Abstract
A new photon tagging spectrometer was built at the superconducting
Darmstadt electron linear accelerator (S-DALINAC). The system is
designed for tagging photons in an energy range from 6 to 20 MeV with
the emphasis on best possible energy resolution and intensity. The
absolute energy resolution of photons at 10 MeV is expected to be about
20 keV. With scintillating fibres as focal-plane detectors a maximum
rate of tagged photons of 10 4 keV(-1)s(-1) will be achieved. Detailed
design studies including Monte Carlo simulations are presented, as well
as results for the measured tagged photon energy profile of the system
realized so far. This photon-tagging facility will allow to determine
the photon absorption cross-sections as a function of excitation energy
and to study the decay patterns of nuclear photo-excitations in great
detail. (C) 2009 Elsevier B.V. All rights reserved.
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