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HK: Physik der Hadronen und Kerne
HK 4: Nuclear and Particle Astrophysics I
HK 4.2: Gruppenbericht
Montag, 11. März 2002, 16:45–17:15, C
KATRIN a next generation neutrino mass experiment — •Jochen Bonn — B: Institut für Physik Universität Mainz
Neutrino masses are of crucial importance for nuclear and particle physics as well as for cosmology. Our present knowledge is based on neutrino oscillation experiments and on the investigation of weak decays.
The convincing evidence for neutrino oscillations found in the detection of solar and atmospheric neutrinos are a clear indication for differences in the squares of the neutrino masses but they do not allow to determine the masses themselves. To set the mass scale, direct mass measurements like e.g. the investigation of tritium β-decay are needed. The sensitivity limit of the presently running experiments in Mainz and Troitsk of about 2 eV/c2 are not sufficient to distinguish between alternative theoretical models asking for very light neutrinos or degenerated neutrinos with cosmologically relevant masses up to about 1 eV/c2.
The new KArlsruhe TRItium Neutrino mass experiment, KATRIN is presently designed and experiments in preparation of KATRIN are carried out. The sensitivity limit of KATRIN shall be in the sub eV range. The results of the present neutrino mass experiments will be briefly reported and the status of KATRIN will be discussed.
Experiments in preparation of KATRIN are sponsored by BMBF under contract Nr. 05CK1UM1/5 and 05CK1VK1/7.