Nuclear Magnetic Resonance on Oriented137m,gCe and139Ce

Abstract

Nuclear magnetic resonances of oriented 137m,g Ce and 139 Ce in an iron host have been measured at 7 mK. From the resonance-shift measurement of 137m Ce, the magnetic hyperfine splitting frequency ν=|µ B HF / I h |, the magnetic moment µ and the magnetic hyperfine field B HF were derived as ν=54.25(1) MHz, \(|\mu(^{137\text{m}}\text{Ce}, \frac{11}{2}^{-})|=1.01(4)\mu_{\text{N}}\) and B HF ( 137 Ce Fe )=-38.8(10) T, respectively. The resonance frequencies of 137g Ce Fe and 139 Ce Fe at the external field of 0.2 T were found to be 188.3(5) and 208.5(5) MHz, respectively. With the measured hyperfine field, the magnetic moments of 137g Ce and 139 Ce were deduced as \(|\mu(^{137\text{g}}\text{Ce}, \frac{3}{2}^{+})|=0.96(4)\mu_{\text{N}}\) and \(|\mu(^{139}\text{Ce}, \frac{3}{2}^{+})|=1.06(4)\mu_{\text{N}}\). The measured magnetic moments are compared with the theoretical values based on the core-polarization model.