On the extraction of cross sections for π0 and η photoproduction off neutrons from deuteron data

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• 作者：V. E. Tarasov ; W. J. Briscoe ; M. Dieterle ; B. Krusche…
• 刊名：Physics of Atomic Nuclei
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：79
• 期：2
• 页码：216-227
• 全文大小：1,071 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Elementary Particles and Nuclei
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1562-692X
• 卷排序：79

文摘

We discuss the procedure of extracting the photoproduction cross section for neutral pseudoscalar mesons off neutrons from deuteron data. The main statement is that the final-state-interaction corrections for the proton and neutron target are in general not equal, but for π0 production there are special cases where they have to be identical and there are large regions in the parameter space of incident photon energy and pion polar angle, Θ*, where they happen to be quite similar. The corrections for both target nucleons are practically identical for π0 production in the energy range of the Δ(1232)3/2+ resonance due to the specific isospin structure of this excitation. Also above the Δ-isobar range large differences between proton and neutron correction factors are only predicted for extreme forward angles (Θ* *lt; 20°), but the results are similar for larger angles. The case of η photoproduction is also briefly considered. Numerical results for the γp → π0p and γn → π0n correction factors are discussed. Also the model description for the available data on the differential γd → π0pn cross sections are given.The text was submitted by the authors in English.