ISOLDE Physics Group Meeting (PGM) and Seminar

Thursday 25 Sept 2025, 14:00 → 15:15 Europe/Zurich

508/1-001 (CERN)

14:00 → 14:10 General announcements

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

• Luis is traveling in the next 2 weeks
• E-mail was sent to isolde@cern.ch
  • Never register a device with  isolde@cern.ch!
  • Does someone know what this is, last operation in April 2024
• 
• Stairs will be installed mid-October, only to be used when approved
• Worksite supervisors course: will be organised once per month, expected huge demand
• Merge of seminar and the PGM indico

14:10 → 14:15 Safety announcements

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

14:15 → 14:20 Visits

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

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

Needed: 2 guides for a group of Finish teachers on Oct-9th at 10:30"

- Edward and Gulla

14:20 → 14:25 Physics of last week

Speaker: Hanne Heylen (CERN)

14:25 → 14:30 AOB

Speakers: Amy Sparks, 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 (CERN, Technische Universitaet Darmstadt (DE)), Victoria Vedia (CERN)

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

Title: Probing the doubly magic shell closure at 132Sn by Coulomb excitation of neutron-rich 130,134Sn isotopes

Speaker: Peter Reiter (University of Cologne, DE)

Abstract: Excited states of 130Sn, the even-even neighbour of doubly-magic 132Sn, were studied by safe Coulomb excitation using the highly efficient MINIBALL array. The 130Sn ions were accelerated to 4.4 MeV/u at the HIE-ISOLDE accelerator and collided with a 206Pb target. Deexciting 𝛾 rays from excited states were detected in coincidence with scattered particles. In addition to 𝛾 rays from the first 2+ state of 130Sn, deexcitation from higher-lying states was observed, attributed to an isomeric 130Sn 7− beam component. New 𝐵(𝐸2) values provide insights into the evolution of collectivity and nuclear structure around doubly-magic 132Sn. Recent theoretical results from state-of-the-art MCSM calcualtions differ strongly from previous measurements [1,2]. These calculations also indicate a transition from a slightly oblate to a prolate configuration of the first excited 2+ state across doubly magic 132Sn. The high statistics of the performed experiment allows for an experimental investigation of the 𝑄2+ value.

[1] D. Rosiak et al. Phys. Rev. Lett. 121, 252501 (2018)
[2] T. Togashi et al. Phys. Rev. Lett. 121, 062501 (2018)

Supported by the German BMBF 05P21PKCI1, 05P24PKCI1, 05P21RDCI2 and European Union*s Horizon Europe Frame- work research and innovation programme under grant agreement no. 101057511

Speakers: Carlotta Porzio (CERN), Hanne Heylen (CERN), Jessica Warbinek (CERN)