SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 60: Structure and Dynamics of Nuclei XII
HK 60.2: Vortrag
Donnerstag, 23. März 2023, 14:15–14:30, SCH/A215
16O(n,α0)13C Cross Section Normalization based on a new Time-of-Flight measurement using a Frisch Grid Ionisation Chamber — Sebastian Urlass1, •Arnd Junghans1, Roland Beyer1, and Arjan Plompen2 — 1Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, 01328 Dresden, Germany — 2European Commission, Joint Research Center (JRC), Retieseweg 111 2440 Geel, Belgium
The 16O(n,α)13C reaction plays an important role in nuclear technology. Oxygen is a major component of the fuel and in the water coolant of nuclear power reactors. This reaction influences criticality through the removal of neutrons and produces helium in the fuel which may lead to swelling. A new reaction cross section measurement was carried out at the time-of-flight facility GELINA using a Frisch-gridded ionization chamber. Between the reaction threshold and a neutron energy of 9 MeV, 16O(n,α0)13C events on the CO2 admixture in the counting gas could be well identified. The cross sections were determined relative to relative to the neutron-induced fission cross section standard of 235U using the H19 fission chamber of PTB and compared to recent evaluations. Special care was taken to quantify all sources of systematic uncertainties based on measurements. The integral over the data from 4 to 5.3 MeV allows the normalization of evaluated 16O(n,α0)13C reaction cross sections and data in the literature to about 6% uncertainty. The new cross section normalization is compared with results deduced from thin target measurements of the inverse reaction 13C(α,n)16O and thick target yields.