Development of the pulse NMR method utilizing the short-lived β-emitter 12 B

Abstract

Measurements of the spin-spin relaxation time T2 of the short-lived \(\upbeta \)-emitter \(^{12}B (I^{\uppi }\) = 1 + , T1/2 = 20 ms) in Si have been performed. By applying the spin echo method to \(\upbeta \)-NMR measurements, the intrinsic T2 for 12B in Si was successfully determined with the effect of the static magnetic field inhomogeneity removed. The temperature dependence of T2 for 12B in Si shows that T2 becomes longer with increasing temperature, which seems to reflect the effect of motional narrowing.