Spin observables for the pd <-> pi+ t process around the Delta resonance

Details Spin observables for the pd <-> pi+ t process around the Delta resonance Spin observables for the pd <-> pi+ t process around the Delta resonance

1998-01-16

arxiv.org/abs/nucl-th/9801027v1

Phys.Rev.C57:1588-1594,1998

Physics

Nuclear Physics

Nuclear Theory

14 pages, REVTeX, plus 6 figs., PostScript (PRC, to be published)

Scientific paper

10.1103/PhysRevC.57.1588

The proton analyzing power Ay0 and the deuteron tensor analyzing power T20 are evaluated for the pd <-> pi+ t process, in the energy region around and above the Delta resonance. These calculations extend a previous analysis of the excitation function and differential cross-section, based on a model embodying one-- and two-body p-wave absorption mechanisms and isobar excitation. The three-nucleon bound state and the pd scattering state are evaluated through Faddeev techniques for both the Bonn and Paris potentials. The spin variables exhibit a greater sensitivity to the number of included three-nucleon partial waves than the cross-sections, while the role played by the initial-- or final-state interactions appears to be small. The results for the tensor analyzing power at backward angles show a non-negligible dependence on the potentials employed, consistently with what has been previously found for the cross-sections. The calculation of spin observables gives a clear indication that other reaction mechanisms (presumably s-wave two-body absorption) have to be included in the model, in order to reproduce the experimental data below the Delta-resonance, in analogy with the simpler pp <-> pi+ d process.

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