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Shape Coexistence in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ni</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>78</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> as the Portal to the Fifth Island of Inversion
Large-scale shell-model calculations predict that the region of deformation which comprises the heaviest chromium and iron isotopes at and beyond $N=40$ will merge with a new one at $N=50$ in an astonishing parallel to the $N=20$ and $N=28$ case in the neon and magnesium isotopes. We propose a valence space …