Proton separation energies for some rare earth isotopes

Reaction Q values for the (3He,d) and (α,t) single proton transfer reactions on targets of Gd, Dy, Er, and Yb have been measured with a magnetic spectrograph. Proton separation energies, Sp, are presented for 156,157,158,159,161Tb, 161,162,163,164,165Ho, 165,167,168,169,171Tm, and 171,172,173,174,175,177Lu. Although the uncertainties of the absolute Q values are approximately 15 keV, the use of isotopically mixed and natural targets resulted in probable errors of only 1–3 keV for the differences in Q values of the isotopes identified in each target. As the proton separation energy was previously known to within 1–3 keV for one isotope of each element studied, it is now possible to present SP values with errors of a few keV for ail the nuclides listed above.