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EPJ C - Particles and Fields
Particles and Fields


Eur. Phys. J. C 25, 55-65 (2002)
DOI: 10.1007/s10052-002-01002-2

Analysing power for the reaction $\mathrm{np} \rightarrow \mathrm{pp} \pi^{-}$ and for np elastic scattering from 270 to 570 MeV

M. Daum1, M. Finger2, 3, M. Finger Jr.3, J. Franz4, F.H. Heinsius4, A. Janata3, K. Königsmann4, H. Lacker4, F. Lehar5, H. Schmitt4, W. Schweiger4, P. Sereni4 and M. Slunecka2, 3

1  PSI, Paul-Scherrer-Institut, 5232 Villigen, Switzerland
2  Charles University, Faculty of Mathematics and Physics, V Holesovickách 2, 18000 Praha 8, Czech Republic
3  Joint Institute for Nuclear Research, LNP, 141980 Dubna, Moscow Region, Russia
4  Fakultät für Physik der Universität Freiburg, 79104 Freiburg, Germany
5  DAPNIA/SPP, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France

(Received: 3 December 2001 / Revised version: 4 June 2002 / Published online: 26 July 2002 )

Abstract
The analysing power of the reaction ${\rm n}{\rm p} \rightarrow {\rm p}{\rm p} \pi^{-}$ for neutron energies between threshold and 570 MeV has been determined using a transversely polarised neutron beam at PSI. The reaction has been studied in a kinematically complete measurement using a time-of-flight spectrometer with large acceptance. Analysing powers have been determined as a function of the c.m. pion angle in different regions of the proton-proton invariant mass. They are compared to other data from the reactions ${\rm n}{\rm p} \rightarrow {\rm p}{\rm p} \pi^{-}$ and ${{\rm p}{\rm p} \rightarrow {\rm p}{\rm p} \pi^{0}}$. The np elastic scattering analysing power was determined as a by-product of the measurements.



© Società Italiana di Fisica, Springer-Verlag 2002

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