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Neutron spectrometry with a monolithic silicon telescope
S Agosteo1, G D'Angelo, A Fazzi
1Dipartimento di Ingegneria Nucleare, Politecnico di Milano, Milano, Italy. stefano.agosteo@polimi.it
This study developed a novel neutron spectrometer using a silicon telescope and polyethylene converter. The system effectively distinguishes recoil protons, enabling accurate neutron spectrum analysis up to 8 MeV.
Area of Science:
- Nuclear Physics
- Particle Detection
- Spectroscopy
Background:
- Neutron detection is crucial for various scientific and industrial applications.
- Accurate neutron spectroscopy requires sophisticated detection systems.
- Existing methods may have limitations in energy range or discrimination capabilities.
Purpose of the Study:
- To develop and validate a new neutron spectrometer.
- To assess the system's capability in discriminating recoil protons.
- To evaluate the system's performance in reproducing continuous neutron spectra.
Main Methods:
- Coupling a polyethylene converter with a monolithic silicon telescope (DeltaE and E detectors).
- Irradiating the system with monoenergetic neutrons and neutrons from a Be target.
- Acquiring energy deposition scatter plots using independent electronic chains.
- Utilizing Monte Carlo simulations (FLUKA code) and an analytical model for data analysis.
Main Results:
- Recoil-proton distributions were well-discriminated from secondary electrons above 0.350 MeV.
- The system demonstrated capability in reproducing continuous neutron spectra.
- Experimental spectra showed satisfactory agreement with Monte Carlo simulations and literature data.
Conclusions:
- The developed neutron spectrometer is effective for neutron spectrum analysis.
- The system offers good discrimination of recoil protons.
- The validated analytical model and unfolding code enhance spectral reproduction accuracy.
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