Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 36: Instrumentation XII
HK 36.2: Talk
Wednesday, February 28, 2018, 14:15–14:30, HZO 90
Improved two-gamma decay measurement setup and NEPTUN status report — •Patrick van Beek1, Thomas Aumann1,2, Martin Baumann1, Michael Beckstein1, Daniel Körper1,2, Bastian Löher1,2, Heiko Scheit1, and Dmytro Symochko1 — 1TU Darmstadt — 2GSI Helmholtzzentrum
The low-energy photon tagging facility NEPTUN at the superconducting Darmstadt linear accelerator (S-DALINAC) can be used to study the photoabsorption cross section of nuclei in the energy regions of Pygmy Dipole and Giant Dipole Resonances. From the complete photo nuclear cross section spectrum one can calculate the diagonal dipole polarizability of the nucleus, which helps constraining the symmetry energy in the equation of state. A major upgrade of NEPTUN is underway, which will be presented.
One approach to investigate the off-diagonal dipole polarizability of nuclei is to study the two-gamma decay of excited nuclear states. A new experimental setup is being developed which will use state of the art LaBr3 scintillators with excellent time and energy resolution in combination with Heidelberg-Darmstadt-Crystal-Ball NaI spectrometer. To suppress unwanted Compton events a collimating lead ball (BACCHUS) will be used. This promises significantly reduced background conditions and higher count rates compared to our previous setup.
Supported by DFG (SFB 1245).