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Energy resolution of pulsed neutron beam provided by the ANNRI beamline at the J-PARC/MLF

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Title: Energy resolution of pulsed neutron beam provided by the ANNRI beamline at the J-PARC/MLF
Authors: Kino, K. Browse this author
Furusaka, M. Browse this author
Hiraga, F. Browse this author
Kamiyama, T. Browse this author
Kiyanagi, Y. Browse this author
Furutaka, K. Browse this author
Goko, S. Browse this author
Hara, K. Y. Browse this author
Harada, H. Browse this author
Harada, M. Browse this author
Hirose, K. Browse this author
Kai, T. Browse this author
Kimura, A. Browse this author
Kin, T. Browse this author
Kitatani, F. Browse this author
Koizumi, M. Browse this author
Maekawa, F. Browse this author
Meigo, S. Browse this author
Nakamura, S. Browse this author
Ooi, M. Browse this author
Ohta, M. Browse this author
Oshima, M. Browse this author
Toh, Y. Browse this author
Igashira, M. Browse this author
Katabuchi, T. Browse this author
Mizumoto, M. Browse this author
Hori, J. Browse this author
Keywords: Pulsed neutron beam
Neutron energy resolution
Neutron capture cross-section
Issue Date: 1-Feb-2014
Publisher: Elsevier science bv
Journal Title: Nuclear instruments & methods in physics research section a-accelerators spectrometers detectors and associated equipment
Volume: 736
Start Page: 66
End Page: 74
Publisher DOI: 10.1016/j.nima.2013.09.060
Abstract: We studied the energy resolution of the pulsed neutron beam of the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) at the Japan Proton Accelerator Research Complex/Materials and Life Science Experimental Facility (J-PARC/MLF). A simulation in the energy region from 0.7 meV to 1 MeV was performed and measurements were made at thermal (0.76-62 meV) and epithermal energies (4.8-410 eV). The neutron energy resolution of ANNRI determined by the time technique depends on the Lime structure of the neutron pulse. We obtained the neutron energy resolution as a function of the neutron energy by the simulation in the two operation modes of the neutron source: double- and single bunch modes in double bunch mode, the resolution deteriorates above about 10 eV because the time structure of the neutron pulse splits into two peaks. The time structures at 13 energy points from measurements in the thermal energy region agree with those of the simulation. In the epithermal energy region, the time structures at 17 energy points were obtained from measurements and agree with those of the simulation. The FWHM values of the time structures by the simulation and measurements were found to be almost consistent. In the single-bunch mode, the energy resolution is better than about 1% between 1 meV and 10 keV at a neutron source operation of 17.5 kW. These results confirm the energy resolution of the pulsed neutron beam produced by the ANNRI beamline. (C) 2013 Elsevier B.V. All rights reserved.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 木野 幸一

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