Nuclear Theory·nucl-th

Friday·October 7, 2022

11 papers—7 primary·4 cross-listed

01
[Submitted on 5 Oct 2022]
Bayesian probability updates using Sampling/Importance Resampling: Applications in nuclear theory
Weiguang Jiang · Christian Forssén
We review an established Bayesian sampling method called sampling/importance resampling and highlight situations in nuclear theory when it can be particularly useful. To this end we both analyse a toy problem and demonstrate realistic applications of importance resampling to infer the posterior distribution for parameters of $Δ$ NNLO interaction model based on chiral effective field theory and to estimate the posterior probability distribution of target observables. The limitation of the method is also showcased in extreme situations where importance resampling breaks.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2210.02507 [pdf]
Front.in Phys.(2022)·12 citations
02
[Submitted on 5 Oct 2022]
Proposal for a Nuclear Light Source
E. V. Tkalya · P. V. Borisyuk · M. S. Domashenko · Yu. Yu. Lebedinskii
The paper considers a principal possibility of creating a nuclear light source of the vacuum ultra violet (VUV) range based on the $^{229}$ Th nucleus. This nuclear light source can help to solve two main problems -- excitation of the low-lying $^{229 m}$ Th isomer and precision measurement of the nuclear isomeric transition energy. The Thorium nuclear light source is based on the nuclei implanted in a thin dielectric film with a large bandgap. While passing an electric current through the sample, the $^{229}$ Th nuclei are excited to the low energy isomeric state $3/ 2^{+} (8.19 \pm 0.12$ eV) in the process of inelastic scattering of conduction electrons. The subsequent spontaneous decay of $^{229 m}$ Th is followed by the emission of $γ$ quanta in the VUV range. The luminosity of the Thorium nuclear light source is approximately $1 0^{5}$ ~photons/s per 1~A of current and per 1~ng of $^{229}$ Th. The suggested scheme to obtain $γ$ radiation from the $^{229 m}$ Th isomer can be considered as a kind of nuclear analogue of the optical radiation from the usual metal-insulator-semiconductor (MIS) junction.
Comments:
8 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2210.02512 [pdf]
CPC(2023)·3 citations
03
[Submitted on 6 Oct 2022]
Nuclear symmetry energy and the PREX-CREX neutron skin puzzle within the KIDS framework
Panagiota Papakonstantinou
I briefly review the KIDS theoretical framework for the nuclear equation of state (EoS) and energy density functional (EDF), I discuss recent results for the curvature parameter of the symmetry energy, and I address the PREX-CREX puzzle. I show that it is possible to obtain EDF models which can reproduce both PREX-II and CREX results each within its respective error bars. Such EDFs correspond to EoSs which soften towards low densities, as could be attributed to clusterization. Before such a scenario is considered viable, the dipole polarizability should also be examined.
Comments:
10 pages incl. 1 figure; pilot study; prepared for the Proceedings of the 39th International Workshop on Nuclear Theory, Rila Mountains, Bulgaria, July 3-9, 2022
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2210.02696 [pdf]
Nucl.Theor.(2022)·14 citations
04
[Submitted on 6 Oct 2022]
Effect of isovector scalar meson on equation of state of dense matter within relativistic mean field model
Virender Thakur🇮🇳 · Raj Kumar🇮🇳 · Pankaj Kumar🇮🇳 · Vikesh Kumar🇮🇳 · Mukul Kumar🇮🇳 · C. Mondal🇫🇷 · B.K. Agrawal🇮🇳 · Shashi K. Dhiman🇮🇳
The effects of the isovector-scalar $δ$ -meson field on the properties of finite nuclei, infinite nuclear matter and neutron stars are investigated within the Relativistic Mean Field (RMF) model which includes non-linear couplings. Several parameter sets (SRV's) are generated to asses the influence of $δ$ -meson on the properties of neutron star. These parametrizations correspond to different values of coupling constant of $δ$ -meson to the nucleons with remaining ones calibrated to yield finite nuclei and infinite nuclear matter properties consistent with the available experimental data. It is observed that to fit the properties of finite nuclei and infinite nuclear matter, a stronger coupling between isovector-vector $ρ$ meson and nucleons is required in the presence of $δ$ field. Furthermore, the $δ$ -meson is found to affect the radius of canonical neutron star significantly. The value of dimensionless tidal deformability, $Λ$ for the canonical neutron star also satisfies the constraints from the waveform models analysis of GW170817 binary neutron star merger event. A covariance analysis is performed to estimate the statistical uncertainties of the model parameters as well as correlations among the model parameters and different observables of interest.
Comments:
10 pages, 5 figures (Accepted for publication in Phys. Rev. C (Sept. 2022)
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2210.02793 [pdf]
PRC(2022)·33 citations
05
[Submitted on 6 Oct 2022]
Single- & double-strangeness hypernuclei up to $A = 8$ within chiral effective field theory
H. Le🇩🇪
We investigate $S = - 1$ and $- 2$ hypernuclei with $A = 4 - 8$ employing the Jacobi-NCSM approach and in combination with baryon-baryon interactions derived within the frame work of chiral effective field theory. The employed interactions are transformed using the similarity renormalization group (SRG) so that the low- and high-momentum states are decoupled, and, thereby,convergence of the binding energies with respect to model space can be significantly speeded up. Such an evolution is however only approximately unitary when the so-called SRG induced higher-body forces are omitted. We first explore the impact of the SRG evolution on the $Λ$ separation energies $B_{Λ}$ in $A = 3 - 5$ hypernuclei when only SRG-evolved two-body and when both two- and three-body forces are included. For the latter scenario, we thoroughly study predictions of the two almost phase-equivalent NLO13 and NLO19 YN potentials for $A = 4 - 7$ hypernuclei. The NLO19 interaction yields separation energies that are comparable with experiment, whereas NLO13 underestimates all the systems considered. We further explore CSB splittings in the $A = 7, 8$ multiplets employing the two NLO YN potentials that include also the leading CSB potential in the $Λ$ N channel, whose strength has been fitted to the presently established CSB in $A = 4$ . Finally, we report on our recent study for $Ξ$ hypernuclei based on the $Ξ$ N interaction at NLO.
Comments:
8 pages, 1 figure. Contribution to Proceedings of the HYP2022 Conference, 27th June -1st July 2022, Prague
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2210.02860 [pdf]
EPJ Web Conf.(2022)·3 citations
06
[Submitted on 6 Oct 2022]
Nuclear binding energies in artificial neural networks
Lin-Xing Zeng · Yu-Ying Yin · Xiao-Xu Dong · Li-Sheng Geng
The binding energy (BE) or mass is one of the most fundamental properties of an atomic nucleus. Precise binding energies are vital inputs for many nuclear physics and nuclear astrophysics studies. However, due to the complexity of atomic nuclei and of the non-perturbative strong interaction, up to now, no conventional physical model can describe nuclear binding energies with a precision below 0.1 MeV, the accuracy needed by nuclear astrophysical studies. In this work, artificial neural networks (ANNs), the so called ``universal approximators", are used to calculate nuclear binding energies. We show that the ANN can describe all the nuclei in AME2020 with a root-mean-square deviation (RMSD) around 0.2 MeV, which is better than the best macroscopic-microscopic models, such as FRDM and WS4. The success of the ANN is mainly due to the proper and essential input features we identify, which contain the most relevant physical information, i.e., shell, paring, and isospin-asymmetry effects. We show that the well-trained ANN has excellent extrapolation ability and can predict binding energies for those nuclei so far inaccessible experimentally. In particular, we highlight the important role played by ``feature engineering'' for physical systems where data are relatively scarce, such as nuclear binding energies.
Comments:
18 pages, 8 figures, 3 tables
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2210.02906 [pdf]
PRC(2024)·20 citations
07
[Submitted on 6 Oct 2022]
Microscopic nucleus-nucleus optical potentials from nuclear matter with uncertainty analysis from chiral forces
T. R. Whitehead
Nucleus-nucleus optical potentials are constructed from an energy density functional approach first outlined by Brueckner et al. The interaction term of the energy density functional comes from the complex nucleon self-energy computed in nuclear matter with two- and three-body chiral nuclear forces. Nuclear density distributions are calculated from Skyrme functionals constrained to the equations of state calculated from the same chiral forces used for the self-energy. Predictions for elastic scattering cross sections and fusion cross sections are compared to experimental data. Very good agreement is found with experiment for elastic scattering of heavier nucleus-nucleus systems at energies in the range of $20 < E < 90$ MeV/N, while accurate descriptions of lighter and lower-energy systems may require the inclusion of collective excitations.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2210.03031 [pdf]
1 citation
08
[Submitted on 5 Oct 2022] (cross-list from hep-ph)
Form factor and model dependence in neutrino-nucleus cross section predictions
Daniel Simons🇺🇸 · Noah Steinberg🇺🇸 · Alessandro Lovato🇺🇸 · Yannick Meurice🇺🇸 · Noemi Rocco🇺🇸 · Michael Wagman🇺🇸
To achieve its design goals, the next generation of neutrino-oscillation accelerator experiments requires percent-level predictions of neutrino-nucleus cross sections supplemented by robust estimates of the theoretical uncertainties involved. The latter arise from both approximations in solving the nuclear many-body problem and in the determination of the single- and few-nucleon quantities taken as input by many-body methods. To quantify both types of uncertainty, we compute flux-averaged double-differential cross sections using the Green's function Monte Carlo and spectral function methods as well as different parameterizations of the nucleon axial form factors based on either deuterium bubble-chamber data or lattice quantum chromodynamics calculations. The cross-section results are compared with available experimental data from the MiniBooNE and T2K collaborations. We also discuss the uncertainties associated with $N \to Δ$ transition form factors that enter the two-body current operator. We quantify the relations between neutrino-nucleus cross section and nucleon form factor uncertainties. These relations enable us to determine the form factor precision targets required to achieve a given cross-section precision.
Comments:
Minor changes to text and figure labels
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2210.02455 [pdf]
J.Phys.G(2025)·26 citations
09
[Submitted on 6 Oct 2022] (cross-list from astro-ph.HE)
Internal Heating in Magnetars: Role of Electron Captures
Nicolas Chamel🇧🇪 · Anthea Francesca Fantina🇫🇷 · Lami Suleiman🇵🇱 · Julian-Leszek Zdunik🇵🇱 · Pawel Haensel🇵🇱
The role of electron captures by nuclei in the shallow heating of magnetars is further investigated using both nuclear measurements and the theoretical atomic mass table HFB-27. Starting from the composition of the outer crust in full equilibrium, we have calculated the onset of electron captures and the heat released due to the slow decay of the magnetic field. Numerical results are found to be similar to those previously obtained with the HFB-24 atomic mass model and are consistent with neutron-star cooling data.
Comments:
6 pages, 1 figure. Contribution to the proceedings of the XLIV Brazilian Workshop on Nuclear Physics
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2210.02790 [pdf]
J.Phys.Conf.Ser.(2022)·1 citation
10
[Submitted on 6 Oct 2022] (cross-list from hep-ph)
Studying chirality imbalance with quantum algorithms
Alexander M. Czajka🇺🇸 · Zhong-Bo Kang🇺🇸 · Yuxuan Tee🇺🇸 · Fanyi Zhao🇺🇸
To describe the chiral magnetic effect, the chiral chemical potential $μ_{5}$ is introduced to imitate the impact of topological charge changing transitions in the quark-gluon plasma under the influence of an external magnetic field. We employ the (1+1) dimensional Nambu-Jona-Lasinio (NJL) model to study the chiral phase structure and chirality charge density of strongly interacting matter with finite chiral chemical potential $μ_{5}$ in a quantum simulator. By performing the Quantum imaginary time evolution (QITE) algorithm, we simulate the (1+1) dimensional NJL model on the lattice at various temperature $T$ and chemical potentials $μ$ , $μ_{5}$ and find that the quantum simulations are in good agreement with analytical calculations as well as exact diagonalization of the lattice Hamiltonian.
Comments:
16 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2210.03062 [pdf]
7 citations
11
[Submitted on 6 Oct 2022] (cross-list from quant-ph)
Quantum computation of dynamical quantum phase transitions and entanglement tomography in a lattice gauge theory
Niklas Mueller🇺🇸 · Joseph A. Carolan🇺🇸 · Andrew Connelly🇺🇸 · Zohreh Davoudi🇺🇸 · Eugene F. Dumitrescu🇺🇸 · Kübra Yeter-Aydeniz🇺🇸
Strongly-coupled gauge theories far from equilibrium may exhibit unique features that could illuminate the physics of the early universe and of hadron and ion colliders. Studying real-time phenomena has proven challenging with classical-simulation methods, but is a natural application of quantum simulation. To demonstrate this prospect, we quantum compute non-equal time correlation functions and perform entanglement tomography of non-equilibrium states of a simple lattice gauge theory, the Schwinger model, using a trapped-ion quantum computer by IonQ Inc. As an ideal target for near-term devices, a recently-predicted [Zache et al., Phys. Rev. Lett. 122, 050403 (2019)] dynamical quantum phase transition in this model is studied by preparing, quenching, and tracking the subsequent non-equilibrium dynamics in three ways: i) overlap echos signaling dynamical transitions, ii) non-equal time correlation functions with an underlying topological nature, and iii) the entanglement structure of non-equilibrium states, including entanglement Hamiltonians. These results constitute the first observation of a dynamical quantum phase transition in a lattice gauge theory on a quantum computer, and are a first step toward investigating topological phenomena in nuclear and high-energy physics using quantum technologies.
Comments:
published journal version, additional shot noise error analysis, error-mitigation discussion, references added
Subjects:
Quantum Physics (quant-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2210.03089 [pdf]
PRX Quantum(2023)·97 citations

Affiliations

first authorsco-authorsvia INSPIRE