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Optimization of the photoneutron target geometry for e-accelerator based BNCT.

Nahid Chegeni1, Saleh Boveiry Pur2, Sasan Razmjoo3

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Optimizing photoneutron target design is crucial for electron accelerators. Tungsten target thickness and geometry significantly impact neutron output, with effective interaction area and photon incidence angle being key factors for maximizing flux.

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Area of Science:

  • Nuclear Physics
  • Accelerator Technology
  • Radiation Detection

Background:

  • Electron accelerators are increasingly utilized as photoneutron sources.
  • Designing efficient photoneutron targets is critical for maximizing epithermal neutron flux.
  • The study investigates the influence of target parameters on neutron production.

Purpose of the Study:

  • To investigate the effect of photoneutron target thickness and geometry on neutron output.
  • To optimize the design of photoneutron targets for enhanced neutron production.
  • To identify key factors influencing photoneutron flux.

Main Methods:

  • Utilized Monte Carlo simulations with the MCNP code.
  • Simulated a pencil photon source with energies ranging from 13 to 25 MeV.
  • Investigated tungsten targets with varying geometries and thicknesses.

Main Results:

  • Maximum neutron flux was observed around 0.46 MeV for all configurations.
  • Neutron flux increased with thickness up to 2 cm, then decreased.
  • Effective target thickness and photon incidence angle significantly affected photoneutron output.

Conclusions:

  • Target geometry and shape are critical for optimizing neutron flux, energy spectrum, and convergence.
  • Consideration of beam shaping assembly (BSA) is important in target design.
  • Further investigation into these factors is recommended for practical applications.