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Single-pion production in pp collisions at 0.95 GeV/c (II)

Authors:	S Abd El-Samad R Bilger K -Th Brinkmann H Clement M Dietrich E Doroshkevich S Dshemuchadse K Ehrhardt A Erhardt W Eyrich A Filippi H Freiesleben M Fritsch R Geyer A Gillitzer J Hauffe D Hesselbarth R Jaekel B Jakob L Karsch K Kilian J Kress E Kuhlmann S Marcello S Marwinski R Meier K M?ller H P Morsch L Naumann J Ritman E Roderburg P Sch?nmeier M Schulte-Wissermann W Schroeder F Stinzing G Y Sun J W?chter G J Wagner M Wagner U Weidlich A Wilms S Wirth G Zhang P Zupranski

Institution:	8. Atomic Energy Authority NRC Cairo, Cairo, Egypt 6. Physikalisches Institut der Universit?t Tübingen, Tübingen, Germany 2. Technische Universit?t Dresden, Dresden, Germany 5. Forschungszentrum Rossendorf, Dresden, Germany 3. Friedrich-Alexander-Universit?t Erlangen-Nürnberg, Erlangen-Nürnberg, Germany 7. University of Torino and INFN, Sezione di Torino, Torino, Italy 1. Ruhr-Universit?t Bochum, Bochum, Germany 4. Forschungszentrum Jülich, Jülich, Germany 9. Soltan Institute for Nuclear Studies, Warsaw, Poland

Abstract:	The single-pion production reactions pp $\rightarrow$ d $\pi^{+}_{}$ , pp $\rightarrow$ np $\pi^{+}_{}$ and pp $\rightarrow$ pp $\pi^{0}_{}$ were measured at a beam momentum of 0.95GeV/c ( T _p $\approx$ 400 MeV) using the short version of the COSY-TOF spectrometer. The central calorimeter provided particle identification, energy determination and neutron detection in addition to time-of-flight and angle measurements from other detector parts. Thus all pion production channels were recorded with 1-4 overconstraints. The main emphasis is put on the presentation and discussion of the np $\pi^{+}_{}$ channel, since the results on the other channels have already been published previously. The total and differential cross-sections obtained are compared to theoretical calculations. In contrast to the pp $\pi^{0}_{}$ channel we observe in the np $\pi^{+}_{}$ channel a strong influence of the $\Delta$ excitation. In particular, the pion angular distribution exhibits a (3 cos² $\Theta$ + 1) -dependence, typical for a pure s -channel $\Delta$ excitation and identical to that observed in the d $\pi^{+}_{}$ channel. Since the latter is understood by a s -channel resonance in the ¹ D ₂ pn partial wave, we discuss an analogous scenario for the pn $\pi^{+}_{}$ channel.

Keywords:	PACS" target="_blank">PACS 13 75 Cs Nucleon-nucleon interactions (including antinucleons deuterons etc ) 14 20 Gk Baryon resonances with S = 0 14 20 Pt Dibaryons 25 10 +s Nuclear reactions involving few-nucleon systems
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