Speaker
Description
Collinear resonance ionization spectroscopy of stable $^{64, 66, 67,68, 70}$ Zn isotopes
Y. C. Liu,$^1$ X. F. Yang,$^1$ S. W. Bai,$^1$ J. Reilly,$^2$ T. E. Cocolios,$^3$ K. T. Flanagan,$^{2,4}$ R. F. Garcia Ruiz,$^5$ F. P. Gustafsson,$^3$ J. G. Li,$^6$ M. X. Ma,$^6$ G. Neyens,$^{3,7}$ C. M. Ricketts,$^2$ A. R. Vernon,$^5$ Q. J. Wang,$^8$
$^1$ School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China;
$^2$ School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom;
$^3$ KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium;
$^4$ Photon Science Institute Alan Turing Building, University of Manchester, Manchester M13; 9PY, United Kingdom;
$^5$ Massachusetts Institute of Technology, Cambridge, MA 02139, USA;
$^6$ Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
$^7$ Experimental Physics Department, CERN, CH-1211 Geneva 23, Switzerland;
$^8$ School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
To study the exotic nuclear structure phenomenon in more neutron-rich isotopes beyond the neutron magic number N = 50 in the nickel mass region [1,2], experiment to measure the ground state properties of $^{81,82}$Zn isotopes has been proposed at ISOLDE-CERN by using the collinear resonance ionization spectroscopy (CRIS) setup [3]. Prior to the online experiment, offline measurements have been performed on the stable$^{64,66,67,68,70}$Zn isotopes at CRIS setup at ISOLDE. Several atomic transitions (4s4p $^3$P$_{0,1,2}$ – 4s5d $^3$D$_1$ /4s4p $^3$P$_{1,2}$ – 4s5d $^3$ D$_2$ /4s4p $^3$P$_2$ – 4s5d $^3$D$_3$ / 4s4p $^3$P$_{1,2}$ – 4s7s $^3$S$_1$) have been probed in this work, allowing to systematically extract their hyperfine structure parameters and isotope shifts. The experimental results show an unexpected abnormal isotope shift at the odd-A $^{67}$Zn isotope, which is particularly significant in atomic transitions involving the 4s5d $^3$D$_{1,2,3}$ states, and could possibly be attributed to the mixing of hyperfine levels. To have a full understanding of this experimentally observed abnormal phenomenon, further atomic theoretical calculations based on the second order perturbation using relativistic multiconfiguration Dirac–Hartree–Fock wavefunctions are ongoing [4].
In this presentation, the details of this offline experimental measurement, and the achieved atomic results (hyperfine structure parameters and isotope shifts) for all probed atomic transitions of stable $^{64-70}$ Zn, will be reported. Current progress on the atomic calculation will also be introduced.
Reference:
[1] R. Taniuchi, C. Santamaria, P. Doornenbal, et al. Nature 569 (2019), 53.
[2] G. Hagen, G. R. Jansen, and T. Papenbrock, Physical Review Letters 117, (2016), 172501.
[3] X. Yang, T. Cocolios, S. Geldhof, et al. CERN-INTC CERN-INTC-2020-064 (2020) INTC–P–579.
[4] J. Ekman, P. Jönsson, M. Godefroid, et al. Computer Physics Communications 235 (2019), 433–446.
