Nuclear Theory·nucl-th

Thursday·June 1, 2023

8 papers—4 primary·4 cross-listed

01
[Submitted on 30 May 2023]
Density Dependence of the Symmetry Energy in the Post PREX-CREX Era
Brendan T. Reed · F. J. Fattoyev · C. J. Horowitz · J. Piekarewicz
The recently published CREX results suggest a rather peculiar picture for the density dependence of the symmetry energy. Whereas PREX favors a large neutron skin thickness in $^{208}$ Pb, thereby suggesting a stiff equation of state, CREX suggests instead a much softer equation of state. This discrepancy has caused a large spur in the theoretical community since no model has been able to simultaneously reproduce within $1 σ$ the PREX and CREX results. Motivated by a novel correlation between a CREX observable and a combination of bulk symmetry energy parameters, we calibrate three new covariant energy density functionals that reproduce binding energies and charge radii of spherical nuclei - and also accommodate the constraints imposed by PREX and CREX. Given that these models suggest a stiff equation of state at high densities, predictions for neutron star properties are also discussed.
Comments:
10 pages, resubmitted to PRC
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2305.19376 [pdf]
PRC(2024)·66 citations
02
[Submitted on 31 May 2023]
Uncertainties in ab initio nuclear structure calculations with chiral interactions
P. Maris · H. Le · A. Nogga · R. Roth · J.P. Vary
We present theoretical ground state energies and their uncertainties for p-shell nuclei obtained from chiral effective field theory internucleon interactions as a function of chiral order, fitted to two- and three-body data only. We apply a Similary Renormalization Group transformation to improve the numerical convergence of the many-body calculations, and discuss both the numerical uncertainties arising from basis truncations and those from omitted induced many-body forces, as well as chiral truncation uncertainties. With complete Next-to-Next-to-Leading (N2LO) order two- and three-body interactions, we find significant overbinding for the ground states in the upper p-shell, but using higher-order two-body potentials, in combination with N2LO three-body forces, our predictions agree with experiment throughout the p-shell to within our combined estimated uncertainties. The uncertainties due to chiral order truncation are noticeably larger than the numerical uncertainties, but they are expected to become comparable to the numerical uncertainties at complete N3LO.
Comments:
19 pages, 7 tables, 4 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2305.19648 [pdf]
Front.in Phys.(2023)·12 citations
03
[Submitted on 31 May 2023]
Many-body correlations for nuclear physics across scales: from nuclei to quark-gluon plasmas to hadron distributions
Giuliano Giacalone🇩🇪
It is an experimental fact that multi-particle correlations in the final states of high-energy nucleus-nucleus collisions are sensitive to collective correlations of nucleons in the wave functions of the colliding nuclei. Here, I show that this connection is more direct than it intuitively seems. With an energy deposition scheme inspired by high-energy quantum chromodynamics, and within a linearized description of initial-state fluctuations in the quark-gluon plasma, I exhibit relations between $N$ -particle correlations in the final states of nuclear collisions and $N$ -nucleon density distributions in the colliding nuclei. This result formally justifies the sensitivity of the outcome of high-energy collisions to features such as nuclear deformations. It paves the way, thus, to systematic studies of the impact of state-of-the-art nuclear interactions in such processes.
Comments:
23 pages; 6 figures; ancillary files contain Monte Carlo simulator (py-Jazma.py) and data analysis code (py-Jazma_analysis.py); v2 matches the published version: fixed Eqs (37) and (41), removed discussion leading to previous Eq (57), improved description of the Monte Carlo generator in Sec. 6.1, removed previous Eq (74) from the Conclusion
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2305.19843 [pdf]
EPJA(2023)·43 citations
04
[Submitted on 31 May 2023]
Transfer reactions of exotic nuclei including core deformations: $^{11}$ Be and $^{17}$ C
P. Punta · J. A. Lay · A. M. Moro
Background: Reactions with halo nuclei from deformed regions exhibit important deviations from the inert core+valence picture. Structure and reaction formalisms have recently been extended or adapted to explore the possibility of exciting the underlying core. Purpose: We will study up to what extent transfer reactions involving halo nuclei $^{11}$ Be and $^{17}$ C can be reproduced with two different models that have previously shown a good success reproducing the role of the core in light halo nuclei. Methods: We focus on the structure of $^{11}$ Be and $^{17}$ C with two core+valence models: Nilsson and a semi-microscopic particle-rotor model using Antisymmetrized Molecular Dinamic calculations of the cores. These models are later used to study $^{16}$ C(d,p) $^{17}$ C and $^{11}$ Be(p,d) $^{10}$ Be transfer reactions within the Adiabatic Distorted Wave Approximation. Results are compared with three different experimental data sets. Results: A good reproduction of both the structure and transfer reactions of $^{10}$ Be and $^{17}$ C is found. The Nilsson model provides an overall better agreement for the spectrum and reactions involving $^{17}$ C while the semi-microscopic model is more adequate for $^{11}$ Be, as expected, since the $^{17}$ C core is closer to an ideal rotor. Conclusions: Both models show promising results for the study of transfer reactions with halo nuclei. We expect that including microscopic information in the Nilsson model, following the spirit of the semi-microscopic model, can provide a useful, yet simple framework for studying newly discovered halo nuclei.
Comments:
11 pages, 11 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2305.19945 [pdf]
PRC(2023)·11 citations
05
[Submitted on 30 May 2023] (cross-list from hep-ph)
Renormalons in the energy-energy correlator
Stella T. Schindler🇺🇸 · Iain W. Stewart🇺🇸 · Zhiquan Sun🇺🇸
The energy-energy correlator (EEC) is an observable of wide interest for collider physics and Standard Model measurements, due to both its simple theoretical description in terms of the energy-momentum tensor and its novel features for experimental studies. Significant progress has been made in both applications and higher-order perturbative predictions for the EEC. Here, we analyze the nature of the asymptotic perturbative series for the EEC by determining its analytic form in Borel space under the bubble-sum approximation. This result provides information on the leading and subleading nonperturbative power corrections through renormalon poles. We improve the perturbative convergence of the $MS$ series for the EEC by removing its leading renormalon using an R scheme, which is independent of the bubble-sum approximation. Using the leading R-scheme power correction determined by fits to thrust, we find good agreement with EEC OPAL data already at $O (α_{s}^{2})$ .
Comments:
19 pages + references, 6 figures; v2: update to fix a typo in the plotting routine for Figure 6
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2305.19311 [pdf]
JHEP(2023)·60 citations
06
[Submitted on 30 May 2023] (cross-list from hep-ph)
A closer look at the Yukawa's interaction from a symmetry group perspective
Luiz L. Lopes🇧🇷
I investigate the use of the SU(3) Clebsch-Gordan coefficients in light of the relations of completeness and closure. I show that in the case of $α_{V} = F / (F + D) \neq =$ 1, there is an additional interaction: the exchange of a $ρ$ meson between a $Λ$ and a $Σ^{0}$ hyperon that only affects the symmetric coupling. I then calculate these additional coupling constants and show that this recovers the completeness and closure of the SU(3) Clebsch-Gordan coefficients for all values of $α_{V}$ . Besides, it increases the symmetry of the theory, once now we can group the baryon octet into four doublets. Finally, I add the new coupling constants to study numerical results in the hyperon onset in dense nuclear matter assuming $α_{V}$ as a free parameter.
Comments:
16 pages, published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2305.19388 [pdf]
PTEP(2023)·6 citations
07
[Submitted on 31 May 2023] (cross-list from quant-ph)
Optimizing rodeo projection
Thomas D. Cohen🇺🇸 · Hyunwoo Oh🇺🇸
The rodeo algorithm has been proposed recently as an efficient method in quantum computing for projection of a given initial state onto a state of fixed energy for systems with discrete spectra. In the initial formulation of the rodeo algorithm these times were chosen randomly via a Gaussian distribution with fixed RMS times. In this paper it is shown that such a random approach for choosing times suffers from exponentially large fluctuations in the suppression of unwanted components: as the number of iterations gets large, the distribution of suppression factors obtained from random selection approaches a log-normal distribution leading to remarkably large fluctuations. We note that by choosing times intentionally rather than randomly such fluctuations can be avoided and strict upper bounds on the suppression can be obtained. Moreover, the average suppression using fixed computational cost can be reduced by many orders of magnitude relative to the random algorithm. A key to doing this is to choose times that vary over exponentially many times scales, starting from a modest maximum scale and going down to time scales exponentially smaller.
Comments:
17 pages, 6 figures
Subjects:
Quantum Physics (quant-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2305.19952 [pdf]
PRA(2023)·16 citations
08
[Submitted on 31 May 2023] (cross-list from hep-ph)
Jet quenching in mini-quark-gluon plasma: Medium modification factor $I_{p A}$ for photon-tagged jets
B.G. Zakharov🇷🇺
We calculate the medium modification factor $I_{p A}$ for the photon-tagged jet fragmentation functions for scenario with the quark-gluon plasma formation in $p A$ and $pp$ collisions. We perform calculations of radiative and collisional parton energy loss in the quark-gluon plasma with running $α_{s}$ which has a plateau around $Q \sim κ T$ with $κ$ fitted to the LHC data on the heavy ion $R_{AA}$ . We find that the theoretical prediction for $I_{p A}$ in $5.02$ TeV $p$ +Pb collisions are within errors consistent with the data from ALICE [1]. However, a definite conclusion about the presence or absence of jet quenching in $p A$ collisions cannot be drawn due to large experimental errors of the ALICE data [1]. Our calculations show that this requires a significantly more accurate measurement of $I_{p A}$ .
Comments:
7 pages, 1 figure
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2305.19989 [pdf]
JETP Lett.(2023)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE