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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Instrumentierung

HK 51.7: Vortrag

Donnerstag, 20. März 2014, 18:15–18:30, HZ 9

Detection efficiency of the neutron detector BELEN-48 measured at the PTB Braunschweig — •Michele Marta^1,2, Jorge Agramunt³, Roger Caballero-Folch⁴, Guillem Cortés⁴, Iris Dillmann^1,2,5, Martin Erhard⁶, Luis M. Fraile⁷, Ulrich Giesen⁶, Ralf Nolte⁶, Albert Riego⁴, Stefan Röttger⁶, and Jose Luis Taín³ — ¹GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — ²II. Physikalisches Institut, Justus-Liebig Universität Giessen, Germany — ³IFIC-CSIC University of Valencia, Valencia, Spain — ⁴INTE-DFEN, Universitat Politecnica de Catalunya, Barcelona, Spain — ⁵TRIUMF, Vancouver, Canada — ⁶Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany — ⁷Universidad Complutense de Madrid, Spain

The BEta-deLayEd Neutron detector BELEN-48 is a highly efficient detector of β-delayed neutrons, for nuclear structure, nuclear astrophysics and reactor studies. It consists of 48 ³He proportional counters arranged in a polyethylene matrix in a way that the detection efficiency remains constant for neutron energies from thermal up to a few MeV. In order to validate MCNPX simulations, the detection efficiency has been calibrated with well-known (p,n) and (α,n) reactions on ⁷Li, ¹³C and ⁵¹V producing neutrons with energies between 0.1 and 5 MeV. The experiment has been performed at the neutron metrology facility of PTB, which allowed the measurement of yields and angular distributions with a calibrated monitor. The new results indicate anisotropies, which are not reported in literature and have been taken into account to obtain the experimental efficiencies for BELEN.