High Quality Content by WIKIPEDIA articles! Understanding the structure of the atomic nucleus is one of the central challenges in nuclear physics. This article is written from a nuclear physics perspective; as such, it is suggested that a casual reader first read the main nuclear physics article. This is one of the first models of nuclear structure, proposed by Carl Friedrich von Weizsacker in 1935. It describes the nucleus as a classical fluid made up of neutrons and protons , with an internal repulsive electric force proportional to the number of protons. The quantum mechanical nature of these particles appears via the Pauli exclusion principle, which states that no two nucleons of the same kind can be at the same state. Thus the fluid is actually what is known as a fermi fluid. This simple model reproduces the main features of the binding energy of nuclei.

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