Speaker
Description
The Gamma Energy Neutron Energy Spectrometer for Inelastic Scattering (GENESIS) was commissioned at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory (LBNL). The array consists of up to 27 EJ-309 organic scintillators capable of $n-\gamma$ particle discrimination. The $\gamma$-ray detectors include two Compton-suppressed 4-fold segmented Eurosys CLOVER HPGe detectors, several ORTEC PopTop single-crystal HPGe detectors, and LaBr inorganic scintillators. GENESIS includes a custom software analysis suite and modeling framework. The modeling framework for the system is a Geant4-based modular simulation, which can be easily adapted to match changes in the experimental configuration as needed. In order to benchmark the model and provide system characterization, several auxiliary measurements were conducted. These include a long-dwell-time measurement using a 10~mCi $^{252}$Cf source for validating the neutron detection array model, coincident timing resolution measurements, and coincident time calibration measurements. Initial experiments have focused on $(n,n'\gamma)$ reactions, but the use of GENESIS for providing measurements of correlated fission observables is also being explored. Preliminary results from a measurement using a 42~g natural uranium target will be presented. The GENESIS array will enable a variety of nuclear physics measurements providing differential measurements of correlated observables for neutrons and $\gamma$ rays.