Spectator tagging in quasi-free proton-neutron interactions in deuterium using an internal cluster-jet target at a storage ring

Citation
R. Bilger et al., Spectator tagging in quasi-free proton-neutron interactions in deuterium using an internal cluster-jet target at a storage ring, NUCL INST A, 457(1-2), 2001, pp. 64-74
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
0168-9002 → ACNP
Volume
457
Issue
1-2
Year of publication
2001
Pages
64 - 74
Database
ISI
SICI code
0168-9002(20010111)457:1-2<64:STIQPI>2.0.ZU;2-#
Abstract
Low-energy spectator protons (p(s)) from quasi-free proton-neutron interact ions on deuterium have been measured for the pd --> d pi (0)p(s) and pd --> pn pi (0)p(s) reactions at the CELSIUS storage ring of the The Svedberg La boratory. The experiment used 320 MeV protons incident on a deuterium clust er-jet target. The spectator protons were detected inside the scattering ch amber using a silicon detector system which is compatible with a high vacuu m. The low target density allows the spectator proton emerge without underg oing significant secondary scattering. Its measurement is therefore a usefu l tag upon such reactions, allowing cross-sections for quasi-free reactions to be deduced at well-defined centre-of-mass energies. The comparison with the simulation for the pd --> d pi (0)p(s) reaction shows that the energy dependence of the pn --> d pi (0) cross-section can be extracted near the t hreshold. The method greatly improves the experimental resolution achievabl e in quasi-free p-n reaction studies. (C) 2001 Elsevier Science B.V. All ri ghts reserved.