Novel transmission detector used for total cross section measurements

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 235; no. 3; pp. 523 - 535
• Main Authors: Arignon, M., Azaiez, H., Bystricky, J., Deregel, J., Drompt, P., Fontaine, J.M., Gosset, J., Hasegawa, T., Heer, E., Hess, R., Lehar, F., Leo, W., Martin, A., Morenzoni, S., Newsom, C.R., Onel, Y., Penzo, A., Perrot, F., Rapin, D., Siemiarczuk, T., Simmons, J.E., Van Rossum, L., Veluard, P., Vrzal, J., Whitten, C.A., Yonnet, J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.1985
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/0168-9002(85)90103-2

A new apparatus for total cross section measurements was developed and tested at Saturne II, Sacalay. The transmission ratios are determined using a ring-counter system coded in the Gray code, involving an exclusive four-fold coincidence between 4 counters among 8. Beam rate effects are suppressed by an electronic device which permits reaching an accuracy of better than 10 −4 in any transmission ratio. The apparatus was first used at SIN for the measurements of the total polarized proton-proton cross section difference Δσ L and of the spin correlation parameter A 00 kk in pp → pp and pp → dπ + reactions, and then at Saturne II for Δσ γ and Δσ L measurements in p-p scattering.