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Hyperfine structure measurements of the neutron-deficient indium ($Z=49$) isotopes, approaching the heaviest self-conjugate doubly-magic nucleus $^{100}\mathrm{Sn}$, have been performed using collinear resonance ionization spectroscopy [1]. These measurements provide an important benchmark in the development of many-body methods, which are now able to predict properties around the $Z=N=50$ shell-closure [2,3].
States in previously measured odd-even In isotopes have shown a remarkably simple single-particle behaviour, whether this trend in the electromagnetic moments continues will give insight into the strength of the shell closure. Isomeric spin assignments in the odd-odd isotopes also help pin down the ordering of the neutron $d_{5/2}$ and $g_{7/2}$ orbits [4,5]. This first experimental determination of ground-state electromagnetic moments and changes in mean-square charge radii of neutron-deficient $^{101-103}\mathrm{In}$ will shed light on the evolution of nuclear structure around $^{100}\mathrm{Sn}$.
[1] K.T. Flanagan, et al., Phys. Rev. Lett. 111, 212501 (2013).
[2] T.D. Morris et al., Phys. Rev. Lett. 120, 152503 (2018).
[3] T. Togashi et al., Phys. Rev. Lett. 121, 062501 (2018).
[4] C. Vaman et al., Phys. Rev. Lett. 99, 162501 (2007).
[5] D. Seweryniak et al., Phys. Rev. Lett. 99, 022504 (2007).
