Date/Time: Thu Oct 16 2025 at 14:00<br/><br/>Location: Auditorium/ Hybrid<br/><br/>Speaker: Thomas Cocolios (KU Leuven)<br/><br/>Title: Getting NSHAPE: combining laser spectroscopy with muonic atoms of exotic nuclei to reveal exciting features of the nuclear landscape<br/><br/>Abstract: 14:00
Nuclear charge radii are known to be impactful to further our understanding of the nuclear landscape, from kinks at magic numbers to onset of deformation or the dramatic odd-even staggering in the neutron-deficient mercury isotopes. Recent developments at CERN ISOLDE, like the Perpendicularly-Illuminated Laser Ion Source & Trap (PI-LIST) has enabled the study of neutron-rich polonium and actinium isotopes, helping delineate the region of octupole deformation north-east of 208Pb.
While laser spectroscopy gives access to changes in charge radii across long chains of isotopes, those measurements rely on atomic parameters which determination from large-scale atomic calculations result in large systematic uncertainties, often obscuring the nuclear information. It is possible to benchmark those laser spectroscopy data against absolute charge radii, when those are available. However, given that none of the odd-Z elements nor any element beyond Pb have more than 2 stable isotopes, none of those have so far such data available.
At the Paul Scherrer Institute in Villigen, Switzerland, the muX collaboration has developed an approach to study muonic x rays for samples as small as 10 µg. This has enabled a new program, named ReferenceRadii, exploring absolute charge radii from aluminium to curium.
Recent highlights from PI-LIST and ReferenceRadii, and their impact will be presented.
------------------------
Join Zoom Meeting
https://uvic.zoom.us/j/84924533016?pwd=YzyVAkUoSYwZxvU7sML7dsSPyVq9Q9.1
Meeting ID: 849 2453 3016
Password: 733656<br/><br/>Refreshments available 15min before the colloquium. BYOM- Bring your own mug!<br/><br/>______________________________<br/><br/>Detailed information available can be found at <a href='https://www.triumf.ca/research-program/lectures-conferences/upcoming-seminars-lectures'>https://www.triumf.ca/research-program/lectures-conferences/upcoming-seminars-lectures</a> <br/><br/>Date/Time: Fri Oct 17 2025 at 11:00<br/><br/>Location: ISAC II Conf. Room<br/><br/>Speaker: Joao-Pedro Ramos (SCK CEN)<br/><br/>Title: Target and Ion source R&D activities for RIB production at the future ISOL@MYRRHA at SCK CEN<br/><br/>Abstract: ISOL@MYRRHA is currently undergoing prototyping, design, and construction as part of the MYRRHA Phase 1 programme at the Belgian Nuclear Research Centre, SCK CEN, in Mol, Belgium. This facility is a part of the MYRRHA programme, which is focused on the development of an Accelerator Driven System (ADS) intended to serve as a major research infrastructure.
In its current configuration, ISOL@MYRRHA is designed to receive a 100 MeV proton beam with an intensity of up to 500 µA on target (limited to 200 µA for actinide targets). Initially, however, lower beam currents will be employed. In this seminar the current status of the ISOL@MYRRHA design will be presented and selected R&D activities will be highlighted, namely on the surface ion source, target materials development and user yield prediction for the facility.
Zoom Link: https://ubc.zoom.us/j/66263432672?pwd=qRCkUtHANapawJA8DJVLwHnbYxF6Bo.1
<br/><br/>.<br/><br/>______________________________<br/><br/>Detailed information available can be found at <a href='https://www.triumf.ca/research-program/lectures-conferences/upcoming-seminars-lectures'>https://www.triumf.ca/research-program/lectures-conferences/upcoming-seminars-lectures</a> <br/><br/>Date/Time: Wed Oct 15 2025 at 14:30<br/><br/>Location: ISAC-II Conf. Room<br/><br/>Speaker: Dr. Wiktoria Wojtaczka (KU Leuven)<br/><br/>Title: Development of Terbium Fluoride Beams for Medical Applications<br/><br/>Abstract: 14:30
The production of radioactive ion beams of terbium is of growing interest for both fundamental nuclear-physics studies and nuclear-medicine applications. Four terbium isotopes, 149Tb, 152Tb, 155Tb and 161Tb, show particular promise for molecular imagining and targeted cancer therapies, enabling a true theragnostic approach. While reactor-produced 161Tb is currently evaluated in several clinical trials, the sustained production of the other isotopes remains a major challenge. Currently, Isotope Separation On-Line (ISOL) method is the only technique capable of producing samples of 149Tb, 152Tb and 155Tb with required radioisotopic purity. However, terbium?s low volatility and strong adsorption to tantalum hinder its direct extraction from irradiated targets. As a result, current strategies rely on indirect production via laser-ionised parents, which limits access to exotic terbium isotopes and constrains translation protocols for offline mass separation.
A promising way forward is molecular sideband extraction, which enables terbium to be extracted in the from of its more volatile compounds, particularly terbium fluoride. Systematic studies of terbium fluoride beams were performed at CERN-ISOLDE, using a tantalum target coupled to a FEBIAD ion source, with the injection of reactive tetrafluoro-methane (CF4) gas. The ion beam composition was investigated as a function of target, ion source, and gas injection conditions to optimise the terbium fluoride beam delivery. The extended isotopic chain between masses A=144-168 was explored, as well as other lanthanides in this mass range. Beam-composition identification and yield measurements were primarily conducted using the ISOLTRAP MR-ToF MS, complemented by offline gamma and alpha spectrometry.
The results establish a basis for optimizing terbium production and extending molecular extraction to other lanthanides. The understanding gained during these investigations will be crucial for future facilities such as ISOL@MYRRHA and TATOOS@PSI, paving the way to reliable supplies of Tb isotopes for preclinical and clinical nuclear medicine.
Zoom Link: https://ubc.zoom.us/j/61921699631?pwd=CZ36GOQkgSVuoKMxZESKtwe8OgOGol.1
<br/><br/>.<br/><br/>______________________________<br/><br/>Detailed information available can be found at <a href='https://www.triumf.ca/research-program/lectures-conferences/upcoming-seminars-lectures'>https://www.triumf.ca/research-program/lectures-conferences/upcoming-seminars-lectures</a> <br/><br/>