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

Koszorús, Á. ; Yang, X. F. ; Jiang, W. G. ; Novario, S. J. ; Bai, S. W. ; Billowes, J. ; Binnersley, C. L. ; Bissell, M. L. ; Cocolios, T. E. ; Cooper, B. S. ; de Groote, R. P. ; Ekström, A. ; Flanagan, K. T. ; Forssén, C. ; Franchoo, S. ; Ruiz, R. F. Garcia ; Gustafsson, F. P. ; Hagen, G. ; Jansen, G. R. ; Kanellakopoulos, A. ; Kortelainen, M. ; Nazarewicz, W. ; Neyens, G. ; Papenbrock, T. ; Reinhard, P.-G. ; Ricketts, C. M. ; Sahoo, B. K. ; Vernon, A. R. ; Wilkins, S. G.

Nature Phys, 2021-04, Vol.17 (4), p.439-443 [Periódico revisado por pares]

London: Nature Publishing Group

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Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of N = 32
Autor: Koszorús, Á. ; Yang, X. F. ; Jiang, W. G. ; Novario, S. J. ; Bai, S. W. ; Billowes, J. ; Binnersley, C. L. ; Bissell, M. L. ; Cocolios, T. E. ; Cooper, B. S. ; de Groote, R. P. ; Ekström, A. ; Flanagan, K. T. ; Forssén, C. ; Franchoo, S. ; Ruiz, R. F. Garcia ; Gustafsson, F. P. ; Hagen, G. ; Jansen, G. R. ; Kanellakopoulos, A. ; Kortelainen, M. ; Nazarewicz, W. ; Neyens, G. ; Papenbrock, T. ; Reinhard, P.-G. ; Ricketts, C. M. ; Sahoo, B. K. ; Vernon, A. R. ; Wilkins, S. G.
Assuntos: Beta decay ; Calcium ; Clusters ; Density functional theory ; experimental nuclear physics ; General Physics ; Ionization ; Isotopes ; Nuclear Experiment ; Nuclear matter ; NUCLEAR PHYSICS AND RADIATION PHYSICS ; Nuclear Theory ; Nucleons ; optical spectroscopy ; Physics ; Potassium ; Potassium isotopes ; theoretical nuclear physics
É parte de: Nature Phys, 2021-04, Vol.17 (4), p.439-443
Notas: STFC
USDOE Office of Science (SC), Nuclear Physics (NP)
National Natural Science Foundation of China (NSFC)
AC05-00OR22725; SC0021176; 00249237; FG02-96ER40963; SC0018223; 2018YFA0404403; 11875073; 648381; ST/L005794/1; ST/L005786/1; ST/P004423/1; ST/L002868/1; IG2012-5158
National Key Research and Development Program of China
EU Horizon
Descrição: Abstract 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 radii 4,5 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 52 K. 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.
Editor: London: Nature Publishing Group
Idioma: Inglês

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

London: Nature Publishing Group

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