Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics Nuclear Astrophysics at the Darmstadt superconducting electron linear accelerator.

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics

Nuclear Astrophysics at the Darmstadt superconducting electron linear accelerator

S-DALINAC

N. Pietralla and K. Sonnabendfor 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

– electron energies from 2 to 130 MeV available– cw and pulsed beam operation possible– source for polarized electron beams under construction

HIPS


HIPS – High-intensity photon setup

photon energies up to 11 MeV available

electrons

Emax

0 ≤ E ≤ Emax

0 ≤ E ≤ Emax

n

Au/Re - target

n

11B - target

N ≈ 105 / (keV s cm2)

≈ 300 · N

collimator

radiator

Activation with continuous-energy bremsstrahlung


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

Pb

Cu

Cu

LEPS LEPS

Pb Pb

Pb

HPGe

– complementation with x-ray detectors and electron counters

Determination of activation yield with -spectroscopy


LCS – Laboratory for counting and spectroscopy

Sample decay spectra: LEPS versus HPGe


NEPTUN – High-resolution photon tagger

High-resolution cross section measurements

detectorarray


NEPTUN – High-resolution photon tagger

– 14 liquid scintillator neutron detectors

– 8 additional 10B 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 ≤ En ≤ 10 MeV


QCLAM – Large-acceptance spectrometer

(e,e‘x) experiments of astrophysical interest

QCLAM



– clamshell dipole magnet (deflection angle: 120°)

– quadrupole magnet

– three multiwire drift chambers

– plastic scintillation and plexiglas Cherenkov counters

– momentum resolution: p/p = 2 10-4

– solid angle acceptance: 35 msr

– max. central momentum: 200 MeV/c

– momentum acceptance: ±10%



– momentum resolution: p/p = 2 10-4

– solid angle acceptance: 6.4 msr

– max. central momentum: 95 MeV/c

– momentum acceptance: -5% to +8%

Electron scattering at 180° deflection angle



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



Role of neutrino-induced reactions

properties of pre-collapse core supernova shock revivalexplosive nucleosynthesis

– branching ratios of 12C(e,e‘) electro-weak theory (,‘) cross sections

nucleosynthesis of 9Be and 10B

– high resolution (e,e‘) data M1 strength distribution GT0 from shell-model calc. -nucleus cross section

Shell-Modeltotal

Orbital

Spin

52CrS-DALINAC

excitation energy / MeV

K. Langanke et al., PRL 20 (2004) 202501

B(M

1) /

N

B(M

1) /

N


Experimental hall of the S-DALINAC

QCLAM

NEPTUN

HIPS

Kerstin Sonnabend, IKP, TU Darmstadt S-DALINAC - Nuclear Astrophysics Nuclear Astrophysics at the Darmstadt superconducting electron linear accelerator.

Documents

tu darmstadt sdalinac

kerstin sonnabend

sdalinac electron energies

qclam slide

hpge slide

mev slide

spectroscopy slide

mevc momentum acceptance