Mass Measurements at the Wright Nuclear Structure Laboratory

A program to measure masses along the astrophysical rp-process path in the A～60–80 region is underway at the Wright Nuclear Structure Laboratory, Yale University. The classic technique of end-point determinations for β⁺ spectra measured in coincidence with daughter γ-rays is used to determine Q _EC which, in turn, is used to calculate the mass. Several innovations have been incorporated to increase the sensitivity and selectivity of the method. Results of recent experiments are reported.