Date/Time: Thu Aug 07 2025 at 10:00<br/><br/>Location: ISAC-II Conf. Room<br/><br/>Speaker: Mathieu Cavenaile (TRIUMF/St. Mary's University Halifax)<br/><br/>Title: Charge-breeding developments at CANREB<br/><br/>Abstract: The CANadian Rare isotope facility with Electron-Beam ion source (CANREB) is set to deliver rare isotope beams in high charge states to TRIUMF experiments. In the Electron Beam Ion Source (EBIS) ions are trapped and charge-bred by collisions with an electron beam. Ion confinement is maintained by a combination of an electrostatic field and the electron beam space-charge potential. Ions are released by lowering the trapping potential with a step function. The system is operated at a pulse repetition frequency up to 100 Hz.
Due to the short trap length, the extraction scheme produces pulses shorter than 10 µs with high instantaneous rates that can saturate detectors in experiments. This issue is exacerbated by isobaric contamination in neutron-rich beams of high interest.
The goal of this project is to increase the usability of the CANREB ion beam, focusing on two main improvements: a slow-extraction scheme to stretch the ion pulse and closed-shell charge breeding to reduce isobaric contamination. Pulse-stretching be done using a slowly varying voltage function to modify trap electrode potentials instead of a step function. Beam purity can be improved by optimizing the breeding time so that ions of interests and contaminants are primarily in different charge states when extracted. Simulations results and measurements regarding both these improvements will be discussed, including the 1.4 ms-long pulses that have been produced.
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Passcode: 918704<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 Aug 06 2025 at 13:00<br/><br/>Location: Boardroom<br/><br/>Speaker: Alex Gezerlis (U Guelph)<br/><br/>Title: Emulators and pairing in light and heavy nuclei<br/><br/>Abstract: Traditional pairing in nuclear systems is of the identical-particle kind (i.e., neutron-neutron or proton-proton). This is counter-intuitive, given that the neutron-proton interaction is stronger. In earlier work, we had hypothesized that such neutron-proton pairing may appear in heavy nuclei. In recent work we extended our formalism and carried out mean-field pairing studies in the presence of deformation. We found that neutron-proton pairing survives and should be experimentally accessible. Time permitting, I will also discuss other works, notably the consistent propagation of uncertainties in the fitting of the three-nucleon interaction.
<br/><br/>in MOB<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/>