Nuclear Resonance Fluorescence of ²³⁵U Measured with High-Resolution LaBr₃(Ce) Scintillation Detectors

Abstract

A nuclear resonance fluorescence (NRF) experiment was performed on a 235U target with quasi-monochromatic γ-rays at the High Intensity γ-ray Source (HIγS) facility using a 1733 keV resonant energy. A LaBr3(Ce) detector array consisting of eight cylindrical detectors, each with a length of 7.62 cm and a diameter of 3.81 cm, was implemented in this measurement. Moreover, a high-purity germanium (HPGe) detector array consisting of four detectors, each of which has a relative efficiency of 60%, was used as the benchmark for the measurement taken using the LaBr3(Ce) detector array. The integrated cross section of the NRF level, measured with LaBr3(Ce) detectors, showed good agreement with the available data.

NRF Based Nondestructive Inspection System for SNM by Using Laser-Compton-Backscattering Gamma-Rays

“…Figure 4 shows the NRF (on-beam) spectrum and the background (off-beam) spectrum. The NRF peak at 1733 keV is clearly observed [16].…”

Monte Carlo Simulation of γ − γ Correlation Functions

“…Moreover, the selection rules of dipole transitions in odd nuclei increase the possibilities of excitation to various levels with different spins. The ground state spin of 5 2 may be excited to a state of spin 3 2 , which is almost isotropic. The quadrupole transition with a spin sequence of 5 2 → 9 2 → 5 2 manifests a rather complicated dependence on the geometrical parameters, as indicated in Figures 13-15.…”

“…The technique of using polarized γ-ray beams offers an unambiguous estimation of the spin and parity, while the main detection system is simply γ-ray spectroscopy. Furthermore, many applications rely on the resonance fluorescence, especially in nuclear safeguards and nuclear security [3][4][5].…”

“…We introduced a new class within the frame of the Geant4 toolkit; namely, FCoefficients class. The class returns F-coefficients based on the spin sequence, according to Equation (3). It should be emphasized that we tested the FCoefficients class for the F-coefficients with all constituents, e.g., 3j-and 6j-symbols, and compared them with the tabulated data of references [15,16].…”

Wide range automatic energy calibration of LaBr<inf>3</inf>:Ce detectors by the self-activity lines

“…High detection efficiency with reasonable energy resolution has made LaBr 3 :Ce detectors good candidates for detection of γ-rays. In-beam experiments, such as prompt γ-ray emission in a nuclear fission and photon-induced excitations, are in high demand of using such detectors [1][2][3]. In such measurements, the counting rates are relatively high due to the background radiations accompanying these reactions.…”