1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Characterization of the energy spectrum of a 30-MeV cyclotron-based quasi-monoenergetic neutron beam using a time-of-flight spectrometer

TUPS136
3 Jun 2025, 16:00
2h
Exhibiton Hall A _Salmon (TWTC)

Exhibiton Hall A _Salmon

TWTC

Poster Presentation MC3.T28 Neutron Sources Tuesday Poster Session

Speaker

Tzu-Hsiang Lin (National Tsing Hua University)

Description

We conducted time-of-flight (TOF) measurements to characterize the spectrum of a quasi-monoenergetic neutron beam driven by a 30-MeV proton cyclotron at the National Atomic Research Institute in Taiwan*. Neutrons were produced by irradiating 30-MeV protons onto a 1-mm-thick beryllium target. The developed TOF spectrometer comprised two 2-inch EJ-309 organic scintillators positioned 200 mm from the neutron beam port to detect gamma rays emitted from the target, and a 3-inch EJ-309 scintillator placed at a flight distance of 2940 mm to measure neutrons. As the signals of gamma-ray bursts triggered TOF measurements at an RF frequency of 73.13 MHz, repetitive distributions of coincidence events between gamma-ray and neutron-related signals were observed, resulting in an effective time window of 13.67 ns for measuring neutrons in the energy range of 16.19–30 MeV. The measured neutron spectrum exhibited a peak at 26 MeV, verifying the simulated spectrum obtained from an MCNP Monte Carlo model. Additionally, we developed a fast-timing scintillator module that measured the proton bunch duration as 0.97 ns, enabling accurate estimation of the energy resolution of the neutron spectrum.

Footnotes

*K.-Y Chu, et al. Nucl. Eng. Technol., 55, 1559 (2023)

Funding Agency

This work was supported by the College of Nuclear Science at the National Tsing Hua University and the National Science and Technology Council in Taiwan under Grant No. NSTC 112-2623-E-007-004-NU.

Region represented Asia
Paper preparation format LaTeX

Author

Tzu-Hsiang Lin (National Tsing Hua University)

Co-authors

Hong Da Liu (National Tsing Hua University) How Ming Lee (National Atomic Research Institute) Kuo-Yuan Chu (Institute of Nuclear Energy Research) Ting-Shien Duh (Institute of Nuclear Energy Research) Hui-Yu Tsai (National Tsing Hua University) Kuan-Che Lan (National Tsing Hua University) Ming-wei Lin (National Tsing Hua University)

Presentation materials

There are no materials yet.