Concept for a neutron spectrometer based on optical detection of (3)He(n, p)-3H reactions in a gas

Physics

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Charged Particles, Elastic Scattering, Neutron Spectrometers, Optical Measurement, Energy Spectra, Kinetic Energy, Neutrons, Particle Collisions, Protons

Scientific paper

The conceptual framework is described for a new type of neutron spectrometer, based on the recently demonstrated principle of optical detection of charged-particle tracks in a gas. Whereas the elastic scattering of a neutron gives rise to the single track of a charged recoil particle, the reaction He-3(n,p)H-3 produces an event in which two tracks (those of the proton and triton) diverge from a common vertex at the capture site. The optical detection method, which allows direct visualization of tracks, could be used to distinguish between one- or two-pronged events. The measured total light output from an absorption event would be proportional to T(sub p) + T(sub t), the sum of the initial kinetic energies of the proton and triton. Independently of its incident direction, the energy of the absorbed neutron would be given by T = T(sub p) + T(sub t) - Q, where Q = 765 keV is the energy released by the reaction.

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