Title of article
Coherent π0 photoproduction from 4He Original Research Article
Author/Authors
F. Rambo، نويسنده , , P. Achenbach، نويسنده , , J. Ahrens، نويسنده , , H.-J. Arends، نويسنده , , R. Beck، نويسنده , , S.J. Hall، نويسنده , , V. Hejny، نويسنده , , P. Jennewein، نويسنده , , S.S. Kamalov، نويسنده , , M. Kotulla، نويسنده , , B. Krusche and S. Schadmand، نويسنده , , V. Kuhr، نويسنده , , R. Leukel، نويسنده , , V. Metag، نويسنده , , R. Novotny، نويسنده , , V. Olmos de Léon، نويسنده , , A. Schmidt، نويسنده , , M. Schumacher، نويسنده , , U. Siodlaczek، نويسنده , , F. Smend، نويسنده , , et al.، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 1999
Pages
15
From page
69
To page
83
Abstract
Differential cross sections and beam asymmetries for coherent π0 photoproduction from 4He in the Δ 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 Δ-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.
Keywords
Nuclear Reactions 4He(? , ?0)4He , E?=200–400 MeV , Measured total and differential cross sections , Tagged coherent bremsstrahlung beam , New theoretical calculations taking into account in-medium modification of the ? resonance parameters lead to excellent agreement with the experimental data
Journal title
Nuclear physics A
Serial Year
1999
Journal title
Nuclear physics A
Record number
1191403
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