Quasi-monoenergetic neutron energy spectra for 246 and 389MeV 7Li(p,n) reactions at angles from 0° to 30°

Iwamoto, Yosuke; Hagiwara, Masayuki; Satoh, Daiki; Iwase, Hiroshi; Yashima, Hiroshi; Itoga, Toshiro; Sato, Tatsuhiko; Nakane, Yoshibumi; Nakashima, Hiroshi; Sakamoto, Yukio; Matsumoto, Tadao; Masuda, Akihiko; Nishiyama, Jun; Tamii, A.; Hatanaka, K.; Theis, Christian; Feldbaumer, Eduard; Jaegerhofer, L.; Pioch, Christian; Mares, V.; Nakamura, Takashi

doi:10.1016/j.nima.2010.12.022

Cited by 25 publications

(18 citation statements)

References 26 publications

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“…In order to calibrate the BSS, 246 MeV and 389 MeV proton beams were used at the RCNP cyclotron facility in Osaka, Japan, to generate quasi-monoenergetic neutron fields with peak energies of 244 and 387 MeV via 7 Li(p,n) 7 Be reactions. To characterize these neutron fields in the energy range from 10 MeV to the nominal maximum energies, a TOF measurement was carried out applying liquid organic scintillators NE213 [21]. The low-energy part of the neutron spectra, including a small thermal and an evaporation peak, were accurately determined by the BSS measurements using the MSANDB unfolding code [25,26] and the three calculated response matrices.…”

Section: Discussionmentioning

confidence: 99%

“…However, the resolution chosen for calibration of the BSS was ten bins per decade since a much larger range down to meV needed to be covered. Therefore, -5 -2011 JINST 6 P10015 [21]. The dashed lines show the same spectra re-binned to a resolution of ten bins per decade.…”

Section: Time-of-flight Measurementsmentioning

confidence: 99%

“…Additionally, the insets in figures 5 and 6 show the spectra in lethargy representation. For comparison, the results of the TOF measurements for both beam energies and zero degree emission are also included [21] (red lines in figures 5 and 6).…”

Section: Unfolded Bss Neutron Spectra and Comparison With Tof Spectramentioning

confidence: 99%

“…Nonetheless, this value is expected to give a reasonable estimate for the systematic uncertainty involved in the BSS measurements presented in this work. The error bars shown in figure 10 predominantly reflect the systematic uncertainty of 15% involved in the TOF measurements [21] and the systematic uncertainty of 5% involved in BSS measurements. It is obvious from figure 10 that the calculated count rates using the highest response functions in the high-energy region, i.e.…”

Section: "mentioning

confidence: 99%

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Calibration of a Bonner sphere spectrometer in quasi-monoenergetic neutron fields of 244 and 387 MeV

et al. 2011

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This paper describes the results of calibration measurements for a Bonner sphere spectrometer (BSS) with 3 He proportional counter performed in quasi-monoenergetic neutron fields at the Research Center for Nuclear Physics (RCNP) at the University of Osaka, Japan. Using 246 MeV and 389 MeV proton beams, neutron fields with nominal peak energies of 244 MeV and 387 MeV were generated via 7 Li(p,n) 7 Be reactions. At high energies, the neutron spectra were measured by means of the time-of-flight (TOF) method. The low-energy part of the neutron spectra were determined by BSS measurements down to thermal energies using the MSANDB unfolding code and three different sets of response functions. These were obtained by means of Monte Carlo (MC) calculations including various codes and intra-nuclear cascade (INC) models. Unfolded BSS fluence rates were additionally confirmed by GEANT4 calculations. For calibration of the BSS, measured count rates were corrected for low-energy contributions and compared with count rates calculated using TOF data and various response functions. In addition, measured response values were compared with mono-energetic response calculations, and best agreement was found with GEANT4 results using the Bertini INC model.

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Section: Discussionmentioning

confidence: 99%

Section: Time-of-flight Measurementsmentioning

confidence: 99%

Section: Unfolded Bss Neutron Spectra and Comparison With Tof Spectramentioning

confidence: 99%

Section: "mentioning

confidence: 99%

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Calibration of a Bonner sphere spectrometer in quasi-monoenergetic neutron fields of 244 and 387 MeV

et al. 2011

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“…Since the target can be moved to different positions within the swinger magnet neutron beam angles of up to 308 can be delivered. The experimental tunnel has a length of 100 m, which enables precise measurements of energy distributions by the time-of-flight method (20) . The potential as a high-energy neutron reference field has been investigated for proton beams with energies of 140, 250, 350 and 392 MeV.…”

Section: Rcnp Japanmentioning

confidence: 99%

High-energy quasi-monoenergetic neutron fields: existing facilities and future needs

Pomp

Bartlett²,

Mayer

et al. 2013

Radiation Protection Dosimetry

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The argument that well-characterised quasi-monoenergetic neutron (QMN) sources reaching into the energy domain >20 MeV are needed is presented. A brief overview of the existing facilities is given, and a list of key factors that an ideal QMN source for dosimetry and spectrometry should offer is presented. The authors conclude that all of the six QMN facilities currently in existence worldwide operate in sub-optimal conditions for dosimetry. The only currently available QMN facility in Europe capable of operating at energies >40 MeV, TSL in Uppsala, Sweden, is threatened with shutdown in the immediate future. One facility, NFS at GANIL, France, is currently under construction. NFS could deliver QMN beams up to about 30 MeV. It is, however, so far not clear if and when NFS will be able to offer QMN beams or operate with only so-called white neutron beams. It is likely that by 2016, QMN beams with energies >40 MeV will be available only in South Africa and Japan, with none in Europe.Neutron sources are used and neutron radiation fields are generated in various scientific research areas and applications. Examples include radiation therapy, radionuclide production, material science studies, design of electronic components and energy production. High-energy neutrons are the dominant component of the prompt radiation field present outside the shielding of high-energy accelerators and are a significant component of the cosmic radiation fields in aircraft and in spacecraft. In radiotherapy using highenergy medical accelerators, high-energy neutrons are a secondary component of the fields in the beam delivery system and in the patient's body. The energy range of neutrons in these fields extends from thermal energies to several GeV. High-energy neutron fields are gaining more attention owing to the increasing number of high-energy accelerators in research and medicine, and the special consideration given to the occupational exposure to cosmic radiation. In order to study the physics of neutron interactions in these applications, in particular concerning dosimetry, radiation protection monitoring of workplaces, and radiation effects in electronics, especially those used in aircraft and in spacecraft, well-characterised neutron fields for high energies are needed.In medical applications, using high-energy photons and ion beams for cancer treatment, one must consider the contribution of secondary neutrons to organs in the human body outside the target area (1,2) .The neutron exposure of staff has to be included in the design and operation of the facility: the contribution of fast neutrons outside of the shielding was for a long time underestimated. In the environment outside the primary beam the neutron contribution to human radiation exposure can dominate, and neutrons with energies .10-20 MeV account for up to 50 % of the ambient dose equivalent. Dosimetry for exposures to cosmic radiation in aircraft is specified in International Organization for Standardization (ISO) standards, see for example ref. (3), and a compilation ...

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Measurements and Monte Carlo calculations of forward-angle secondary-neutron-production cross-sections for 137 and 200MeV proton-induced reactions in carbon

Iwamoto

Hagiwara

Matsumoto

et al. 2012

Nuclear Instruments and Methods in Physics Research Section A:

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Quasi-monoenergetic neutron energy spectra for 246 and 389MeV 7Li(p,n) reactions at angles from 0° to 30°

Cited by 25 publications

References 26 publications

Calibration of a Bonner sphere spectrometer in quasi-monoenergetic neutron fields of 244 and 387 MeV

Calibration of a Bonner sphere spectrometer in quasi-monoenergetic neutron fields of 244 and 387 MeV

High-energy quasi-monoenergetic neutron fields: existing facilities and future needs

Measurements and Monte Carlo calculations of forward-angle secondary-neutron-production cross-sections for 137 and 200MeV proton-induced reactions in carbon

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