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Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $N = 32$
The charge radii of potassium isotopes up to $^{52}$K are measured, and show no sign of magicity at 32 neutrons as previously suggested in calcium. The observations are interpreted with coupled cluster and density functional theory calculations.
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Lenguaje: | eng |
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2020
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1038/s41567-020-01136-5 https://dx.doi.org/10.1038/s41567-021-01192-5 http://cds.cern.ch/record/2748052 |
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| author | 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. Garcia Ruiz, R.F. Gustafsson, F.P. Hagen, G. Jansen, G.R. Kanellakopoulos, A. Kortelainen, M. Nazarewicz, W. Neyens, G. Papenbrock, T. Reinhard, P.G. Sahoo, B.K. Ricketts, C.M. Vernon, A.R. Wilkins, S.G. |
| author_facet | 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. Garcia Ruiz, R.F. Gustafsson, F.P. Hagen, G. Jansen, G.R. Kanellakopoulos, A. Kortelainen, M. Nazarewicz, W. Neyens, G. Papenbrock, T. Reinhard, P.G. Sahoo, B.K. Ricketts, C.M. Vernon, A.R. Wilkins, S.G. |
| author_sort | Koszorús, Á. |
| collection | CERN |
| description | The charge radii of potassium isotopes up to $^{52}$K are measured, and show no sign of magicity at 32 neutrons as previously suggested in calcium. The observations are interpreted with coupled cluster and density functional theory calculations. |
| id | cern-2748052 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2020 |
| record_format | invenio |
| spelling | cern-27480522022-04-01T13:48:08Zdoi:10.1038/s41567-020-01136-5doi:10.1038/s41567-021-01192-5http://cds.cern.ch/record/2748052engKoszorús, 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.Garcia Ruiz, R.F.Gustafsson, F.P.Hagen, G.Jansen, G.R.Kanellakopoulos, A.Kortelainen, M.Nazarewicz, W.Neyens, G.Papenbrock, T.Reinhard, P.G.Sahoo, B.K.Ricketts, C.M.Vernon, A.R.Wilkins, S.G.Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $N = 32$physics.atom-phOther Fields of Physicsnucl-thNuclear Physics - Theorynucl-exNuclear Physics - ExperimentThe charge radii of potassium isotopes up to $^{52}$K are measured, and show no sign of magicity at 32 neutrons as previously suggested in calcium. The observations are interpreted with coupled cluster and density functional theory calculations.Nuclear charge radii are sensitive probes of different aspects of the nucleon-nucleon interaction and the bulk properties of nuclear matter; thus, they provide a stringent test and challenge for nuclear theory. The calcium region has been of particular interest, as experimental evidence has suggested a new magic number at $N = 32$ [1-3], while 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 $\beta$-decay detection, we were able to extend the charge radii measurement of potassium ($Z =19$) isotopes up to the exotic $^{52}$K ($t_{1/2}$ = 110 ms), produced in minute quantities. Our work provides the first charge radii measurement beyond $N = 32$ in the region, revealing no signature of the magic character at this neutron number. The results are interpreted with two state-of-the-art nuclear theories. For the first time, a long sequence of isotopes could be calculated with coupled-cluster calculations based on newly developed nuclear interactions. The strong increase in the charge radii beyond $N = 28$ is not well captured by these calculations, but is well reproduced by Fayans nuclear density functional theory, which, however, overestimates the odd-even staggering effect. These findings highlight our limited understanding on the nuclear size of neutron-rich systems, and expose pressing problems that are present in some of the best current models of nuclear theory.arXiv:2012.01864oai:cds.cern.ch:27480522020-12-03 |
| spellingShingle | physics.atom-ph Other Fields of Physics nucl-th Nuclear Physics - Theory nucl-ex Nuclear Physics - Experiment 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. Garcia Ruiz, R.F. Gustafsson, F.P. Hagen, G. Jansen, G.R. Kanellakopoulos, A. Kortelainen, M. Nazarewicz, W. Neyens, G. Papenbrock, T. Reinhard, P.G. Sahoo, B.K. Ricketts, C.M. Vernon, A.R. Wilkins, S.G. Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $N = 32$ |
| title | Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $N = 32$ |
| title_full | Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $N = 32$ |
| title_fullStr | Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $N = 32$ |
| title_full_unstemmed | Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $N = 32$ |
| title_short | Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $N = 32$ |
| title_sort | charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $n = 32$ |
| topic | physics.atom-ph Other Fields of Physics nucl-th Nuclear Physics - Theory nucl-ex Nuclear Physics - Experiment |
| url | https://dx.doi.org/10.1038/s41567-020-01136-5 https://dx.doi.org/10.1038/s41567-021-01192-5 http://cds.cern.ch/record/2748052 |
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