Most papers are machine-translated to English; some are originally in English.
Showing 50 of 164 papers in Physics
In this paper, we propose a novel design for a stationary CT system, termed the Alternating Source-Detector Array stationary CT (ASDA-sCT). The ASDA-sCT system comprises an array of miniature carbon nanotube X-ray sources and a detector array strategically positioned in the gaps between sources. To …
Automatic identification of radioactive isotopes through energy spectrum analysis is vital for remote, unmanned monitoring of radioactive contamination and rapid early warning. In recent years, deep learning methods have advanced significantly, outperforming traditional approaches in recognition acc…
Cosmic-ray muon sources exhibit distinct scattering angle distributions when interacting with materials of different atomic numbers (Z values), facilitating the identification of various Z-class materials, particularly those radioactive high-Z nuclear elements. Most of the traditional identification…
Cancer is the second leading cause of mortality globally. As a critical technological approach in oncology treatment, radiation therapy includes conventional dose rate radiation therapy, high dose rate radiotherapy and ultra-high dose rate radiation therapy (FLASH-RT). With the significant escalatio…
The presence of hydrogen will affect the formation of irradiation defects in reactor structural materials, which in turn will influence the degradation of their mechanical properties. A deeper understanding of the mechanisms behind irradiation effects in structural materials in the presence of hydro…
The ultrahigh-energy-resolution soft X-ray beamline, "Dreamline," at the Shanghai Synchrotron Radiation Facility (SSRF), has been successfully constructed and is now fully operational for conducting angle-resolved photoemission spectroscopy (ARPES) and photoelectron emission microscopy (PEEM) experi…
Benchmark experiments are indispensable for the development of neutron nuclear data evaluation libraries. Given the lack of domestic benchmarking of nuclear data in the fission energy region, this study developed a neutron leakage spectrum measurement system using a spherical sample based on the 252…
We analyze DESI DR2 data with a model-independent method and find that: (a) the expansion of the universe may speed up with a confidence level more than 2.3 $\sigma$ at redshift $z_{51}\in (0.51, 0.955)$; (b) the expansion of the universe may speed down with a confidence level greater than 1.7 $\sig…
We present the preparation and measurement of the radioactive isotope $\rm ^{37}Ar$, which was produced using thermal neutrons from a reactor, as a calibration source for liquid xenon time projection chambers. $\rm ^{37}Ar$ is a low-energy calibration source with a half-life of 35.01 days, making it…
Detector and event visualization are crucial components of high-energy physics (HEP) experimental software. Virtual Reality (VR) technologies and multimedia development platforms such as Unity offer enhanced display effects and flexible extensibility for visualization in HEP experiments. In this stu…
This study investigates the effects of varying tritium breeding materials and their lithium enrichment rates on the Tritium Breeding Ratio (TBR) and Energy Multiplication Factor (M) within the tritium breeding zone of a fusion reactor. The magnetic fusion reactor model was developed based on the geo…
In this study, the neutron radiative capture cross section of 93Nb was measured using the GTAF gamma spectrometer at the Back-n beamline of the China Spallation Neutron Source (CSNS), employing the time-of-flight (TOF) method. A comprehensive data processing approach was implemented, including backg…
This paper presents an algorithm that combines track finding and track fitting, designed for track reconstruction in the Electron-ion Collider in China (EicC). The algorithm's goal is to fulfill the criterion of high track reconstruction efficiency. The algorithm is modularly constructed, leveraging…
High-energy neutron-induced fission data for actinide nuclides form the foundation for the design of advanced nuclear energy systems such as accelerator-driven subcritical systems and fast neutron reactors, playing a vital role in their development. In this study, the INCL++ code is utilized to calc…
To address the well-known "resolution-photon efficiency" trade-off, we developed a lens-coupled X-ray tube-based indirect imaging system incorporating a thick scintillator plate and a large numerical aperture (NA) lens. This configuration provides sufficient photon flux while maintaining theoretical…
Within the framework of the dinuclear system (DNS) model by implementing the cluster transfer into the dissipation process, we systematically investigated the energy spectra and the angular distribution of the preequilibrium clusters (n, p, d, t, $^{3}$He, $\alpha$, $^{6,7}$Li, $^{8,9}$Be) in the ma…
The steam turbine is one of the most critical energy conversion components in power generation systems. Unlike thermal power plants, nuclear steam turbines operate in the wet steam region in most of their stages, with the inlet steam often near saturation, resulting in more severe non-equilibrium co…
For the prompt monitoring of radionuclides released into the atmosphere by various nuclear facilities and sudden nuclear accidents, a nonsampling atmospheric radionuclide online measurement system (NSAROMS) that is based on NaI(Tl) scintillators was developed. Compared with traditional measurement m…
The TM020 mode damped cavity enables compact accelerators but suffers from severe electromagnetic field leakage due to coupling-slot misalignment and structural asymmetry. We propose an integrated narrowband filter based on RLC circuit design to selectively suppress TM020 leakage while preserving hi…
We present a new method for structural sequence analysis grounded in Algorithmic Information Theory (AIT). At its core is the Ladderpath approach, which extracts nested and hierarchical relationships among repeated substructures in linguistic sequences---an instantiation of AIT’s principle of descri…
Boron neutron capture therapy (BNCT) is an advanced targeted radiotherapy that exploits the high affinity of the 10B nucleus for capturing neutrons. This therapy involves the use of neutron beams in combination with boron compounds, which preferentially accumulate in cancer cells. Recent advancement…
To mitigate dark pulses and achieve low-background-level measurements, liquid scintillation counters (LSCs) are generally equipped with two or three photomultiplier tubes (PMTs) for coincidence measurements. However, traditional identification methods in LSC only utilize the anode pulse from a singl…
Accurate velocity determination of stored ions in storage rings plays a key role for nuclear mass measurements using the technique of B$\rho$-defined isochronous mass spectrometry (Bρ-IMS). However, the accuracy and precision of the ion's velocity are seriously deteriorated by the non-isochonicity o…
Accurate calibration of the beam phase (the phase of beam arrival relative to the cavity accelerating field) is essential for maintaining the stability and efficiency of linear accelerators. Conventional offline phase-scan methods, typically performed during commissioning or maintenance, require con…
In current work, the fission property of $^{180}$Hg is investigated based on the Skyrme density functional theory (DFT). The impact of the high-order hexadecapole moment (q${40}$) is found at large deformations. With the q$$Hg is further reproduced by the time-dependent generator coordinate method (…
Leakage neutron spectra from a pure 238U slab sample (dimensions: 100 mm × 100 mm × 20 mm) bombarded by broad-spectrum neutrons were measured at 0° using the time-of-flight method. The experiment was carried out at the Radioactive Ion Beam Line of the Heavy Ion Research Facility in Lanzhou at the In…
We present the results of an experiment conducted to measure cosmic-ray muons and muon-induced fluxes at the China Jinping Underground Laboratory. Utilizing a 28-liter 0.5% gadolinium-doped liquid scintillator detector, which operated stably for 412 days in a 1-meter-thick polyethylene shielding, we…
As the key technology of space exploration, space power has always been a research interest of international researchers. A lot of research work has been carried out around the world for the space nuclear reactor using heat pipe, liquid metal and gas cooling method. With the development of molten sa…
A new Monte Carlo optimization (MCO) method named Hybrid Adaptive Response Surface Methodology Genetic Algorithm (RSM-GA) Monte Carlo Optimization (HRG-MCO) is proposed to address the strong empirical dependence and low efficiency of global multi-parameter optimization in traditional neutronics desi…
The focusing of pulsed neutrons can increase neutron flux, reduce sample volume, and enable access to smaller scattering angles. Consequently, it represents a critical challenge for next-generation spallation neutron sources. The primary difficulty stems from the inherent chromatic aberration of whi…
Due to its excellent heat transfer performance and compact structure, the printed circuit heat exchanger (PCHE) has become the mainstream heat exchange equipment between the secondary circuit of the supercritical carbon dioxide Brayton cycle and the primary circuit of the lead-cooled fast reactor. D…
In this work, we report a scintillator used for neutron/gamma discrimination, which consists of a polyvinyltoluene matrix loaded with monomers of dimethoxydiphenylsilane (DDS), and fluor dyes, namely 2,5-diphenyloxazole and 7-diethylamino-4-methylcoumarin as the primary fluorophore and wavelength-sh…
Cs2LiYCl6: Ce (CLYC) scintillator is sensitive to neutrons within a wide-energy range and has the potential to achieve wide-range neutron energy spectrum measurements. The direct neutron detection performance of a CLYC detector has been realized by utilizing the Back-n white neutron source at China …
This study investigates neutron differential scattering cross sections off even Gadolinium isotopes (Gd-156, Gd-158, Gd-160) at various energies (1.5, 2.5, 4.1 and 7 MeV), comparing theoretical calculations with evaluations from prominent nuclear data libraries (ENDF/B-VIII.0, JENDL-5 and EXFOR) and…
For over six decades, the violation of parity symmetry has been treated as a foundational fact of modern physics. This article re-examines that conclusion and argues that parity was never violated—because it was never physically there to begin with. Through a structural analysis of the 1957 Wu exper…
The process of nuclear fusion in the presence of a laser field is analyzed theoretically. The analysis is applicable to most fusion reactions and different kinds of currently available intense lasers, from X-ray free electron lasers to solid-state near-infrared lasers. Laser fields are shown to enha…
The PandaX-4T liquid xenon detector uses Hamamatsu 3-inch R11410-23 photomultiplier tubes (PMTs) as the light sensors for ultra-low radioactivity, high quantum efficiency, and long-term stability at cryogenic temperature. Each PMT was thoroughly tested in a dedicated chamber before being installed i…
In high-energy physics~(HEP) experiments, visualization software plays a pivotal role in detector design, offline software development, and event data analysis. The visualization tools integrate detailed detector geometry with complex event data models, providing the researchers with invaluable insi…
In the synthesis of new superheavy nuclei, the various long half-lives of Pu and Cm isotopes render them promising as target materials for the fusion reactions. An investigation into the isotopic dependence of the actinide targets is important to select optimal reaction systems. Based on the dinucle…
Based on the Generalized reduced R-matrix theory, the RAC program (R-matrix analysis code) is used to analyze the experimental data of all the nuclear reaction channels related to the 5He system. The current calculations provide accurate and reliable evaluation data, and are in good agreement with t…
A silicon microstrip detector (SSD) has been developed to have state of the art spatial resolution and a large sensitive area under stringent power constraints. The design incorporates three floating strips with their bias resistors inserted between two aluminum readout strips. Beam test measurement…
Cryogenic modules are key equipment systems in SHINE. To achieve a high quality factor Q0 for the superconducting cavities in cryogenic modules, it is essential to create a low-magnetic-field operating environment. Efficient magnetic shielding for superconducting cavities effectively shields against…
Cosmic-ray muon sources exhibit distinct scattering angle distributions when interacting with materials of different atomic numbers (Z values), facilitating the identification of various Z-class materials, particularly those radioactive high-Z nuclear elements. Most of the traditional identification…
Polarization-analyzed small-angle neutron scattering (PASANS) is an advanced technique that enables the selective investigation of magnetic scattering phenomena in magnetic materials and distinguishing coherent scattering obscured by an incoherent background, making it particularly valuable for cutt…
Spot-scanning carbon ion radiotherapy relies on ripple filters (RiFi) to enhance treatment efficiency. Existing multi-layer metallic mesh ripple filters (mRiFi) employ random stacking configurations, resulting in poor dose distribution consistency. This study designed three-dimensional mRiFi matrice…
The Shanghai High repetition rate XFEL and Extreme light facility (SHINE) utilizes high-Q 1.3 GHz superconducting radio-frequency (SRF) cavities for particle acceleration. These cavities, with an ultra-narrow bandwidth of approximately 32 Hz, are highly susceptible to Lorentz force detuning (LFD) an…
Due to its excellent heat transfer performance and compact structure, the printed circuit heat exchanger (PCHE) has become the mainstream heat exchange equipment between the secondary circuit of the supercritical carbon dioxide Brayton cycle and the primary circuit of the lead-cooled fast reactor. D…
The 28nm process has a high cost-performance ratio and has gradually become the standard for the fieldof radiation-hardened devices. However, owing to the minimum physical gate length of only 35nm, the physicalarea of a standard 6T SRAM unit is approximately 0.16 μm2, resulting in a significant enha…
This paper demonstrates, through experiments on the relative motion of coils and magnets and through case analyses of numerous electromagnetic interactions, that Weber's original viewpoint on unipolar induction is correct. Furthermore, the experimental analysis also indicates that, compared with the…
The helium bubbles induced by 14 MeV neutron irradiation can cause intergranular fractures in reduced activation ferritic martensitic (RAFM) steel, which is a candidate structural material for fusion reactors. In order to elucidate the susceptibility of different grain boundaries (GBs) to helium-ind…
