30 December 1999 Ž . Physics Letters B 471 1999 113–118 Inclusive measurements of pionic double charge exchange on 3 He at low energies CHAOS Collaboration J. Grater a , R. Bilger a , H. Clement a , R. Meier a, ) , J. Patzold a , G.J. Wagner a , ¨ ¨ E. Friedman b , E.L. Mathie c , R. Tacik c , M. Yeomans c , P.A. Amaudruz d , L. Felawka d , D. Ottewell d , K. Raywood d , G.R. Smith d , G.J. Hofman e , B. Jamieson e , M. Kermani e , G. Tagliente e , P. Camerini f , E. Fragiacomo f , N. Grion f , R. Rui f , J. Clark g , G. Moloney g , M.E. Sevior g , A. Nefediev h , M. Schepkin h , E.F. Gibson i , O. Patarakin j , H. Staudenmaier k , S.N. Filippov l , Yu.K. Gavrilov l , T.L. Karavicheva l a Physikalisches Institut, UniÕersitat Tubingen, Auf der Morgenstelle 14, 72076 Tubingen, Germany ¨ ¨ ¨ b Racah Institute of Physics, The Hebrew UniÕersity, Jerusalem 91904, Israel c UniÕersity of Regina, Regina Saskatchewan S4S 0A2, Canada d TRIUMF, 4004 Wesbrook Mall, VancouÕer BC V6T 2A3, Canada e Department of Physics and Astronomy, UniÕersity of British Columbia, VancouÕer BC V6T 2A6, Canada f UniÕersity and INFN Trieste, 34127 Trieste, Italy g School of Physics, UniÕersity of Melbourne, ParkÕille, Victoria 3052, Australia h ITEP Moscow, 117218 Moscow, Russia i California State UniÕersity, Sacramento, CA, USA j RRC KurchatoÕ Institut, 123182 Moscow, Russia k UniÕersitat Karlsruhe, Karlsruhe, Germany ¨ l Institute for Nuclear Research, 117312 Moscow, Russia Received 21 September 1999; received in revised form 3 November 1999; accepted 10 November 1999 Editor: V. Metag Abstract Using the CHAOS spectrometer at TRIUMF pion momentum spectra and angular distributions were measured for the 3 Ž y q . He p ,p reaction at incident energies from 65 to 120 MeV and total cross sections were deduced. The data are compared to Monte Carlo simulations for the conventional reaction process as well as to predictions for the production of the hypothetical p NN resonance d X with and without collision damping. q 1999 Published by Elsevier Science B.V. All rights reserved. PACS: 25.80.Gn; 14.20.Pt; 25.10 Keywords: Pionic double charge exchange; 3 He target; Dibaryon ) Ž . Ž . Corresponding author. Tel.: 49 -7071-2973286, Fax: 49 -7071-295373; Email: rmeier@pit.physik.uni-tuebingen.de 0370-2693r99r$ - see front matter q 1999 Published by Elsevier Science B.V. All rights reserved. Ž . PII: S0370-2693 99 01353-2