CERN Accelerating science

Article
Report number	arXiv:2102.01988
Title	Proton-neutron pairing correlations in the self-conjugate nucleus $^{42}$Sc
Author(s)	Koszorus, Agota (Liverpool U.) ; Vormawah, Liam (Liverpool U.) ; Beerwerth, Randolf (Helmholtz Inst., Jena) ; Bissell, Mark (Manchester U.) ; Campbell, Paul (Manchester U.) ; Cheal, Bradley (Liverpool U.) ; Devlin, Charlie (Liverpool U.) ; Eronen, Tommi (Jyvaskyla U.) ; Fritzsche, Stephan (Helmholtz Inst., Jena) ; Geldhof, Sarina (Jyvaskyla U. ; Leuven U.) ; Heylen, Hanne (Leuven U. ; CERN) ; Holt, Jason (TRIUMF ; McGill U.) ; Jokinen, Ari (Jyvaskyla U.) ; Kelly, Sam (Manchester U.) ; Moore, Iain (Jyvaskyla U.) ; Miyagi, Takayuki (TRIUMF) ; Rinta-Antila, Sami (Jyvaskyla U.) ; Voss, Annika (Jyvaskyla U.) ; Wraith, Calvin (Liverpool U.)
Publication	2021-08-10
Imprint	2021-02-03
Number of pages	6
In:	Phys. Lett. B 819 (2021) 136439
DOI	10.1016/j.physletb.2021.136439 (publication)
Subject category	nucl-ex ; Nuclear Physics - Experiment
Abstract	Collinear laser spectroscopy of the $N=Z=21$ self-conjugate nucleus $^{42}$Sc has been performed at the JYFL IGISOL IV facility in order to determine the change in nuclear mean-square charge radius between the $I^{\pi}=0^{+}$ ground state and the $I^{\pi}=7^{+}$ isomer via the measurement of the $^{42\mathrm{g},42\mathrm{m}}$Sc isomer shift. New multi-configurational Dirac-Fock calculations for the atomic mass shift and field shift factors have enabled a recalibration of the charge radii of the $^{42-46}$Sc isotopes which were measured previously. While consistent with the treatment of proton-neutron, proton-proton and neutron-neutron pairing on an equal footing, the reduction in size for the isomer is observed to be of a significantly larger magnitude than that expected from both shell model and ab-initio calculations.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2021-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³

Corresponding record in: Inspire