Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 63: Accelerators and Instrumentation II

HK 63.6: Talk

Wednesday, March 18, 2009, 18:15–18:30, H-ZO 90

Development and construction of a detector array for (γ,n) experiments at NEPTUN^* — •Vanessa Simon, Bastian Loeher, Norbert Pietralla, Linda Schnorrenberger, Deniz Savran, and Kerstin Sonnabend — Institut für Kernphysik, Technische Universität Darmstadt, Germany

The low-energy photon tagger NEPTUN [1] has been built at the superconducting electron accelerator S-DALINAC at TU Darmstadt. This spectrometer generates a tagged photon beam in an energy range between 6 MeV < E_γ < 20 MeV.

For (γ,n) experiments a neutron detector array will be designed in a 4π-geometry consisting of 17 detectors. Each detector contains liquid scintillators so that pulse shape discrimination methods can be applied. Four of the detectors are in addition loaded with 5% ¹⁰B to further discriminate between neutrons and photons via the capture reaction ¹⁰B(n,α)⁷Li. The special conditions, as well as initial developments and construction work is shown. Furthermore, first experiments and efficiency measurements are presented.

^* supported by the DFG (SFB 634)

[1] K. Lindenberg, PhD Thesis, TU Darmstadt, 2008.