Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Nuclear Astrophysics V
HK 57.2: Talk
Thursday, March 17, 2016, 17:00–17:15, S1/01 A04
Measurement of the natural neutron background underground with moderated 3He counters in the Dresden Felsenkeller — •Marcel Grieger1,2, Daniel Bemmerer1, Stefan E. Müller1, Tamás Szücs1, and Kai Zuber2 — 1Helmholtz-Zentrum Dresden-Rossendorf — 2Technische Universität Dresden
A new underground ion accelerator with 5 MV acceleration potential will soon be installed in the Dresden Felsenkeller. The site consists of altogether nine mutually connected tunnels. It is shielded from cosmic radiation by a 45 m thick rock overburden, enabling uniquely sensitive experiments. Here, a measurement of the neutron flux in Felsenkeller tunnel IV is reported. The flux has been measured in three differently shielded laboratories with a set of seven moderated 3He tubes provided by the BELEN collaboration. FLUKA simulations have been used to calculate the detector responses. The observed neutron count rates were unfolded with the MAXED and GRAVEL algorithms, and an energy spectrum has been derived. — Supported by NAVI (HGF VH-VI-417).