학술논문
Proton-neutron pairing correlations in the self-conjugate nucleus $^{42}$Sc
Document Type
Working Paper
Author
Koszorus, Agota; Vormawah, Liam; Beerwerth, Randolf; Bissell, Mark; Campbell, Paul; Cheal, Bradley; Devlin, Charlie; Eronen, Tommi; Fritzsche, Stephan; Geldhof, Sarina; Heylen, Hanne; Holt, Jason; Jokinen, Ari; Kelly, Sam; Moore, Iain; Miyagi, Takayuki; Rinta-Antila, Sami; Voss, Annika; Wraith, Calvin
Source
Phys. Lett. B 819, 136439 (2021)
Subject
Language
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.