Inhaltszusammenfassung

Differential cross sections and beam asymmetries for coherent pi(0) photoproduction from He-4 in the Delta energy-range have been measured with high statistical and systematic precision using both decay photons for identifying the process. The experiment was performed at the MAinz MIcrotron using the TAPS photon spectrometer and the Glasgow/Mainz tagged photon facility. The differential cross sections are in excellent agreement with predictions based on the DWIA if an appropriate parametrizat...Differential cross sections and beam asymmetries for coherent pi(0) photoproduction from He-4 in the Delta energy-range have been measured with high statistical and systematic precision using both decay photons for identifying the process. The experiment was performed at the MAinz MIcrotron using the TAPS photon spectrometer and the Glasgow/Mainz tagged photon facility. The differential cross sections are in excellent agreement with predictions based on the DWIA if an appropriate parametrization of the Delta-nuclear interaction is applied. The beam asymmetries are interpreted in terms of degrees of linear polarization of collimated coherent bremsstrahlung. The expected increase of the degree of linear polarization with decreasing collimation angle is confirmed. Agreement with calculations is obtained on a few-percent level of precision in the maxima of the coherent peaks. (C) 1999 Elsevier Science B.V. All rights reserved.» weiterlesen» einklappen

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Klassifikation

DFG Fachgebiet:
Teilchen, Kerne und Felder

DDC Sachgruppe:
Physik