Spectroscopy of 208Pb

The reaction used in the experiment was 209Bi(t,αγ)208Pb, with Et = 11.5 MeV. This pick-up reaction populates states in 208Pb with a πh9/2 component, i.e. positive parity states between 1+ and 10+, and negative parity between 2- and 7-. Making full use of the good resolution of the Ge detectors and the α-γ coincidence method ensured that I could resolve levels to within 2 keV. I found that I also have good relative proton pickup strengths, and therefore can be reasonably sure of the πh9/2 components of the levels populated in this experiment. The level placement was determined by setting gates on the α particles to show where the γ came from, or setting windows on the γ rays to determine the energy of the coincident α particle. Some complications were engendered by the presence of doublets or triplets, either in level or in γ ray energy. (author)