Abstract

The effects of neutron irradiation on the critical current density J c of vanadium single crystals have been studied. It is shown that the radiation enhances J c up to a fluence of about 4 × 10 18 n/cm 2. The value of the difference in J c 2 before and after irradiation divided by J c 2 before irradiation, [ J c(A.I.) 2− J c(B.I.) 2]/ J c(B.I.) 2, increases in proportion to the neutron fluence, which is tentatively explained by a model in which J c depends on the interaction between flexible flux lines and randomly distributed pinning centers.

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