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HK: Hadronen und Kerne

HK 27: Hadronic Probes III, Particle Production

HK 27.5: Talk

Tuesday, March 17, 1998, 15:30–15:45, C

Pion Production from dp→ dNπ reactions with deuteron beams at CELSIUS — •J. Greiff¹, I. Koch², H. Rohdjeß³, W. Scobel¹, and Wasa/Promice⁴ — ¹I. Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, D22761 Hamburg — ²Dep. of Radiation Sciences, Uppsala University, Box 535, S75121 Uppsala — ³Institut für Strahlen– und Kernphysik, Universität Bonn, Nußallee 14-16, D53115 Bonn — ⁴

The pd system is the simplest one to study the influence of a multinuclear environment on a hypothetical quasi–free NN→ NNπ process. The recently measured excitation functions σ_{pd→ pdπ^∘}(T_p) could be described as a quasi–free pn→ dπ^∘ interaction plus a spectator proton, whereas the observed energy spectra indicated substantial contributions from an additional reaction mechanism [1,2]. Close to the 2N threshold, however, a spectator proton is at rest and escapes direct observation.

Therefore this and the isospin related reaction dp → dnπ⁺ have been measured with deuteron projectiles of energies between the 3N and the quasifree 2N threshold at the CELSIUS accelerator of the TSL, Uppsala. The WASA/PROMICE detector used allowed to cover a large fraction of the accessible phase space. First results will be presented.

[1] H. Rohdjeß et al., Phys. Rev. Lett. 70, 2864 (1993)

[2] J. Greiff et al., Acta Phys. Polonica B27, 2965 (1996)