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The polarized negative light ion source at the Cooler Synchrotron COSY in Jülich is based on the colliding beams principle. Using an intense pulsed neutralized cesium beam for the charge exchange with a pulsed highly polarized hydrogen beam intensities of 50 μA have been achieved at the end of 2005. The steady improvement has lead to a gain of a factor of three in the total charge contained in one pulse, compared to the record value achieved in 2001. This report sums up the characteristics of the ion source and its components in their present mode of operation and describes the ongoing efforts for still higher beam intensities. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

The polarized ion source at the cooler synchrotron facility COSY of the research centre Jülich in Germany delivers negative polarized protons or deuterons for medium energy experiments. The polarized ion source, originally built by the universities of Bonn, Erlangen and Cologne, is based on the colliding beams principle, using after an upgrade procedure an intense pulsed neutralized caesium beam for charge exchange with a pulsed highly polarized hydrogen beam. The source is operated at 0.5 Hz repetition rate with 20 ms pulse length, which is the maximum useful length for the injection into the synchrotron. Routinely intensities of 20 μA are delivered for injection into the cyclotron of the COSY facility. For internal targets the intensity of 2 mA and a polarization up to 90% have been reached. Reliable long-term operation for experiments at COSY for up to 9 weeks has been achieved. Since 2003 polarized deuterons with different combinations of vector and tensor polarization were delivered to experiments. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

The importance of the isospin symmetry breaking in extracting various particle physics parameters is discussed. In particular the measurement of isospin symmetry breaking in the reaction pd→3Hπ+/3Heπ0 is presented. The energy dependence of the measured cross sections ratio indicate isospin symmetry breaking effects. Within a simple model based on π0-η meson mixing the mixing angle of these mesons is extracted. [ABSTRACT FROM AUTHOR]