Tue·Aug 30, 2022Tuesday·August 30, 2022

1. 01*

   Low-$Q^2$ elastic electron-proton scattering using a gas jet target

   Y. Wang🇨🇳 · J. C. Bernauer🇺🇸 · B. S. Schlimme🇩🇪 · P. Achenbach🇩🇪 · S. Aulenbacher🇩🇪 · M. Ball🇩🇪 · M. Biroth🇩🇪 · D. Bonaventura🇩🇪 · D. Bosnar🇭🇷 · P. Brand🇩🇪 · S. Caiazza🇩🇪 · M. Christmann🇩🇪 and 45 other authors

   In this paper, we describe an experiment measuring low-$Q^2$ elastic electron-proton scattering using a newly developed cryogenic supersonic gas jet target in the A1 three-spectrometer facility at the Mainz Microtron. We measured the proton electric form factor within the four-momentum transfer range of $0.01\le Q^2\le 0.045(\text{GeV/c}{)}^2$. The experiment showed consistent results with the existing measurements. The data we collected demonstrated the feasibility of the gas jet target and the potential of future scattering experiments using high-resolution spectrometers with this gas jet target.

   nucl-exPRC(2022)·12 citations
2. 02*

   The Fundamental Nature of Low-Energy Pion-Nucleon Interactions

   Gerald A. Miller🇺🇸

   A historical review of pion-nucleon interactions at low energy is presented, with aims toward an introductory, pedagogic approach focusing on issues germane to current research. These topics include the use of chiral effective field theory, the sigma term, qualitative understanding of low-energy phase shifts, the physics of the $\Delta$ resonance, and isospin violation. A theme is that low-energy pion-nucleon scattering is directly related to QCD via effective field theory. Another theme is that modern needs regarding the pion-nucleon sigma term and the study of isospin violation requires a better low-energy data set.

   ↳ nucl-thnucl-ex2 citations
3. 03*

   Neutron-proton differential transverse flow in ${}^{132}$Sn + ${}^{124}$Sn collisions at 270 MeV/nucleon

   Xin Huang · Gao-Feng Wei🇨🇳 · Qi-Jun Zhi🇨🇳 · You-Chang Yang🇨🇳 · Zheng-Wen Long🇨🇳

   Within a transport model, we study the neutron-proton differential transverse flow and its excitation function in central ${}^{132}$Sn + ${}^{124}$Sn collisions at 270 MeV/nucleon. To more accurately evaluate effects of the high-density behavior of symmetry energy \esym on this observable, we also consider the uncertainties of \esym around the saturation density ${\rho }_0$. It is shown that the neutron-proton differential transverse flow and its excitation function are mainly sensitive to the slope $L$ of \esym at ${\rho }_0$. However, the effects of low-density behavior of \esym on this observable should also be considered. Therefore, it is suggested that measurements of the neutron-proton differential transverse flow and its excitation function may provide useful complements to the constraints on $L$ extracted from the spectral pion ratio in S$\pi$RIT experiments.

   ↳ nucl-thnucl-exPRC(2022)·4 citations
4. 04*

   Nuclear fragmentation reactions as a probe of neutron skins in nuclei

   E.A. Teixeira · T. Aumann🇩🇪 · C.A. Bertulani🇺🇸 · B.V. Carlson🇧🇷

   We investigate the contributions of various reaction channels to the interaction, reaction, charge-changing and neutron-changing cross sections. The goal is to investigate the relation between microscopic interactions and the symmetry energy component of the equation of state (EoS) of interest for the structure of neutron stars. We have made a comparison of the neutron skins extracted from diverse experimental techniques with those obtained with Hartree-Fock-Bogoliubov calculations with 23 Skyrme and with 8 density-dependent interactions used in the relativistic mean field method. We have shown that no particular conclusion can be drawn on the best EoS in view of the wide range of uncertainty in the experimental data. We have further investigated the prospects of using neutron-changing reactions to assess the isospin dependence of the neutron-skin in neutron-rich nuclei.

   ↳ nucl-thnucl-exEPJA(2022)·13 citations
5. 05*

   Meson resonance gas in a relativistic quark model: scalar vs vector confinement and semishort range correlations

   Toru Kojo🇯🇵 · Daiki Suenaga🇯🇵

   Smooth transitions from hadronic matter to hot and dense matter of quantum chromodynamics accompany continuous transformations in effective degrees of freedom. The microscopic descriptions should include relativistic quarks interacting inside of hadrons. In this work we construct a schematic constituent quark model with relativistic kinematics which captures the global trends of meson spectra in the light, strange, and charm quark sectors. We examine the roles of the scalar- and vector-confining potentials as well as semishort range correlations in estimating the strength of central, spin-spin, and spin-orbit interactions. The quark dynamics in low-lying mesons is very sensitive to relativistic kinematics and short range interactions, while in high-lying mesons are sensitive to the composition of scalar- and vector-confinement. After expressing mesons in terms of quark wave functions, we use them to describe the quark occupation probability in a meson resonance gas, and discuss how it can be related to its counterpart in a quark-gluon-plasma.

   ↳ hep-phhep-latnucl-exnucl-th5 citations
6. 06*

   Double $J/\psi$ production as a test of parton momentum correlations in double parton scattering

   Sergey Koshkarev🇪🇪 · Stefan Groote🇪🇪

   Using the GS09 model we predict the possible impact of the parton momentum correlation on the $J/\psi$-pair production at the Spin Physics Detector at the Nuclotron-based Ion Collider Facility. The double $J/\psi$ production and the effective cross sections are calculated.

   ↳ hep-phhep-exnucl-exPLB(2023)·2 citations
7. 07*

   Dynamics of Hot QCD Matter -- Current Status and Developments

   Santosh K. Das🇮🇳 · Prabhakar Palni🇮🇳 · Jhuma Sannigrahi🇮🇳 · Jan-e Alam🇮🇳 · Cho Win Aung🇮🇳 · Yoshini Bailung🇮🇳 · Debjani Banerjee🇮🇳 · Gergely Gábor Barnaföldi🇭🇺 · Subash Chandra Behera🇮🇳 · Partha Pratim Bhaduri🇮🇳 · Samapan Bhadury🇮🇳 · Rajesh Biswas🇮🇳 and 55 other authors

   The discovery and characterization of hot and dense QCD matter, known as Quark Gluon Plasma (QGP), remains the most international collaborative effort and synergy between theorists and experimentalists in modern nuclear physics to date. The experimentalists around the world not only collect an unprecedented amount of data in heavy-ion collisions, at Relativistic Heavy Ion Collider (RHIC), at Brookhaven National Laboratory (BNL) in New York, USA, and the Large Hadron Collider (LHC), at CERN in Geneva, Switzerland but also analyze these data to unravel the mystery of this new phase of matter that filled a few microseconds old universe, just after the Big Bang. In the meantime, advancements in theoretical works and computing capability extend our wisdom about the hot-dense QCD matter and its dynamics through mathematical equations. The exchange of ideas between experimentalists and theoreticians is crucial for the progress of our knowledge. The motivation of this first conference named "HOT QCD Matter 2022" is to bring the community together to have a discourse on this topic. In this article, there are 36 sections discussing various topics in the field of relativistic heavy-ion collisions and related phenomena that cover a snapshot of the current experimental observations and theoretical progress. This article begins with the theoretical overview of relativistic spin-hydrodynamics in the presence of the external magnetic field, followed by the Lattice QCD results on heavy quarks in QGP, and finally, it ends with an overview of experiment results.

   ↳ nucl-thhep-exhep-phhep-th+1IJMPE(2022)·39 citations
8. 08*

   A data-enabled physics-informed neural network with comprehensive numerical study on solving neutron diffusion eigenvalue problems

   Yu Yang · Helin Gong🇨🇳 · Shiquan Zhang · Qihong Yang · Zhang Chen🇨🇳 · Qiaolin He🇨🇳 · Qing Li🇨🇳

   We present a data-enabled physics-informed neural network (DEPINN) with comprehensive numerical study for solving industrial scale neutron diffusion eigenvalue problems (NDEPs). In order to achieve an engineering acceptable accuracy for complex engineering problems, a very small amount of prior data from physical experiments are suggested to be used, to improve the accuracy and efficiency of training. We design an adaptive optimization procedure with Adam and LBFGS to accelerate the convergence in the training stage. We discuss the effect of different physical parameters, sampling techniques, loss function allocation and the generalization performance of the proposed DEPINN model for solving complex problem. The feasibility of proposed DEPINN model is tested on three typical benchmark problems, from simple geometry to complex geometry, and from mono-energetic equation to two-group equations. Numerous numerical results show that DEPINN can efficiently solve NDEPs with an appropriate optimization procedure. The proposed DEPINN can be generalized for other input parameter settings once its structure been trained. This work confirms the possibility of DEPINN for practical engineering applications in nuclear reactor physics.

   ↳ physics.comp-phnucl-ex0 citations
9. 09*

   Isotope Shifts in Cadmium as a Sensitive Probe for Physics Beyond the Standard Model

   B. Ohayon🇨🇭 · S. Hofsäss🇩🇪 · J.E. Padilla-Castillo🇩🇪 · S. C. Wright🇩🇪 · G. Meijer🇩🇪 · S. Truppe🇩🇪 · K. Gibble🇺🇸 · B. K. Sahoo🇮🇳

   Isotope shifts (ISs) in atomic energy levels are sensitive probes of nuclear structure and new physics beyond the Standard Model. We present an analysis of the ISs of the cadmium atom (Cd I) and singly charged cadmium ion (Cd II). ISs of the 229 nm, 326 nm, 361 nm and 480 nm lines of Cd I are measured with a variety of techniques; buffer-gas-cooled beam spectroscopy, capturing atoms in a magneto-optic-trap, and optical pumping. IS constants for the D1 and D2 lines of Cd II are calculated with high accuracy by employing analytical response relativistic coupled-cluster theory in the singles, doubles and triples approximations. Combining the calculations for Cd II with experiments, we infer IS constants for all low-lying transitions in Cd I. We benchmark these constants as calculated via different many-body methods. Our calculations for Cd II enable nuclear charge radii of Cd isotopes to be extracted with unprecedented accuracy. The combination of our precise calculations and measurements shows that King Plots for Cd I can improve the state-of-theart sensitivity to a new heavy boson by up to two orders of magnitude.

   ↳ physics.atom-phnucl-exNew J.Phys.(2022)·16 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.