(p, t) Population of 0+ states in Dy158,160,162 and Er164,166

Abstract

The (p, t) reaction has been studied on targets of Dy160,162,164 and Er166,168 at a proton energy of 17.5 MeV. Excited 0+ states have been strongly populated in Dy158 (Ex=0.991 MeV, σ=0.09σg.s.), Dy160 (Ex=1.275 MeV, σ=0.16σg.s.), Dy162 (Ex=1.670 MeV, σ=0.13σg.s.), and Er164 (Ex=1.248 MeV, σ=0.07σg.s.). Excited 0+ states in Er166 are much more weakly populated (Ex=1.460 and 2.187 MeV, σ=0.02σg.s.). This result, along with similar studies of Gd and Yb nuclei, indicates that an excited 0+ state retains two-neutron-transfer coherence through the mass region between N=88 (end of shape-transition region) and N=96. Residual nuclei with 98 neutrons have not exhibited a strong (p, t) population of an excited 0+ state. © 1972 The American Physical Society.