Coherent pi(0) photo-production on He-4 at intermediate energies with polarized photons

Authors
Bellini, V Capogni, M Caracappa, A Casano, L D' Angelo, A Ghio, F Girolami, B Hoblit, S Hu, L Khandaker, M Kistner, OC Miceli, L Moricciani, D Sandorfi, AM Schaerf, C Sperduto, ML Thorn, CE
Citation
V. Bellini et al., Coherent pi(0) photo-production on He-4 at intermediate energies with polarized photons, NUCL PHYS A, 646(1), 1999, pp. 55-66
Citations number
13
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS A
ISSN journal
03759474 → ACNP
Volume
646
Issue
1
Year of publication
1999
Pages
55 - 66
Database
ISI
SICI code
0375-9474(19990201)646:1<55:CPPOHA>2.0.ZU;2-E
Abstract
The reaction He-4(<(gamma)over right arrow>,pi(0))He-4 has been studied wit h the LEGS tagged, polarized gamma-ray beam, Data are presented at laborato ry angles of 31 degrees, 45 degrees, 72.5 degrees, 90 degrees, 110 degrees and 130 degrees for incoming photon energies of 206, 219, 232, 245, 259, 27 4, 289, 306 and 322 MeV. The unpolarized cross sections are compared with t he Delta-hole theoretical model results available in literature. The measur ed photon beam asymmetry is -1 as expected from conservation of angular mom entum and parity. (C) 1999 Published by Elsevier Science B.V.