Abstract
The loss of nuclear alignment and the precession of the ${\frac{5}{2}}^{\ensuremath{-}}$ state of $^{237}\mathrm{Np}$ nuclei (${H}_{\mathrm{ext}}=1.3$ T), recoil implanted into Pb at various temperatures, have been measured by the $\ensuremath{\alpha}\ensuremath{-}\ensuremath{\gamma}$ time differential perturbed angular correlation technique. It was deduced that the implanted $^{237}\mathrm{Np}$ ion is in a +6 state with its $5f$ electron in a localized state and that the loss of nuclear alignment is caused by a pure paramagnetic relaxation with an average atomic correlation time of 2.3\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}13}$ s. Lead was found to offer a quadrupole-perturbation-free environment for the Np implants.
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