Novel transmission detector used for total cross section measurements |
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| Authors: | M. Arignon H. Azaiez J. Bystricky J. Deregel P. Drompt J.M. Fontaine J. Gosset T. Hasegawa E. Heer R. Hess F. Lehar W. Leo A. Martin S. Morenzoni C.R. Newsom Y. Onel A. Penzo F. Perrot J. Yonnet |
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| Affiliation: | 1. DPhE CEN-Saclay, 91191 Gif-sur-Yvette Cedex, France;2. LAPP Annecy, France;3. DPNC, University of Geneva, Geneva, Switzerland;4. DPhNME CEN-Saclay, 91191 Gif-sur-Yvette Cedex, France;5. LNS Saclay, 91191 Gif-sur-Yvette Cedex, France;6. INFN Trieste, Trieste Italy |
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| Abstract: | 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 ΔσL and of the spin correlation parameter A00kk in pp → pp and pp → dπ+ reactions, and then at Saturne II for Δσγ and ΔσL measurements in p-p scattering. |
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