[Triumf-seminars] TRIUMF Nuclear Physics Seminar today at 15:30

TRIUMF Seminars triumf-seminars at lists.triumf.ca
Mon May 1 05:00:01 PDT 2017


Date/Time: Mon 2017-05-01 at 15:30

Location:  Auditorium          

Speaker:   Andrea Teigelhoefer (University of Manitoba)

Title:     In-Source Laser-Resonance-Ionization-Spectroscopy

Abstract: In many cases  radioactive ion beams (RIB) with high intensity and purity are required.  A good choice to achieve this is to use a resonant ionization laser ion sources (RILIS) to produce such beams. These RILIS ion sources take advantage of the unique spectroscopic fingerprint of an element, and therefore ionize element selectively, resulting in principle in isobar free RIB. For heavy elements the laser wavelengths required for efficient laser resonance ionization are not only element dependent, but also to some degree isotope dependent. This can lead to isotope selectivity and at times even isomer selectivity.


  In view of this, the optical isotope shift and hyperfine structure for actinium, silver and astatine were studied by combining in-source resonant ionization spectroscopy in combination with radioactive decay detection at the ISAC-yield station. This technique has the advantage, that despite the Doppler limited resolution, it is ultra-sensitive and the atomic spectrum for the nuclear ground and isomeric states can be investigated individually. I will demonstrate on the example of silver how the different hyperfine structures can be used for additional isomeric purification. For astatine and actinium, the main interest is to measure and study the optical isotope shift, in order to extrapolate the required wavelengths for the extreme neutron rich isotopes with low productions rates, that are requested by the experiments.




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