Article
Astronomy & Astrophysics
Hong-Ming Liu, Jin-Biao Wei, Zeng-Hua Li, G. F. Burgio, H. -j. Schulze
Summary: This paper investigates the effects of dark matter on neutron stars by utilizing a DM-admixed model. The Brueckner-Hartree-Fock theory, combined with realistic three-body forces and a generic bosonic self-interacting dark matter model, is used to describe the equations of state for nuclear matter and dark matter, respectively. The study focuses on the complete set of stable 'dark' neutron stars and particularly the observable radii of these objects. A diverse range of stellar configurations is discovered and extensively discussed.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Physics, Multidisciplinary
Xiaoying Qu, Hui Tong, Chencan Wang, Sibo Wang
Summary: A novel description of strongly interacting pure neutron matter (PNM) is presented using the relativistic Brueckner-Hartree-Fock (RBHF) theory. The scalar and vector components of the single-particle potentials are compared with RBHF calculations without negative-energy states. The results show that the binding energies of PNM are softer than those predicted by the Brueckner-Hartree-Fock theory with three-body forces, and are consistent with Monte Carlo simulations and many-body perturbation theory within uncertainties. The equation of state for neutron star matter is also in agreement with astrophysical observations and heavy-ion collision experiments. Additionally, the tidal deformabilities of binary neutron star systems are calculated and found to be consistent with observational constraints from GW170817.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Physics, Nuclear
Sibo Wang, Hui Tong, Chencan Wang
Summary: In this study, the relativistic Brueckner-Hartree-Fock equations are self-consistently solved for symmetric nuclear matter in the full Dirac space using the continuous choice for the single-particle potential. Inspired by nucleon-nucleon scattering in free space, the energy denominator of the scattering equation in the nuclear medium is rewritten to derive a complex Thompson equation for the effective interaction G matrix. By decomposing the matrix elements of the single-particle potential operator in the full Dirac space, both the real and imaginary parts of the single-particle potential are uniquely determined. The convergence of the hole-line expansion is discussed by comparing the equation of state obtained within the continuous choice with those obtained within the gap choice and in-between choice.
Article
Physics, Nuclear
Jing Zhang, Hong-Ming Liu, Zeng-Hua Li, G. F. Burgio, H-J Schulze
Summary: The critical parameters of the liquid-gas phase transition of symmetric nuclear matter are computed using the Brueckner-Hartree-Fock method at finite temperature with different realistic nucleon-nucleon potentials. The temperature effects on single-particle potentials, defect functions, and three-body forces are discussed in detail. Results obtained from the full procedure and frozen-correlations approximation are compared. Critical temperatures ranging from approximately 14 to 19 MeV and critical densities in the range of 0.05 to 0.08 fm(-3) are found, depending on the interactions employed.
Article
Physics, Multidisciplinary
Kh Gad
Summary: In this study, the equation of state for asymmetric nuclear matter is investigated using the Brueckner-Hartree-Fock approach with high-quality soft nucleon-nucleon potentials. The results show that the models are able to reproduce the empirical symmetry energy and its slope parameter at the empirical saturation density, and are in good agreement with experimental data from heavy nucleus collisions.
INDIAN JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
W. Haider, Syed Rafi, J. R. Rook, A. Bhagwat
Summary: The Brueckner-Hartree-Fock approach provides a non-local nucleon-nucleus optical potential, which requires solving an integro-differential equation. In this study, we propose an alternative approach that expresses the exchange part of the potential as an infinite series. By using a local approximation, we demonstrate that the first term of the series accurately represents the exchange potential. Results show that the second and third terms of the series have minimal contributions, justifying the use of a local approximation.
PRAMANA-JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Lei Wang, Qinglin Niu, Jinjuan Zhang, Jian Liu, Zhongzhou Ren
Summary: In this study, the scaling analyses were applied to study the inclusive electron scattering and a modified scaling function was proposed to investigate the high-momentum part of the momentum distributions. The effects of nucleon-nucleon short-range correlation on the cross sections were systematically explored using the proposed scaling function and the strength of the correlation was extracted from experimental data. This research offers a new method to investigate nucleon momentum distributions and nucleon-nucleon short-range correlation effects in nuclei.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Physics, Nuclear
P. Proust, Y. Lallouet, D. Davesne, J. Meyer
Summary: We generalize the semiclassical approach of Grammaticos and Voros to N2LO Skyrme functionals to calculate the extended Thomas-Fermi expressions of the new densities and currents at N2LO level. Using a simple Fermi-like density profile in a one-dimensional model, we obtain an easy-to-use formula for the surface-energy coefficient, incorporating contributions from central, density-dependent, and spin-orbit terms up to h bar 2. This formula serves as a first attempt to constrain the surface properties of new N2LO Skyrme parametrizations. The tested N2LO parametrization in this paper exhibits a quantitatively similar shift compared to traditional Skyrme parametrizations.
Article
Chemistry, Physical
Hugh G. A. Burton
Summary: Electron correlation effects are crucial in stabilizing two-electron atoms near the critical nuclear charge, and understanding them relies on a solid grasp of the uncorrelated Hartree-Fock description. By exploring different symmetry-restricted Hartree-Fock formalisms, we identified the nuclear charge where spin-symmetry breaking occurs, leading to an unrestricted wave function predicting inner and outer electrons. We also found closed-shell and unrestricted critical nuclear charges where the highest occupied orbital energy reaches zero and the electron density separates from the nucleus, highlighting the importance of fractional spin errors and static correlation for small nuclear charges.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Tanner Culpitt, Laurens D. M. Peters, Erik I. Tellgren, Trygve Helgaker
Summary: The study investigates the properties of the diagonal nonadiabatic term in the Born-Oppenheimer wave function ansatz, deriving analytic expressions for the Berry curvature and DBOC and calculating their properties in several molecules based on magnetic field strength and bond distance. The results indicate that the characteristics of DBOC and Berry curvature vary between molecules and instances of broken time-reversal symmetry are identified in the dissociation curves of BH and CH+.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Nuclear
Jun-Hao Cheng, Zhen Zhang, Xi-Jun Wu, Peng-Cheng Chu, Xiao-Hua Li
Summary: In this study, the proton radioactivity half-lives of 33 spherical nuclei were systematically investigated based on the correlation between Skyrme parameters and macroscopic quantities of nuclear matter. A new Skyrme parameter set was obtained by fitting the two most weighted macroscopic quantities, and the theoretical proton radioactivity half-lives calculated using this new parameter set showed better agreement with experimental data compared to previous models.
Article
Astronomy & Astrophysics
Poonam Choudhary, Bheemsehan Gurjar, Dipankar Chakrabarti, Asmita Mukherjee
Summary: Gravitational form factors provide information about internal distributions of mass, energy, pressure, and shear. The Druck term is the least understood among all form factors. In this study, the Druck form factor is investigated in a light front quark-diquark model, and the 3D distribution in the Breit frame is evaluated using Abel transformation.
Article
Physics, Nuclear
Stephanie M. Lauber, Hayden C. Frye, Calvin W. Johnson
Summary: The study compares angular-momentum projected-after-variation Hartree-Fock calculations to full configuration-interaction results in a shell model basis, finding reasonably good agreement in the excitation spectra. Shape coexistence and mixing in shape coexistence improves the spectrum, particularly in the sd- and pf-shells. While the complex spectra of germanium isotopes present challenges, the projected Hartree-Fock method generally provides a better description of low-lying nuclear spectra than expected, with the use of gradient descent and unrestricted shapes being key to its success.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2021)
Article
Physics, Multidisciplinary
K. H. Gad
Summary: In this study, a new microscopic equation of state (EoS) for pure neutron matter (PNM) at zero temperature was derived using realistic two-body interactions obtained from chiral perturbation theory. The EoS was found to be sensitive to the momentum-space cut-off Lambda, and the inclusion of two-body density-dependent Skyrme potential resulted in a stiffer EoS. Comparisons with other microscopic approaches were made, showing the importance of central and tensor components in the NN potential for determining the binding energy.
PRAMANA-JOURNAL OF PHYSICS
(2021)
Article
Multidisciplinary Sciences
Adam L. Baskerville, Msugh Targema, Hazel Cox
Summary: This study investigates the Colle-Salvetti (CS) formula, the basis of the Lee, Yang and Parr (LYP) correlation functional used in approximate density functional theory. The accuracy of the CS formula in calculating anions is determined by reparametrizing it using high-accuracy Hartree-Fock (HF) wavefunctions. The analysis of the CS parameters used in the popular LYP functional reveals the ingenuity and perhaps fortuitousness of the original formulation by CS.
ROYAL SOCIETY OPEN SCIENCE
(2022)
Article
Engineering, Aerospace
Qingzong Xu, Qiang Du, Pei Wang, Xiangtao Xiao, Jun Liu
Summary: The aerothermal performance of interrupted slot and film holes was investigated numerically, showing that the interrupted slot performs better and the step formed along with it affects film cooling characteristics. Density ratio has a smaller effect on total pressure loss, and positioning film holes away from the upstream step delivers optimal cooling efficiency.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
(2022)
Article
Environmental Sciences
Cong Wang, Yonglong Lu, Bin Sun, Meng Zhang, Ruoyu Mao, Xiaoqian Li, Shuai Song, Jixin Zhao, Mingzhao Yu, Yajuan Shi, Pei Wang
Summary: This study investigated the manipulation of freshwater food web through species introduction to control algae growth in Wuliangsuhai Lake and its impact on food web relationships and contaminant transfer. The results showed that fish in the manipulated area had lower trophic levels and lower concentrations of target pollutants. However, the trophic magnification factors of certain pollutants in fish increased.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Yashi Zhou, Jing Li, Huachun Zhang, Zhen Chen, Lei Zhang, Pei Wang
Summary: Digital beamforming synthetic aperture radar is a promising technology to improve the performance of radar systems for high-resolution and wide-swath imaging. This letter describes the configuration of a 16-channel DBF-SAR system and proposes an internal calibration technique to enhance SAR image quality.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Engineering, Environmental
Yonglong Lu, Pei Wang, Chenchen Wang, Meng Zhang, Xianghui Cao, Chunci Chen, Cong Wang, Cuo Xiu, Di Du, Haotian Cui, Xiaoqian Li, Wenyou Qin, Yi Zhang, Yichao Wang, Anqi Zhang, Mingzhao Yu, Ruoyu Mao, Shuai Song, Andrew C. Johnson, Xiuqing Shao, Xuan Zhou, Ting Wang, Ruoyu Liang, Chao Su, Xiaoqi Zheng, Sheng Zhang, Xiaotian Lu, Yuqing Chen, Yueqing Zhang, Qifeng Li, Kotaro Ono, Nils C. Stenseth, Martin Visbeck, Venugopalan Ittekkot
Summary: The study found that the Yangtze River delivers the highest loads of pollutants to the seas, and the spatial distribution of pollutants is influenced by the increasing latitudinal gradient, showing a cold-trapping effect in soil concentrations. Metal pollution poses high ecological risks to coastal ecosystems, and the ecological risks for protected species vary depending on different priority pollutants.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Xiaoqian Li, Yonglong Lu, Yajuan Shi, Pei Wang, Xianghui Cao, Haotian Cui, Meng Zhang, Di Du
Summary: Estuarine rivers play a crucial role in transporting pollutants from human activities, such as poly cyclic aromatic hydrocarbons (PAHs), to the ocean. This study investigated the distribution of PAHs in estuarine river water in three coastal economic circles of China. The results showed moderate levels of PAHs pollution and ecological risk. Coal and petroleum combustion were identified as the primary sources of PAHs, with regional variations in source composition. Air pollution caused by energy emissions, particularly carbon emissions, had a significant and differential impact on PAHs distribution and deposition. The increasing use of clean energy has led to a gradual reduction in PAHs emissions, providing an effective option for reducing PAHs in rapidly urbanizing coastal regions.
ENVIRONMENTAL POLLUTION
(2022)
Article
Materials Science, Multidisciplinary
Jianyang Li, Chonghong Zhang, Yitao Yang, Tieshan Wang, Ignacio Martin-Bragado
Summary: In this study, defect features in the Fe-C system under irradiation were investigated using an Object Kinetic Monte Carlo (OKMC) model. The results showed that higher dose rate irradiation led to higher interstitial-loop density and irradiation hardening, while the dose rate had no significant influence on defect features at high dose range. Additionally, higher carbon concentration also resulted in higher interstitial loop density and irradiation hardening.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Astronomy & Astrophysics
Jian-Wei Mao, Jian-Ping Yuan, Zhi-Gang Wen, Jian Li, Na Wang, Pei Wang, Rai Yuen, Yu-Bin Wang, Nan-Nan Zhai, Zhi-Yong Liu, Mao-Zheng Chen, Guang-Hui Li
Summary: This study conducted a targeted search for bursts from FRB 20201124A and tested the performance of the search pipeline using injected mock FRBs. The results showed high recovery rates and acceptable performance, but no bursts were detected from FRB 20201124A in the middle of 2021.
RESEARCH IN ASTRONOMY AND ASTROPHYSICS
(2022)
Article
Multidisciplinary Sciences
Yi Feng, Di Li, Yuan-Pei Yang, Yongkun Zhang, Weiwei Zhu, Bing Zhang, Wenbin Lu, Pei Wang, Shi Dai, Ryan S. Lynch, Jumei Yao, Jinchen Jiang, Jiarui Niu, Dejiang Zhou, Heng Xu, Chenchen Miao, Chenhui Niu, Lingqi Meng, Lei Qian, Chao-Wei Tsai, Bojun Wang, Mengyao Xue, Youling Yue, Mao Yuan, Songbo Zhang, Lei Zhang
Summary: Observations of five repeating FRBs revealed a trend of lower polarization at lower frequencies. This behavior can be modeled as multipath scattering, characterized by the rotation measure (RM) scatter. Sources with higher RM scatter have higher RM magnitude and scattering time scales. Furthermore, the two sources with the highest RM scatter are associated with compact persistent radio sources.
Article
Astronomy & Astrophysics
C. C. Miao, W. W. Zhu, D. Li, P. C. C. Freire, J. R. Niu, P. Wang, J. P. Yuan, M. Y. Xue, A. D. Cameron, D. J. Champion, M. Cruces, Y. T. Chen, M. M. Chi, X. F. Cheng, S. J. Dang, M. F. Ding, Y. Feng, Z. Y. Gan, G. Hobbs, M. Kramer, Z. J. Liu, Y. X. Li, Z. K. Luo, X. L. Miao, L. Q. Meng, C. H. Niu, Z. C. Pan, L. Qian, Z. Y. Sun, N. Wang, S. Q. Wang, J. B. Wang, Q. D. Wu, Y. B. Wang, C. J. Wang, H. F. Wang, S. Wang, X. Y. Xie, M. Xie, Y. F. Xiao, M. Yuan, Y. L. Yue, J. M. Yao, W. M. Yan, S. P. You, X. H. Yu, D. Zhao, R. S. Zhao, L. Zhang
Summary: We present the observational results of 12 MSPs discovered with FAST in the CRAFTS survey, including timing ephemeris, polarization pulse profiles, Faraday rotation measurements, and RVM fitting. These timing campaigns were conducted over 3 years with FAST and Arecibo. Majority of the MSPs are in neutron star-white dwarf binaries, with orbital periods consistent with theoretical expectations for MSP-He WD systems. One pulsar shows anomalous characteristics, with smaller spin frequency and companion mass, potentially due to low orbital inclination.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Metallurgy & Metallurgical Engineering
Fei Guo, Cheng-Wu Zheng, Pei Wang, Dian-Zhong Li, Yi-Yi Li
Summary: It is found in this study that under low-oxygen conditions, the addition of trace rare earth elements can significantly influence the nucleation, morphology, and growth of ferrite in Fe-0.14%C alloy, by slowing down carbon diffusion and decreasing grain boundary energy. This research provides evidence for adjusting phase transformation and improving the mechanical properties of steels through the addition of rare earth elements.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Nuclear Science & Technology
Jianyang Li, Chonghong Zhang, Ignacio Martin-Bragado, Yitao Yang, Tieshan Wang
Summary: This work investigates the defect features in a dilute FeMnNi alloy using an Object Kinetic Monte Carlo (OKMC) model based on the grey-alloy method. The study reveals that the density of defect clusters increases while the average size of defect clusters decreases with increasing dose rate. However, the dose-rate effect decreases with increasing irradiation dose. The model considers mechanisms for producing <100>-type self-interstitial atom (SIA) loops and provides reasonable production ratios.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2023)
Article
Astronomy & Astrophysics
Rushuang Zhao, Di Li, George Hobbs, Pei Wang, Mengyao Xue, Shijun Dang, Hui Liu, Qijun Zhi, Chenchen Miao, Mao Yuan, Jiarui Niu, Lingqi Meng, Weiwei Zhu
Summary: We observed evidence of subpulse drifting and micropulses in eight pulsars using the ultra-wide-bandwidth receiver on FAST. Three pulsars showed single pulses for the first time, and four pulsars exhibited subpulse drifting. PSR J0034-0721 displayed bimodal behavior in nulling, with short-duration null events being frequency-dependent and long-duration null events being frequency-independent. We also detected microstructures in the pulses of PSR J0034-0721 and PSR J0151-0635.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Yuhao Zhu, Chenhui Niu, Xianghan Cui, Di Li, Yi Feng, Chaowei Tsai, Pei Wang, Yongkun Zhang, Fanyi Meng, Zheng Zheng
Summary: This study aims to determine whether multi-structural one-off FRBs and repeaters share similarities by analyzing the relationship between the FRB event rate and the star formation rate, and using statistical testing methods. Energy functions for four subsamples were calculated based on the CHIME/FRB Catalog 1, and it was found that all subsamples show a similar cosmological evolution trend. However, the multi-structural one-offs and repeaters were found to be distinguishable from the KS and MWW tests.
Article
Instruments & Instrumentation
Q. M. Xu, J. Gou, C. H. Zhang, Z. H. Yang, Y. Y. Wang, X. X. Han, J. Y. Li, Y. Song
Summary: Ion irradiation of aluminum magnesium spinel (MgOAl2O3) can result in luminescence emission. This study irradiated single crystals of MgOAl2O3 with swift heavy ions and obtained emission spectra in the range of 200-800 nm. The emission bands originated from radiative recombination of excitons and impurity ions. The results showed that the spectral intensity increased with higher ion energy but decreased with increasing irradiation dose due to crystal damage. Luminescence emission occurred when the critical electronic energy loss reached approximately 7.2 keV/nm.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Multidisciplinary Sciences
Weiwei Zhu, Heng Xu, Dejiang Zhou, Lin Lin, Bojun Wang, Pei Wang, Chunfeng Zhang, Jiarui Niu, Yutong Chen, Chengkui Li, Lingqi Meng, Kejia Lee, Bing Zhang, Yi Feng, Mingyu Ge, Ersin Goegues, Xing Guan, Jinlin Han, Jinchen Jiang, Peng Jiang, Chryssa Kouveliotou, Di Li, Chenchen Miao, Xueli Miao, Yunpeng Men, Chenghui Niu, Weiyang Wang, Zhengli Wang, Jiangwei Xu, Renxin Xu, Mengyao Xue, Yuanpei Yang, Wenfei Yu, Mao Yuan, Youling Yue, Shuangnan Zhang, Yongkun Zhang
Summary: This article reports the emergence of a radio pulsar phase of the magnetar 5 months after FRB 20200428. Pulses were detected in 16.5 hours over 13 days, with luminosities of about eight decades fainter than FRB 20200428. The pulses were emitted in a narrow phase window anti-aligned with the x-ray pulsation profile, while bursts appear in random phases. This suggests that radio pulses originate from a fixed region within the magnetosphere, but bursts occur in random locations and are possibly associated with explosive events in a dynamically evolving magnetosphere.
