Bestimmung der Hyperfeinstrukturaufspaltungen der Scandium-Grundzustände2D3/2 und2D5/2 und des Quadrupolmomentes des Sc45-Kernes
The hyperfine structure splittings of the electronic ground states2D3/2 and2D3/2 of the stable isotope Sc45 have been measured by the atomic beam magnetic resonance method. From these splittings the magnetic dipole and electric quadrupole interaction constants are found to bea3/2=(269,560±0,02) Mc/sb3/2=−(26,37±0,1) Mc/sa5/2=(109,034±0,01) Mc/sb5/2=−(37,31±0,1) Mc/s. The values of the electric quadrupole moment calculated fromb3/2 andb5/2 differ by about 5% indicating that the configuration 3d 4s2 of the ground states is perturbed by higher configurations.
Über das Kernmoment des Scandiums
ZusammenfassungAus der Hyperfeinstruktur zweier Sc I-Linien wurde das mechanische Moment des Scandiumkernes zu I=7/2 bestimmt. Das entsprechende magnetische Moment beträgt etwa 3,6 Kernmagnetonen.
The MR-TOF-MS isobar separator for the TITAN facility at TRIUMF
At TRIUMF’s Ion Trap for Atomic and Nuclear Science (TITAN) a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) will extend TITAN’s capabilities and facilitate mass measurements and in-trap decay spectroscopy of exotic nuclei that so far have not been possible due to strong isobaric contamination. This MR-TOF-MS will also enable mass measurements of very short-lived nuclides (half-life > 1 ms) that are produced in very low quantities (a few detected ions overall). In order to allow the installation of an MR-TOF-MS in the restricted space on the platform, on which the TITAN facility is located, novel mass spectrometric methods have been developed. Transport, cooling and distribution of the ions inside the device is done using a buffer gas-filled RFQ-based ion beam switchyard. Mass selection is achieved using a dynamic retrapping technique after time-of-flight analysis in an electrostatic isochronous reflector system. Only due to the combination of these novel methods the realization of an MR-TOF-MS based isobar separator at TITAN has become possible. The device has been built, commissioned off-line and is currently under installation at TITAN.