Shape coexistence and beta-delayed fission studies in the lead region at ISOLDE facilitated by laser-ionization technique

Andrei Andreyev (University of York, UK)

The ISOLDE Decay Station (IDS) [1] is one of the permanent experiments at CERN’s ISOLDE facility. The device aims to provide a versatile and flexible tool for low-energy studies of the wide range of radioactive beams available at the laboratory. The current system consists of a recently upgraded array of up to 15 Clover detectors surrounding a movable tape system. This core setup is augmented with ancillary detector arrays for charged particle (silicon, DSSDs, plastic scintillators), neutron (INDiE and OGS) and fast-timing (LaBr:Ce and plastic scintillators) measurements.

In this presentation, an overview of the setup will be given along with recent highlights from selected experiments in the neutron-deficient and neutron-rich lead region. In particular, a brief summary of the status of low-energy fission studies around 180Hg will be presented [2,3,4]. The recent nuclear structure and laser spectroscopy experiments on the neutron-rich Tl [5], Hg [6] and Po [7] isotopes will also be discussed.

References
[1] https://isolde-ids.web.cern.ch/
[2] A.N. Andreyev et al, Phys. Rev. Lett., 105, 252502 (2010).
[3] P. Morfouace et al, Nature 641, 339–344 (2025).
[4] C. Schmitt et al., Phys. Rev. Lett, 126, 132502 (2021)
[5]. Z.Yue, A.N. Andreyev et al, Phys. Lett. B849, 138452 (2024).
[6] A.N. Andreyev et al, ISOLDE proposal https://cds.cern.ch/record/2834590/files/INTC-I-244.pdf (2024)
[7] R. Lica, A.N. Andreyev et al, Phys. Rev. Lett.,  134, 052502 (2025)