Unexpectedly large charge radii of neutron-rich calcium isotopes

Garcia Ruiz, R. F.; Bissell, M. L.; Blaum, K.; Ekstrom, A.; Frommgen, N.; Hagen, G.; Hammen, M.; Hebeler, K.; Holt, J. D.; Jansen, G. R.; Kowalska, M.; Kreim, K.; Nazarewicz, W.; Neugart, R.; Neyens, G.; Nortershauser, W.; Papenbrock, T.; Papuga, J.; Schwenk, A.; Simonis, J.; Wendt, K. A.; Yordanov, D. T.

doi:10.1038/nphys3645

Title: Unexpectedly large charge radii of neutron-rich calcium isotopes

Journal Article · Mon Feb 08 00:00:00 EST 2016 · Nature Physics

DOI:https://doi.org/10.1038/nphys3645· OSTI ID:1376334

Garcia Ruiz, R. F. ^[1]; Bissell, M. L. ^[2]; Blaum, K. ^[3]; Ekstrom, A. ^[4]; Frommgen, N. ^[5]; Hagen, G. ^[6]; Hammen, M. ^[5]; Hebeler, K. ^[7];

^[8];

^[4]; Kowalska, M. ^[9]; Kreim, K. ^[3]; Nazarewicz, W. ^[10]; Neugart, R. ^[11]; Neyens, G. ^[1];

^[12]; Papenbrock, T. ^[4]; Papuga, J. ^[1]; Schwenk, A. ^[13]; Simonis, J. ^[7] more »

KU Leuven, Leuven (Belgium)
KU Leuven, Leuven (Belgium); The Univ. of Manchester, Manchester (United Kingdom)
Max-Planck-Institut fur Kernphysik, Heidelberg (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. Mainz, Mainz (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Technishe Univ. Darmstadt, Darmstadt (Germany); ExtreMe Matter Institute EMMI, Darmstadt (Germany)
TRIUMF, Vancouver, BC (Canada)
CERN, European Organization for Nuclear Research, Geneva (Switzerland)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Warsaw, Warsaw (Poland)
Max-Planck-Institut fur Kernphysik, Heidelberg (Germany); Univ. Mainz, Mainz (Germany)
Univ. Mainz, Mainz (Germany); Technishe Univ. Darmstadt, Darmstadt (Germany)
Max-Planck-Institut fur Kernphysik, Heidelberg (Germany); Technishe Univ. Darmstadt, Darmstadt (Germany); ExtreMe Matter Institute EMMI, Darmstadt (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States);Univ. of Tennessee, Knoxville, TN (United States)
Max-Planck-Institut fur Kernphysik, Heidelberg (Germany); Univ. Paris-Sud, Orday Cedex (France)

Here, despite being a complex many-body system, the atomic nucleus exhibits simple structures for certain ‘magic’ numbers of protons and neutrons. The calcium chain in particular is both unique and puzzling: evidence of doubly magic features are known in ^40,48Ca, and recently suggested in two radioactive isotopes, ^52,54Ca. Although many properties of experimentally known calcium isotopes have been successfully described by nuclear theory, it is still a challenge to predict the evolution of their charge radii. Here we present the first measurements of the charge radii of ^49,51,52Ca, obtained from laser spectroscopy experiments at ISOLDE, CERN. The experimental results are complemented by state-of-the-art theoretical calculations. The large and unexpected increase of the size of the neutron-rich calcium isotopes beyond N = 28 challenges the doubly magic nature of ⁵²Ca and opens new intriguing questions on the evolution of nuclear sizes away from stability, which are of importance for our understanding of neutron-rich atomic nuclei.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1376334

Journal Information:: Nature Physics, Vol. 12, Issue 6; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 235 works

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