 Radius of outermost closed isobar

The term "radius of the outermost closed isobar" typically refers to a concept in nuclear physics, specifically in the context of nuclear stability and the mapping of isobars (nuclei with the same mass number but different proton and neutron numbers) on a plot. In general, the radius of an isobar can be influenced by the nuclear forces and the shell structure of the nucleons (protons and neutrons) within the nucleus.