Evidence for a Change in the Nuclear Mass Surface with the Discovery of the Most Neutron-Rich Nuclei with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>17</mml:mn><mml:mo>≤</mml:mo><mml:mi>Z</mml:mi><mml:mo>≤</mml:mo><mml:mn>25</mml:mn></mml:math>

The results of measurements of the production of neutron-rich nuclei by the fragmentation of a $^{76}\mathrm{Ge}$ beam are presented. The cross sections were measured for a large range of nuclei including 15 new isotopes that are the most neutron-rich nuclides of the elements chlorine to manganese ($^{50}\mathrm{Cl}$, $^{53}\mathrm{Ar}$, $^{55,56}\mathrm{K}$, $^{57,58}\mathrm{Ca}$, $^{59,60,61}\mathrm{Sc}$, $^{62,63}\mathrm{Ti}$, $^{65,66}\mathrm{V}$, $^{68}\mathrm{Cr}$, $^{70}\mathrm{Mn}$). The enhanced cross sections of several new nuclei relative to a simple thermal evaporation framework, previously shown to describe similar production cross sections, indicates that nuclei in the region around $^{62}\mathrm{Ti}$ might be more stable than predicted by current mass models and could be an indication of a new island of inversion similar to that centered on $^{31}\mathrm{Na}$.

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