Magnetic moment of the 2083 keV level of140Ce

Abstract

For the magnetic moment of the 2083 keV level of ${}^{140}$Ce, there are four published data, all obtained by applying an external magnetic field of less than 5 T to a liquid sample containing ${}^{140}$La using the time-differential perturbed angular correlation (TDPAC) technique. Although these four values are consistent within two times their uncertainties (2\ensuremath{\sigma}), the range of values in 2\ensuremath{\sigma} extends from $\ensuremath{\mu}=+3.0$ to $+$5.2 (in units of nuclear magneton, ${\ensuremath{\mu}}_{\mathrm{N}}$). This time, the TDPAC technique was successfully applied to the 2083 keV level of ${}^{140}$Ce implanted in an Fe foil. The magnetic moment of this level was determined to be $\ensuremath{\mu}=+4.00(20){\ensuremath{\mu}}_{\mathrm{N}}$, employing the known hyperfine field at ${}^{141}$Ce in Fe, \ensuremath{-}41(2) T, which agrees very well with one of the values, $\ensuremath{\mu}=+4.06(15){\ensuremath{\mu}}_{\mathrm{N}}$. The present value is compared with two shell-model calculations.