Pion absorption on ⁴He into the ppd final state

M. Planinic,⁸ D. Androic,⁸ G. Backenstoss,¹ D. Bosnar,⁸ T. Dooling,⁶ M. Furic,⁸ P. A. M. Gram,³ N. K. Gregory,⁴ A. Hoffart,^2,7 C. H. Q. Ingram,⁷ A. Klein,⁶ K. Koch,⁷ J. Köhler,¹ B. Kotlinski,⁷ M. Kroedel,¹ G. Kyle,⁵ A. Lehmann,^1,7 A. O. Mateos,⁴ K. Michaelian,⁷ T. Petkovic,⁸ R. P. Redwine,⁴ D. Rowntree,⁴ N. Simicevic,⁴ R. Trezeciak,² H. Ullrich,² H. J. Weyer,^1,7 M. Wildi,¹ and K. E. Wilson⁴

 

¹University of Basel, CH-4056 Basel, Switzerland
²University of Karlsruhe, D-7500 Karlsruhe, Germany
³LAMPF, Los Alamos, New Mexico 87545
⁴Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
⁵New Mexico State University, Las Cruces, New Mexico 88003
⁶Old Dominion University, Norfolk, Virginia 23529
⁷Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
⁸University of Zagreb, HR-10000 Zagreb, Croatia

(LADS Collaboration)

(Received 7 October 1999; published 5 April 2000)

Results from a 4p solid angle measurement of the reaction p⁺+⁴He®ppd at incident pion energies of T_p⁺ = 70, 118, 162, 239, and 330 MeV are presented. Integrated cross sections are given for the final states with energetic deuterons (ppd) and (pd)p. The differential cross sections are described by a complete set of five independent variables and various other kinematic variables and compared to cascade and phase space models where deuterons were formed by a semiclassical pickup model. The data are investigated for signatures of initial and final state interactions: it is found that more than half of the (ppd) yield cannot be explained by these mechanisms. The remaining strength is reasonably well reproduced by 3N phase space models followed by pickup. ©2000 The American Physical Society

URL: http://link.aps.org/abstract/PRC/v61/e054604
DOI: 10.1103/PhysRevC.61.054604
PACS: 25.80.Ls, 25.10.+s