Neutron beam filter system for fast neutron cross-section measurement at the ANNRI beamline of MLF/J-PARC

Rovira, Gerard; Kimura, A.; Nakamura, Shôji; Endo, Shunsuke; Iwamoto, Osamu; Iwamoto, Nobuyuki; Katabuchi, Tatsuya; Terada, Kikuo; Kodama, Yu; Nakano, Hisashi; Hori, Jun‐ichi; Shibahara, Yuji

doi:10.1016/j.nima.2021.165318

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…To solve the double-pulse beam issue in J-PARC/MLF, a neutron beam filter system has been developed and installed into the Accurate Neutron Nucleus Reaction Measurement Instrument (ANNRI) [7]. The neutron beam filter technique has been often used in nuclear reactors, to make a mono-energetic neutron beam [8,9].…”

Section: Methodsmentioning

confidence: 99%

“…The neutron filter materials were fabricated and tested in neutron beam experiments at J-PARC. In the test experiments, transmission neutron spectra were measured by detecting prompt rays from the 10 B(n,) 7 Li reaction placing a boron sample at the sample position. The 478-keV -rays from the 10 B(n,) 7 Li reaction were detected with a NaI(Tl) detector.…”

Section: Methodsmentioning

confidence: 99%

“…In the test experiments, transmission neutron spectra were measured by detecting prompt rays from the 10 B(n,) 7 Li reaction placing a boron sample at the sample position. The 478-keV -rays from the 10 B(n,) 7 Li reaction were detected with a NaI(Tl) detector. Figures 3 and 4 show neutron TOF spectra for 20-cm thick Fe filter and 20-cm thick Si filter, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Fast-neutron capture cross section data measurement of minor actinides for development of nuclear transmutation systems

Katabuchi

Iwamoto²,

Hori³

et al. 2023

EPJ Web Conf.

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The neutron capture cross sections of 237Np, 243Am and 241Am in the keV energy region were measured by the time-of-flight method at the Japan Proton Accelerator Research Complex (J-PARC). Characterization of the minor actinide samples were made to reduce the uncertainties of the cross section. A neutron beam filter system was developed and installed in ANNRI to solve the double-bunch mode issue of J-PARC. The pulse-height weighting technique was employed to determine the neutron capture cross sections. The neutron capture cross sections of 237Np, 243Am and 241Am were determined with higher accuracies than the past experiments.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Fast-neutron capture cross section data measurement of minor actinides for development of nuclear transmutation systems

Katabuchi

Iwamoto²,

Hori³

et al. 2023

EPJ Web Conf.

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“…The highly radioactive sample (1 GBq) was produced by implantation of a 7 Be ion beam at the neighbouring ISOLDE facility [22]. The 7 Be(n, α) 4 He cross section was measured in the 10 meV to 10 keV neutron energy range using two 7 Be samples with an even larger total activity of 36 GBq. Each sample was set-up in a sandwich configuration with two 140 μm-thick Si-detectors placed directly in-beam [21].…”

Section: Neutron-induced Charged-particle Emission Experiments For Bi...mentioning

confidence: 99%

“…There exist several neutron time-of-flight (TOF) facilities in the world devoted to such measurements. The most active in the recent years are GELINA at JRC-Geel [1] and CERN n TOF [2] in Europe, LANSCE [3] in the USA, ANNRI [4] at J-PARK in Japan and CSNS Back-n [5] in China. This contribution presents a brief summary and update on latest experiments at CERN n TOF.…”

Section: Introductionmentioning

confidence: 99%

The neutron time-of-flight facility n_TOF at CERN Recent facility upgrades and detector developments

Domingo-Pardo,

Aberle,

Alcayne

et al. 2023

J. Phys.: Conf. Ser.

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Based on an idea by Carlo Rubbia, the n_TOF facility at CERN has been operating for over 20 years. It is a neutron spallation source, driven by the 20 GeV/c proton beam from the CERN PS accelerator. Neutrons in a very wide energy range (from GeV, down to sub-eV kinetic energy) are generated by a massive Lead spallation target feeding two experimental areas. EAR1, horizonal with respect to the proton beam direction is set at 185 meters from the spallation target. EAR2, on the vertical line from the spallation source, is placed at 20 m. Neutron energies for experiments are selected by the time-of-flight technique (hence the name n_TOF), while the long flight paths ensure a very good energy resolution. Over one hundred experiments have been performed by the n_TOF Collaboration at CERN, with applications ranging from nuclear astrophysics (synthesis of the heavy elements in stars, big bang nucleosynthesis, nuclear cosmo-chronology), to advanced nuclear technologies (nuclear data for applications, nuclear safety), as well as for basic nuclear science (reaction mechanisms, structure and decay of highly excited compound states). During the planned shutdown of the CERN accelerator complex between 2019 and 2021, the facility went through a substantial upgrade with a new target-moderator assembly, refurbishing of the neutron beam lines and experimental areas. An additional measuring and irradiation station (the NEAR Station) has been envisaged and its capabilities for performing material test studies and new physics opportunities are presently explored. An overview of the facility and of the activities performed at CERN is presented in this contribution, with a particular emphasis on the most relevant experiments for nuclear astrophysics.

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General-purpose Nuclear Data Library JENDL-5 and to the Next

Iwamoto

Kunieda

et al. 2023

EPJ Web of Conf.

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Neutron beam filter system for fast neutron cross-section measurement at the ANNRI beamline of MLF/J-PARC

Cited by 6 publications

References 17 publications

Fast-neutron capture cross section data measurement of minor actinides for development of nuclear transmutation systems

Fast-neutron capture cross section data measurement of minor actinides for development of nuclear transmutation systems

The neutron time-of-flight facility n_TOF at CERN Recent facility upgrades and detector developments

General-purpose Nuclear Data Library JENDL-5 and to the Next

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