2–4 Dec 2015
CERN
Europe/Zurich timezone

Laser spectroscopy on Zn isotopes and isomers

3 Dec 2015, 14:25
15m
503/1-001 - Council Chamber (CERN)

503/1-001 - Council Chamber

CERN

162
Show room on map

Speaker

Xiaofei Yang (KU Leuven (BE))

Description

Laser spectroscopy measurements were performed on bunched beams of Zn ($Z$ = $30$) isotopes at ISOLDE-CERN using the ion cooler-buncher ISCOOL and the high-resolution collinear laser spectroscopy setup COLLAPS. The experimental measurements allowed to deduce the nuclear spins, magnetic moments and quadruple moments of odd-Zn isotopes and isomers up to $^{79}$Zn, as well as the mean square charge radii of $^{62-80}$Zn. These new results provide nuclear structure information on the Zn isotopic chain across the $N$ = $40$ sub-shell and up to the $N$ = $50$ shell closure. As the nuclear moments are a sensitive probe of the configuration of the wave function, the experimental results are compared to large scale shell model calculations using jj$44$b/JUN$45$ ($^{56}$Ni core and $pfg$ shell) [1,2] effective interactions and state-of-the-art shell-model calculations in a large model space ($pf$ for proton and $sdg$ for neutron) [3]. Shell evolution of $^{69-79}$Zn isotopes with increasing neutron occupation of the $\nu g_{9/2}$ orbit will be discussed based on the experimental measurements and the shell model calculations. The measured changes in mean-square charge radii along the Zn chain cover the $N$ = $40$ sub-shell and reached the $N$ = $50$ shell. This result will be presented to discuss the proposed sub-shell/shell closure at $N$ = $40$/$N$ = $50$ in the Ni region together with earlier measurements of Cu and Ga [4,5]. [1] M. Honma et al., Phys. Rev. C $\textbf{80}$, $064323$ ($2009$). [2] B.A. Brown and A.F. Lisetskiy (unpublished). [3] K. Sieja and F. Nowacki., Phys. Rev. C $\textbf{85}$, $051301$(R) ($2012$). [4] M.L. Bissell et al., to be submitted. [5] T. J. Procter et al., Phys. Rev. C $\textbf{86}$, $034329$ ($2012$).

Primary author

Xiaofei Yang (KU Leuven (BE))

Co-authors

Prof. Bradley Cheal (University of Liverpool) Calvin Wraith (University of Liverpool) Carla Babcock (University of Liverpool (GB)) Christian Gorges (TU Darmstadt) Deyan Yordanov (Max-Planck-Gesellschaft (DE)) Gerda Neyens (KU Leuven (BE)) Hanne Heylen (KU Leuven (BE)) Jasna Papuga (Katholieke Universiteit Leuven (BE)) Joerg Kraemer (TU Darmstadt) Kieran Flanagan (University of Manchester (GB)) Klaus Blaum (Max-Planck-Gesellschaft (DE)) Laura Katharina Grob (Technische Universitaet Darmstadt (DE)) Liang Xie (University of Manchester (GB)) Magdalena Kowalska (CERN) Mark Bissell (University of Manchester (GB)) Rainer Neugart (Johannes-Gutenberg-Universitaet Mainz) Dr Rodolfo Sanchez (GSI Helmholtzzentrum f\"{u}r Schwerionenforschung,) Ronald Fernando Garcia Ruiz (KU Leuven (BE)) Simon Kaufmann (TU Darmstadt) Stephan Malbrunot (CERN) Prof. Wilfried Nortershauser, (TU Darmstadt) Wouter Gins (KU Leuven) jonathan billowes (university of manchester)

Presentation materials