Very accurate mass measurements of exotic nuclides - is the Standard model concerned?

by Frank Herfurth (CERN-EP)

Monday 28 Jan 2002, 16:30 → 17:30 Europe/Zurich

500/1-001 - Main Auditorium (CERN)

The weak force manifests itself in nuclear physics through nuclear beta decay. Under the condition that the exotic nucleus is well enough known it supplies an easy-to-access laboratory for investigation of the weak interaction. The mass is beside the half-life and decay mode one of the gross properties that characterise this laboratory. Direct mass measurement techniques that are based on a frequency determination yield relative uncertainties as small as 10 ppb and are applicable to nuclides with half-lives as short as 50 ms. Hence, even very exotic nuclei can be investigated with the necessary accuracy for tests of the Standard model of weak interaction. These are the CVC hypothesis and the unitarity of the CKM matrix along with the quest for scalar currents. The techniques will be presented and as examples mass measurements of 32,33,34 Ar, 74 Rb and 74 Kr will be discussed.

Organiser(s): Ariane Frey / EP Division

Note: Tea & coffee will be served at 16.00 hrs.