A. E. Barzakh | TrappedIons.org

Charge radii, moments and masses of mercury isotopes across the N = 126 shell closure

T. Day Goodacre [1,2,3,4,5], A. V. Afanasjev, A. E. Barzakh, L. Nies [2,6], B. A. Marsh, S. Sels [2,7,4], U. C. Perera, P. Ring [8], F. Wienholtz [2,6,9,10], A. N. Andreyev, P. Van Duppen [7,1,11], N. A. Althubiti, B. Andel [7,12], D. Atanasov [13,3], R. S. Augusto, J. Billowes [1], K. Blaum [13,1,7,9,5,2,14,15], T. E. Cocolios, J. G. Cubiss, G. J. Farooq-Smith, D. V. Fedorov, V. N. Fedosseev, K. T. Flanagan, L. P. Gaffney, L. Ghys [7,16], A. Gottberg [3,17], M. Huyse [7], S. Kreim [13,2], P. Kunz [3,18], D. Lunney [19,1,2], K. M. Lynch, V. Manea [13], Y. Martinez Palenzuela [7,2,5], T. M. Medonca, P. L. Molkanov, M. Mougeot [2], J. P. Ramos, M. Rosenbusch [6,2,20], R. E. Rossel, S. Rothe [2], L. Schweikhard [6,5], M. D. Seliverstov, P. Spagnoletti [15], C. Van Beveren [7], M. Veinhard [2], E. Verstraelen [7], A. Welker [2,21], K. Wendt [20,13,6], R. N. Wolf, A. Zadvornaya [7], K. Zuber [21]

Abstract

Combining laser spectroscopy in a Versatile Arc Discharge and Laser Ion Source, with Penning-trap mass spectrometry at the CERN-ISOLDE facility, this work reports on mean-square charge radii of neutron-rich mercury isotopes across the $N = 126$ shell closure, the electromagnetic moments of $^{207}$Hg and more precise mass values of $^{206-208}$Hg. The odd-even staggering (OES) of the mean square charge radii and the kink at $N = 126$ are analyzed within the framework of covariant density functional theory (CDFT), with comparisons between different functionals to investigate the dependence of the results on the underlying single-particle structure. The observed features are defined predominantly in the particle-hole channel in CDFT, since both are present in the calculations without pairing. However, the magnitude of the kink is still affected by the occupation of the $1i_{11/2}$ and $2g_{9/2}$ orbitals with a dependence on the relative energies as well as pairing.