Münster 2002 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 4: Nuclear and Particle Astrophysics I
HK 4.3: Gruppenbericht
Montag, 11. März 2002, 17:15–17:45, C
A new precision measurement of the electric dipole moment of the neutron — •Reinhold Henneck — Paul-Scherrer-Institut, CH-5232 Villigen, Schweiz
At PSI we are presently setting up a new source for ultracold neutrons (UCN) which will deliver UCN densities in excess of 1000 UCN/cm3. This improvement of about 2 orders of magnitude over existing facilities will open new prospects for studies of fundamental properties of the neutron and its decay. As a first experiment we intend to improve the sensitivity in the measurement of the neutron electric dipole moment (EDM) to about 5 · 10−28e·cm. At this level Supersymmetry models predict a finite EDM value. The EDM spectrometer employs the conventional Ramsey method, but makes use of a system of 8 HV chambers and 5 chambers without HV, which will reduce the influence of systematic effects due to magnetic problems and leakage currents considerably.We shall discuss the principle of the experiment, the expected statistical uncertainty, systematic effects as well as details of the most important parts. In particular we shall focus on the problems which are connected with the magnetic field and which are being investigated in a separate Magnetic Test Experiment now.