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In order to measure the mass of the η meson with high accuracy using the  dp → 3He η reaction, the momentum of the  circulating deuteron beam in the Cooler Synchrotron COSY of the  Forschungszentrum Jülich has to be determined with unprecedented precision. This  has been achieved by studying the spin dynamics of the polarized deuteron beam.  By depolarizing the beam through the use of an articially induced spin  resonance, it was possible to evaluate its momentum p with a  precision of ∆p/p < 10−4 for a momentum of  roughly 3 GeV/c

High precision beam momentum determination in a synchrotron using a spin resonance method