The superconducting critical temperature and the critical current of Nb-tube processed Nb<sub>3</sub>Al multifilamentary wires irradiated at reactor ambient temperature have been measured as a function of neutron fluence up to 1.2×10
19n/cm
2 (E>0.1MeV). The critical temperature decreases monotonically with neutron fluence. The decreases of the critical temperature relative to their unirradiated values are about 9% and 34% for fluences of 3.9×10
18n/cmcm
2 and 1.2×10
19n/cmcm2, respectively. Neutron fluence dependence of the critical temperature for these Nb
3Al wires is found to be almost similar to that for Nb3Al bulk samples. On the other hand, the critical current in a magnetic field of 8T remains almost unchanged up to a fluence of 1.4 ×10
18n/cmcm
2 and then repidly decreases with increasing fluence. This peculiar dependence on neutron fluence of the critical current may be attributed to extremely small size of Nb
3Al filaments from the viewpoint of the flux pinning. The critical currents decrease monotonically with applied tensile strain for both unirradiated and irradiated samples. The rate of decrease in the critical current with strain for irradiated samples tends to be smaller than that for unirradiated samples.
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