Nuclearg-factor measurements of the92−and212−isomeric states inTa173

Abstract

The nuclear $g$-factors of the one-quasiparticle isomeric state ${\frac{9}{2}}^{\ensuremath{-}}$ at 165.8 keV and the three-quasiparticle isomeric state ${\frac{21}{2}}^{\ensuremath{-}}$ at 1713.2 keV in $^{173}\mathrm{Ta}$ nuclei have been measured using the time differential perturbed angular distribution technique. The nuclear reaction $^{165}\mathrm{Ho}$($^{12}\mathrm{C}$, $4n$\ensuremath{\gamma})$^{173}\mathrm{Ta}$ was used to populate these isomeric states, and the recoiling $^{173}\mathrm{Ta}$ nuclei were implanted into a thick tantalum backing in the presence of a 7.04(4) kG external magnetic field. The measured value $g$(${\frac{9}{2}}^{\ensuremath{-}}$) = +0.591(18) shows that the ${\frac{9}{2}}^{\ensuremath{-}}$ isomeric state is not a pure single-particle state but may have a collective contribution due to the octupole excitation of the core. Based on the measured value $g$(${\frac{21}{2}}^{\ensuremath{-}}$) = + 0.620(15) and multi-quasiparticle calculations, the ${\frac{21}{2}}^{\ensuremath{-}}$ isomeric state is assigned a mixed configuration: ${\ensuremath{\pi}}^{3}${${\frac{9}{2}}^{\ensuremath{-}}$[514], ${\frac{7}{2}}^{+}$[404], ${\frac{5}{2}}^{+}$[402]} (39%) and ${\ensuremath{\pi}}^{1}${${\frac{7}{2}}^{+}$[404]}$\ensuremath{\bigotimes}$ ${\ensuremath{\nu}}^{2}${${\frac{7}{2}}^{\ensuremath{-}}$[514], ${\frac{7}{2}}^{+}$[633]} (61%).