Article
Geosciences, Multidisciplinary
Zhe Jia, Zhongwen Zhan, Hiroo Kanamori
Summary: This article presents a study on the rupture sequence of the M-w 8.2 South Sandwich Island earthquake, revealing its complex variations in both time and space. Through inversion of seismic data, the geometry, location, depth, and temporal characteristics of the fault were determined, and it was found that the earthquake had an unusually long duration.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Physics, Particles & Fields
Kilar Zhang, Guo-Zhang Huang, Jie-Shiun Tsao, Feng-Li Lin
Summary: This paper proposes three scenarios for compact hybrid stars that could provide explanations for LIGO/Virgo events GW170817 and GW190425. By utilizing different equations of state, the study reveals that these hybrid stars may have thick dark matter shells, allowing them to be more massive than typical neutron stars while being electromagnetically detected with similar sizes.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
R. Silwal, C. Andreoiu, B. Ashrafkhani, J. Bergmann, T. Brunner, J. Cardona, K. Dietrich, E. Dunling, G. Gwinner, Z. Hockenbery, J. D. Holt, C. Izzo, A. Jacobs, A. Javaji, B. Kootte, Y. Lan, D. Lunney, E. M. Lykiardopoulou, T. Miyagi, M. Mougeot, I Mukul, T. Murbock, W. S. Porter, M. Reiter, J. Ringuette, J. Dilling, A. A. Kwiatkowski
Summary: Mass measurements provide valuable information for understanding nuclear structure and astrophysics. High-precision mass measurements of neutron-rich chromium isotopes confirm previous results and refine the understanding of nuclear deformation and collectivity.
Article
Astronomy & Astrophysics
L. Cavallo, G. Cescutti, F. Matteucci
Summary: In this paper, the authors investigate the origin of the large star-to-star variation in the [Eu/Fe] ratios in extremely metal-poor stars. By considering the chemical enrichment of Eu in the building blocks of the Galactic halo, they find that the dynamics of binary systems in the gravitational potential of the host galaxy play a role in the enrichment from neutron star mergers.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Physics, Nuclear
Binbing Wu, Jie Liu
Summary: We investigate the proton emission from halo nuclei induced by intense x-ray lasers using a nonperturbative quantum S-matrix approach. Our results show that the angular distributions of proton emission are sensitive to the laser frequency, exhibiting an interesting petal structure. The Coulomb repulsion potential between the proton and the remainder nucleus hinders the total multiphoton rates of proton emissions and causes blueshifts in the multiphoton transition frequency. Additionally, the polarization effects of laser fields on total rates of proton emission have been addressed, with a transition from perturbative to nonperturbative proton emission depending on the laser frequency.
Article
Physics, Nuclear
Jing Geng, Yi Fei Niu, Wen Hui Long
Summary: Using the axially deformed relativistic Hartree-Fock-Bogoliubov (D-RHFB) model, the mechanism behind the parity inversion and halo occurrence in Be-11 is explored, which are well reproduced by the RHF Lagrangian PKA1. It is demonstrated that the enhanced deformation effects by the pi-pseudo-vector and rho-tensor couplings in PKA1 are crucial for accurately describing both the even-parity ground state (GS) and the neutron halo of Be-11. Coupling with the deformation, the intrude 11Be. Moreover, the deformed halo in Be-11 is found to be stabilized by the attractive inherent correlations between the nucleons.
Article
Astronomy & Astrophysics
P. Capel, D. R. Phillips, H-W Hammer
Summary: In this study, the breakup of Be-11 was calculated using Halo Effective Field Theory and the Dynamical Eikonal Approximation, with the inclusion of an effective Be-10-n-target force. The results show an improved description of neutron-energy and angular spectra on a C-12 target, especially near the Be-11 5/2(+) state. By adjusting the range parameters of the three-body force, a reasonable description of data in the region of the 3/2(+) Be-11 state was also achieved, demonstrating the sensitivity of the overlap integral structure governing Be-11 s-to-d-state transitions induced by the three-body force.
Article
Physics, Nuclear
K. Kuhn, F. Sarazin, F. M. Nunes, M. A. G. Alvarez, C. Andreoiu, D. W. Bardayan, P. C. Bender, J. C. Blackmon, M. J. G. Borge, R. Braid, B. A. Brown, W. N. Catford, C. Aa Diget, A. DiPietro, T. E. Drake, P. Figuera, A. B. Garnsworthy, J. Gomez-Camacho, G. Hackman, U. Hager, S. Ilyushkin, E. Nacher, P. D. O'Malley, A. Perea, V Pesudo, S. T. Pittman, D. Smalley, C. E. Svensson, O. Tengblad, P. Thompson, C. Unsworth, Z. M. Wang
Summary: The study investigates the nature of 1(-) and 2(-) excited states in Be-10 through the Be-11(p, d) transfer reaction, and finds that their structure is a complex mixture of cluster and halo structures, rather than being uniquely halo-like or cluster-like. The experiment specifically probed a halo-like Be-11 (1/2(+)) configuration in both states, limiting further insights into the structures of these excited states.
Article
Geosciences, Multidisciplinary
F. Romano, A. R. Gusman, W. Power, A. Piatanesi, M. Volpe, A. Scala, S. Lorito
Summary: The source of the tsunami generated by the 2021 M-W 8.1 Raoul Island earthquake was estimated through the inversion of tsunami signals recorded by DART sensors. This event was the first major tsunamigenic event captured by the New Zealand DART network in the South West Pacific, providing valuable information for estimating the tsunami source.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Physics, Nuclear
Xiang-Xiang Sun, Lu Guo
Summary: We conducted a microscopic study on the fusion reactions 14,15C + 232Th, focusing on the influence of deformed halo structure on reaction dynamics using the time-dependent density functional theory. By obtaining internuclear potentials through the density-constraint frozen Hartree-Fock approach, we calculated the fusion cross sections of 14,15C + 232Th considering all orientations of deformed reactants. Our calculations successfully reproduced the enhancement of fusion cross sections at sub-barrier energies and provided insights into the underlying mechanism driven by the deformed halo structure of 15C. Additionally, we found that the one-neutron transfer probabilities were more sensitive to the orientations of 15C than 232Th, indicating the notable effects of halo structure on the reaction dynamics.
Article
Engineering, Aerospace
Juan Jose Blanco, Juan Ignacio Garcia-Tejedor, Oscar Garcia-Poblacion, Sindulfo Ayuso, Alejandro Lopez-Comazzi, Ivan Vrublevskyy, Manuel Prieto, Anna Morozova
Summary: ORCA is a cosmic ray detector located at the Juan Carlos I Spanish Antarctic Base. It consists of three detectors and is capable of measuring neutron count rates and incident directions. This paper presents the installation, operational status, and measurement results of ORCA.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Chemistry, Physical
Cole A. Corlett, Matthias D. Frontzek, Nina Obradovic, Jeremy L. Watts, William G. Fahrenholtz
Summary: This study characterized the effects of mechanical activation on crystallographic site occupancy in magnesium aluminate spinel using neutron diffraction.
Article
Astronomy & Astrophysics
J. G. Lia, N. Michela, H. H. Lia, W. Zuo
Summary: In this study, the Gamow shell model was applied to calculate nuclear observables of Ne isotopes (26-31) near the neutron drip-line, revealing a one-neutron halo structure and providing a proper analysis. The results support experimental evidence and suggest that Ne-29 is a good candidate for a one-neutron p-wave halo in the medium-mass region.
Article
Astronomy & Astrophysics
A. Revel, J. Wu, H. Iwasaki, J. Ash, D. Bazin, B. A. Brown, J. Chen, R. Elder, P. Farris, A. Gade, M. Grinder, N. Kobayashi, J. Li, B. Longfellow, T. Mijatovic, J. Pereira, A. Poves, A. Sanchez, N. Shimizu, M. Spieker, Y. Utsuno, D. Weisshaar
Summary: The heavy-ion inelastic scattering of neutron-rich nucleus 29Ne to its excited states was studied using a 100.1 MeV/u 29Ne rare isotope beam. The simultaneous measurements of the two inelastic reactions were conducted, providing the first measurement of transition strengths for this isotope. A significant E2 strength in the excitation to the 931-keV state was observed, indicating a large degree of collectivity.
Article
Nuclear Science & Technology
En-Bo Huo, Ke-Ran Li, Xiao-Ying Qu, Ying Zhang, Ting-Ting Sun
Summary: The possible exotic nuclear properties in neutron-rich Ca, Ni, Zr, and Sn isotopes were studied using the continuum Skyrme Hartree-Fock-Bogoliubov theory and the Green's function method. The effects of pairing correlation, couplings with continuum, and blocking effects were properly considered. The study found that the neutron-rich isotopes show different properties depending on the criteria used for neutron drip line prediction, and the presence of unpaired odd neutron leads to lower neutron pairing energies in odd-A nuclei compared to neighbor-ing even-even nuclei. Possible halo structures were predicted in neutron-rich Ca, Ni, and Sn isotopes, characterized by significant deviations from the traditional r ? A(1/3) rule and diffuse spatial density distributions. The contributions of various partial waves to the neutron density were analyzed, and it was found that orbitals near the Fermi surface, particularly those with small angular momenta, significantly affect the extended nuclear density and large rms radii. The evolution of the number of neutrons above the Fermi surface as a function of mass number A is consistent with the pairing energy, supporting the important role of pairing correlation in halo phenomena.
NUCLEAR SCIENCE AND TECHNIQUES
(2023)
Editorial Material
Nuclear Science & Technology
Yu-Gang Ma
NUCLEAR SCIENCE AND TECHNIQUES
(2023)
Article
Mathematics, Applied
Zhuoran Chen, Chao Yang, Jiang-Hai Qian, Dingding Han, Yu-Gang Ma
Summary: This paper introduces a recursive traffic percolation framework to model cascading failures and analyze potential bottlenecks. Unlike previous work, it considers the influence of external flow, providing a novel perspective on regional commuting. An empirical study is conducted to validate the accuracy and effectiveness of the proposed framework, revealing that external flows from different regions impact the network. Our work only requires primary data and verifies the enhancement of the functional network.
Article
Mathematics, Interdisciplinary Applications
Jiang-Hai Qian, Qi-Jia Liao, Jing Xu, Han-Yun Chang, Ding-Ding Han, Yu-Gang Ma
Summary: We study a network model in which the spatial constraint changes with the network growth and find that the dynamic constraint generally leads to a non-stationary multiple scaling law in degree distribution. Specifically, we demonstrate the successive emergence of different power-law segments during the network evolution, from a single power law at the beginning to a double one and to more scaling laws due to the model setting. Our findings suggest a plausible geometric origin of the double power-law distribution and predict its non-stationary nature accompanied by its emergence, which are supported by our empirical study on the Chinese airline network.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Nuclear Science & Technology
Kai-Jie Chen, Long-Xiang Liu, Zi-Rui Hao, Yu-Gang Ma, Hong-Wei Wang, Gong-Tao Fan, Xi-Guang Cao, Hang-Hua Xu, Yi-Fei Niu, Xin-Xiang Li, Xin-Rong Hu, Yu-Xuan Yang, Sheng Jin, Pan Kuang
Summary: The Shanghai laser electron gamma source (SLEGS) is used to study photonuclear physics, particularly giant dipole resonance (GDR) and pygmy dipole resonance. The SLEGS neutron time-of-flight (TOF) spectrometer aims to measure GDR and specific nuclear structures above the neutron threshold. Geant4 simulation was used to determine detector efficiency and layout for the TOF spectrometer. Offline experiments evaluated the performance, with a time resolution of approximately 0.9 ns.
NUCLEAR SCIENCE AND TECHNIQUES
(2023)
Review
Nuclear Science & Technology
Wan-Bing He, Yu-Gang Ma, Long-Gang Pang, Hui-Chao Song, Kai Zhou
Summary: Although seemingly unrelated, high-energy nuclear physics (HENP) and machine learning (ML) have recently started to merge, leading to interesting outcomes. The application of ML in HENP can offer a novel approach and broaden the understanding of this interdisciplinary field. This mini-review aims to inform the community about the current status and provide an overview of ML's application in HENP.
NUCLEAR SCIENCE AND TECHNIQUES
(2023)
Article
Physics, Multidisciplinary
T. Pohl, Y. L. Sun, A. Obertelli, J. Lee, M. Gomez-Ramos, K. Ogata, K. Yoshida, B. S. Cai, C. X. Yuan, B. A. Brown, H. Baba, D. Beaumel, A. Corsi, J. Gibelin, A. Gillibert, K. I. Hahn, T. Isobe, Y. Kondo, T. Kobayashi, Y. Kubota, P. Li, P. Liang, H. N. Liu, J. Liu, T. Lokotko, F. M. Marques, Y. Matsuda, T. Motobayashi, T. Nakamura, N. A. Orr, H. Otsu, V. Panin, S. Y. Park, S. Sakaguchi, M. Sasano, H. Sato, H. Sakurai, Y. Shimizu, A. I. Stefanescu, L. Stuhl, D. Suzuki, T. Uesaka, H. Wang, X. Xu, Z. H. Yang, K. Yoneda, J. Zenihiro
Summary: We report on the first proton-induced single proton- and neutron-removal reactions from the neutron-deficient 14O nucleus with large Fermi-surface asymmetry Sn - Sp 1/4 18.6 MeV at similar to 100 MeV/nucleon, a widely used energy regime for rare-isotope studies. The measured inclusive cross sections and parallel momentum distributions of the 13N and 13O residues are compared to the state-of-the-art reaction models, with nuclear structure inputs from many-body shell-model calculations. Our results provide the first quantitative contributions of multiple reaction mechanisms including the quasifree knockout, inelastic scattering, and nucleon transfer processes. It is shown that the inelastic scattering and nucleon transfer are important tools for investigating single-particle strengths and correlations in atomic nuclei.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Rurie Mizuno, Megumi Niikura, Tokihiro Ikeda, Teiichiro Matsuzaki, Shintaro Go, Takeshi Y. Saito, Shin'ichiro Michimasa, Hiroyoshi Sakurai
Summary: The performance of germanium detectors for high-energy gamma-rays was evaluated. A 992-keV resonance in the Al-27(p, gamma)Si-28 reaction was used for the measurement at the RIKEN tandem accelerator. The energy of the excited state from the resonance was determined as 12540.7(2) keV. An energy calibration function and photo peak efficiency for Ge detectors up to 10.8-MeV photons were deduced using the newly determined excitation energy. The overall energy region achieved an energy accuracy of 0.3 keV. This reaction provides reliable energy and efficiency standards for high-energy gamma-rays.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2023)
Editorial Material
Nuclear Science & Technology
Yu-Gang Ma
Summary: Directed flow (v(1)) of hypernuclei H-3 (Lambda) and H-4 (Lambda) is observed in mid-central Au+Au collisions at root s (NN) = 3 GeV at RHIC, providing a new possibility for studying hyperon-nucleon (Y-N) interaction under finite pressure. Additionally, multi-strangeness hypernuclei offer a venue to investigate hyperon-nucleon-nucleon (Y-N-N) and even hyperon-hyperon-nucleon (Y-Y-N) interactions. Hypernuclei play a crucial role in connecting nuclear collisions with the equation of state governing the inner structure of compact stars.
NUCLEAR SCIENCE AND TECHNIQUES
(2023)
Article
Physics, Multidisciplinary
S. M. Wang, W. Nazarewicz, A. Volya, Y. G. Ma
Summary: The most important law of radioactivity is the exponential decay law, which is, however, neither rigorous nor fundamental in the realm of quantum mechanics. While deviations from exponential decay have been observed experimentally at the early stage of decay, there is little evidence for nonexponential behavior at long times. Nonetheless, theoretically, long-term nonexponentiality is expected to reveal the nonresonant background components of the initial wave function and provide information about interference and memory. This paper proposes new observables for experimental investigations of the post-exponential decay regime, with examples in atomic nuclei, but applicable to other many-body open quantum systems.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Nuclear
Ling -Meng Fang, Yu -Gang Ma, Song Zhang
Summary: In this study, the collective flows of protons and deuterons in Au + Au collisions were simulated using an isospin-dependent quantum molecular dynamics model. The effects of naive coalescence and dynamical coalescence models on deuteron formation were compared. After achieving a reasonable agreement between the proton and deuteron rapidity spectra and the high acceptance dielectron spectrometer data, an event-plane method was used to calculate the first four order collective flow coefficients and the ratios of (v4)/(v2)2 and (v3)/((v1)(v2)), as well as studying the scaling of the number of constituent nucleons between protons and deuterons. Additionally, the dependence of en versus (vn) and the ratio (vn)/en on centrality was obtained. Finally, the Pearson coefficients corr(vn, vm) between the first four harmonic flows for protons and deuterons were investigated as a function of rapidity and centrality.
Article
Physics, Nuclear
Yu-Xuan Zhang, Song Zhang, Yu-Gang Ma
Summary: The study examines light nuclei to understand both the production mechanism and the interactions between nucleons and other particles in the medium. The ALICE Collaboration recently presented data on the transverse momentum spectra of deuterons in p-p collisions at vs = 13 TeV and p-Pb collisions at vs(NN) = 5.02 TeV. Using a multiphase transport model with a string melting mechanism and a coalescence afterburner, the study successfully reproduces the transverse momentum spectra of deuterons and obtains the conditional yields of deuterons and protons. According to the coalescence model, it is predicted that there is a scaling relationship between the conditional yield ratios of deuterons to protons and the inclusive yield ratios, similar to the constituent nucleon number scaling for elliptic flow. The study also foresees the possibility of near-side suppression in the correlation function, similar to two-baryon azimuthal correlations.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Nuclear
Ting -Ting Wang, Yu-Gang Ma, Song Zhang
Summary: In this study, momentum correlation functions of light (anti)nuclei in several central heavy-ion collision systems are calculated using the AMPT model and the Lednick and Lyuboshitz method. It is found that the emission source of light (anti)nuclei has a smaller space extent in more peripheral collisions. The correlation between the emission source size and the system size is also explored, and it is found to be self-consistent. Furthermore, the average emission sequence of nonidentical light nuclei pairs is inferred using momentum correlation functions gated on velocity, and it is observed that protons are emitted on average on a timescale similar to neutrons but earlier than deuterons or tritons, with a larger interval of the average emission order observed for smaller collision systems or more peripheral collisions.
Article
Physics, Nuclear
Rui Wang, Yu-Gang Ma, Lie-Wen Chen, Che Ming Ko, Kai-Jia Sun, Zhen Zhang
Summary: We develop a kinetic approach to study the production of light nuclei in intermediate-energy heavy-ion collisions. The conversions between nucleons and light nuclei and the Mott effect on light nuclei are included dynamically in our approach. Our study provides a reasonable description of the measured yields of light nuclei in central Au + Au collisions and indicates that the observed enhancement of alpha-particle yield at low incident energies can be attributed to a weaker Mott effect.
Article
Physics, Nuclear
Y. T. Cao, X. G. Deng, Y. G. Ma
Summary: Different alpha-cluster configurations in Ca-40 + O-16 collisions lead to different yields of light nuclei, and the magnitude hierarchy of geometric fluctuations is determined by the structure of O-16.
Article
Physics, Nuclear
Ling-Meng Fang, Yu-Gang Ma, Song Zhang
Summary: The study utilized an Isospin dependent Quantum Molecular Dynamics (IQMD) model to simulate Au + Au collisions at a specific beam energy, obtaining results consistent with experimental data for pi(-) and pi(+) rapidity and transverse mass spectra, as well as the Hanbury Brown and Twiss (HBT) radius. Additionally, the research explored the eccentricities of pion-pair emissions as a function of pair transverse momentum and collision centrality, revealing asymmetric transverse emission trends.
EUROPEAN PHYSICAL JOURNAL A
(2022)
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.
