung (np -+ np[gamma]) was measured at the WNR facility of Los Alamos National Laboratory. A liquid hydrogen target was exposed to the pulsed neutron beam, and the scattered neutrons and recoil protons were observed in coincidence at angles of 20°, 28°, and 36° on opposite sides of the beam. Measuring the proton and neutron energies allows the reconstruction of the full kinematics for each event. Events with incident neutron energies between 175 and 275 MeV are included in the data analysis so as to remain below the pion production threshold. The resulting photon angular distributions for each of the nine angle pairs are presented, and are compared with theoretical predictions.
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Category : Nuclear energy
Languages : en
Pages : 612
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Category :
Languages : en
Pages : 42
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Bremsstrahlung is generated in the storage rings of the synchrotron radiation facilities by the radiative interaction of the circulating particle beam with both the residual gas molecules and storage ring components. These bremsstrahlung photons, having an energy range of zero to the maximum energy of the particle beam, interact with beamline components like beam stops and collimators generating photoneutrons of varying energies. There are three main processes by which photoneutrons may be produced by the high energy bremsstrahlung photons: giant nuclear dipole resonance and decay (10 MeV E{sub {gamma}} 30 MeV), quasi-deuteron production and decay (50 MeV
Author: John Whittaker
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ISBN:
Category : Physics
Languages : en
Pages : 222
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Category :
Languages : en
Pages :
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Author: Buddy Boyce Ritchie
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Category :
Languages : en
Pages : 362
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