Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics Nuclear Astrophysics 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 7 th to 8 th, 2007 supported by the DFG under grant No. SFB 634

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics Accelerator hall of the S-DALINAC – electron energies from 2 to 130 MeV available – cw and pulsed beam operation possible – source for polarized electron beams under construction HIPS

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics HIPS – High-intensity photon setup photon energies up to 11 MeV available electrons E max 0 E E max 0 E E max n Au/Re - target n 11 B - target N 10 5 / (keV s cm 2 ) 300 · N collimator radiator Activation with continuous-energy bremsstrahlung

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics LCS – Laboratory for counting and spectroscopy – three low-energy photon spectrometers (LEPS) – four 30% and 40% HPGe detectors – setups with passive Cu and/or Pb shielding Pb Cu LEPS Pb HPGe – complementation with x-ray detectors and electron counters Determination of activation yield with -spectroscopy

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics LCS – Laboratory for counting and spectroscopy Sample decay spectra: LEPS versus HPGe

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics NEPTUN – High-resolution photon tagger High-resolution cross section measurements detector array

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics NEPTUN – High-resolution photon tagger – 14 liquid scintillator neutron detectors – 8 additional 10 B enriched liquid scintillator detectors – high-resolution cross section measurements – determination of angular momentum of neutrons – (,p) and (, ) in preparation Determine (,n) cross sections with 100 keV E n 10 MeV

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics QCLAM – Large-acceptance spectrometer (e,ex) experiments of astrophysical interest QCLAM

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics QCLAM – Large-acceptance spectrometer – clamshell dipole magnet (deflection angle: 120°) – quadrupole magnet – three multiwire drift chambers – plastic scintillation and plexiglas Cherenkov counters – momentum resolution: p/p = – solid angle acceptance: 35 msr – max. central momentum: 200 MeV/c – momentum acceptance: ±10%

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics QCLAM – Large-acceptance spectrometer – momentum resolution: p/p = – solid angle acceptance: 6.4 msr – max. central momentum: 95 MeV/c – momentum acceptance: -5% to +8% Electron scattering at 180° deflection angle

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics QCLAM – Large-acceptance spectrometer Recent results on M1 deuteron break-up – high energy resolution and high selectivity of M1 states – precision test of modern theoretical models (potential model, EFT) – prediction of p(n, )d cross section at Big Bang energies

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics QCLAM – Large-acceptance spectrometer Role of neutrino-induced reactions properties of pre-collapse core supernova shock revival explosive nucleosynthesis – branching ratios of 12 C(e,e) electro-weak theory (, ) cross sections nucleosynthesis of 9 Be and 10 B – high resolution (e,e) data M1 strength distribution GT 0 from shell-model calc. -nucleus cross section Shell-Model total Orbital Spin 52 Cr S-DALINAC excitation energy / MeV K. Langanke et al., PRL 20 (2004) B(M1) / N

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics Experimental hall of the S-DALINAC QCLAM NEPTUNHIPS