Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 14: Structure and Dynamics of Nuclei IV
HK 14.1: Group Report
Tuesday, March 17, 2026, 16:15–16:45, AM 00.021
Collinear laser spectroscopy reveals signatures of triaxial deformation in neutron-rich Ru — •Kristian König for the ATLANTIS collaboration — TU Darmstadt
The region of refractory metals below tin exhibits a diverse spectrum of nuclear phenomena, i.e. quickly changing deformations and shape coexistence. Particularly, in the neutron-rich Ru isotopes, there are indications for triaxial ground state deformations. This was explored at a new collinear laser spectroscopy setup (ATLANTIS) installed at the low-energy branch of CARIBU at Argonne National Laboratory. There, a californium-252 fission source can uniquely produce sufficiently intense low-energy ion beams of neutron-rich isotopes in this part of the nuclear chart. Laser spectroscopy was performed in 96,98−102,104,106−114Ru and charge radii as well as electromagnetic moments were extracted. The findings are compared to the latest BSkG models, which are energy density functionals of the Skyrme type. These comparisons reveal clear signatures of triaxial ground states in the neutron-rich Ru isotopes.
This work was supported by DFG Project-Id 279384907-SFB 1245, BMBF 05P19RDFN1 and NSF Grant No. PHY-21-11185, and by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357, with resources of ANL’s ATLAS facility, an Office of Science User Facility.
Keywords: Collinear laser spectroscopy; Nuclear charge radius; Ruthenium; Triaxial deformation