München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 31: Instrumentation VII and Applications

HK 31.5: Talk

Tuesday, March 19, 2019, 17:45–18:00, HS 12

Commissioning tests for (e,e’γ) coincidence experiments at the S-DALINAC * — •Gerhart Steinhilber, Tobias Klaus, Ronan Lefol, Norbert Pietralla, and Peter von Neumann-Cosel — Institut für Kernphysik, TU Darmstadt

At the Institut für Kernphysik at the TU Darmstadt high resolution electron scattering experiments at low momentum transfer are performed using the QCLAM electron spectrometer. The electron beam is delivered by the Superconducting Darmstadt Linear Accelerator S-DALINAC. The QCLAM spectrometerfeatures a comparatively large solid-angle coverage of 35 msr and a momentum acceptance of 20%. This makes it suitable for (e,e’x) coincident measurements.

We combine the large acceptance QCLAM spectrometer with fast timing LaBr:Ce detectors to perform (e,e’γ) coincidence experiments. The excitation of the nuclei is studied by measuring inelastically scattered electrons, so that the energy of the excited state is known. The decay back to the ground state is measured by a detector array consisting of high resolution LaBr:Ce detectors with excellent timing properties.

The detectors are shielded from low-energy γ background by a new lead housing. The data acquisition (DAQ) is connected to the QCLAM DAQ and was tested during a QClam beam time in fall 2018. Also, a clear coincidence time signal caused by cosmic radiation showers has been observed off-beam. The concept of the setup, data acquisition, results from the tests will be shown.
* Supported by the DFG within the CRC 1245.