Development of a Momentum Determined Electron Beam in the 1 -45 GeV Range

A beam line for electrons with energies in the range of 1 to 45 GeV, low contamination of hadrons and muons and high intensity up to 10^6 per accelerator spill at 27 GeV was setup at U70 accelerator in Protvino, Russia. A beam tagging system based on drift chambers with 160 micron resolution was able to measure relative electron beam momentum precisely. The resolution sigma_p p was 0.13% at 45 GeV where multiple scattering is negligible. This test beam setup provided the possibility to study properties of lead tungstate crystals (PbWO_4) for the BTeV experiment at Fermilab.Comment: 12 pages, 8 figures; work done by the BTeV Electromagnetic Calorimeter grou

Study of Radiation Damage in Lead Tungstate Crystals Using Intense High Energy Beams

We report on the effects of radiation on the light output of lead tungstate crystals. The crystals were irradiated by pure, intense high energy electron and hadron beams as well as by a mixture of hadrons, neutrons and gammas. The crystals were manufactured in Bogoroditsk, Apatity (both Russia), and Shanghai (China). These studies were carried out at the 70-GeV proton accelerator in Protvino

Beam test results of a PbWO4 crystal calorimeter prototype

Beam tests of an EM-calorimeter prototype made of PbWO4 crystals, produced after significant improvement in growth technology, have been performed at the CERN SPS. The measured energy resolution is σE/E = 2.8%/√E ⊕ 0.47%. © 1995.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

POLARIZATION EFFECTS IN CHARGE-EXCHANGE REACTION AT 40 GeV/c

Nous présentons des résultats obtenus dans l'étude des réactions π-p → π°n, π-p → ηn, π-p → η'(958)n, π-p → f (1270)n à 40 GeV/c. Nous avons observé quelques nouveaux phénomènes dans le comportement de ces réactions.The results on measuring the asymmetries in the reactions π-p → π°n, π-p → ηn, π-p → η'(958)n, π-p → f (1270)n at 40 GeV/c are presented. Some new phenomena have been discovered in the asymmetry behaviour in these reactions