New proton radioactivities Ir-165,Ir-166,Ir-167 and Au-171

The new proton radioactivities Ir-165,Ir-166,Ir-167 and (171)AU have been observed. The Lr isotopes were produced via the Mo-92(Kr-78,pxn)Ir-165,Ir-166,Ir-167 reactions at 357 and 384 MeV. (171)AU was produced via the (RU)-R-96(Kr-78,p2n)(171)AU reaction at 389 MeV. The proton emitters were each identified by position, time, and energy correlations between the implantation of a residual nucleus into a double-sided silicon strip detector, the observation of a decay proton, and the subsequent observation of a decay alpha particle from the daughter nucleus (Os-164,Os-165,Os-166 and Pt-170, respectively). Both Ir-166 and Ir-167 have proton-emitting ground and isomeric states, which also decay by alpha emission. The proton-decay rates have been reproduced by calculations using the WKB barrier penetration approximation and a low-seniority shell-model calculation of the spectroscopic factors. The alpha decays of the four nuclei are followed by chains of alpha decays, allowing the determination of single-particle orbital orderings. Mass information has also been obtained from the alpha-decay chains because a connection to a known mass can be obtained for one of the nuclei. Ground-state mass excesses are reported for Tm-151, Yb-154, Lu-155, Hf-158, Ta-159, W-162, Re-163, Os-166, Ir-167, and Pt-170. The mass excess for (171m)AU is also given. Proton separation energies are also deduced for the odd-Z alpha daughter nuclei of the Ir proton emitters.