Commissioning of EMMA

The Electromagnetic Mass Analyser (EMMA) is a new recoil mass spectrometer located in the ISAC-II facility at TRIUMF. EMMA is designed to separate the products of nuclear reactions from the un-reacted beam, and to disperse those products onto detectors at the focal plane in accordance with their mass/charge ratio. The absolute transport efficiency of EMMA has been mapped as a function of energy and angle in a series of in-beam and alpha-source test studies. In addition to these test studies, EMMA has also been successfully used to identify recoils produced from fusion evaporation and radiative capture reactions; the former induced by a radioactive ion beam. This work will ultimately be used to calculate the transport efficiency for arbitrary recoil distributions; thereby allowing measurements of absolute cross sections, which is of vital importance to advancing the nuclear structure and nuclear astrophysics program at TRIUMF.