ISOLDE Workshop and Users meeting 2025

Session

Session 7

4 Dec 2025, 14:00

222/R-001 (CERN)

Conveners

Session 7

• Ulli Koester (Institut Laue-Langevin (FR))

47. Status of the SHiP experiment

Lesya Shchutska (EPFL - Ecole Polytechnique Federale Lausanne (CH))

04/12/2025, 14:00

Invited (In person)

The Search for Hidden Particles (SHiP) experiment targets searching for feebly interacting particles (FIPs) with extremely weak couplings to the known standard model particles. For this, it will exploit the high-intensity proton beam from CERN’s Super Proton Synchrotron (SPS) in beam-dump mode to produce FIPs, such as heavy neutral leptons (HNLs), dark photons, dark scalars, axion-like...

103. SPES progress and first beams

Tommaso Marchi (INFN - National Institute for Nuclear Physics)

04/12/2025, 14:25

Invited (In person)

59. Neutron capture studies at FIPPS

Dr Marek Stryjczyk (Institut Laue-Langevin (FR))

04/12/2025, 14:50

Submitted oral (In person)

Capture of thermal neutrons is a well-established experimental method to probe the structure of nuclei in the vicinity of the path of stability. This technique allows for population of excited states below the single-neutron separation energy and for studies of their properties via, for example, angular correlations or fast timing methods. However, the relatively large energy window that...

96. Nuclear structure of neutron-rich Ge isotopes

Pablo Gonzalez-Tarrio Vicente (Universidad Complutense (ES))

04/12/2025, 15:05

Submitted oral (In person)

Abstract

The region near $^{78}\mathrm{Ni}$ is crucial for nuclear structure studies, as it lies around a doubly-magic shell closure ($Z = 28$, $N = 50$), making it an ideal testing ground for shell evolution and the interplay between single-particle and collective effects. Currently, many experimental and theoretical efforts are dedicated to investigating this region of...

66. HISTARS: A High-Performance Detector for Nuclear Excited-State Lifetimes at HIE-ISOLDE

Nikita Bernier (Universidad Complutense (ES))

04/12/2025, 15:20

Submitted oral (In person)

To exploit the vast possibilities offered for research in nuclear structure, nuclear astrophysics and other fields at ISOLDE, the HIE-ISOLDE Timing Array for Reaction Studies (HISTARS) project aims at building a detection device for the measurement of lifetimes of excited states populated in reactions. Nuclear excited-state lifetimes are essential to have direct access to electromagnetic...

29. High-resolution laser spectroscopy of light gold isotopes at CRIS: investigation of the island of deformation and shape coexistence

Osama Ahmad (KU Leuven (BE))

04/12/2025, 15:35

Submitted oral (In person)

Since the discovery of large shape staggering in neutron-deficient mercury isotopes Z = 80 [1], the region around Z = 82 and N = 104 has been extensively studied using in-source laser spectroscopy, due to its intriguing nuclear structure phenomena [2-3]. Recent experiments have revealed substantial shape staggering in neighbouring bismuth isotopes Z = 83 starting at neutron number *N =...

97. Coulomb excitation in $^{185\mathrm{g,m}}$Hg - Shape coexistence in the neutron-deficient lead region

Hannah Kleis (University of Liverpool (GB))

Submitted oral (In person)

Shape coexistence in the neutron-deficient lead region around $N \approx 104$ has been discovered in different nuclei especially in the mercury isotopes, where a staggering effect was found between even- and odd-mass nuclei using charge radii measurements [1,2]. In addition the study of the even-even $^{182,184,186,188}$Hg isotopes via Coulomb excitation reactions showed a mixing of weakly...