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The boundaries of the Chart of Nuclides contain exotic isotopes that possessextreme proton-toneutron asymmetries. Here we report on strong evidence of 9N,one of the most exotic proton-rich isotopes where more than one half of itsconstitute nucleons are unbound. With seven protons and two neutrons, thisextremely proton-rich system would represent the first-known example of aground-state five-proton emitter. The invariant-mass spectrum of its decayproducts can be fit with two peaks whose energies are consistent with thetheoretical predictions of an open-quantum-system approach, however we cannotrule out the possibility that only a single resonance-like peak is present inthe spectrum.

Strong evidence for 9N and the limits of existence of atomic nuclei