Authors
Callahan, Lauren; Collon, P.; Paul, M.; Avila, M.; Back, B. B.; Bailey, T.; Clark, A.; Dickerson, C.; Greene, J. P.; Jayatissa, H.; Jiang, C. L.; Kashiv, Y.; Nelson, A.; McLain, J.; Pardo, R.; Potterveld, D.; Rehm, K. E.; Sahoo, R.; Scott, R.; Seweryniak, D.; Tolstukhin, I.; Vondrasek, R.
Abstract
As the scope of Accelerator Mass Spectrometry (AMS) expands, there isan increased need to extend the capability of isobaric separation to themedium-heavy mass region. Existing AMS facilities are limited in their ability to separate radioactive nuclei in the A=100-200 range of interest from Gas-Filled Analyzer (AGFA) with high magnetic rigidity. Since that time,MONICA, an eight-anode ionization chamber that measures both energy lossand position with two sets of split anodes, has been developed to aid in AMSexperiments at AGFA and has undergone four commissioning runs at theNuclear Science Laboratory at the University of Notre Dame utilizing Si,Fe/Ni, and Mn beams. This report will present the 11/2019 AGFA AMS runand the subsequent commissioning runs of the MONICA detector, includingpreliminary measurements on the long-lived isotopes 39Ar (268 y) and for thefirst time on 42Ar (33 y).their neighboring stable isobars, as such measurements require higher energies than available in most facilities. ATLAS is one of the highest energysystem used for AMS based experiments and has enabled isobaric discrimination for medium to heavy nuclides, notably via the Gas-Filled Magnettechnique. A preparatory experiment performed in November, 2019, successfully demonstrated isobaric separation of 92Zr-92Mo using the Argonne