Seminarium Fizyki Jądra Atomowego
sala 1.01, ul. Pasteura 5
2026-03-26 (10:15) 
prof. Thomas Elias Cocolios (KU Leuven, Belgia)
Getting NSHAPE: combining laser spectroscopy with muonic atoms of exotic nuclei to reveal exciting features of the nuclear landscape
Nuclear charge radii are known to be impactful to further our understanding of the nuclear landscape, from kinks at magic numbers to onset of deformation or the dramatic odd-even staggering in the neutron-deficient mercury isotopes. Recent developments at CERN ISOLDE, like the Perpendicularly-Illuminated Laser Ion Source & Trap (PI-LIST) has enabled the study of neutron-rich polonium and actinium isotopes, helping delineate the region of octupole deformation north-east of 208Pb.
While laser spectroscopy gives access to changes in charge radii across long chains of isotopes, those measurements rely on atomic parameters which determination from large-scale atomic calculations result in large systematic uncertainties, often obscuring the nuclear information. It is possible to benchmark those laser spectroscopy data against absolute charge radii, when those are available. However, given that none of the odd-Z elements nor any element beyond Pb have more than 2 stable isotopes, none of those have so far such data available.
At the Paul Scherrer Institute in Villigen, Switzerland, the muX collaboration has developed an approach to study muonic x rays for samples as small as 10 µg. This has enabled a new program, named ReferenceRadii, exploring absolute charge radii from aluminium to curium.
Recent highlights from PI-LIST and ReferenceRadii, and their impact will be presented.
While laser spectroscopy gives access to changes in charge radii across long chains of isotopes, those measurements rely on atomic parameters which determination from large-scale atomic calculations result in large systematic uncertainties, often obscuring the nuclear information. It is possible to benchmark those laser spectroscopy data against absolute charge radii, when those are available. However, given that none of the odd-Z elements nor any element beyond Pb have more than 2 stable isotopes, none of those have so far such data available.
At the Paul Scherrer Institute in Villigen, Switzerland, the muX collaboration has developed an approach to study muonic x rays for samples as small as 10 µg. This has enabled a new program, named ReferenceRadii, exploring absolute charge radii from aluminium to curium.
Recent highlights from PI-LIST and ReferenceRadii, and their impact will be presented.