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  2. Atomic nucleus - Wikipedia

    en.wikipedia.org/wiki/Atomic_nucleus

    The atomic nucleus is the small, ... packing protons and neutrons in the nucleus gives approximately the same total size result as packing hard spheres of a constant ...

  3. Nuclear structure - Wikipedia

    en.wikipedia.org/wiki/Nuclear_structure

    The atomic nucleus is a quantum n-body system. The internal motion of nucleons within the nucleus is non-relativistic, and their behavior is governed by the Schrödinger equation . Nucleons are considered to be pointlike, without any internal structure.

  4. William Draper Harkins - Wikipedia

    en.wikipedia.org/wiki/William_Draper_Harkins

    [2] [3] Harkins researched the structure of the atomic nucleus and was the first to propose the principle of nuclear fusion, [4] [5] four years before Jean Baptiste Perrin published his theory in 1919-20. His findings enabled, among other things, the development of the H-bomb.

  5. Nuclear binding energy - Wikipedia

    en.wikipedia.org/wiki/Nuclear_binding_energy

    The mass of an atomic nucleus is less than the sum of the individual masses of the free constituent protons and neutrons. The difference in mass can be calculated by the Einstein equation, E = mc 2, where E is the nuclear binding energy, c is the speed of light, and m is the difference in mass. This 'missing mass' is known as the mass defect ...

  6. Magic number (physics) - Wikipedia

    en.wikipedia.org/wiki/Magic_number_(physics)

    In nuclear physics, a magic number is a number of nucleons (either protons or neutrons, separately) such that they are arranged into complete shells within the atomic nucleus. As a result, atomic nuclei with a "magic" number of protons or neutrons are much more stable than other nuclei.

  7. Shape of the atomic nucleus - Wikipedia

    en.wikipedia.org/wiki/Shape_of_the_atomic_nucleus

    The atomic nucleus is a bound system of protons and neutrons. The spatial extent and shape of the nucleus depend not only on the size and shape of discrete nucleons, but also on the distance between them (the inter-nucleon distance). (Other factors include spin, alignment, orbital motion, and the local nuclear environment (see EMC effect).)

  8. Nuclear shell model - Wikipedia

    en.wikipedia.org/wiki/Nuclear_shell_model

    The rules for the ordering of the nucleus shells are similar to Hund's Rules of the atomic shells, however, unlike its use in atomic physics, the completion of a shell is not signified by reaching the next n, as such the shell model cannot accurately predict the order of excited nuclei states, though it is very successful in predicting the ...

  9. Nucleon - Wikipedia

    en.wikipedia.org/wiki/Nucleon

    In physics and chemistry, a nucleon is either a proton or a neutron, considered in its role as a component of an atomic nucleus. The number of nucleons in a nucleus defines the atom's mass number (nucleon number). Until the 1960s, nucleons were thought to be elementary particles, not made up of smaller parts.