Author/Authors :
Lِher، نويسنده , , B. and Derya، نويسنده , , V. and Aumann، نويسنده , , John T. and Beller، نويسنده , , J. and Cooper، نويسنده , , N. and Duchêne، نويسنده , , M. and Endres، نويسنده , , Neil J. and Fiori، نويسنده , , E. and Isaak، نويسنده , , J. and Kelley، نويسنده , , J. and Knِrzer، نويسنده , , M. and Pietralla، نويسنده , , Colin N. and Romig، نويسنده , , C. and Savran، نويسنده , , D. and Scheck، نويسنده , , M. and Scheit، نويسنده , , H. and Silva، نويسنده , , J. and Tonchev، نويسنده , , A. and Tornow، نويسنده , , W. and Weller، نويسنده , , H. and Werner، نويسنده , , V. and Zilges، نويسنده , , A.، نويسنده ,
Abstract :
The existing Nuclear Resonance Fluorescence (NRF) setup at the HI γ S facility at the Triangle Universities Nuclear Laboratory at Duke University has been extended in order to perform γ – γ coincidence experiments. The new setup combines large volume LaBr 3 : Ce detectors and high resolution HPGe detectors in a very close geometry to offer high efficiency, high energy resolution as well as high count rate capabilities at the same time. The combination of a highly efficient γ - ray spectroscopy setup with the mono-energetic high-intensity photon beam of HI γ S provides a worldwide unique experimental facility to investigate the γ - decay pattern of dipole excitations in atomic nuclei. The performance of the new setup has been assessed by studying the nucleus 32S at 8.125 MeV beam energy. The relative γ - decay branching ratio from the 1+ level at 8125.4 keV to the first excited 2+ state was determined to 15.7(3)%.
Keywords :
? - ray spectroscopy , Lanthanum bromide , High-purity germanium , Coincidence measurement , high efficiency , Nuclear resonance fluorescence
