N. Pietralla and K. Sonnabend for the SFB 634 Nuclear Structure Physics at the Darmstadt superconducting electron linear accelerator S-DALINAC N. Pietralla and K. Sonnabend for the SFB 634 Workshop on European Small-Scale Accelerator Facilities Aghios Nikolaos, Crete, Greece September 7th to 8th, 2007 supported by the DFG under grant No. SFB 634

Accelerator hall of the S-DALINAC HIPS – electron energies from 2 to 130 MeV available – cw and pulsed beam operation possible – source for polarized electron beams under construction

HIPS – High-intensity photon setup – continuous-energy bremsstrahlung – 2 MeV ≤ Emax ≤ 11 MeV – photon intensities: 106 keV-1s-1cm-2 – two target positions for simultanuous (g,g‘) experiments – up to four HPGe detectors  partly passively shielded  partly segmented

HIPS – High-intensity photon setup 1- 11B

Experimental hall of the S-DALINAC NEPTUN – High-resolution tagger tagger system

NEPTUN – High-resolution tagger focal plane radiator magnet coincidence experiment 1 m Energy range: 6 MeV ≤ Eg ≤ 20 MeV Energy resolution: DE = 25 keV @ 10 MeV Energy window: ≈ 3 MeV Photon intensity: ≈ 104 keV-1s-1 Photon energy: Eg = Ei - Ee

NEPTUN – High-resolution tagger – simulation of detector response – untagged photon spectrum – tagged photon spectrum: Eg = 10 MeV

Experimental hall of the S-DALINAC LINTOTT – High-resolution spectrometer LINTOTT

LINTOTT – High-resolution spectrometer electrons energy range: 18 MeV ≤ Ee ≤ 120 MeV detector system detector system: 96 silicon strip detectors scattered electrons deflection angle: 169.6º ± 0.1º scattering chamber energy resolution: DE/E ≈ 1  10-4 data rate: up to 100 kHz

LINTOTT – High-resolution spectrometer 94Mo(e,e’) excitation energy / MeV 1 2 3 4 counts / mC 0.0 0.1 0.2 – very good energy resolution (see ground-state) – far-off yrast spectroscopy possible (up to observed) – ideal method to study one-phonon modes  symmetric quadrupole phonon  symmetric octupole phonon  mixed-symmetry state O.Burda et al., PRL 99 (2007) 092503

LINTOTT – High-resolution spectrometer Planned experimental program Determination of excitation strengths and form factors of low-spin excitations – mixed-symmetry states in mass regions A = 90 and 130 – intrinsic structures in shape-phase transitional nuclei – investigation of new electric dipole modes (besides IVGDR) form factors of PDR states in N = 82 isotones and 208Pb find evidence for purely transverse E1 mode below GDR

Experimental hall of the S-DALINAC QCLAM – Large acceptance spectrometer QCLAM

QCLAM – Large-acceptance spectrometer Planned experimental program – (e,e‘x) coincidence experiments for the investigation of new electric dipole modes (besides IVGDR) form factors of PDR states in N = 82 isotones and 208Pb find evidence for purely transverse E1 mode below GDR – excitation and decay of ISGDR in 58Ni, 90Zr, 140Ce, and 208Pb – experiments on a-cluster states in light N = Z nuclei – (e,e‘g) coincidence measurements using Ge detectors

Experimental hall of the S-DALINAC NEPTUN HIPS QCLAM LINTOTT

Photon scattering - Nuclear Resonance Fluorescence U. Kneissl, N. Pietralla, A. Zilges, J. Phys. G 32 (2006) R217 HPGe target energy intensity electrons radiator target energy intensity bremsstrahlung