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Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of N = 32

Koszorús, Agota (author)
Katholieke Universiteit Leuven,University of Liverpool
Yang, X. F. (author)
Beijing University of Technology,Katholieke Universiteit Leuven
Jiang, Weiguang, 1989 (author)
Oak Ridge National Laboratory,Chalmers tekniska högskola,Chalmers University of Technology,University of Tennessee
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Novario, S. J. (author)
Oak Ridge National Laboratory,University of Tennessee
Bai, S. W. (author)
Beijing University of Technology
Billowes, J. (author)
University of Manchester
Binnersley, C. L. (author)
University of Manchester
Bissell, M. L. (author)
University of Manchester
Cocolios, T. E. (author)
Katholieke Universiteit Leuven
Cooper, B. S. (author)
University of Manchester
de Groote, R. P. (author)
Jyväskylän Yliopisto,University of Jyväskylä,Helsingin Yliopisto,University of Helsinki
Ekström, Andreas, 1980 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Flanagan, K. T. (author)
University of Manchester
Forssén, Christian, 1974 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Franchoo, S. (author)
Institut de Physique Nucleaire Orsay
Ruiz, R. F.Garcia (author)
Organisation européenne pour la recherche nucléaire (CERN),European Organization for Nuclear Research (CERN),Massachusetts Institute of Technology (MIT)
Gustafsson, F. P. (author)
Katholieke Universiteit Leuven
Hagen, G. (author)
Oak Ridge National Laboratory
Jansen, G. R. (author)
Oak Ridge National Laboratory
Kanellakopoulos, A. (author)
Katholieke Universiteit Leuven
Kortelainen, M. (author)
Jyväskylän Yliopisto,University of Jyväskylä,Helsingin Yliopisto,University of Helsinki
Nazarewicz, W. (author)
Michigan State University
Neyens, G. (author)
Katholieke Universiteit Leuven,Organisation européenne pour la recherche nucléaire (CERN),European Organization for Nuclear Research (CERN)
Papenbrock, T. (author)
Oak Ridge National Laboratory,University of Tennessee
Reinhard, P. G. (author)
Friedrich-Alexander-Universität Erlangen Nurnberg (FAU)
Ricketts, C. M. (author)
University of Manchester
Sahoo, B. K. (author)
Physical Research Laboratory
Vernon, A. R. (author)
Katholieke Universiteit Leuven,University of Manchester
Wilkins, S. G. (author)
Organisation européenne pour la recherche nucléaire (CERN),European Organization for Nuclear Research (CERN)
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 (creator_code:org_t)
2021-01-28
2021
English.
In: Nature Physics. - : Springer Science and Business Media LLC. - 1745-2481 .- 1745-2473. ; 17:4, s. 439-443
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Nuclear charge radii are sensitive probes of different aspects of the nucleon–nucleon interaction and the bulk properties of nuclear matter, providing a stringent test and challenge for nuclear theory. Experimental evidence suggested a new magic neutron number at N = 32 (refs. 1–3) in the calcium region, whereas the unexpectedly large increases in the charge radii4,5 open new questions about the evolution of nuclear size in neutron-rich systems. By combining the collinear resonance ionization spectroscopy method with β-decay detection, we were able to extend charge radii measurements of potassium isotopes beyond N = 32. Here we provide a charge radius measurement of 52K. It does not show a signature of magic behaviour at N = 32 in potassium. The results are interpreted with two state-of-the-art nuclear theories. The coupled cluster theory reproduces the odd–even variations in charge radii but not the notable increase beyond N = 28. This rise is well captured by Fayans nuclear density functional theory, which, however, overestimates the odd–even staggering effect in charge radii. These findings highlight our limited understanding of the nuclear size of neutron-rich systems, and expose problems that are present in some of the best current models of nuclear theory.

Subject headings

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Annan fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Other Physics Topics (hsv//eng)

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