Influence of low temperature neutron irradiation on the superconducting properties of V3Ga multifilamentary wires

The influence of low temperature neutron irradiation on multifilamentary wires of V
3
Ga has been investigated. The critical field H
C2
was measured as a function of temperature in the range of fields 0 to 8 Teslas before, after irradiation and after annealing at room temperature ; so was the critical current I
C
(H,T) on the temperature range 4.2 K to T
C
. The low field part of the curve H
C2
(T) measured in all cases allowed the determination of the Maki parameter and an extrapolation of this curve was done using the Werthamer formula. A decrease of critical current was found, amounting to about 30 % at 4.2 K for the largest irradition dose, 3×10
¹⁸
n/cm
²
. The samples were sensitive to room temperature annealing. A plot of the pinning force versus reduced field shows that the samples do not obey a scaling law, except near T
C
.