Spin Dependence of the Neutron-Capture Cross Section of Vanadium and the Internal Magnetic Field at Vanadium Nuclei

The spin dependence of the neutron-capture cross section of vanadium at 0.115 eV has been measured with the aid of polarized neutrons and polarized vanadium nuclei. It is concluded that the capture cross section of ${\mathrm{V}}^{51}$ is mainly related to spin $J=I-\frac{1}{2}$. In addition, it is shown that the internal field at the vanadium nuclei is less than 4 kOe in very pure vanadium, which apparently does not become ferromagnetic down to 0.06 K.