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Joined 2026-09-21 Message
Incoming links: The Nobel Prize in Physics 1994 by Nobel Prize Outreach
Neutron scattering 2026-10-18
Neutron scattering measures how a specimen changes the directions and kinetic energies of incident neutrons. Neutron diffraction uses the elastic scattering pattern to investigate crystal structure and magnetic order; inelastic neutron scattering uses energy transfer to investigate excitations such as phonons and magnons. The two measurements ask complementary questions: what arrangement repeats in space, and what disturbances can propagate through it?
The 1994 Nobel Prize in Physics recognized Clifford Glenwood Shull's diffraction work and Bertram Neville Brockhouse's spectroscopy.[ref]
Nuclear scattering couples to atomic nuclei; magnetic scattering couples the neutron's magnetic moment to electronic magnetic moments. The latter underlies both magnetic neutron diffraction and magnon spectroscopy. An atomic number is not a nuclear neutron scattering weight: the relevant coefficient in the elementary coherent model is the nuclear neutron scattering length.
Nobel Prize in Physics in 1994 2026-10-18
For pioneering neutron scattering techniques for studying condensed matter, Bertram Neville Brockhouse received one half for developing neutron spectroscopy, while Clifford Glenwood Shull received one half for developing neutron diffraction.[ref]
The Nobel Prize in Physics 1994 by Nobel Prize Outreach. Individual official 1994 summary: equal halves; Brockhouse neutron spectroscopy and Shull neutron diffraction are distinct contributions.