Abstract
Charge radii of neutron deficient Sc40 and Sc41 nuclei were determined using collinear laser spectroscopy. With the new data, the chain of Sc charge radii extends below the neutron magic number N=20 and shows a pronounced kink, generally taken as a signature of a shell closure, but one notably absent in the neighboring Ca, K, and Ar isotopic chains. Theoretical models that explain the trend at N=20 for the Ca isotopes cannot reproduce this puzzling behavior.
| Original language | English |
|---|---|
| Article number | 102501 |
| Journal | Physical Review Letters |
| Volume | 131 |
| Issue number | 10 |
| DOIs | |
| State | Published - Sep 8 2023 |
Funding
We thank S. R. Stroberg for the imsrg ++ code used to perform VS-IMSRG calculations. This work was supported in part by the National Science Foundation, Grants No. PHY-15-65546 and No. PHY-21-11185; by the U.S. Department of Energy under Awards No. DE-SC0013365 (Office of Science), No. DE-SC0023175 (Office of Science, NUCLEI SciDAC-5 Collaboration), No. DE-FG02-96ER40963, No. DE-SC0018223, and under Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC (Oak Ridge National Laboratory), by NSERC under Grants No. SAPIN-2018-00027 and No. RGPAS-2018-52245, the Arthur B. McDonald Canadian Astroparticle Physics Research Institute, the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—Project-ID 279384907—SFB 1245, and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 101020842). TRIUMF receives funding via a contribution through the National Research Council of Canada. This project has received funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 861198-LISA-H2020-MSCA-ITN-2019. Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) program. This research used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under Award No. DE-AC05-00OR22725. VS-IMSRG computations were performed with an allocation of computing resources on Cedar at WestGrid and Compute Canada.