2-7 June 2019
Simon Fraser University
America/Vancouver timezone
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Evolution of the N=82 Neutron-Deficient Shell Closure and Pushing Toward the Proton Drip-Line at TITAN

Jun 3, 2019, 12:00 PM
HC 114 (Simon Fraser University)

HC 114

Simon Fraser University

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle) Nuclear Physics / Physique nucléaire (DNP-DPN) M1-5 Nuclear Astrophysics (DNP) | Astrophysique nucléaire (DPN)


Brian Kootte


In the region where the expected N=82 shell closure approaches the proton drip-line, we are confronted with our poor knowledge of the nuclear binding energies. Precision experimental data is critical if we are to gain an understanding of how this neutron shell evolves for the heaviest N=82 isotones. The binding energies of neutron deficient nuclei can also reveal the exact location of the proton drip-line. However, the current lack of precision mass measurements in this region makes these nuclei stand out as a clear target for mass spectrometry studies, which allow for the determination of these binding energies. Furthermore, masses in this region can provide an anchor for chains of alpha decays whose origins extend up to A$\approx$170, and for which only relative masses are presently known.

The Isotope Separator and ACcelerator (ISAC) facility at TRIUMF produces intense beams of exotic isotopes for nuclear science. I will present the results of a series of atomic mass measurements of neutron-deficient Yb and Tm isotopes around the N=82 shell closure. Several of these masses were measured directly for the first time. These measurements were carried out using the recently commissioned Multiple Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS) at TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN). The results enable us to reduce the uncertainty in the nuclear binding energies, thus pushing towards the proton drip-line and providing new insight into the behaviour of the N=82 shell closure far from stability.

Primary author

Brian Kootte


C. Andreiou (Department of Physics, Simon Fraser University, Burnaby, British Columbia) Mr Soenke Beck (University of Giessen/GSI) Thomas Brunner (McGill University) Jens Dilling (triumf/UBC) Iris Dillmann ELEANOR DUNLING (TRIUMF) Jake Flowerdew (University of Calgary) Dr Leigh Graham (TRIUMF) Gerald Gwinner (University of Manitoba) A. Jacobs (TRIUMF) Mr Renee Klawitter (Max-Planck-Institut fur Kernphysik, Heidelberg D-69117, Germany) Yang Lan (TRIUMF) Erich Leistenschneider (TRIUMF) M. Lykiardopoulou (TRIUMF) Mr Victor Monier (University of York) Ish Mukul (TRIUMF) Stefan Paul (TRIUMF) Dr Moritz Pascal Reiter (University of Giessen/TRIUMF) Prof. Robert Thompson (University of Calgary, Canada) J.L. Tracy, Jr. (TRIUMF) Mr Mike Vansteenkiste (Waterloo/TRIUMF) Michael Wieser (University of Calgary) Mr Christian Will (University of Giessen) Anna Kwiatkowski (TRIUMF)

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