Journal
NUCLEAR SCIENCE AND TECHNIQUES
Volume 32, Issue 1, Pages -Publisher
SPRINGER SINGAPORE PTE LTD
DOI: 10.1007/s41365-021-00846-6
Keywords
White neutron source; Nuclear data measurements; Experimental setups; Neutron applications
Categories
Funding
- National Key Research and Development Program of China [2016YFA0401600]
- National Natural Science Foundation of China [11235012, 12035017]
- CSNS Engineering Project
- Back-n Collaboration Consortium fund
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Back-streaming neutrons from the spallation target of the China Spallation Neutron Source were utilized to build a white neutron beam facility, which provides a high-intensity neutron beam with excellent energy spectrum and time resolution. The facility is equipped with advanced spectrometers, detectors, and application utilities, making it suitable for a wide range of applications, particularly neutron-induced cross-sectional measurements.
Back-streaming neutrons from the spallation target of the China Spallation Neutron Source (CSNS) that emit through the incoming proton channel were exploited to build a white neutron beam facility (the so-called Back-n white neutron source), which was completed in March 2018. The Back-n neutron beam is very intense, at approximately 2 x 10(7) n/cm(2)/s at 55 m from the target, and has a nominal proton beam with a power of 100 kW in the CSNS-I phase and a kinetic energy of 1.6 GeV and a thick tungsten target in multiple slices with modest moderation from the cooling water through the slices. In addition, the excellent energy spectrum spanning from 0.5 eV to 200 MeV, and a good time resolution related to the time-of-flight measurements make it a typical white neutron source for nuclear data measurements; its overall performance is among that of the best white neutron sources in the world. Equipped with advanced spectrometers, detectors, and application utilities, the Back-n facility can serve wide applications, with a focus on neutron-induced cross-sectional measurements. This article presents an overview of the neutron beam characteristics, the experimental setups, and the ongoing applications at Back-n.
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