Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 63: Accelerators and Instrumentation II
HK 63.4: Talk
Wednesday, March 18, 2009, 17:45–18:00, H-ZO 90
Photon Tagger NEPTUN* — •L. Schnorrenberger1, M. Elvers2, J. Endres2, J. Glorius1, J. Hasper2, K. Lindenberg1, N. Pietralla1, D. Savran1, V. Simon1, K. Sonnabend1, C. Wälzlein1, and A. Zilges2 — 1Institut für Kernphysik, TU Darmstadt, Germany — 2Institut für Kernphysik, Universität zu Köln, Germany
For various experiments in nuclear physics and astrophysics as well as for technical applications, monoenergetic photon beams are demanded.
The low energy photon tagger NEPTUN at the Superconducting DArmstadt electron LInear ACcelerator S-DALINAC can provide tagged photon beams in the energy range from 6 MeV to 20 MeV at a resolution of 25 keV at 10 MeV.
Photons are produced by relativistic electrons impinging on a thin radiator target. The energy of the scattered electrons is analysed by a magnetic spectrometer. Knowing the difference in energy between the primary beam and the scattered electrons, the energy of each corresponding photon can be determined [1,2].
Recent experiments have shown that a mean resolution of about 35 keV can be obtained for energies between 2 MeV and 12 MeV. Ongoing further improvements on the electron beam will lead to an even better resolution. The analysis of first (γ,γ ’) experiments is in progress.
* supported by the DFG under contract SFB 634
[1] M. Elvers et al., J. Phys. G 35 (2008) 014027.
[2] K. Lindenberg, PhD Thesis, TU Darmstadt, 2008.