ISOLDE Physics Group Meeting (PGM) and Seminar

Thursday 8 Oct 2026, 14:00 → 15:15 Europe/Zurich

508/1-001 (CERN)

14:00 → 14:10 General announcements

Newsletter, outreach
- EP newsletter: confirm contributions Ca radii

ISOLDE workshop
- Deadline for abstracts Sunday 11 October
- Programme to be put together quickly after deadline, by ??
- Please register, EP group members have fee covered for
- Dinner venue had to be changed
- Summary contribution can go the EP newsletter and also to CERN courier.

Students
- Projects for the 2027 Boston Students cohort requested, to be sent to Luis by 14 October

CERN matters
- DG townhall address today, "non-collider physics" not discussed, specific workshop

Budget and administration

Technical
- Compressed air during the end-of-the-year closure

General
- Projector - make it work with laptop again (what do we need, new cable, new project, ... ?)
- Upgrade TRAKA box
- Website: Phone numbers of rooms -> fixed phones + people update -> contact Jenny
- Nobel prize of physics

Speakers: Hanne Heylen (CERN), Prof. Luis M Fraile (CERN)

14:10 → 14:15 Overview of ISOLDE activities

https://isolde.web.cern.ch/isolde-hall-activities-ls3

14:15 → 14:20 Safety announcements

• RP contact e-group: rp-isolde-medicis@cern.ch

Speakers: Hanne Heylen (CERN), Prof. Luis M Fraile (CERN)

14:20 → 14:25 Visits

Rota to be found on: https://cernbox.cern.ch/s/qbqEUB41tAvAzWa

Luis requests extra visit by Electrical Accreditation course group tomorrow 9 October 14:00.

Speakers: Hanne Heylen (CERN), Victoria Vedia (CERN)

14:25 → 14:30 AOB

Speakers: Amy Sparks (Paul Scherrer Institute (CH)), Carlotta Porzio (CERN), Christoph Schweiger (Max Planck Society (DE)), Hanne Heylen (CERN), Jessica Warbinek (CERN), Juliana Schell (Institut Fur Materialwissenschaft Universität Duisburg-Essen (DE)), Liss Vazquez Rodriguez (Max Planck Society (DE)), Prof. Luis M Fraile (CERN), Magdalena Kowalska (CERN), Patrick MacGregor (CERN), Peter Plattner, Tim Enrico Lellinger (Max Planck Institute for Nuclear Physics), Victoria Vedia (CERN)

14:30 → 15:15 ISOLDE seminar or Physics presentation by local group

Title: First Collinear Laser Spectroscopy of $^{16}$O via Molecular Dissociation of CO$^{+}$
Speaker: Sonya Dutton, Max-Planck-Institut für Kernphysik
Abstract: Many light elements, such as oxygen, remain inaccessible to collinear laser spectroscopy (CLS) because of their high reactivity and tendency to be extracted in molecular form. Collision-induced dissociation offers a route to release these isotopes from molecular beams and make them accessible to CLS.

In this master's thesis, CO$^{+}$ molecules containing $^{16}$O were dissociated through collisions with helium gas to produce O$^{+}$ fragments, which were then neutralized by charge exchange with sodium and studied with laser spectroscopy. The resulting spectra had GHz-scale broadening associated with recoil from the molecular breakup process. The dependence of the fragment yield and resonance linewidth on helium pressure and beam energy was investigated to characterize the method. Lower collision energies and post-collision reacceleration were shown to reduce the linewidth. These results demonstrate that molecular dissociation is a promising route for extending CLS to reactive light species and identify breakup-induced broadening as the primary limitation for high-resolution spectroscopy.

Speakers: Annie Dolan, Carlotta Porzio (CERN), Hanne Heylen (CERN)