Seminars

Thursday, Jun 20 at 2:00 PM
1200 FRIB Laboratory
Erich Leistenschneider, University of British Columbia
State of the art mass spectrometry for nuclear science at TITAN

Abstract:  The atomic mass is a crucial property to understand the nature of nuclear forces, nuclear structure, fundamental symmetries, and astrophysical processes. The TITAN facility at TRIUMF has been successfully performing precision mass measurements of radioactive nuclei for over a decade. In a recent result, the emergence of nuclear shell effects in N=32 was studied in neutron-rich Ti and V isotopes. The very sensitive TITAN Multiple Reflection Time-of-Flight Mass Spectrometer enabled the mass measurements of ions of interest in highly contaminated ion samples. The results conclusively establish the existence of weak shell effects in titanium but no effect in vanadium, narrowing down the abrupt onset of this shell closure. As this experiment illustrates, mass spectrometry techniques have become more challenging as the availability of beams grows towards increasingly exotic species. They need to be faster for shorter lifetimes, more sensitive for lower intensities, higher resolving for larger contamination levels, and sufficiently precise for scientific interest. Recent developments at TITAN have been demonstrated or are being commissioned. Among them, upgrades in the TITAN's Penning Trap Mass Spectrometer will push the precision boundary towards the parts-per-billion level for species living as short as a few tens of milliseconds. In this seminar, I will discuss some of TITAN's recent measurements, aspects of the technical advances, and plans for future developments.

Wednesday, Jun 26 at 4:00 PM
1200 FRIB Laboratory
Jose Fernando Benlliure-Anaya, University of Santiago de Compostela
Residual nuclei production in fragmentation and fission reactions investigated in inverse kinematics

Abstract:  The nature of the final fragments produced in nuclear reactions has been widely used to obtain valuable information on the reaction mechanism, but also on the bulk or structural properties of the reacting nuclei. The understanding of the final yields is also of utmost importance in many applications such as radiotherapy, radioprotection or the beams delivered by radioactive beam facilities. In this talk I will present some of the results obtained during the last decade at GSI investigating the fragment yields produced in fragmentation and fission reactions using inverse kinematic reactions at relativistic energies. I will also address some future plans at GSI/FAIR.

Friday, Jun 28 at 10:00 AM
1200 FRIB Laboratory
Justin Lietz, NSCL Graduate Assistant
Computational developments for Ab Initio many-body theory

Abstract:  Committee: Morten Hjorth-Jensen (Chairperson), Alexei Bazavov, Scott Bogner, Alexandra Gade, Brian O’Shea. Thesis is on display in 1312 BPS bldg. and the NSCL atrium