Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 48: Nuclear and Particle Astrophysics IV

HK 48.7: Talk

Thursday, March 11, 2004, 18:00–18:15, F

Magnetometry and neutron EDM false effects — •Iouri Sobolev¹, Stefan Baessler², Werner Heil², Wolfgang Kilian³, Vinzenz Kirste², Herbert Rinneberg³, and Frank Seifert³ — ¹PNPI Gatchina — ²Institut fuer Physik , Universitaet Mainz — ³PTB Berlin

In the near future, the availability of powerful ultra-cold neutron ( UCN ) sources at different research centers ( LANL, PSI, FRM-II, ILL, ... )will significantly improve the measurement sensitivity to the neutron EDM over what is reported in literature ( < 6 x 10(-26) [ecm] ). In this context one may raise the question, whether false neutron EDM effects can be scaled down, too, while keeping up the principle layout of an EDM experiment based on magnetic resonance technique of rotating magnetic dipole moments in a magnetic field with an electric field superimposed. We report on sizable systematic effects, which enter in the presence of magnetic field gradients in combination with motional magnetic fields ( B = (E x v)/c ). As a result, a pulling of the Larmor frequency can be observed due to the generalization of the Bloch-Siegert shift which is linear in the electric field and thus cannot be distinguished from a true EDM effect. In connection with this the role of magnetometry will be of utmost importance.