We present the first laser spectroscopic measurement of the neutron-rich nucleus 68Ni at the N = 40 subshell closure and extract its nuclear charge radius. Since this is the only short-lived isotope for which the dipole polarizability $$α$$D has been measured, the combination of these observables provides a benchmark for nuclear structure theory. We compare them to novel coupled-cluster calculations based on different chiral two- and three-nucleon interactions, for which a strong correlation between the charge radius and dipole polarizability is observed, similar to the stable nucleus 48Ca. Three-particle–three-hole correlations in coupled-cluster theory substantially improve the description of the experimental data, which allows to constrain the neutron radius and neutron skin of 68Ni.
Kaufmann, S., et al. "Charge Radius of the Short-Lived <math display='inline'><mrow><mmultiscripts><mrow><mi>Ni</mi></mrow><mprescripts/><none/><mrow><mn>68</mn></mrow></mmultiscripts></mrow></math> and Correlation with the Dipole Polarizability." Physical Review Letters, vol. 124, no. 13, Apr. 2020. https://doi.org/10.1103/PhysRevLett.124.132502
Kaufmann, S., Simonis, J., Bacca, S., Billowes, J., Bissell, M. L., Blaum, K., Cheal, B., Ruiz, R. F. Garcia, Gins, W., Gorges, C., Hagen, G., Heylen, H., Kanellakopoulos, A., Malbrunot-Ettenauer, S., Miorelli, M., Neugart, R., Neyens, G., Nörtershäuser, W., ... Yordanov, D. T. (2020). Charge Radius of the Short-Lived <math display='inline'><mrow><mmultiscripts><mrow><mi>Ni</mi></mrow><mprescripts/><none/><mrow><mn>68</mn></mrow></mmultiscripts></mrow></math> and Correlation with the Dipole Polarizability. Physical Review Letters, 124(13). https://doi.org/10.1103/PhysRevLett.124.132502
Kaufmann, S., Simonis, J., Bacca, S., et al., "Charge Radius of the Short-Lived <math display='inline'><mrow><mmultiscripts><mrow><mi>Ni</mi></mrow><mprescripts/><none/><mrow><mn>68</mn></mrow></mmultiscripts></mrow></math> and Correlation with the Dipole Polarizability," Physical Review Letters 124, no. 13 (2020), https://doi.org/10.1103/PhysRevLett.124.132502
@article{osti_1607964,
author = {Kaufmann, S. and Simonis, J. and Bacca, S. and Billowes, J. and Bissell, M. L. and Blaum, K. and Cheal, B. and Ruiz, R. F. Garcia and Gins, W. and Gorges, C. and others},
title = {Charge Radius of the Short-Lived <math display='inline'><mrow><mmultiscripts><mrow><mi>Ni</mi></mrow><mprescripts/><none/><mrow><mn>68</mn></mrow></mmultiscripts></mrow></math> and Correlation with the Dipole Polarizability},
annote = {We present the first laser spectroscopic measurement of the neutron-rich nucleus 68Ni at the N = 40 subshell closure and extract its nuclear charge radius. Since this is the only short-lived isotope for which the dipole polarizability $α$D has been measured, the combination of these observables provides a benchmark for nuclear structure theory. We compare them to novel coupled-cluster calculations based on different chiral two- and three-nucleon interactions, for which a strong correlation between the charge radius and dipole polarizability is observed, similar to the stable nucleus 48Ca. Three-particle–three-hole correlations in coupled-cluster theory substantially improve the description of the experimental data, which allows to constrain the neutron radius and neutron skin of 68Ni.},
doi = {10.1103/PhysRevLett.124.132502},
url = {https://www.osti.gov/biblio/1607964},
journal = {Physical Review Letters},
issn = {ISSN PRLTAO},
number = {13},
volume = {124},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2020},
month = {04}}
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