Phys. Rev. C 49, R2276 - R2280 (1994)Excitation function for 4He(π+,pp)2H two-nucleon absorption across the Δ resonance |
H. Breuer, M. G. Khayat, F. Adimi, B. S. Flanders, M. A. Khandaker, P. G. Roos, and D. Zhang
Department of Physics, University of Maryland, College Park, Maryland 20742
Th. S. Bauer and J. Konijn
NIKHEF-K, P.O. Box 4395, NL 1009 AJ Amsterdam, The Netherlands
C. T. A. M. de Laat
Physics Laboratory, University Utrecht, P.O. Box 80000, 3508 TA Utrecht, The Netherlands
G. S. Kyle, S. Mukhopadhyay, and M. Wang
Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003
T. Tacik
University of Karlsruhe, 7500 Karlsruhe, Germany
Received 23 December 1993
Angular distributions and total cross sections for the 4He(π+,pp)2H reaction have been measured with small relative uncertainties at incident energies of Tπ+=64, 87, 114, 162, 217, 278, and 327 MeV. The results strongly support the quasideuteron absorption model for pion absorption on two nucleons, which is found to contribute only ≊50% to the total absorption cross section near the Δ resonance. All essential reaction channels of pion absorption near the Δ resonance on heavier nuclei seem to be present in 4He, but not in 3He. Any nuclear-density-related increase of pion absorption in 4He relative to 2H is <50% and no binding energy effect is found.
©1994 The American Physical Society
URL: http://link.aps.org/abstract/PRC/v49/pR2276
DOI: 10.1103/PhysRevC.49.R2276
PACS: 25.80.Ls, 27.10.+h, 21.45.+v, 24.10.-i
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