Pion absorption in flight on 4He
1990; Elsevier BV; Volume: 517; Issue: 3-4 Linguagem: Inglês
10.1016/0375-9474(90)90210-d
ISSN1873-1554
AutoresM. Steinacher, G. Backenstoss, M. Iźycki, P. Salvisberg, Peter Weber, H. J. Weyer, A. Hoffart, B. Rzehorz, H. Ullrich, Mario Džemidžić, M. Furić, Tomislav Petković,
Tópico(s)High-Energy Particle Collisions Research
ResumoWe have measured double and triple coincidences following π+ and π− absorption on 4He at various pion energies. Differential and integrated cross sections are determined for all possible absorption channels. We study and compare the two-nucleon absorption on nucleon pairs with isospin I = 0 and I = 1. In the dNN final-state two absorption mechanisms are identified, one with only one spectator nucleon and one with phase-space behavior. The existence of a three-nucleon absorption component with a spectator nucleon is established and a four nucleon phase-space-like contribution is also identified and found to be small. The total absorption cross section is directly determined by adding the integrated cross sections of all measured reaction channels.
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