On-line high precision mass measurements of rare isotopes using highly charged ions
Friday, 05 Apr. 2013, 15:30 - 16:30
Presenter: Martin SIMON - TRIUMF, TITAN, Canada National Laboratory for Particle and Nuclear Physics, Vancouver
Where: Lecture Hall, ATI, Stadionallee 2, 1020 Wien
Precise knowledge of the masses of stable and radioactive nuclei is of importance in various field of physics from stellar nucleosynthesis to neutrino physics and also fundamental tests of the standard model. TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN) at the rare beam facility ISAC in Vancouver is currently the only operational Penning trap mass spectrometer where short‐lived isotopes are charge bred in an electron beam ion trap in order to increase the precision of mass measurements. High efficiencies and short charge breeding times are crucial in order to maintain this precision boost. The principles of Penning trap mass spectrometry will be introduced with a special focus on the challenges and opportunities arising from the use of radioactive nuclides in high charge states. The most convincing results will be discussed, namely the mass measurement of the superallowed beta‐emitter 74Rb with a half life of 65ms, which contributes to the unitarity test of the quark‐mixing matrix, and the Q‐value measurement of 71Ga‐71Ge, which is of particular interest in solar neutrino physics since gallium was the detector material of the GALLEX and SAGE experiments.