Lead-208 has an intriguing nucleus. It is neutron rich, containing 82 protons and 126 neutrons. One of its more interesting properties is its structure: its center is composed of both protons and neutrons, but at its edge, there is a diffuse shell of mostly neutrons. Scientists call this the neutron "skin."
from General Physics News - Science News, Physics News, Physics, Material Sciences, Science https://ift.tt/nsYOZmp
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