Abstract
Specimens of single-core wires of Nb 3 (SnGa) have been neutron irradiated at \sim100\deg C to fluences of 2.6 × 1019n/cm2(E>1.0 MeV). Measurements of I c at 4.2 K in transverse magnetic fields to 22 T, and measurements of T c were made. The interest in this material (∼ 1 at.%Ga in the Nb 3 Sn layer made by the bronze process) stems from the greater critical-properties' values (T c =17.4K, H_{c2}\sim22.5 T) relative to those of Nb 3 Sn. Results are given for two different specimen reaction temperatures, 700 and 750°C. Increases in I c for low-fluence ( 3 Sn were observed, but with greater relative increases for the specimens (750°C) that had the lower initial current density. Decreases in I c at higher fluences scaled with the measured decreases in T c similar to behavior of Nb 3 Sn. Increases in H c2 of the lower-temperature-reacted specimens were much smaller than those observed in Nb 3 Sn. In the higher-temperature-reacted specimens, the lack of any H c2 increases at all suggests that some kind of limiting mechanism is active. For neutron fluences above \sim 5 \times 10^{18} n/cm2the limiting of H c2 is not in evidence.
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