The nucleus of a deuterium atom, consisting of a proton and a neutron.
- The wave functions of both the deuteron and the alpha particle are invariant under the interchange of up and down quarks but recall that the pion wave function is not.
- If the laser frequencies are high enough, the deuteron effectively feels the proton's force in all directions, and the repulsion cancels itself.
- Tritium was discovered by physicists Ernest Rutherford, M.L. Oliphant, and Paul Harteck, in 1934, when they bombarded deuterium (a hydrogen isotope with mass number 2) with high-energy deuterons (nuclei of deuterium atoms).
1930s: from Greek deuteros 'second', on the pattern of proton.
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