Nuclear Theory·nucl-th

Friday·October 9, 2020

11 papers—5 primary·6 cross-listed

01
[Submitted on 8 Oct 2020]
Light fragment and neutron emission in high-energy proton induced spallation reactions
Hui-Gan Cheng · Zhao-Qing Feng
The dynamics of high-energy proton-induced spallation reactions on target nuclides of $^{136}$ Xe, $^{59}$ Ni, $^{56}$ Fe, $^{208}$ Pb, $^{184}$ W, $^{181}$ Ta, $^{197}$ Au and $^{112}$ Cd, are investigated with the quantum molecular dynamics transport model. The production mechanism of light nuclides and fission fragments is thoroughly analyzed. The statistical code GEMINI is employed in conjunction to the model for managing the decay of primary fragments. For the treatment of cluster emission during the preequilibrium stage, a surface coalescence model is implemented into the model. It is found that the available data of total cross sections are well reproduced with the combined approach for the spallation reactions on both the heavy and light targets, i.e., $^{56}$ Fe and $^{208}$ Pb, while it is underestimated in the intermediate-mass-fragment region for the medium-mass target $^{136}$ Xe. The energetic clusters are mainly contributed from the preequilibrium recognition, in which the quantum tunneling is taken into account. On the other hand, a fairly well overall description of light cluster and neutron emission is obtained and detailed discrepancies with respect to the experimental results are discussed. Possible modifications on the description of spallation reactions are stressed and compared with both recent experimental and theoretical results in the literature.
Comments:
12 pages, 7 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2010.03715 [pdf]
CPC(2021)·5 citations
02
[Submitted on 8 Oct 2020]
Search for determining the role of various physical properties of the fusion reactions in the proximity formalism
Reza Gharaei · Elham Sarvari
This work is focused on the analysis of the corrective effects of the temperature, surface tension, and nuclear matter density on the fusion barriers and also fusion cross sections caused by the original version of the proximity formalism (Prox.77 model) for 62 fusion reactions. A systematic comparison between the theoretical and empirical data of the height and position of the barrier as well as the fusion cross sections reveals that the agreement of these data improves by imposing each of the mentioned physical effects on the Prox.77 model for our selected mass range. Moreover, it is shown that the density-dependence effects have the most important role in improving the theoretical results of the proximity potential.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2010.03816 [pdf]
0 citations
03
[Submitted on 8 Oct 2020]
Partial wave correlations with uncertainties in the Two Nucleon System
Adolfo Guevara🇪🇸 · Rodrigo Navarro Pérez🇺🇸 · Enrique Ruiz Arriola🇪🇸
The NN scattering problem is usually analyzed in terms of partial waves and the corresponding coupled channel phase-shifts and mixing angles, but the available experiments induce correlations amongst the corresponding channels with different quantum numbers. Based on the Granada-2013 database we analyze the meaning and impact of those correlations taking into account both the purely statistical ones reflecting the primary experimental data uncertainties as well as the systematic ones exhibiting the ambiguities in the form of the potential representing the unknown nuclear force for distances below 3fm. We also ponder on the implications of fixing nuclear potentials by direct fits to the phase-shifts stemming from a full fledged partial wave analysis (PWA) inferred from experimental data.
Comments:
10 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2010.03885 [pdf]
PRC(2021)·2 citations
04
[Submitted on 8 Oct 2020]
Nuclear Pairing Gaps and Neutron Star Cooling
Jin-Biao Wei · Fiorella Burgio · Hans-Josef Schulze
We study the cooling of isolated neutron stars with particular regard to the importance of nuclear pairing gaps. A microscopic nuclear equation of state derived in the Brueckner-Hartree-Fock approach is used together with compatible neutron and proton pairing gaps. We then study the effect of modifying the gaps on the final deduced neutron star mass distributions. We find that a consistent description of all current cooling data can be achieved and a reasonable neutron star mass distribution can be predicted employing the (slightly reduced by about 40\%) proton 1S0 Bardeen-Cooper-Schrieffer (BCS) gaps and no neutron 3P2 pairing.
Comments:
18 pages, 6 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
2010.03916 [pdf]
Universe(2020)·9 citations
05
[Submitted on 8 Oct 2020]
Quasielastic Electromagnetic Scattering Cross Sections and World Data Comparisons in the {\fontfamily{qcr}\selectfont GENIE} Monte Carlo Event Generator
Joshua L. Barrow🇺🇸 · Steven Gardiner🇺🇸 · Saori Pastore🇺🇸 · Minerba Betancourt🇺🇸 · Joseph Carlson🇺🇸
The usage of Monte Carlo neutrino event generators (MC $ν$ EGs) is a norm within the high-energy $ν$ scattering community. The relevance of quasielastic (QE) energy regimes to $ν$ oscillation experiments implies that accurate calculations of $ν A$ cross sections in this regime will be a key contributor to reducing the systematic uncertainties affecting the extraction of oscillation parameters. In spite of this, many MC $ν$ EGs utilize highly phenomenological, parameterized models of QE scattering cross sections. Moreover, a culture of validation of MC $ν$ EGs against prolific electron ( $e$ ) scattering data has been historically lacking. In this work, we implement new $e A$ cross sections obtained from nuclear ab initio approaches in GENIE, the primary MC $ν$ EG utilized by the FNAL community. In particular, we utilize results from Quantum MC methods which solve the many-body nuclear problem in the Short-Time Approximation (STA), allowing consistent retention of two-nucleon dynamics which are crucial to explain available nuclear electromagnetic (electroweak) data over a wide range of energy and momentum transfers. This new implementation in GENIE is fully tested against the world QE electromagnetic data, finding agreement with available data below $\sim 2$ GeV of beam energy with the aid of a scaling function formalism. The STA is currently limited to study $A \leq 12$ nuclei, however, its semi-inclusive multibody identity components are exportable to other many-body computational techniques such as Auxiliary Field Diffusion MC which can reach $A \leq 40$ systems while continuing to realize the factorization contained within the STA's multinucleon dynamics. Together, these developments promise to make future experiments such as DUNE more accurate in their assessment of MC $ν$ EG systematics, $ν$ properties, and potentially empower the discovery of physics beyond the Standard Model.
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2010.04154 [pdf]
PRD(2021)·13 citations
06
[Submitted on 7 Oct 2020] (cross-list from hep-ph)
Quantum simulation of open quantum systems in heavy-ion collisions
Wibe A. de Jong🇺🇸 · Mekena Metcalf🇺🇸 · James Mulligan🇺🇸 · Mateusz Płoskoń🇺🇸 · Felix Ringer🇺🇸 · Xiaojun Yao🇺🇸
We present a framework to simulate the dynamics of hard probes such as heavy quarks or jets in a hot, strongly-coupled quark-gluon plasma (QGP) on a quantum computer. Hard probes in the QGP can be treated as open quantum systems governed in the Markovian limit by the Lindblad equation. However, due to large computational costs, most current phenomenological calculations of hard probes evolving in the QGP use semiclassical approximations of the quantum evolution. Quantum computation can mitigate these costs, and offers the potential for a fully quantum treatment with exponential speedup over classical techniques. We report a simplified demonstration of our framework on IBM Q quantum devices, and apply the Random Identity Insertion Method (RIIM) to account for CNOT depolarization noise, in addition to measurement error mitigation. Our work demonstrates the feasibility of simulating open quantum systems on current and near-term quantum devices, which is of broad relevance to applications in nuclear physics, quantum information, and other fields.
Comments:
Published in Phys Rev D
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2010.03571 [pdf]
PRD(2021)·68 citations
07
[Submitted on 7 Oct 2020] (cross-list from hep-th)
A New Paradigm for Topological or Rotational Non-Abelian Gauge Fields from Einstein-Skyrme Holography
Casey Cartwright🇺🇸 · Benjamin Harms🇺🇸 · Matthias Kaminski🇺🇸
We report analytically known states at non-zero temperature which may serve as a powerful tool to reveal common topological and thermodynamic properties of systems ranging from the QCD phase diagram to topological phase transitions in condensed matter materials. In the holographically dual gravity theory, these are analytic solutions to a five-dimensional non-linear-sigma (Skyrme) model dynamically coupled to Einstein gravity. This theory is shown to be holographically dual to $N = 4$ Super-Yang-Mills theory coupled to an $S U (2)$ -current. All solutions are fully backreacted asymptotically Anti-de Sitter~(AdS) black branes or holes. One family of global AdS black hole solutions contains non-Abelian gauge field configurations with positive integer Chern numbers and finite energy density. Larger Chern numbers increase the Hawking-Page transition temperature. In the holographically dual field theory this indicates a significant effect on the deconfinement phase transition. Black holes with one Hawking temperature can have distinct Chern numbers, potentially enabling topological transitions. A second family of analytic solutions, rotating black branes, is also provided. These rotating solutions induce states with propagating charge density waves in the dual field theory. We compute the Hawking temperature, entropy density, angular velocity and free energy for these black holes/branes. These correspond to thermodynamic data in the dual field theory. For these states the energy-momentum tensor, (non-)conserved current, and topological charge are interpreted.
Comments:
v2: added heat capacities (with plot), presentation improved; 48 pages, 5 figures. Comments are welcome!
Subjects:
High Energy Physics — Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
arXiv:
2010.03578 [pdf]
JHEP(2021)·7 citations
08
[Submitted on 7 Oct 2020] (cross-list from astro-ph.HE)
Constraining three-nucleon forces with multimessenger data
Andrea Maselli🇮🇹 · Andrea Sabatucci🇮🇹 · Omar Benhar🇮🇹
We report the results of a study aimed at inferring direct information on the repulsive three-nucleon potential $V_{ij k}^{R}$ \textemdash driving the stiffness of the nuclear matter equation of state at supranuclear densities\textemdash from astrophysical observations. Using a Bayesian approach, we exploit the measurements of masses, radii and tidal deformabalities performed by the NICER satellite and the LIGO/Virgo collaboration, as well as the mass of the heaviest observed pulsar, to constrain the strength of $V_{ij k}^{R}$ . The baseline of our analysis is the widely employed nuclear Hamiltonian comprising the Argonne $v_{18}$ nucleon-nucleon potential andthe Urbana IX model of three-nucleon potential. The numerical results, largely determined by the bound on the maximum mass, suggest that existing and future facilities have the potential to provide valuable new insight into microscopic nuclear dynamics at supranuclear densities.
Comments:
Discussion of the results extended. Various changes to match the version in press on Phys. Rev. C
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2010.03581 [pdf]
PRC(2021)·26 citations
09
[Submitted on 7 Oct 2020] (cross-list from astro-ph.HE)
Modeling Kilonova Light Curves: Dependence on Nuclear Inputs
Y. L. Zhu · K. Lund · J. Barnes · T. M. Sprouse · N. Vassh · G. C. McLaughlin · M. R. Mumpower · R. Surman
The mergers of binary neutron stars, as well as black hole-neutron star systems, are expected to produce an electromagnetic counterpart that can be analyzed to infer the element synthesis that occurred in these events. We investigate one source of uncertainties pertinent to lanthanide-rich outflows: the nuclear inputs to rapid neutron capture nucleosynthesis calculations. We begin by examining thirty-two different combinations of nuclear inputs: eight mass models, two types of spontaneous fission rates, and two types of fission daughter product distributions. We find that such nuclear physics uncertainties typically generate at least one order of magnitude uncertainty in key quantities such as the nuclear heating (one and a half orders of magnitude at one day post-merger), the bolometric luminosity (one order of magnitude at five days post-merger), and the inferred mass of material from the bolometric luminosity (factor of eight when considering the eight to ten days region). Since particular nuclear processes are critical for determining the electromagnetic signal, we provide tables of key nuclei undergoing $β$ -decay, $α$ -decay, and spontaneous fission important for heating at different times, identifying decays that are common among the many nuclear input combinations.
Comments:
29 pages, 17 figures, 4 tables
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2010.03668 [pdf]
ApJ(2021)·112 citations
10
[Submitted on 8 Oct 2020] (cross-list from hep-ph)
Phenomenological constraints on the transport properties of QCD matter with data-driven model averaging
D. Everett🇺🇸 · W. Ke🇺🇸 · J.-F. Paquet🇺🇸 · G. Vujanovic🇺🇸 · S. A. Bass🇺🇸 · L. Du🇺🇸 · C. Gale🇨🇦 · M. Heffernan🇨🇦 · U. Heinz🇺🇸 · D. Liyanage🇺🇸 · M. Luzum🇧🇷 · A. Majumder🇺🇸 and 36 other authors
Using combined data from the Relativistic Heavy Ion and Large Hadron Colliders, we constrain the shear and bulk viscosities of quark-gluon plasma (QGP) at temperatures of $\sim 150 - 350$ MeV. We use Bayesian inference to translate experimental and theoretical uncertainties into probabilistic constraints for the viscosities. With Bayesian Model Averaging we account for the irreducible model ambiguities in the transition from a fluid description of the QGP to hadronic transport in the final evolution stage, providing the most reliable phenomenological constraints to date on the QGP viscosities.
Comments:
8 pages, 3 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2010.03928 [pdf]
PRL(2021)·256 citations
11
[Submitted on 8 Oct 2020] (cross-list from nucl-ex)
Direct reaction contribution in the very low energy $^{19}$ F(p, $α_{0}$ ) reaction
Lalit Kumar Sahoo · Chinmay Basu
The direct reaction component of the $^{19}$ F(p, $α_{0}$ ) reaction at E $_{c m}$ =180-600 keV is studied for the data that has become very recently available. This component has been found to be significant in the present work using the direct pickup model in framework of the DWBA formalism and indicate the strong cluster structure of $^{19}$ F.
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2010.03937 [pdf]
IJMPE(2021)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE