Dipolar angular distributions and branching ratio of xenon 4d photoelectrons in the photon energy range of 100-250 eV
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The angular distribution of high-energy (0.4 to 0.8 Mev) photoelectrons produced in Pb and Au foils by linearly polarized photons has been investigated using scintillation counting and pulse-height analysis techniques. A Compton-scattered photon beam from ${\mathrm{Co}}^{60}$ provided a source of partially polarized radiation. Experimental results confirm the theoretical prediction of predominate photoemission orthogonal to the electric vector of the incident photon for photoelectron energies greater than 0.5 Mev.
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The azimuth angular distribution of photoelectrons ejected from lead by linearly polarized 0.51-Mev photons has been studied. The known correlation between polarization states of annihilation quanta was employed in preparation of the incident beam of polarized photons. Results indicate that for emission from the $K$ shell, the most probable direction is in the plane containing the momentum and polarization vectors of the incident photon. The asymmetry in the distribution thereby produced is slightly greater than that expected from the relativistically computed differential cross section.
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Detection and measurements of light-light scattering were accomplished by using laser photons and bremsstrahlung quanta generated by high energy electron beams. In the scattering of 33 to 40 Bev gamma quanta generated by electrons in the laser beam, 10 to 15 photons per hour were recorded with 500-Mev energies. (R.V.J.)
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We calculate the performance of possible Advanced Photon Source (APS) {gamma}-ray sources for applications in nuclear physics research. For the APS storage ring, it is possible to generate tagged {gamma}-ray photon fluxes of 10{sup 8}, 0.7 x 10{sup 8}, and 0.3 x 10{sup 8} photons/s at photon energies of 1, 1.7, and 2.8 GeV, respectively. For untagged photons, fluxes higher than 10{sup 8} photons/s are possible for those energies. For the injection booster, an untagged {gamma}-ray photon flux up to 10{sup 8} photons/s at energy ranging from 5 MeV to 1 GeV is possible. This can be achieved using off-the-shelf commercial Ti:Sa laser systems. The photon fluxes predicted here are in general one to two orders of magnitude higher than facilities with similar photon energies.
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Measurements on the angular distributions of the 4d, 5s and 5p photoelectrons from xenon have been made using synchrotron radiation from a 5 GeV electron synchrotron. The importance of including intershell correlation effects is demonstrated by the results on the 5p electrons. The data indicate not only the limitations of the single-particle theories, but also, in the case of the 5p electrons beyond the 4d ionization threshold, the inadequacies of the present RPAE theory.
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