Article
Physics, Multidisciplinary
Jianguo Li, Yuanzhuo Ma, Nicolas Michel, Baishan Hu, Zhonghao Sun, Wei Zuo, Furong Xu
Summary: The Gamow shell model (GSM) is a powerful method for studying exotic properties of drip line nuclei by including internucleon correlations and continuum coupling. Two types of GSM have been developed: one with phenomenological nuclear interactions and the other with realistic nuclear interactions. This review focuses on recent applications of GSM to drip line nuclei.
Article
Physics, Nuclear
Mohamad Chamseddine, Jerome Margueron, Guy Chanfray, Hubert Hansen, Rahul Somasundaram
Summary: We investigate a relativistic Hartree-Fock Lagrangian with a chiral potential and nucleon polarization to better describe dense nuclear matter. We consider the exchange Fock term, nucleon's compositeness and finite size effects, and short-range correlations. The model parameters are adjusted to reproduce low-energy QCD properties and empirical properties at saturation. By employing Bayesian statistics, we analyze the uncertainties and show that the fit to the symmetry energy provides a very good equation of state compatible with nuclear physics knowledge.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Astronomy & Astrophysics
Sina Chen, Jamie B. Stevens, Philip G. Edwards, Ari Laor, Minfeng Gu, Marco Berton, Emilia Jarvela, Preeti Kharb, Ehud Behar, Renzhi Su
Summary: Radio spectral analyses were conducted on a sample of 29 radio-quiet (RQ) and three radio-loud (RL) narrow-line Seyfert 1 galaxies (NLS1s). The results showed steep radio slopes in the RQ NLS1s, which may be related to AGN-driven outflows. Two RL NLS1s exhibited characteristics of compact optically thick sources, likely relativistic jets. Additionally, some NLS1s showed flattened radio spectra at lower frequencies, possibly due to synchrotron self-absorption.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Quentin G. Bailey, Jennifer L. James, Janessa R. Slone, Kellie O'Neal-Ault
Summary: Complementing previous theoretical and experimental work, this study explores new types of short-range modifications to Newtonian gravity arising from spacetime-symmetry breaking. The first non-perturbative corrections are constructed in the Newtonian limit by considering generic symmetry-breaking terms modifying the gravity sector and examining the isotropic coefficient limit. The results reveal new force law corrections beyond the standard Yukawa parameterization, with potential for large forces compared to the Newtonian prediction at short distances. Experimental signals for typical test mass arrangements are also discussed.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Physics, Nuclear
Eun Jin In, Panagiota Papakonstantinou, Youngman Kim, Seung-Woo Hong
Summary: The location of the neutron drip line, a fundamental question in nuclear physics, requires considering factors such as nuclear potential, pairing correlations, deformation effects, and coupling to the continuum. Recent theoretical developments have explored the influence of deformation on the prediction of the neutron drip line location, finding that this factor can critically affect the theoretical description.
INTERNATIONAL JOURNAL OF MODERN PHYSICS E
(2021)
Article
Astronomy & Astrophysics
Q. Ni, W. N. Brandt, B. Luo, G. P. Garmire, P. B. Hall, R. M. Plotkin, O. Shemmer, J. D. I. I. I. I. I. I. Timlin, F. Vito, J. Wu, W. Yi
Summary: Deeper Chandra observations of weak-line quasars (WLQs) in a representative sample with previously limited X-ray constraints reveal diverse X-ray properties, with some showing extreme variability. The study supports the thick disc and outflow (TDO) model in explaining WLQs' X-ray and multiwavelength properties, with an average covering factor and a range of column densities leading to different levels of absorption and Compton reflection (and/or scattering) among WLQs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
E. Tabar, H. Yakut, G. Hosgor, E. Kemah
Summary: The low-lying magnetic and electric dipole modes in odd-proton Lu-175 have been investigated using the RTGI-QPNM for the first time. The model successfully reproduces the observed dipole spectra, but the individual dipole strength of the states is higher than the experimental values, possibly due to the lack of multiphonon configurations in the model.
Article
Thermodynamics
I. Demirdzic, P. Cardiff
Summary: A general approach to deriving symmetry plane boundary conditions for cell-centered finite-volume continuum mechanics is introduced in this paper. This method is applicable to scalar, vector, and tensor solution variables. The contribution of symmetry plane cell faces is decomposed into implicit and explicit parts, enabling the use of segregated solution algorithms. The derived symmetry plane discretizations are shown to be consistent with the discretization on the internal faces through several unstructured mesh test cases.
NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS
(2022)
Article
Astronomy & Astrophysics
Kazushi Sakamoto, Sergio Martin, David J. Wilner, Susanne Aalto, Aaron S. Evans, Nanase Harada
Summary: The study used Atacama Millimeter-Submillimeter Array to observe the line spectra of three deeply buried nuclei in NGC 4418 and Arp 220, identifying 55 species. Gas rotation around each nucleus was observed, tracing nuclear disks of around 100 pc in size. The research revealed counter-rotation in the dual nuclei of Arp 220, as well as in the nuclear disk and galactic disk of NGC 4418, with varying conditions observed radially.
ASTROPHYSICAL JOURNAL
(2021)
Article
Physics, Nuclear
W. M. Seif, A. S. Hashem, Youstina Ramsis
Summary: The mutual correlation between the nuclear equation of state and the bulk properties of neutron stars is crucial. This study used four different EOSs to investigate the temperature dependence of core-crust transition properties in neutron stars, finding that the softer EOS estimates larger proton fractions and wider ranges for cooling processes as temperature increases.
Article
Mathematics, Interdisciplinary Applications
Roberto Palma, Jose L. Perez-Aparicio, Robert L. Taylor
Summary: The main aim of this work is to study the role of the Maxwell stress tensor in active materials. In the framework of generalised continuum mechanics, a modified total stress formulation is developed and implemented into a finite element research code. It is concluded that generalised mechanics allows for incorporating both symmetric and non-symmetric contributions of the Maxwell tensor, enabling the analysis of rotations generated by the electromagnetic field.
COMPUTATIONAL MECHANICS
(2023)
Article
Multidisciplinary Sciences
Chris Chow Li Tee, Mee Chee Chong, Viswanath Sundar, Chuen Leang Chok, Wee Kian Yeo, Olivier Girard
Summary: This study aimed to investigate the effects of manipulating running velocity and hypoxic exposure on gait asymmetry during treadmill running. The results showed that trained runners exhibited low-to-moderate mechanical asymmetries across a range of submaximal running velocities and varying levels of hypoxia severity.
Article
Engineering, Civil
Wenyong Ma, Xiaobin Zhang, John Macdonald, Longqian Jin, Yuxue Li
Summary: This study investigates the aerodynamic characteristics of a circular cylinder in the critical Reynolds number range, revealing that reattachment only occurs along a certain length of the cylinder, inducing a strong three-dimensional flow state and corresponding aerodynamic force distribution. The reattachment also causes an unsteady variation in aerodynamic force, with the lift coefficient mainly dependent on the occurrence of a separation bubble and the motion of the reattachment point.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Astronomy & Astrophysics
Raul A. Amaya-Almazan, Vahram Chavushyan, Victor M. Patino-Alvarez
Summary: The flat-spectrum radio quasar B2 1633+382 has been studied at multiple frequencies, showing correlated variability in the C iv emission line and continuum light curves. The delay between the line and continuum suggests a small broad-line region (BLR), and the distance of the gamma-ray emission region from the jet apex is estimated to be 37 pc.
ASTROPHYSICAL JOURNAL
(2022)
Article
Engineering, Chemical
Mingqi Li, Huisu Chen, Jianjun Lin, Rongling Zhang, Lin Liu
Summary: This study developed a framework to investigate the impact of pore shape polydispersity on the diffusivity of composite materials. A new algorithm was proposed to detect the excluded area of polydisperse-shaped pores, and numerical calculations were carried out using the finite difference method. The reliability of the theoretical framework was validated by comparing with numerical results.
Article
Astronomy & Astrophysics
Tomas R. Rodriguez, J. Luis Egido
Article
Physics, Multidisciplinary
A. Samark-Roth, D. M. Cox, D. Rudolph, L. G. Sarmiento, B. G. Carlsson, J. L. Egido, P. Golubev, J. Heery, A. Yakushev, S. Aberg, H. M. Albers, M. Albertsson, M. Block, H. Brand, T. Calverley, R. Cantemir, R. M. Clark, Ch E. Duellmann, J. Eberth, C. Fahlander, U. Forsberg, J. M. Gates, F. Giacoppo, M. Goetz, S. Goetz, R-D Herzberg, Y. Hrabar, E. Jaeger, D. Judson, J. Khuyagbaatar, B. Kindler, I Kojouharov, J. Kratz, J. Krier, N. Kurz, L. Lens, J. Ljungberg, B. Lommel, J. Louko, C-C Meyer, A. Mistry, C. Mokry, P. Papadakis, E. Parr, J. L. Pore, I Ragnarsson, J. Runke, M. Schaedel, H. Schaffner, B. Schausten, D. A. Shaughnessy, P. Thoerle-Pospiech, N. Trautmann, J. Uusitalo
Summary: The experiment successfully studied the α-decay chains of isotopes of flerovium, observing an excited state in the heavy element 282Cn and the Q(alpha) value of 288Fl, with implications on the anticipated shell gap at Z=114.
PHYSICAL REVIEW LETTERS
(2021)
Editorial Material
Physics, Multidisciplinary
Lu Guo, Denis Lacroix, Nicolas Schunck, Cedric Simenel, Paul Stevenson
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Aurel Bulgac, Ibrahim Abdurrahman, Shi Jin, Kyle Godbey, Nicolas Schunck, Ionel Stetcu
Summary: The intrinsic spins and their correlations of fission fragments are poorly understood characteristics from both theoretical and experimental perspectives. Interaction mechanisms and conservation laws control the intrinsic excitation energies along with the intrinsic spins and parities of the fragments, leading to correlations and determining the character of their deexcitation mechanism. Within a fully microscopic framework, new qualitative features have been observed in the fission fragment intrinsic spin distributions, shedding light on debates that have spanned over six decades without definitive conclusions.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
J. Luis Egido, Andrea Jungclaus
Summary: The first triaxial beyond-mean-field study of the excitation spectra of even-even superheavy nuclei was conducted, focusing on the alpha-decay chains of (292)Lv and (294)Og. Configuration-mixing calculations were performed to predict the collective band structures and characteristics of these nuclei, with discussion on the prospect of observing alpha-decay fine structures in future experiments.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
K. Banerjee, D. J. Hinde, M. Dasgupta, J. Sadhukhan, E. C. Simpson, D. Y. Jeung, C. Simenel, B. M. A. Swinton-Bland, E. Williams, L. T. Bezzina, I. P. Carter, K. J. Cook, H. M. Albers, Ch E. Dullmann, J. Khuyagbaatar, B. Kindler, B. Lommel, C. Mokry, E. Prasad, J. Runke, N. Schunck, C. Sengupta, J. F. Smith, P. Thorle-Pospiech, N. Trautmann, K. Vo-Phuoc, J. Walshe, A. Yakushev
Summary: Measurements were made on fission-like outcomes in reactions forming flerovium isotopes using different projectiles, revealing that the dominant fast quasifission process masks the presence of fusion-fission. Results show a weak evidence for a super-asymmetric fission component, with a consistently required near symmetric fission component for a specific reaction, indicating lower fusion probabilities compared to previous results.
Article
Computer Science, Interdisciplinary Applications
P. Marevic, N. Schunck, E. M. Ney, R. Navarro Perez, M. Verriere, J. O'Neal
Summary: We describe the new version 4.0 of the HFBTHO code, which introduces new capabilities and improvements for solving the nuclear Hartree-Fock-Bogoliubov problem. The new version implements the restoration of rotational, particle number, and reflection symmetry for even even nuclei, and also improves the calculation of the SeaLL1 functional and the Coulomb potential. The code has been refactored to enhance maintainability and facilitate future developments.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Review
Physics, Nuclear
Nicolas Schunck, David Regnier
Summary: Atomic nuclei are systems composed of protons and neutrons held together by strong nuclear forces. Nuclear fission is a phenomenon where nuclei can break into fragments and decay by emitting particles. Understanding this complex process is crucial for studying atomic nuclei.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2022)
Article
Astronomy & Astrophysics
Rodrigo Navarro Perez, Nicolas Schunck
Summary: Predictions of nuclear properties far from measured data are inherently inaccurate due to uncertainties in nuclear forces and quantum many-body effects. Current approaches lose predictive power when input variables are far from the training region, resulting in uncontrolled uncertainties. This letter presents a new technique to identify input variables for machine learning algorithms that can provide robust estimates of model bias, improving theoretical predictions without increasing uncertainties.
Article
Physics, Multidisciplinary
Marc Verriere, Nicolas Schunck, Irene Kim, Petar Marevic, Kevin Quinlan, Michelle N. Ngo, David Regnier, Raphael David Lasseri
Summary: This paper reviews different approaches to applying machine learning and artificial intelligence techniques to nuclear density functional theory, with the aim of accelerating the generation of suitable DFT wavefunction basis.
FRONTIERS IN PHYSICS
(2022)
Article
Physics, Nuclear
N. Schunck, M. Verriere, G. Potel Aguilar, R. C. Malone, J. A. Silano, A. P. D. Ramirez, A. P. Tonchev
Summary: Fission data are crucial for nucleosynthesis simulations and nuclear forensics. The characteristics of fission for odd-mass nuclei, as well as even-even nuclei, are important in various applications. Fission theories that aim at describing fission dynamics are usually based on nuclear mean-field theories. In this article, we use the blocking prescription of the Hartree-Fock-Bogoliubov theory with Skyrme energy functionals to investigate odd-mass uranium isotopes. Our results show that the fission fragment distributions depend significantly on the spin of the odd neutron. We propose a methodology based on the calculation of the spin distribution to predict the charge and mass distributions in odd-mass nuclei.
Article
Physics, Multidisciplinary
Karolina Kolos, Vladimir Sobes, Ramona Vogt, Catherine E. Romano, Michael S. Smith, Lee A. Bernstein, David A. Brown, Mary T. Burkey, Yaron Danon, Mohamed A. Elsawi, Bethany L. Goldblum, Lawrence H. Heilbronn, Susan L. Hogle, Jesson Hutchinson, Ben Loer, Elizabeth A. McCutchan, Matthew R. Mumpower, Ellen M. O'Brien, Catherine Percher, Patrick N. Peplowski, Jennifer J. Ressler, Nicolas Schunck, Nicholas W. Thompson, Andrew S. Voyles, William Wieselquist, Michael Zerkle
Summary: Accurate nuclear data is crucial for advances in various fields, and outdated or incomplete data can hinder progress and compromise safety. Collaboration across organizations and international borders is essential in addressing the shared needs for nuclear data.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Nuclear
E. M. Ney, J. Engel, N. Schunck
Summary: In heavy nuclei, two-body weak currents have systematic effects on Gamow-Teller strength and beta-decay rates. The quenching effect of two-body currents decreases as the neutron excess increases, and they can enhance low-lying transitions. These effects are related to changes in total nucleon density.
Article
Physics, Nuclear
Petar Marevic, Nicolas Schunck, Jorgen Randrup, Ramona Vogt
Summary: This study provides microscopic calculations of angular-momentum distributions in fission fragments, revealing that the heavy fragments typically carry less angular momentum than their light partners due to nuclear shell structure and deformation. The dependence of angular momenta on fragment mass after the emission of neutrons and statistical photons shows different patterns for heavy and light fragments, consistent with recent experimental data. Using microscopic angular-momentum distributions significantly modifies the number of emitted photons.
Article
Physics, Nuclear
Marc Verriere, Nicolas Schunck, David Regnier
Summary: This study combines a fully microscopic collective model with an extension of the particle number projection formalism to provide the highest-fidelity prediction of the primary fission fragment distributions for U-235 and Pu-239 neutron-induced fission, and enables the realistic determination of two-dimensional isotopic yields within nuclear density functional theory for the first time.
