ScienceDirect - Physics Letters B : Contribution of initial state interactions to the three-nucleon absorption of pions by 3He

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Physics Letters B
Volume 379, Issues 1-4 , 27 June 1996, Pages 60-66

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doi:10.1016/0370-2693(96)00326-7

Contribution of initial state interactions to the three-nucleon absorption of pions by ³He

LADS Collaboration , G. Backenstoss^a, D. Bosnarⁱ, H. Breuer^d, H. Döbbeling^h, T. Dooling^g, M. Furiⁱ, P. A. M. Gram^c, N. K. Gregory^e, A. Hoffart^h^,^b, C. H. Q. Ingram^h, A. Klein^g, K. Koch^h, J. Köhler^a, B. Kotliski^h, M. Kroedel^a, G. Kyle^f, A. Lehmann^a, A. O. Mateos^e, K. Michaelian^h, T. Petkoviⁱ, R. P. Redwine^e, D. Rowntree^e, U. Sennhauser^h, N. imievi^e, R. Trezeciak^b, H. Ullrich^b, M. Wang^f, M. H. Wang^f, H. J. Weyer^h^,^a, M. Wildi^a and K. E. Wilson^e

^a University of Basel, CH-4056, Basel, Switzerland
^b University of Karlsruhe, D-7500, Karlsruhe, Germany
^c LAMPF, Los Alamos, NM 87545, USA
^d University of Maryland, College Park, MD 20742, USA
^e Massachusetts Institute of Technology, Cambridge, MA 02139, USA
^f New Mexico State University, Las Cruces, NM 88003, USA
^g Old Dominion University, Norfolk, VA 23529, USA
^h Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
ⁱ University of Zagreb, HR-41001, Zagreb, Croatia

Received 18 December 1995; Revised 28 February 1996. Editor: J.P. Schiffer Available online 7 June 1999.

Abstract

The distributions of protons after the absorption of positive pions by ³He at 118, 162 and 239 MeV are presented. A decomposition of the three-nucleon cross section in terms of initial state interactions and other processes is given, based upon simple models. A clear signal of initial state interactions is visible in the data, diminishing at the lower energies.