Analysis of nuclear resonance fluorescence excitation measured with LaBr3(Ce) detectors near 2MeV

Omer, Mohamed; Negm, Hani; Ohgaki, Hideaki; Daito, I.; Hayakawa, Takehito; Bakr, Mahmoud; Zen, Heishun; Hori, T.; Kii, Toshiteru; Masuda, Kai; Hajima, Ryoichi; Shizuma, T.; Toyokawa, Hiroyuki; Kikuzawa, N.

doi:10.1016/j.nima.2013.06.083

Cited by 9 publications

(14 citation statements)

References 24 publications

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“…The situation is more complicated with odd nuclei, which are characterized by half-integer ground state spin. Figure 3 demonstrates A (θ) and patterns of four possible transitions of a nucleus with a ground state spin of 5 2 . The allowed spins of the excited state include 3 2 , 5 2 , or 7 2 for dipole and 9 2 for quadrupole.…”

Section: Anisotropymentioning

confidence: 99%

“…The allowed spins of the excited state include 3 2 , 5 2 , or 7 2 for dipole and 9 2 for quadrupole. Except for the spin sequence 5 2 → 3 2 → 5 2 with almost isotropic angular distribution, it is easy to distinguish the parity of the dipole transition. In contrast, the sensitivity of A (θ) and R (θ) to differentiate the dipole from the quadrupole transitions of the excited state is lower than the even-even nuclei.…”

Section: Anisotropymentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

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Monte Carlo Simulation of γ − γ Correlation Functions

Omer

Bakr

2020

Atoms

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γ − γ correlation functions are mathematical expressions that describe the angular distribution of cascade γ -rays emitted from an atomic nucleus. Cascade transitions may occur in either a two-step deexcitation or through an excitation-deexcitation process of a particular energy level inside the nucleus. In both cases, the nucleus returns to its ground energy state. Spin and parity of the excited state can be determined experimentally using the asymmetry of the angular distribution of the emitted radiation. γ − γ correlation functions are only valid for point-like targets and detectors. In the real experiments, however, neither the target nor the detector is point-like. Thus, misassignment of the spin-parity of energy levels may easily take place if only the analytical equations are considered. Here, we develop a new Monte Carlo simulation method of the γ − γ correlation functions to account for the extended target and detector involved in spin-parity measurements using nuclear resonance fluorescence of nuclei. The proposed simulation tool can handle arbitrary geometries and spin sequences. Additionally, we provide numerical calculations of a parametric study on the influence of the detection geometry on the angular distribution of the emitted γ -rays. Finally, we benchmark our simulation by comparing the simulation-estimated asymmetry ratios with those measured experimentally. The present simulation can be employed as a kernel of an implementation that simulates the nuclear resonance fluorescence process.

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Section: Anisotropymentioning

confidence: 99%

Section: Anisotropymentioning

confidence: 99%

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Monte Carlo Simulation of γ − γ Correlation Functions

Omer

Bakr

2020

Atoms

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“…Analysis of LaBr 3 :Ce spectra was performed using a LabView interface dedicated for this purpose and for implementing the RAEC algorithm (see next sub section). Details about the LaBr 3 :Ce detector array are provided in [2].…”

Section: A Signal Processing and Data Acquisitionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Omer

Negm

Zen

et al. 2013

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)

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A real-time automatic energy calibration (RAEC) algorithm of a LaBr 3 :Ce scintillation detector array has been developed. The energy markers for this calibration are the selfactivity lines inherently existing inside the LaBr 3 crystal. Five energy markers were used in this technique. Two lines are from the radioactive isotope of lanthanum, 138 La, at 789 and 1436 keV while the other three are from the 227 Ac which is thought to be the source of the self-activity of LaBr 3 detectors near 2 MeV energy range. The energy calibration extracted from RAEC algorithm is evaluated by a comparison with the energy calibration that was established using 56 Co radioactive checking source. The two energy calibrations showed a good agreement, indicating a high potential to use the self-energy calibration technique for LaBr 3 :Ce detectors. L 978-1-4799-0534-8/13/$31.00 ©2013 IEEE

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Validation of GEANT4 simulation for active materials interrogation using nuclear resonance fluorescence

Negm,

Ohgaki

2024

Journal of Radiation Research and Applied Sciences

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Analysis of nuclear resonance fluorescence excitation measured with LaBr3(Ce) detectors near 2MeV

Cited by 9 publications

References 24 publications

Monte Carlo Simulation of γ − γ Correlation Functions

Monte Carlo Simulation of γ − γ Correlation Functions

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

Validation of GEANT4 simulation for active materials interrogation using nuclear resonance fluorescence

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