Study of the <sup>40</sup>Ar(n,2n)<sup>39</sup>Ar Reaction and First Detection of <sup>42</sup>Ar with Accelerator Mass Spectrometry
ORAL
Abstract
ATLAS at Argonne National Laboratory, composed of an Electron Cyclotron Resonance ion source and a superconducting linear accelerator, hosts the sole Accelerator Mass Spectrometry (AMS) setup based on positive ion acceleration to a few MeV/u. A new multi-anode ionization chamber, MONICA, was built to enhance the ion identification for noble gases and medium to heavy mass isotopes. After undergoing commissioning at the University of Notre Dame, MONICA was used to study the 40Ar(n,2n)39Ar (t1/2=268 y) reaction and, for the first time, detect 42Ar (33 y) by AMS. The AMS detection of 39Ar leads to a first measurement of the 40Ar(n,2n)39Ar total reaction cross section at 14 MeV. These isotopes were explored as part of a proposed experiment to probe neutron-induced reactions in a high-density plasma at the National Ignition Facility.
*This work is supported by the NSF, Grant No. NSF PHY-2011890; the NRC, Award No. 31310019M0037; the Israel Science Foundation, Grant No. 876/19; the Pazy Foundation (Israel), the USA-Israel Binational Science Foundation, Nr. 2020136, and the U.S. DOE, Office of Nuclear Physics, Contract No. DE-AC02-06CH11357. This research used resources of ANL’s ATLAS facility, which is a DOE Office of Science User Facility.
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Presenters
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Lauren K Callahan
- University of Notre Dame