Abstract
The Canadian Penning Trap (CPT) mass spectrometer, currently located at the Argonne National Laboratory (ANL), is designed to make precise mass measurements of a wide variety of nuclides with half-lives longer than 30 ms. The radioactive nuclides investigated here are produced through fusion-evaporation reactions using heavy-ion beams from the Argonne Tandem Linac Accelerator System (ATLAS). Once created, the nuclides of interest are separated from the beam using a gas-filled magnetic spectrometer. They are then stopped in a gas catcher filled with 150 Torr of helium, extracted and subsequently guided to a radio-frequency quadrupole ion trap where they are accumulated before being transferred to a high-precision Penning trap. This paper will discuss the mass measurement program underway at ANL using the CPT mass spectrometer with particular emphasis on the latest mass measurements obtained of proton-rich nuclides at A ~ 68 from the reaction of a 225 MeV 58Ni beam upon a 12C target.
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