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The β-NMR detection of  12 B ( I π = 1 + , T 1/2  = 20.2 msec) implanted in a TiO2 (rutile) single crystal following a nuclear reaction showed that its spin polarization produced in the reaction is totally maintained during its lifetime. Two implantation sites with relative populations 9:1 were identified. The electric field gradients (EFGs) were determined to be  q  = +(37.1 0.5) 1015 V/cm2 with η&lt; 0.03 and  q  = +(185 5) 1015 V/cm 2  with η= 0.62 0.02 for the major (90%) and minor (10%) sites, respectively. The EFGs were compared with the theoretical values given by the band-structure calculation in the framework of the KKR method. TiO 2  crystals with proper treatment can be a good “Spin Dewar” in which any short-lived nuclei can be implanted, and their spin polarizations as produced in nuclear reactions can be maintained during their lifetime

Development of a Nuclear Spin Dewar: Hyperfine Interactions of the Short-Lived Emitter 12 B in TiO 2