Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.74: Poster

Thursday, March 19, 2009, 14:00–16:00, Audi-Max

Towards high-precision polarimetry for an EDM search on the deuteron — •Marlene da Silva e Silva, Klaus Jungmann, Wilbert Kruithof, Gerco Onderwater, Oscar Versolato, Hans Wilschut, and Lorenz Wilmann — KVI and University of Groningen, Groningen, The Netherlands

A finite Electric Dipole Moment (EDM) in any fundamental system would constitute a signal for New Physics. The deuteron presents itself as an optimal candidate due to its high sensitivity for CP odd parts of nuclear forces, together with being easily polarizable and having a small anomalous magnetic moment. A new storage ring technique is being developed, for which a small change in the vertical polarization would be a signal of a non-zero EDM. A novel polarimeter concept is under investigation. Besides being highly efficient, this polarimeter allows for continuous monitoring of the beam polarization, guaranteeing optimal sensitivity. Detailed studies on systematic error control, in addition to the measurement of cross sections and analyzing powers, were carried out at KVI-Groningen. Efficiency measurements were conducted at COSY-Jülich yielding a high efficiency up to 1.5%. The (statistics limited) ability to track changes in polarization at the level of a few hundred parts-per-million has been demonstrated. Further studies and developments to meet the final goal of sub-part-per-million sensitivity are in progress.