Gfactors of92−and232+isomeric states in129Ba

Abstract

The time differential perturbed angular distribution (TDPAD) technique has been used to measure the $g$ factor of the 173 keV ${\frac{9}{2}}^{\ensuremath{-}}$ and 2162 keV ${\frac{23}{2}}^{+}$ isomeric states in ${}^{129}$Ba with respect to the known value of the $g$ factor, $\ensuremath{-}0.159(5)$, of the 10${}^{+}$ isomeric state in ${}^{132}$Ba. The measured internal magnetic field at ${}^{132}$Ba in Fe at room temperature is $\ensuremath{-}6.0(2)$ T. The extracted $g$(${\frac{9}{2}}^{\ensuremath{-}}$) value, $\ensuremath{-}0.192(6)$, is consistent with the pure $\ensuremath{\nu}{\frac{9}{2}}^{\ensuremath{-}}$[514] Nilsson configuration while the $g$(${\frac{23}{2}}^{+}$) value, $\ensuremath{-}0.233(7)$, corresponds to the proposed three-quasineutron configuration ${\frac{5}{2}}^{+}$[402]$\ensuremath{\bigotimes}{\frac{7}{2}}^{\ensuremath{-}}$[523]$\ensuremath{\bigotimes}{\frac{11}{2}}^{\ensuremath{-}}$[505] with the admixture of $\ensuremath{\nu}{\frac{7}{2}}^{+}$[404]$\ensuremath{\bigotimes}{\frac{7}{2}}^{\ensuremath{-}}$[523]$\ensuremath{\bigotimes}{\frac{9}{2}}^{\ensuremath{-}}$[514] configuration.