HIγS

HIγS

The High Intensity γ-ray Source (HIγS) at the Duke Free Electron Laser Laboratory provides a quasi mono-energetic, linearly polarized photon beam up to 100 MeV. Since 2012, the γ3 setup is the prime detector array used for photon scattering experiments. It picks up the idea of a parity sensitive arrangement of high-purity Germanium (HPGe) detectors linked with an array of Cerium doped Lanthanum-Bromide (LaBr3:Ce) detectors to enable γγ-coincidence measurements. The deexciting transitions follow different angular distributions depending on the spin and parity quantum numbers of the excited state. The γ3 setup enables the measurment of spin and parity quantum numbers, energy eigenvalues, intensity branching ratios, and multipole mixing ratios.

Current experiments:

  • investigation of the E2 decay behavior and search for new decay channels of the scissors mode of 154Gd
  • study of the dipole strength distribution and the Pygmy Dipole Resonance (PDR) of 150Nd and 154Gd

Previous experiments:

  • energy separation of the parity doublet of 20Ne (2011)
  • search for exotic decay channels of the scissors mode of 76Ge, 150Nd, 150Sm, 156Gd, and 162,164Dy (2011-2016)
  • study of the properties of the Pygmy Dipole Resonance (PDR) of 50Ti, 50,54Cr, 94Zr, 128,130Te, 140Ce, and 164Dy (2010-)
  • investigation of the dipole strength distribution up to the neutron separation threshold of 40Ar, 76Se, 76Kr, and 164Dy (2012-2016)