Characterization of isomers inHo158

The experimentally known isomers of ${}_{}{}^{158}{}_{}{}^{}\mathrm{Ho}$ have been characterized by estimating the energies of two-quasiparticle excitations. Included in this modeling is the effect of a residual n-p interaction. A 21-min isomer is assigned the configuration $K^{\pi }$ ${=9\mathrm{}}^{+}${${\mathrm{}(7/2)\mathrm{}}^{\mathrm{-}}$[523↑] ${}_{\mathrm{p}{+(11/2)\mathrm{}}^{\mathrm{-}}[505\mathrm{\uparrow }{]}_{\mathrm{n}\mathit{\}}}}{}^{}{}_{}{}^{}$ and is predicted to lie 180 keV above the $5^{+}$ ground state. The antiparallel $K^{\pi }$ ${=2\mathrm{}}^{+}$ state of this configuration is assigned to an observed level at 316 keV. The 21-min isomer decays by an allowed unhindered transition to a 2528-keV level in ${}_{}{}^{158}{}_{}{}^{}\mathrm{Dy}$ for which we confirm the two-quasineutron configuration $K^{\pi }$ ${=8\mathrm{}}^{+}${${\mathrm{}(5/2)\mathrm{}}^{\mathrm{-}}$[523↓] ${}_{\mathrm{n}}{}^{}{}_{}{}^{}$ ${+(11/2)\mathrm{}}^{\mathrm{-}}$[505↑${]}_{\mathrm{n}\mathit{\}}}$. A 27-min $2^{\mathrm{-}}$ isomer at 67.3 keV and a 29-ns $5^{\mathrm{-}}$ isomer at 156.9 keV are assigned the configuration {${\mathrm{}(7/2)\mathrm{}}^{+}$[404↓${]}_{\mathrm{p}}$ ∓${\mathrm{}(3/2)\mathrm{}}^{\mathrm{-}}$[521↑${]}_{\mathrm{n}\mathit{\}}}$. A 1.85-ns $1^{\mathrm{-}}$ isomer at 139.2 keV is assigned the configuration {${\mathrm{}(5/2)\mathrm{}}^{+}$[402↑${]}_{\mathrm{p}}$ ${+(3/2)\mathrm{}}^{\mathrm{-}}$[521↑${]}_{\mathrm{n}\mathit{\}}}$ and the $K^{\pi }$ ${=4\mathrm{}}^{\mathrm{-}}$ member of this Gallagher-Moszkowski pair is predicted to occur at 70 keV. Specific experiments are suggested to verify these predictions.