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Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 67: Instrumentation XVII

HK 67.5: Talk

Thursday, March 31, 2022, 17:15–17:30, HK-H3

Determination of a high neutron flux using a DT generatorMarie Pichotta, •Hans Hoffmann, and Kai Zuber — TU Dresden IKTP, Dresden, Deutschland

Reproducing r-process reactions on earth is challenging because a very high neutron flux is needed. A promising way is DT implosion at the NIF (National Ignition Facility). There the cross section of reaction 40Ar(2n,γ)42Ar is going to be measured. The reaction 40Ar(n,2n)39Ar will monitor the neutron field. A measurement of the total cross section is needed because theoretical models for this cross section differ.

An argon gas sample enriched in 40Ar was fed into a 20 mm diameter Al sphere at 20 bar. The argon-filled sphere was irradiated with a high neutron flux using the TU Dresden DT neutron generator. It is located at HZDR (Helmholtz-Zentrum Dresden - Rossendorf) and produces a 14 MeV neutron field with densities up to 1012 n/(s cm2). The Ar-filled sphere was positioned in close geometry in order to gain a high neutron flux. 2 metal foils consisting of Al, Zr and Nb respectively, served as neutron monitors. After the irradiation, the monitors’ activity was measured using a germanium detector surrounded by a lead shielding. It was calibrated using point sources of known activity and Monte-Carlo simulations. The irradiation procedure and neutron flux analysis will be presented.

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