Coherent π0 photo-production on 4He at intermediate energies with polarized photons
✍ Scribed by V. Bellini; M. Capogni; A. Caracappa; L. Casano; A. D'Angelo; F. Ghio; B. Girolami; S. Hoblit; L. Hu; M. Khandaker; O.C. Kistner; L. Miceli; D. Moricciani; A.M. Sandorfi; C. Schaerf; M.L. Sperduto; C.E. Thorn
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 496 KB
- Volume
- 646
- Category
- Article
- ISSN
- 0375-9474
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✦ Synopsis
The reaction 4He(~,~r°)4He has been studied with the LEGS tagged, polarized gamma-ray beam. Data are presented at laboratory angles of 31 °, 45 °, 72.5 °, 90 °, 110 ° and 130 ° for incoming photon energies of 206, 219, 232, 245,259, 274, 289, 306 and 322 MeV. The unpolarized cross sections are compared with the A-hole theoretical model results available in literature. The measured photon beam asymmetry is -1 as expected from conservation of angular momentum and parity.