Characterization of high-energy quasi-monoenergetic neutron energy spectra and ambient dose equivalents of 80-389 MeV 7Li(p,n) reactions using a time-of-flight method

Yosuke Iwamoto, Masayuki Hagiwara, Daiki Satoh, Shouhei Araki, Hiroshi Yashima, Tatsuhiko Sato, Akihiko Masuda, Tetsuro Matsumoto, Noriaki Nakao, Tatsushi Shima, Tadahiro Kin, Yukinobu Watanabe, Hiroshi Iwase, Takashi Nakamura

Research output: Contribution to journalArticle

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Abstract

We completed a series of measurements on mono-energetic neutron energy spectra of the 7Li(p,n) reaction with 80-389-MeV protons in the 100-m time-of-flight (TOF) tunnel at the Research Center for Nuclear Physics cyclotron facility. For that purpose, we measured neutron energy spectra of the 80-, 100- and 296-MeV proton incident reactions, which had not been investigated in our previous studies. The neutron peak intensity was 0.9-1.1×1010 neutrons/sr/μC in the incident proton energy region of 80-389 MeV, and it was almost independent of the incident proton energy. The contribution of peak intensity of the spectrum to the total intensity integrated with energies above 3 MeV varied between 0.38 and 0.48 in the incident proton energy range of 80-389 MeV. To consider the correction required to derive a response in the peak region from the measured total responses of neutron monitors in the 100-m TOF tunnel, we proposed the subtraction method using energy spectra between 0° and 25°. The normalizing factor k against 25° neutron fluence to equalize it to 0° neutron fluence in the continuum region ranges from 0.74 to 1.02 depending on the incident proton energy and angle measured. Even without the TOF method, the subtraction method with the k factor almost decreases the response in the continuum region of a neutron spectrum against the total response of neutron monitors.

Original languageEnglish
Pages (from-to)50-58
Number of pages9
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume804
DOIs
Publication statusPublished - Dec 21 2015

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neutron spectra
Neutrons
energy spectra
proton energy
neutrons
dosage
Protons
subtraction
tunnels
energy
monitors
fluence
continuums
normalizing
protons
Tunnels
nuclear physics
cyclotrons
Nuclear physics
Cyclotrons

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

Characterization of high-energy quasi-monoenergetic neutron energy spectra and ambient dose equivalents of 80-389 MeV 7Li(p,n) reactions using a time-of-flight method. / Iwamoto, Yosuke; Hagiwara, Masayuki; Satoh, Daiki; Araki, Shouhei; Yashima, Hiroshi; Sato, Tatsuhiko; Masuda, Akihiko; Matsumoto, Tetsuro; Nakao, Noriaki; Shima, Tatsushi; Kin, Tadahiro; Watanabe, Yukinobu; Iwase, Hiroshi; Nakamura, Takashi.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 804, 21.12.2015, p. 50-58.

Research output: Contribution to journalArticle

Iwamoto, Yosuke ; Hagiwara, Masayuki ; Satoh, Daiki ; Araki, Shouhei ; Yashima, Hiroshi ; Sato, Tatsuhiko ; Masuda, Akihiko ; Matsumoto, Tetsuro ; Nakao, Noriaki ; Shima, Tatsushi ; Kin, Tadahiro ; Watanabe, Yukinobu ; Iwase, Hiroshi ; Nakamura, Takashi. / Characterization of high-energy quasi-monoenergetic neutron energy spectra and ambient dose equivalents of 80-389 MeV 7Li(p,n) reactions using a time-of-flight method. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2015 ; Vol. 804. pp. 50-58.
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AU - Iwamoto, Yosuke

AU - Hagiwara, Masayuki

AU - Satoh, Daiki

AU - Araki, Shouhei

AU - Yashima, Hiroshi

AU - Sato, Tatsuhiko

AU - Masuda, Akihiko

AU - Matsumoto, Tetsuro

AU - Nakao, Noriaki

AU - Shima, Tatsushi

AU - Kin, Tadahiro

AU - Watanabe, Yukinobu

AU - Iwase, Hiroshi

AU - Nakamura, Takashi

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AB - We completed a series of measurements on mono-energetic neutron energy spectra of the 7Li(p,n) reaction with 80-389-MeV protons in the 100-m time-of-flight (TOF) tunnel at the Research Center for Nuclear Physics cyclotron facility. For that purpose, we measured neutron energy spectra of the 80-, 100- and 296-MeV proton incident reactions, which had not been investigated in our previous studies. The neutron peak intensity was 0.9-1.1×1010 neutrons/sr/μC in the incident proton energy region of 80-389 MeV, and it was almost independent of the incident proton energy. The contribution of peak intensity of the spectrum to the total intensity integrated with energies above 3 MeV varied between 0.38 and 0.48 in the incident proton energy range of 80-389 MeV. To consider the correction required to derive a response in the peak region from the measured total responses of neutron monitors in the 100-m TOF tunnel, we proposed the subtraction method using energy spectra between 0° and 25°. The normalizing factor k against 25° neutron fluence to equalize it to 0° neutron fluence in the continuum region ranges from 0.74 to 1.02 depending on the incident proton energy and angle measured. Even without the TOF method, the subtraction method with the k factor almost decreases the response in the continuum region of a neutron spectrum against the total response of neutron monitors.

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