https://doi.org/10.1140/epja/i2006-10099-3
Hadron Physics
Study of spectator tagging in the reaction np → ppπwith a deuteron beam
1
Institut für Kern- und Teilchenphysik, Technische Universität Dresden, D-01062, Dresden, Germany
2
Physikalisches Institut, Universität Erlangen, D-91058, Erlangen, Germany
3
Physikalisches Institut, Universität Tübingen, D-72076, Tübingen, Germany
4
Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany
5
Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, D-01314, Dresden, Germany
6
Andrzej Soltan Institute for Nuclear Studies, PL-00681, Warsaw, Poland
* e-mail: e.kuhlmann@physik.tu-dresden.de
Received:
16
May
2006
Accepted:
11
September
2006
Published online:
22
September
2006
The reaction 
has been studied in a kinematically complete experiment at a single beam momentum 
GeV/c (T = 759MeV). All four ejectiles have been detected in the large-acceptance time-of-flight spectrometer COSY-TOF. We analyzed the data along the lines of the spectator model as a means to isolate the quasi-free 
reaction. The spectator proton was identified by its momentum and flight direction thus yielding access to the associated Fermi motion of the bound neutron. A comparison is carried out with Monte Carlo simulations based on two different parameterizations of the deuteron wave function. Up to a Fermi momentum of roughly 150MeV/c no significant deviations between experimental and simulated data of various observables were found from which we conclude that the deuteron can indeed be taken as a valid substitute for the neutron.
PACS: 13.75.Cs Nucleon-nucleon interactions – / 25.10.+s Nuclear reactions involving few-nucleon systems – / 29.20.Dh Storage rings – / 29.90.+r Other topics in elementary-particle and nuclear physics experimental methods and instrumentation –
© Società Italiana di Fisica and Springer-Verlag, 2006
