Abstract
Study of light hyperon production in nucleon-nucleon interactions is a large part of scientific program at the ANKE-spectrometer which is an internal-beam experiment at the Cooler Synchrotron (COSY-Juelich). The Σ− production in pn collisions was studied at two proton beam momenta of 2915 MeV/c and 3015 MeV/c. The deuterium target was exploited as an effective neutron target due to measurement of "spectator" proton momentum to determine the energy of reaction. The Fermi motion allowed to cover a wide range of excess energy Q = 30 – 130 MeV where data was absent. The Σ− production was identified by the missing mass technique. Preliminary result for the energy dependence of the pn → pK+Σ− total cross section is presented.
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