Chad Ummel successfully defended his PhD, based on work with GODDESS to study the 134Xe(d,p) reaction. Neutron-transfer reactions can be used to probe the the single-neutron states of nuclei near the shell closures. 135Xe lies just one neutron below the N = 82 closed shell. Using the (d, p) reaction on 134Xe, single-particle excitations of the unpaired 81st neutron in 135Xe were observed. This 134Xe(d, p)135Xe measurement was performed at the ATLAS accelerator facility at Argonne National Laboratory, where the coupled GODDESS (Gammasphere-ORRUBA: Dual Detectors for Experimental Structure Studies) detectors were used to detect reaction protons and decay gamma rays in coincidence. This coincident measurement resulted in the identification of five previously unobserved single-neutron levels in 135Xe.
