The aim of this chapter is to understand howcertain combinations
of N neutrons and Z
protons form bound states and to understandthe masses, spins and
parities of those states.A nother aim of this chapter is to
understandwhy certain nuclei are stable against thesedecays and
what determines the dominantdecay modes of unstable nuclei.
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The black squares are long-lived nucleipresent on Earth. Unbound
combinationsof ( N,Z) lie outside the lines marked last
