A nuclear drip line marks a boundary beyond which one- or few-nucleon emission becomes energetically allowed. One- and two-particle nuclear separation energies can give distinct boundaries because of nuclear pairing.
The term "nuclear drip line" refers to the boundaries in the map of nuclear stability that separate regions of nuclear existence and non-existence for isotopes of elements. Specifically, there are two main drip lines: 1. **Neutron Drip Line**: This boundary represents the limit where adding one more neutron to a nucleus makes it unstable and causes it to decay or break apart.
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