Nuclear Theory·nucl-th

Monday·January 9, 2023

5 papers—3 primary·2 cross-listed

01
The shape of gold
Benjamin Bally🇫🇷 · Giuliano Giacalone🇩🇪 · Michael Bender🇫🇷
Having a detailed theoretical knowledge of the low-energy structure of the heavy odd-mass nucleus $^{197}$ Au is of prime interest as the structure of this isotope represents an important input to theoretical simulations of collider experiments involving gold ions performed worldwide at relativistic energies. In the present article, therefore, we report on new results on the structure of $^{197}$ Au obtained from state-of-the-art multi-reference energy density functional (MR-EDF) calculations. Our MR-EDF calculations were realized using the Skyrme-type pseudo-potential SLyMR1, and include beyond mean-field correlations through the mixing, in the spirit of the Generator Coordinate Method (GCM), of particle-number and angular-momentum projected triaxially deformed Bogoliubov quasi-particle states. Comparison with experimental data shows that the model gives a reasonable description of $^{197}$ Au with in particular a good agreement for most of the spectroscopic properties of the $3/ 2_{1}^{+}$ ground state. From the collective wave function of the correlated state, we compute an average deformation $β ˉ (3/ 2_{1}^{+}) = 0.13$ and $γ ˉ (3/ 2_{1}^{+}) = 4 0^{\circ}$ for the ground state. We use this result to construct an intrinsic shape of $^{197}$ Au representing a microscopically-motivated input for precision simulations of the associated collider processes. We discuss, in particular, how the triaxiality of this nucleus is expected to impact $^{197}$ Au+ $^{197}$ Au collision experiments at ultrarelativistic energy.
nucl-thnucl-exEPJA(2023)·39 citations
02
The exact description of intruder states in $^{112}$ Cd nucleus by using a mixing formalism based on $S U (1, 1)$ transitional Hamiltonian and $O (6)$ -Casimir operator
M. Rastgar · H. Sabri · A. O. Ezzati
In this paper, we used a transitional Hamiltonian which has $U (5) \leftrightarrow (6)$ transition to improve theoretical predictions for energy spectra and quadrupole transition rates of $^{112}$ Cd nucleus. To this aim, the transitional Hamiltonian in the affine $S U (1, 1)$ algebra has been extended by adding the $O (6)$ -Casimir operator and mixing Hamiltonian to increase exactness in the description of 4 $_{2}^{+}$ and 2 $_{3}^{+}$ intruder levels of this nucleus. We also considered the wave functions of both regular and intruder states, as a combination in the $N$ and $N + 2$ boson spaces. The results confirm the advantages of using such mixing approaches and describing the energy and transition rates with high accuracy
nucl-thIJMPE(2023)·1 citation
03
Quadrupole deformation signatures in elastic electron scattering from oriented odd-A nuclei
Pedro Sarriguren
Elastic electron scattering from oriented odd-Aaxially deformed nuclei is studied in the plane-wave Born approximation. The nuclear structure is described within a microscopic selfconsistent Skyrme deformed Hartree-Fock approximation with pairing correlations. The interference form factors between monopole and quadrupole Coulomb terms that characterize the nuclear response with aligned nuclear targets are shown to increase or decrease the unpolarized cross-section, depending on the sign of the quadrupole deformation. This feature provides valuable information on the nuclear deformation that can be used as a signature of the oblate or prolate character of the nuclear shape. Some selected cases of nuclei with different spins are presented that exemplify the scope of the method.
nucl-thPLB(2023)·2 citations
04
Gauge Sector Dynamics in QCD
M. N. Ferreira🇪🇸 · J. Papavassiliou🇪🇸
The dynamics of the gauge sector of QCD give rise to nonperturbative phenomena that are crucial for the internal consistency of the theory; most notably, they account for the generation of a gluon mass through the action of the Schwinger mechanism, the taming of the Landau pole and the ensuing stabilization of the gauge coupling, and the infrared suppression of the three-gluon vertex. In the present work, we review some key advances in the ongoing investigation of this sector within the framework of the continuum Schwinger function methods, supplemented by results obtained from lattice simulations.
↳ hep-phhep-lathep-thnucl-thParticles(2023)·97 citations
05
Hard jet substructure in a multistage approach
Y. Tachibana🇯🇵 · A. Kumar🇨🇦 · A. Majumder🇺🇸 · A. Angerami🇺🇸 · R. Arora🇺🇸 · S. A. Bass🇺🇸 · S. Cao🇨🇳 · Y. Chen🇺🇸 · T. Dai🇺🇸 · L. Du🇨🇦 · R. Ehlers🇺🇸 · H. Elfner🇩🇪 and 47 other authors
We present predictions and postdictions for a wide variety of hard jet-substructure observables using a multistage model within the JETSCAPE framework. The details of the multistage model and the various parameter choices are described in [A. Kumar et al., arXiv:2204.01163]. A novel feature of this model is the presence of two stages of jet modification: a high virtuality phase [modeled using the modular all twist transverse-scattering elastic-drag and radiation model (MATTER)], where modified coherence effects diminish medium-induced radiation, and a lower virtuality phase [modeled using the linear Boltzmann transport model (LBT)], where parton splits are fully resolved by the medium as they endure multiple scattering induced energy loss. Energy-loss calculations are carried out on event-by-event viscous fluid dynamic backgrounds constrained by experimental data. The uniform and consistent descriptions of multiple experimental observables demonstrate the essential role of modified coherence effects and the multistage modeling of jet evolution. Using the best choice of parameters from [A. Kumar et al., arXiv:2204.01163], and with no further tuning, we present calculations for the medium modified jet fragmentation function, the groomed jet momentum fraction $z_{g}$ and angular separation $r_{g}$ distributions, as well as the nuclear modification factor of groomed jets. These calculations provide accurate descriptions of published data from experiments at the Large Hadron Collider. Furthermore, we provide predictions from the multistage model for future measurements at the BNL Relativistic Heavy Ion Collider.
↳ hep-phhep-exnucl-exnucl-thPRC(2024)·47 citations

Affiliations

first authorsco-authorsvia INSPIRE

The shape of gold

The exact description of intruder states in 112Cd nucleus by using a mixing formalism based on SU(1,1) transitional Hamiltonian and O(6)-Casimir operator

Quadrupole deformation signatures in elastic electron scattering from oriented odd-A nuclei

Gauge Sector Dynamics in QCD

Hard jet substructure in a multistage approach

Affiliations

The exact description of intruder states in $^{112}$ Cd nucleus by using a mixing formalism based on $S U (1, 1)$ transitional Hamiltonian and $O (6)$ -Casimir operator