Nuclear Shell

Nuclear Shell

 

According to the shell model of the nucleus, each nucleon in the nucleus is in a certain quantum state, and no more than (2j + 1) nucleons (j is the spin of the nucleon) that form a nuclear shell can be in each state with a given energy (on an energy level). Nuclei in which the nucleonic shells are completely filled are called magic nuclei. (For more details, see and MAGIC NUMBER NUCLEI.)

References in periodicals archive ?
Nuclear shell structure is also known to change with the number of protons and neutrons.
Based on presentations at the 15th National Conference on Nuclear Structure in China (NSC2014), held in October 2014 in Guilin, China, the 45 papers in this volume (contributed by an international group of physicists) address topics related to nuclear spectroscopy of high-spin states, nuclear mass and half-life, nuclear astrophysics, super-heavy nuclei, unstable nuclei, mean field theory, neutron star and symmetry energy, nuclear matter, nuclear shell model, and other topics related to nuclear structure.
In the nuclear shell model, successive levels alternate in parity, and so parity eigenstates are linear combinations of either even (|nh[omega]>, n even) or odd (|nh[omega]>, n odd) shell states.
The magnetic shell density is narrower and weaker than the nuclear shell density.
The Brightsen model builds on the early cluster models of the Resonating Group Structure of John Wheeler [2] and the Linus Pauling Close-Packed Spheron Model [3], which predict mathematically that the wave function of a composite nucleus can be viewed quantum mechanically as a combination of partial wave functions that correspond to the multiple ways nucleons (protons, neutrons) can be distributed into close-packed clusters, thus rejecting the standard model Hartree-Fock formalism of average field interactions between independent nucleons in nuclear shells.
We had planned specific locations where we would set up our guns to blast the Soviet tanks with nuclear shells as they came through the gap.
The German-born American physicist Maria Goeppert-Mayer (1906-1972) tried to work out the nature of the nuclear shells from the nuclear properties that had been observed for different atoms.
Black programs also include 155 mm nuclear shells, a host of covert special operations units, the neutron bomb, the advanced cruise missible, and gadgetry to make submarines quieter.

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