Asymmetry of bremsstrahlung from polarized electrons

Haug, E.

doi:10.1007/s004600050002

Cited by 14 publications

(15 citation statements)

References 13 publications

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“…Fig. 10 presents the data of Shaffer et al (1996) compared with the experimental results of Mergl et al (1992) and the theory of Haug (1996). The agreement between the two theories is quite good.…”

Section: Article In Pressmentioning

confidence: 54%

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Photon polarization and spin asymmetry in the elementary process of bremsstrahlung

Nakel

2006

Radiation Physics and Chemistry

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Section: Article In Pressmentioning

confidence: 54%

“…9. The full curve depicts a calculation of Haug (1996), and the dashed curve is the pertinent triply differential cross section for unpolarized primary electrons from the theory of Elwert and Haug (1969) using Sommerfeld-Maue eigenfunctions. The region of validity can be expressed by aZ51.…”

Section: Article In Pressmentioning

confidence: 99%

Photon polarization and spin asymmetry in the elementary process of bremsstrahlung

Nakel

2006

Radiation Physics and Chemistry

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“…The error bars represent the standard deviations only; the systematic error of the asymmetry scale was estimated to be $2%. The solid line is a calculation of the spin asymmetry according to the theory of Haug [10]. b Triply differential cross section of bremsstrahlung for the same parameters as in a but for an unpolarized primary beam.…”

mentioning

confidence: 99%

“…2b and 3b. The full curves are calculations according to the theory of Haug [10]. As the theory is described in detail in the accompanying paper of Haug [10] we will only make some general remarks in brief.…”

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Asymmetry of bremsstrahlung from transversely polarized electrons

Geisenhofer

Nakel

1996

Z Phys D - Atoms, Molecules and Clusters

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By using an electron-photon coincidence method the photon emission asymmetry in the elementary process of bremsstrahlung from transversely polarized electrons was measured. For an electron beam of 300 keV incident on a gold target the asymmetry for spin up and down of the primary beam was measured for fixed directions of the outgoing electrons and photons as a function of the energy split. Asymmetries up to 30% were found. The measurements are a proper test for theories going beyond the first Born approximation. : 34.80.-i; 34.90. #q Bremsstrahlung emitted by a beam of transversely polarized electrons in the Coulomb field of an atomic nucleus shows a left-right asymmetry in the angular distribution when the spin direction is perpendicular to the photon emission plane defined by the momenta of the incoming electron and the emitted photon. PACSDisregarding the decelerated outgoing electrons such left-right photon emission asymmetries have been measured by several groups [1][2][3]. However, since in all these experiments only the emitted photons have been observed, the results are necessarily averaged over all electron scattering angles. Therefore the test of theoretical predictions is not as strong as it could be. To get detailed information on the elementary collision process [4] Mergl et al.[5] performed a coincidence measurement between outgoing electrons and photons emitted by a transversely polarized beam. The authors measured the photon emission asymmetry for spin up and down of the primary beam as a function of the photon emission angle for fixed directions of the outgoing electrons and for fixed energy split between photons and electrons.In the present paper we report on a measurement of the photon emission asymmetry for spin up and down of the primary beam as a function of the energy split between outgoing electrons and photons for fixed directions of the outgoing electrons and photons. That means the goal of the measurement is the same as in our first experiment [5], but now the theory is checked by varying different variables. For this a two-parameter energy-sharing coincidence experiment was built up.A sketch of the experimental arrangement is shown in Fig. 1. The source of the polarized electron beam (the same as in [5] and described in detail elsewhere [6]) used the photoemission of electrons from a GaAsP crystal irradiated by circularly polarized light of a helium-neon laser. After being deflected by a 90°cylindrical deflector, the extracted electrons are transversely polarized. The spin flip of the electron beam can be easily achieved by reversing the helicity of the laser light. The source is installed in a high voltage terminal of a 300-kV accelerator tube and produces a continuous transversely polarized beam with a polarization degree in the range of 35% to 40%. The degree of spin polarization was measured by a Mott analyzer put into the beam line in front of the entrance of the scattering chamber.In the Mott analyzer the electrons scattered through 120°by a gold foil were detected by a pair o...

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Entwicklung metallorganisch basierter Keramiken

Gadow¹,

Kienzle²

1998

Materialwissenschaft Werkst

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Ausgangspunkt des Polymer‐Pyrolyse‐Verfahrens stellen hochreine monomere Precursor dar, die über Additions‐ oder Kondensationsreaktionen polymerisiert und durch Pyrolyse unter Schutzgasatmosphäre in amorphe Keramiken überführt werden. Durch Tempern bei erhöhter Temperatur können die Keramiken zur Kristallisation gebracht werden. Die Pyrolyse von Polysilanen und Polycarbosilanen ergibt Si‐C‐Keramiken, Polysiloxane werden in Si‐C‐O‐Keramiken und Polysilazane bzw. Polysilylcarbodiimide in Si‐C‐N‐ oder Si3N4‐Keramiken umgewandelt. Durch Kombination verschiedener Precursormaterialien lassen sich über die Polymer‐Pyrolyse‐Route Multikomponentenkeramiken außerordentlicher Homogenität und mit vielfältigen Eigenschaften herstellen. Die erreichbaren keramischen Ausbeuten liegen je nach Precursorsystem bei bis zu 90%. Die beschriebenen Keramiken finden Anwendungen in Form monolithischer Formkörper, als Fasern oder faserverstärkte Verbundwerkstoffe oder als über Dip‐Coating hergestellte Schichten.

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Asymmetry of bremsstrahlung from polarized electrons

Cited by 14 publications

References 13 publications

Photon polarization and spin asymmetry in the elementary process of bremsstrahlung

Photon polarization and spin asymmetry in the elementary process of bremsstrahlung

Asymmetry of bremsstrahlung from transversely polarized electrons

Entwicklung metallorganisch basierter Keramiken

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