Initial State Interaction in the ( $\pi^{+}\!\!$,3p) Reaction on N, Ar and Xe

B. Kotliński - et al.

doi:doi:10.1007/s100500050078

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2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A 1, 435-445

Initial State Interaction in the ( $\pi^{+}\!\!$ ,3p) Reaction on N, Ar and Xe

B. Kotlinski⁸ - D. Androic⁹ - G. Backenstoss¹ - D. Bosnar⁹ - H. Breuer⁴ - H. Döbbeling⁸ - T. Dooling⁷ - M. Furic⁹ - P.A.M. Gram³ - N.K. Gregory⁵ - A. Hoffart^2,8 - C.H.Q. Ingram⁸ - A. Klein⁷ - K. Koch⁸ - J. Köhler¹ - M. Kroedel¹ - G. Kyle⁶ - A. Lehmann^1,8 - A.O. Mateos⁵ - K. Michaelian⁸ - T. Petkovic⁹ - M. Planinic⁹ - R.P. Redwine⁵ - D. Rowntree⁵ - U. Sennhauser⁸ - N. Simicevic⁵ - R. Trezeciak² - H. Ullrich² - H.J. Weyer^1,8 - M. Wildi¹ - K.E. Wilson⁵,
(LADS collaboration)

¹ University of Basel, CH-4056 Basel, Switzerland
² University of Karlsruhe, D-76128 Karlsruhe, Germany
³ LAMPF, Los Alamos NM 87545, USA
⁴ University of Maryland, College Park MD 20742, USA
⁵ Massachusetts Institute of Technology, Cambridge MA 02139, USA
⁶ New Mexico State University, Las Cruces NM 88003, USA
⁷ Old Dominion University, Norfolk VA 23529, USA
⁸ Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
⁹ University of Zagreb, HR-10000 Zagreb, Croatia

Received: 11 December 1997 Communicated by B. Povh

Abstract
The pion absorption reaction ( $\pi^{+}$ ,3p) on Ar was studied at pion energies of 70, 118, 162 and 239 MeV, and on N and Xe at 239 MeV. The 3p cross section with a 50 MeV cut on the missing energy is presented. The existence of an initial state interaction (ISI) component to the reaction was investigated. The portion of the 3p cross section assigned to the ISI process is less than one half and at lower energies significantly so.