Automatically translated preprints from the Chinese arXiv (ChinaXiv).
Showing 50 of 137 papers in Physics
The Cerenkov detector has a distinct advantage in constructing the reaction vertex and incident direction of energetic particles, enabling the identification of emission sources. We propose a novel approach to measure neutrino sources by employing a modular photomultiplier tube (PMT) array, utilizin…
Accurate atomic mass data hold significant application value in various research fields, in which Penning Trap mass spectrometry is considered the most precise experimental method. A cryogenic detection system is a key component for reading out the image charge of charged particles in Penning traps …
A first attempt to simulate the charge exchange process from C2+ to C- using the Monte Carlo software Geant4 has been accomplished, modeling low-energy C2+ ions passing through an exchange medium. The yields of Cq (q=-2, -1, 0, and +1) from injected C2+ with different energies into different exchang…
Neutron-rich boron, carbon, and nitrogen isotopes have garnered extensive experimental and theoretical interest. In the present work, we conducted a comprehensive study for these nuclei utilizing ab initio valence-space in-medium similarity renormalization group calculations with chiral nucleon-nucl…
The neutron yields induced by 500 MeV/u 4He ions bombarding a thick uranium target have been measured by the time-of-flight method at Heavy Ion Research Facility in Lanzhou. Simulations employing three Monte Carlo codes, GEANT4, FLUKA, and PHITS, were performed to calculate neutron yields under cond…
The energy response of an imaging detector based on a monolithic crystal is highly dependent on the position of the gamma ray interaction, which leads to a spectral drift of the imaging detector, known as the spectral drift related to incident position. It deteriorates the energy resolution of the d…
A novel experimental setup with spatially separated magnetic and electrostatic fields is proposed for proton and deuteron electric dipole moment (EDM) studies. The lattice design, which employs a spin compensator to achieve the "quasi-frozen" spin condition for precise measurements, demonstrates ada…
CT images provide medical practitioners with a scientific and intuitive rationale for the diagnosis of clinical diseases. The Internet of Medical Things (IoMT) and telemedicine facilitate the preservation, transmission, and application of medical data, driving the sharing of medical data, especially…
The vapor diffusion and transport resulting from steam generator tube rupture (SGTR) accidents are a majorconcern threatening lead-based reactor core safety. In this study, a high-parameter SGTR experimental platformand the multiphase multi-physics processes numerical simulation were developed to in…
DAYU3D is a modern three-dimensional (3D) computer code for thermal-hydraulic design and accident analysis in high temperature gas-cooled reactors (HTGRs), developed by the Institute of Nuclear and New Energy Technology (INET) at Tsinghua University. Compared to the traditional codes like TINTE, the…
A new multi-detector array named HALIMA (Hybrid Array for LIfetime MeAsurement) has been developed at Lanzhou, for nuclear structure studies in fission. The array comprises eight BGO-shielded High-Purity Germanium (HPGe) detectors and twenty fast Ce-doped Lanthanum Bromide [LaBr3(Ce)] detectors shie…
The full configuration interaction quantum Monte Carlo (FCIQMC) method, originally developed in quantum chemistry, has also been successful in both molecular and condensed matter systems. Another natural extension of this methodology would be its application to nuclear structure calculations. We hav…
Exploring the limits of neutron binding in atomic nuclei remains a central focus of nuclear physics. However, the experimental determination of the neutron drip line is challenging because of the minuscule production cross sections of the most neutron-rich isotopes. We investigated the effectiveness…
The tensor force changes the nuclear shell structure, and thus may result in underlying influence the collectivity and decay properties of the nucleus. We carefully examined the impact of the monopole and multipole effects originating from the tensor force on both the collectivity and the matrix ele…
The molten salt reactor, one of the six fourth-generation reactor types, employs liquid nuclear fuel and graphite as a moderator. Graphite also serves as a core structural component, forming fuel salt channels in a honeycomb-like configuration. To ensure effective core design management and nuclear …
The neutron excess effect, originating from the vanishing of one part of (\bm{\tau}\text{1} \cdot \bm{\tau}\text{2}) operator matrix elements, was appropriately considered within the Skyrme-type $\Lambda N N$ three-body interactions and applied to the deformed SHF model. Analysis of a broad range of…
Using Kolmogorov-Arnold Networks (KANs), we construct a holographic model informed by lattice QCD data. This neural network approach enables the derivation of an analytical solution for the deformation factor $w(r)$ and the determination of a constant $g$ related to the string tension. Within the KA…
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…
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…
In order to develop a temperature-sensitive fiber optic cable suitable for fire detection of activated carbon iodine adsorber, this paper proposes a design method for an irradiation-resistant and high-temperature-resistant linear temperature-sensitive fiber optic cable. Through the use of PCVD combi…
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…
While traditional gamma-gamma density (GGD) logging technology is widely utilized, its potential environmental risks have prompted the development of more environmentally friendly neutron-gamma density (NGD) logging technology. However, NGD measurements are influenced by both neutron and gamma radia…
The Shanghai Proton Therapy Device (SAPT) is the first domestic proton therapy demonstration system. The rotating gantry constitutes a critical component of the proton therapy apparatus, achieving an isocentric accuracy of ±0.275 mm that surpasses international mainstream equipment, thereby requirin…
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…
Pre-oxidation is a critical step in the preparation of polyacrylonitrile-based (PAN) carbon fibers, and gamma irradiation represents an effective approach for optimizing the thermal pre-oxidation process. However, the effects and underlying mechanisms of gamma irradiation and thermal treatment seque…
CANDLE reactors are a type of fast reactor that burn depleted uranium or natural uranium without chemical reprocessing. One of the crucial challenges in practice is high material radiation damage for the CANDLE reactor. The Double Solitary Waves Reactor (DSWR), with double separated ignition zones, …
To satisfy the teaching and research demands for reactors in general universities, point reactor neutron kinetics, xenon and samarium poisoning, temperature feedback, and lumped-parameter thermal-hydraulic dynamic models for TRIGA (Training, Research, Isotopes, General Atomic) reactors—primarily uti…
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…
Liquid metal heat pipes are important thermal conductive components for space exploration vehicles, exhibiting excellent heat transfer capabilities and isothermal performance. However, during space exploration missions, sodium heat pipes may operate under conditions below or even far below the desig…
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…
