Local structure of [sup.57]Mn/[sup.57]Fe implanted into lithium hydride

We report the in-beam Mossbauer spectra of [sup.57]Mn implanted into polycrystalline lithium hydride (LiH). Comparing the in-beam Mossbauer spectra data with the results of density functional theory (DFT) calculations, [sup.57]Fe atoms were implanted into Li or H substitutional sites in the LiH crystal. By changing the sample temperature from 11 K to over 800 K, we observed a reduction of [sup.57]Fe at a substitutional H site with a neighboring Li or H atom defect, and an addition of [sup.57]Fe at substitutional H or Li site without neighboring atom defects. It suggests annealing effect-induced recovery. Keywords In-beam Mossbauer Spectroscopy * β-Decay of [sup.57]Mn * Lithium hydride * Density functional theory calculations