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Rostock 2019 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 4: Accelerator Mass Spectrometry and Applications

MS 4.3: Talk

Wednesday, March 13, 2019, 11:00–11:15, U A-Esch 2

Accelerator mass spectrometry of 93Zr at the Australian National University — •Stefan Pavetich1, L.Keith Fifield1, Michaela B.Froehlich1, Shlomi Halfon2, Yanan Huang1, Dominik Koll1, Martin Martschini3, Michael Paul4, Asher Shor2, Johannes H.Sterba5, Moshe Tessler4, Stephen G.Tims1, Leonid Weissman2, and Anton Wallner11Australian National University, Australia — 2Soreq Nuclear Research Center, Israel — 3University of Vienna, Austria — 4Hebrew University, Israel — 5Technische Universität Wien, Austria

Neutron capture cross sections at keV energies in the Zr mass region are important for nuclear astrophysics as this is the matching point for two components of the slow neutron capture process. Zirconium is used in cladding of nuclear fuel rods and is a high yield fission product, hence production rates of 93Zr (t1/2∼1.6 Ma), are important for nuclear technology and waste management. Despite their significance, neutron capture cross sections for production of 93Zr are poorly known. The long half-life and decay characteristics, make decay counting of 93Zr difficult. We have used accelerator mass spectrometry to measure 93Zr produced by neutron activation of 92Zr with thermal and keV neutrons, yielding independent values for the respective cross section. The main challenge here is the separation of 93Zr from its stable isobar 93Nb. The high particle energies available with the 14UD accelerator at ANU, combined with an 8-anode ionization chamber are ideal to tackle this challenge. The achieved detection limits of 93Zr/Zr∼10−12 could lead to new applications of 93Zr as environmental tracer.

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