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Abstract
Elastic and inelastic neutron-diffraction measurements have been made on a single crystal of ${\mathrm{V}}_{3}$Si as a function of fast-neutron irradiation. After irradiation to a fluence of 22.2\ifmmode\times\else\texttimes\fi{}${10}^{18}$ n/${\mathrm{cm}}^{2}$ ($Eg1$ MeV), refinement of the Bragg intensity data reveals a slight decrease in the long-range-order parameter to a value of about 0.9, and an increase in the average value of the mean-square displacement $〈{u}^{2}〉$ at low temperature of about 0.001 ${\mathrm{\AA{}}}^{2}$. Inelastic-scattering measurements show that the softening of the transverse-acoustical mode associated with the martensitic transition is absent in the irradiated crystal.
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