Nuclear Science and Techniques
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Flow field effect of delayed neutron precursors in liquid-fueled molten salt reactors
Nuclear Science and Techniques - Tập 33 - Trang 1-17 - 2022
In molten salt reactors (MSRs), the liquid fuel salt circulates through the primary loop and a part of the delayed neutron precursors (DNPs) decays outside the reactor core. To model and analyze the flow field effect of DNPs in channel-type liquid-fueled MSRs, a three-dimensional space-time dynamics code, named ThorCORE3D, that couples neutronics, core thermal-hydraulics, and a molten salt loop sy......
Imaging internal density structure of the Laoheishan volcanic cone with cosmic ray muon radiography
Nuclear Science and Techniques - Tập 33 - Trang 1-10 - 2022
Muon radiography is a promising technique for imaging the internal density structures of targets such as tunnels, pyramids, and volcanoes up to a scale of a few hundred meters by measuring the flux attenuation of cosmic ray muons after they have traveled through these targets. In this study, we conducted experimental muon radiography of one of the volcanoes in the Wudalianchi area in Northeast Chi......
Effect of source size and emission time on the p–p momentum correlation function in the two-proton emission process
Nuclear Science and Techniques - Tập 31 - Trang 1-6 - 2020
The effect of source size and emission time on the proton–proton (p–p) momentum correlation function ($$C_\mathrm{pp}(q)$$) has been studied systematically. Assuming a spherical Gaussian source with space and time profile according to the function $$S(r,t)\sim \exp (-r^2/2r_{0}^{2}-t/\tau )$$ in the correlation function calculation code (CRAB), the results indicate that one $$C_\mathrm{pp}(q)$$ di......
A cathodic arc enhanced middle-frequency magnetron sputter system for deposition of hard protective coatings
Nuclear Science and Techniques - Tập 17 - Trang 135-138 - 2006
Simulation study on cosmic ray background at large zenith angle based on GRANDProto35 coincidence array experiment
Nuclear Science and Techniques - Tập 32 - Trang 1-11 - 2021
Neutrino detection in the 100 PeV energy region is the ultimate means of studying the origin of ultra-high-energy cosmic rays, in which the large radio detection array giant radio array for neutrino detection (GRAND) project aims to use to decipher this century-old problem. The GRANDProto35 compact array is a microform of 35 radio prototype detectors for the GRAND experiment, which verifies the re......
ADS Injector-I 2 K superfluid helium cryogenic system
Nuclear Science and Techniques - Tập 31 - Trang 1-14 - 2020
The Accelerator Driven Sub-critical (ADS) system is a strategic plan to solve the nuclear waste problem for nuclear power plants in China. High-energy particle accelerators and colliders contain long strings of superconducting devices, superconducting radio frequency cavities, and magnets, which may require cooling by 2 K superfluid helium (Helium II). 2 K superfluid helium cryogenic system has be......
Theoretical prediction of radiation-enhanced diffusion behavior in nickel under self-ion irradiation
Nuclear Science and Techniques - Tập 31 - Trang 1-11 - 2020
The enhanced diffusion in materials under irradiation plays an important role in the long-term microstructural evolution. In this work, the self-ion irradiation in nickel was used as a model system to study the effect of radiation-enhanced diffusion on the implanted ion profiles. Initially, the depth profiles of vacancies and implanted ions for nickel self-ion irradiation with ion energies up to 1......
2.856 GHz microwave signal extraction from mode-locked Er-fiber lasers with sub-100 femtosecond timing jitter
Nuclear Science and Techniques - Tập 29 - Trang 1-6 - 2018
A balanced optical microwave phase detector (BOMPD) based on a 3 × 3 coupler is presented. This system was developed to extract ultra-low-jitter microwave signals from optical pulse trains emitted by mode-locked Er-fiber lasers, and synchronized microwave and laser systems. We demonstrate that the BOMPD achieves a precision of synchronization of less than 100 femtosecond of timing jitter. The expe......
Signal modeling and impulse response shaping for semiconductor detectors
Nuclear Science and Techniques - Tập 33 - Trang 1-11 - 2022
The output-signal models and impulse response shaping (IRS) functions of semiconductor detectors are important for establishing high-precision measurement systems. In this paper, an output-signal model for semiconductor detector systems is proposed. According to the proposed model, a multistage cascade deconvolution IRS algorithm was developed using the C-R inverse system, R-C inverse system, and ......
Investigation of photon energy absorption properties for some biomolecules
Nuclear Science and Techniques - Tập 30 - Trang 1-9 - 2019
The mass energy absorption coefficient (
$$\mu _{\mathrm{en}}/\rho$$
), effective atomic number (
$$Z_{\mathrm{PEA}_{\mathrm{eff}}}$$
......
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