pi- absorption on the diproton in He-3

Niskanen, J.A.

doi:10.1103/PhysRevC.43.36

pi- absorption on the diproton in He-3

J.A. Niskanen
(
- TRIUMF and
- Helsinki U.
)

1991

14 pages

Published in:

Phys.Rev.C 43 (1991) 36-49

DOI:

10.1103/PhysRevC.43.36

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Abstract: (APS)

Absorption of negative pions on 1S0 proton pairs is studied in a model which treats the two nucleon final-state interactions (including isobar components, which simulate pion p-wave scattering) in an exact way, but leaves the third nucleon an inactive spectator. Pion s-wave rescattering is included by a phenomenological Hamiltonian. Otherwise the initial-state pions are considered undistorted. The influence of different proton pair wave functions, final-state interactions, and pion-nucleon vertex forms is studied. The experimentally observed asymmetry of the cross section about 90° is obtained only if a Galilean-invariant pion absorption operator is used. The final-state interaction is particularly important in the tensor coupled 3S1−3D1 states, with the final 3D1 state emerging as the dominant one. The normal polarization of outcoming protons is similar to the analyzing power in the reaction p→+n→(pp)Swave+π− and is very insensitive on any details of the dynamical input. Also the polarization correlation coefficients show relatively little dependence on the model being rather constrained by kinematics.

pi- nucleus: nuclear reaction
helium: nuclide
model: absorption
absorption: model
p: dibaryon
nucleon resonance: effect
effect: nucleon resonance
angular distribution
p: polarization
polarization: p

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