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

Abstract

In order to measure the mass of the eta meson with high accuracy using the d+p -> 3He+eta reaction, the momentum of the circulating deuteron beam in the Cooler Synchrotron COSY of the Forschungszentrum Juelich 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 artificially induced spin resonance, it was possible to evaluate its momentum p with a precision of dp/p < 10-4 for a momentum of roughly 3 GeV/c. Different possible sources of error in the application of the spin resonance method are discussed in detail and its possible use during a standard experiment is considered.

10 pages, 6 figures, 2 tables, published version

References in corpus (1)

• Determination of target thickness and luminosity from beam energy losses

Cited by in corpus (6)

• New determination of the mass of the eta meson at COSY-ANKE
• Few-body aspects of the near threshold pseudoscalar meson production
• The Beauty of Spin
• Experimental and theoretical study of deuteron-proton elastic scattering for proton kinetic energies between $T_p=882.2\text{MeV}$ and $T_p=918.3\text{MeV}$
• Total and differential cross sections of the $\mathbf{dp}\to {}^3\text{He}\mathbf{\eta }$ reaction at excess energies between 1 and 15 MeV
• Meson-production experiments at COSY-Juelich