Analysis of the (p,t) reaction onDy158

The level structure of ${}_{}{}^{156}{}_{}{}^{}\mathrm{Dy}$ has been investigated with the ($p,t$) reaction at 29.9-MeV incident proton energy. Angular distributions were measured for transitions to 34 levels up to an excitation energy of 2.25 MeV in ${}_{}{}^{156}{}_{}{}^{}\mathrm{Dy}$. The ground-state $Q$ value for this reaction was determined to be $Q_0=-7.535\mathrm{}\pm 0.015$ MeV. Optical-model parameters were obtained self-consistently in the coupled-channels approach, and reaction calculations using these parameters demonstrated a very large destructive interference between direct and indirect transfer to the $2^{+}$ member of the ground-state band. The anomalously strong transition to the $J^{\pi }=0^{+}$ state at 674 keV is interpreted in the model of Van Rij and Kahana, leading to suggestions as to the structure of this state. The strong $L=2\mathrm{}$ transition to the $J^{\pi }=2^{+}$ state at 890 keV is also discussed. Further evidence is given on the structure of the $J^{\pi }=2^{+}$ state at 1520 keV, and the $J^{\pi }=4^{+}$ state at 1627.3 keV which has been suggested to belong to the "super" band in ${}_{}{}^{156}{}_{}{}^{}\mathrm{Dy}$.