Description
Title: G G Correlation Functions Monte Carlo Simulation
Abstract: The mathematical expressions known as g g correlation functions describe the angular distribution of cascade g-rays that are emitted from an atomic nucleus. Both a two-step deexcitation and an excitation-deexcitation process of a specific energy level within the nucleus can result in cascade transitions. The nucleus returns to its ground energy state in both scenarios. The asymmetry of the angular distribution of the emitted radiation can be used to experimentally determine the spin and parity of the excited state. Only point-like targets and detectors are suitable for g g correlation functions. However, neither the target nor the detector are shaped like points in the actual experiments. Therefore, if only the analytical equations are taken into account, incorrect spin-parity assignment of energy levels may occur easily. In order to account for the extended target and detector involved in spin-parity measurements using nuclear resonance fluorescence of nuclei, we here develop a new Monte Carlo simulation method for the g g correlation functions. The suggested simulation tool is flexible enough to work with various spin patterns and geometries. A parametric study on the impact of the detection geometry on the angular distribution of the emitted g-rays is also provided in numerical form. Finally, we benchmark our simulation by contrasting the estimated asymmetry ratios from the simulation with those obtained from experimental measurements. An implementation that simulates the nuclear resonance fluorescence process can use the current simulation as its foundation.
Keywords: angular distribution; nuclear resonance fluorescence; dipole transition; quadrupole transition; spin-parity; Monte Carlo simulation; Geant4
Paper Quality: SCOPUS / Web of Science Level Research Paper
Subject: Physics
Subject Category: Atomic and Molecular Physics, and Optics
Writer Experience: 20+ Years
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