Nuclear Physics A445 (1985) 57-69 ©North-Holland Publishing Company MEASUREMENTS OF PROTON TOTAL REACTION CROSS SECTIONS FOR 6Li, 7Li, 14N, ZONeAND 4°Ar BETWEEN 23 AND 49 MeV t R.F. CARLSON and A.J. COX Department of Physics, Universityof Redlands, Redlands, California 92374, USA T.N. NASR, M.S. DE JONG, D.L. GINTHER, D.K. HASELL, A.M. SOURKES and W.T.H. VAN OERS Department of Physics, Unioersityof Manitoba, Winnipe~ Manitoba, R3T 2N2, Canada D.J. MARGAZIOTIS Department of Physics and Astronomy, California State Unioersity, Los A ngeles, California 90032, USA Received 26 July 1982 (Revised 15 April 1985) Almtraet:. Measurements of proton total reaction cross sections for 6Li, 7Li, laN, 2°Ne and 4°At have been made in the energy range 23 to 49 MeV, using a variation of a standard attenuation technique. The measured cross sections are compared with optical-model and nuclear-transparency calcula- tions. E NUCLEAR REACTIONS 6'7Li, 14N, 2°Ne, 4°Ar(p,X), E= 22.8-49.1 MeV; measured total o(E). Separated isotopes. Calculated total o(E), nuclear transparency. Optical model I. Introduction Total reaction cross section (OR) data provide information of fundamental impor- tance in the study of nuclear systems. For light nuclei, for example, total reaction cross sections provide an important constraint on the imaginary phase-shift analyses of light nucleus elastic scattering data. For heavier nuclei, o R data determine, to a large extent, the purely phenomenological imaginary potential in optical-model analyses 1). Proton elastic scattering differential cross section data and polarization angular distributions in the low- to intermediate-energy range for medium and certain light nuclei have provided a great deal of information about the nucleus * Work supported in part by the Natural Sciences and Engineering Research Council of Canada and by Research Corporation, USA. 57