i. i.4. t he r egion a=100, n=60 n e u t r o n s pherical - like w ell d eformed neutron rich side...

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I. II.1 I NTRODUCTION : THE REGION AROUND A=100, N=60 Mass and charge-radii measurements: shape changes for the ground states at N = 60  Strong tool of investigation. Limits: Mo and Kr isotopic chains? NO onset of deformation for the ground states in Kr (Z = 36). Necessity to clarify the Kr case appeared  Coulomb excitation 94,96 Kr: Smooth appearance of deformation T HE NEUTRON CONTRIBUTION – M ASS AND CHARGE RADII MEASUREMENTS First clue of the onset of deformation Rb isotopic chain Important development of deformation, adding one proton compared to the Kr isotopic chain. S. Naimi et al., Phys. Rev. Lett. 105, (2010) ISOLDE W ORK S HOP 2014 S OTTY C HRISTOPHE 3 15 TH -17 TH D ECEMBER 2014 M. Albers et al., PRL 109, (2012)