Development of isobar separation for 182Hf AMS measurements of astrophysical interest

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Mass Spectrometers, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Energy Loss And Stopping Power

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The detection of 182Hf by Accelerator Mass Spectrometry (AMS) is greatly complicated because of the stable and common isobar 182W. Although significant W reduction can be achieved during negative ion formation using HfF5-, additional separation is necessary to achieve detection sensitivities sufficient for astrophysical applications, i.e. detection of potential supernova-produced 182Hf on Earth. In this paper, we present a new development of isobar separation using the ΔTOF detection method at the Munich MP Tandem accelerator (TV = 14 MV), where ion energies for 182Hf of about 1 MeV/amu can be achieved. Particular attention is drawn on specific energy loss and energy loss straggling measurements in various materials, the basis for our method of isobar separation.

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