Characterization of a 40–90 MeV 7Li(p,n) neutron source at TIARA using a proton recoil telescope and a TOF method

Baba, Mamoru; Nauchi, Yasushi; Iwasaki, Tomohiko; Kiyosumi, Takehide; Yoshioka, M.; Matsuyama, S.; Hirakawa, Naohiro; Nakamura, Takashi; Tanaka, Shohei; Meigo, Shin-ichiro; Nakashima, Hiroshi; Nakao, Noriaki

doi:10.1016/s0168-9002(99)00161-8

Cited by 78 publications

(34 citation statements)

References 32 publications

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“…There are several high-energy neutron facilities in Japan, which have been used in many studies, including nuclear data measurements and shielding benchmark experiments. High-energy neutron fields at cyclotron facilities TIARA 24) and CYRIC 25) are promising candidates for standard fields and comparison studies are currently being conducted between these two facilities.…”

Section: Discussionmentioning

confidence: 99%

Recent activities on neutron standardization in Japan

Harano

Matsumoto

Nishiyama

et al. 2011

Progress in Nuclear Science and Technology

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NMIJ provides national standards on neutron fluence as well as neutron emission rate in Japan. The neutron fluence standards are established for thermal neutrons, monoenergetic neutrons at seven energies from 24 keV to 14.8 MeV, radionuclide-source neutrons from 252 Cf and 241 Am-Be. The neutron emission standards are provided for these radionuclide sources. These are basically prepared in accordance with ISO 8529-1. Worldwide consistency of the standards has been supported by participating in key comparisons organized by BIPM. NMIJ issues calibration certificates accepted worldwide within the range specified in our calibration and measurement capabilities listed in the BIPM web page. The development of the 19 MeV neutron field is in progress to complete standardization in 2011. The radionuclide-source neutron fluence standards were extended in 2008 so that calibrations are also available in terms of ambient/personal dose equivalent. The Japan calibration service system has launched to improve the traceability of neutron measurement in Japan. A new thermal neutron calibration field is developing with a guided beam at the research reactor JRR-3M of JAEA. Aiming at the establishment of the 20-100 MeV high-energy neutron standard, comparison studies are currently being conducted between the cyclotron facilities TIARA of JAEA and CYRIC of the Tohoku University.

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Section: Discussionmentioning

confidence: 99%

Recent activities on neutron standardization in Japan

Harano

Matsumoto

Nishiyama

et al. 2011

Progress in Nuclear Science and Technology

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“…(A11) are very small too because of the simple geometries involved, the small uncertainties on the scattering angles of the detected particles and of the very well known QED cross sections involved. All these considerations make the method to obtain radiative corrected spectra described in this Appendix even much more reliable of the formally similar and widely used method of determing neutron spectra from the proton recoil energy measurement (see for example [32,33]), that is affected by sometimes not negligible uncertanties on the measured recoil proton energy (and consequently on the experimental spectrum) and on the detector function that depends on the geometry (and on the connected problem of the determination of the scattering angle of the detected proton) and on the degree of knowledge of the differential n -p scattering cross section. 12 Λ B were detected by the High Resolution Spectrometer (HRS) electron arm and by the HRS hadron arm, respectively, while the primary electrons were provided by the CEBAF accelerator.…”

Section: Eq (A8) Means Thatmentioning

confidence: 99%

Spectroscopy ofLiΛ9by electroproduction

Urciuoli¹,

Cusanno²,

Marrone³

et al. 2015

Phys. Rev. C

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Background: In the absence of accurate data on the free two-body hyperon-nucleon interaction, the spectra of hypernuclei provides information on the details of the effective hyperon-nucleon interaction.Purpose: To obtain a high-resolution binding energy spectrum for the 9 Be(e, e ′ K + ) 9 Λ Li reaction. Method: Electroproduction of the hypernucleus 9 Λ Li has been studied for the first time with sub-MeV energy resolution in Hall A at Jefferson Lab on a 9 Be target. In order to increase the counting rate and to provide unambiguous kaon identification, two superconducting septum magnets and a Ring Imaging CHerenkov detector (RICH) were added to the Hall A standard equipment. Results: The cross section to low-lying states of 9 Λ Li is concentrated within 3 MeV of the ground state and can be fitted with four peaks. The positions of the doublets agree with theory while a disagreement could exist with respect to the relative strengths of the peaks in the doublets. The Λ separation energy, BΛ, of 8.36 ± 0.08 (stat.) ± 0.08 (syst.) MeV was measured, in agreement with an earlier experiment.

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“…This facility offers QMN beams with peak energies in the range of 40-90 MeV (17) . The interval between beam pulses ranges from 45 to 90 ns, depending on the proton energy.…”

Section: Tiara 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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Characterization of a 40–90 MeV 7Li(p,n) neutron source at TIARA using a proton recoil telescope and a TOF method

Cited by 78 publications

References 32 publications

Recent activities on neutron standardization in Japan

Recent activities on neutron standardization in Japan

Spectroscopy ofLiΛ9by electroproduction

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

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