1996/12/19 by H. Kamada, M. P. Locher, M.P. Locher +7 · 1 citation
Physics and Astronomy · #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #Scientific Research and Discoveries #nucl-th
paper · pdf · doi:10.1103/physrevc.55.2563
published as Phys.Rev.C55:2563-2570,1997 · 12 pages, REVTeX, 10 PostScript figures, submitted to Phys. Rev. C
arxiv created 1996/12/19 · openalex publication_date 1997/05/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The absorption of \ensuremathπ+ on 3He in the \ensuremathΔ region is evaluated with exact inclusion of the final state interaction among the three emerging protons. The absorption is described by a \ensuremathπN\ensuremath→\ensuremathΔ vertex and an N\ensuremathΔ-NN transition t matrix which are calculated from a phenomenological model for NN and \ensuremathπd reactions. In a calculation where the initial pion scattering effects are neglected, the predicted peaks of the pion absorption cross sections for 2H and 3He lie too high in energy in relation to the data. The effect of the final-state three-nucleon interaction turns out to be too small for changing the magnitude and shifting the peak position of the total absorption cross section for 3He. We demonstrate that the adjustment of the peak position for the deuteron cross section by small modifications of the \ensuremathΔ parameters automatically leads to the correct peak position in 3He.