Coherent pi(0) photoproduction from He-4

Citation
F. Rambo et al., Coherent pi(0) photoproduction from He-4, NUCL PHYS A, 660(1), 1999, pp. 69-83
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS A
ISSN journal
0375-9474 → ACNP
Volume
660
Issue
1
Year of publication
1999
Pages
69 - 83
Database
ISI
SICI code
0375-9474(19991115)660:1<69:CPPFH>2.0.ZU;2-9
Abstract
Differential cross sections and beam asymmetries for coherent pi(0) photopr oduction from He-4 in the Delta energy-range have been measured with high s tatistical and systematic precision using both decay photons for identifyin g the process. The experiment was performed at the MAinz MIcrotron using th e TAPS photon spectrometer and the Glasgow/Mainz tagged photon facility. Th e differential cross sections are in excellent agreement with predictions b ased on the DWIA if an appropriate parametrization of the Delta-nuclear int eraction is applied. The beam asymmetries are interpreted in terms of degre es of linear polarization of collimated coherent bremsstrahlung. The expect ed increase of the degree of linear polarization with decreasing collimatio n angle is confirmed. Agreement with calculations is obtained on a few-perc ent level of precision in the maxima of the coherent peaks. (C) 1999 Elsevi er Science B.V. All rights reserved.