Nuclear Theory·nucl-th

Wednesday·July 3, 2024

10 papers—5 primary·5 cross-listed

01
[Submitted on 2 Jul 2024]
A sign of three-nucleon short-range correlation from an analysis of nuclear mass and short-range correlation probability
Na-Na Ma · Rong Wang
Three-nucleon short-range correlation ( $3 N$ SRC) represents a rare and intriguing part of the nuclear dynamics at short distance, beyond the two-nucleon short-range correlation ( $2 N$ SRC). To search its existence is a hot topic in the ongoing and future high-energy nuclear experiments and the developments of nuclear theory. In this study, we found a positive sign of $3 N$ SRC in nuclei, by analyzing the correlation between the per-nucleon nuclear mass and the probability of a nucleon in $2 N$ SRC state, with the current experimental measurements of $^{2}$ H, $^{3}$ He, $^{4}$ He, $^{9}$ Be, $^{12}$ C, $^{27}$ Al, $^{56}$ Fe, Cu, $^{197}$ Au and $^{208}$ Pb from SLAC, CLAS, and JLab Hall C collaborations. The effective masses of the nucleons in $2 N$ SRC and $3 N$ SRC are also extracted from the analysis, which provide some references for the nuclear medium effect study. The probability of $3 N$ SRC is much smaller than that of $2 N$ SRC, thus requiring high-luminosity experiments to confirm its existence.
Comments:
7 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2407.01882 [pdf]
EPJA(2025)·1 citation
02
[Submitted on 2 Jul 2024]
Benchmarking $Λ$ NN three-body forces and first predictions for A=3-5 hypernuclei
Hoai Le🇩🇪 · Johann Haidenbauer🇩🇪 · Hiroyuki Kamada🇯🇵 · Michio Kohno🇯🇵 · Ulf-G. Meißner🇩🇪 · Kazuya Miyagawa🇯🇵 · Andreas Nogga🇩🇪
Explicit expressions for the leading chiral hyperon-nucleon-nucleon three-body forces have been derived by Petschauer et al [Phys. Rev. C93.014001 (2016)]. An important prerequisite for including these three-body forces in few- and many-body calculations is the accuracy and efficiency of their partial-wave decomposition. A careful benchmark of the {\Lambda}NN potential matrix elements, computed using two robust and efficient partial-wave decomposition methods, is presented. In addition, results of a first quantitative assessment for the contributions of $Λ$ NN forces to the separation energies in A=3-5 hypernuclei are reported.
Comments:
10 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2407.02064 [pdf]
EPJA(2025)·14 citations
03
[Submitted on 2 Jul 2024]
Estimating Inverse Scattering Potentials for n-p System Using Variational Monte Carlo & Neural Networks
Anil Khachi · Gabor Balassa
The Riccati-type nonlinear differential equation, also known as the Variable Phase Approach or Phase Function Method, is used to construct local inverse potentials for the $ ^3S_1 $ and $ ^1S_0 $ states of the deuteron. The Morse potential has been optimized by adjusting parameters using the Variational Monte Carlo (VMC) and Multilayer Perceptron (MLP) type Neural Networks (NN). The inverse potentials obtained from VMC and NN show almost identical parameters. In VMC, all three parameters of the Morse potential are varied to obtain the phase shifts, while in NN, the 3D-parameter optimization problem is converted to a 1D-parameter optimization problem, thus reducing optimization parameters, time, and computational cost. Recently, the GRANADA group published a comprehensive partial wave analysis of scattering data, which includes 6713 $ np $ phase shift data points from 1950 to 2013. Using the final experimental data points from GRANADA, we obtained the parameters for the Morse potential by minimizing the mean square error (MSE) as the cost function. The MSE using VMC (NN) is found to be 0.65 (2.5) for the $ ^1S_0 $ state and 0.16 (0.22) for the $ ^3S_1 $ state. Various quantum functions, such as phase $ \delta(r) $, amplitude $ A(r) $, and wave function $ u(r) $, are described up to 5 fm with energies $ E_{\ell ab} = [1-350 \text{ MeV}] $.
Comments:
18 pages, 1 table, 8 figures, 26 references
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2407.02137 [pdf]
0 citations
04
[Submitted on 2 Jul 2024]
Vortex Rings in Event-by-Event Relativistic Heavy-Ion Collisions
David Dobrigkeit Chinellato🇧🇷 · Michael Annan Lisa🇺🇸 · Willian Matioli Serenone🇧🇷 · Chun Shen🇺🇸 · Jun Takahashi🇧🇷 · Giorgio Torrieri🇧🇷
We present event-by-event simulations for central asymmetric light+heavy and Au+Au collisions to investigate the formation and evolution of vortex-ring structures in the longitudinal flow velocity profile. The production-plane polarization of $Λ$ hyperons, defined w.r.t. the $Λ$ momentum and the beam, can track the "vortex-ring" feature in the event, a characteristic vortical structure generated by longitudinal flow gradients. We make comprehensive model predictions for the rapidity-dependent vortex-ring observables for different collision system sizes at $s_{NN} = 200$ and 72 GeV. Our predictions at the latter energy can be explored in the future LHCb fixed-target experiment at the Large Hadron Collider.
Comments:
10 pages, 11 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2407.02212 [pdf]
PRC(2024)·7 citations
05
[Submitted on 2 Jul 2024]
Calibrating the medium effects of light clusters in heavy-ion collisions
Tiago Custódio🇵🇹 · Alex Rebillard-Soulié🇫🇷 · Rémi Bougault🇫🇷 · Diego Gruyer🇫🇷 · Francesca Gulminelli🇫🇷 · Tuhin Malik🇵🇹 · Helena Pais🇵🇹 · Constança Providência🇵🇹
We propose a Bayesian inference estimation of in-medium modification of the cluster self-energies from light nuclei multiplicities measured in selected samples of central $^{136, 124}$ Xe $+^{124, 112}$ Sn collisions with the INDRA apparatus. The data are interpreted with a relativistic quasi-particle cluster approach in the mean-field approximation without any prior assumption on the thermal parameters of the model. An excellent reproduction is obtained for H and He isotope multiplicities, and compatible posterior distributions are found for the unknown thermal parameters. We conclude that the cluster- $σ$ -meson coupling is temperature dependent, becoming weaker when the temperature increases, in agreement with microscopic quantum statistical calculations. This implies a faster decrease of the light cluster abundances with temperature than previously estimated.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2407.02307 [pdf]
PRL(2025)·7 citations
06
[Submitted on 1 Jul 2024] (cross-list from hep-ph)
A chiral quark model analysis of the $K ˉ N$ interaction
M. Conde-Correa🇪🇨 · T. Aguilar🇪🇨 · A. Capelo-Astudillo🇪🇨 · A. Duenas-Vidal🇪🇨 · J. Segovia🇪🇸 · P. G. Ortega🇪🇸
In this work we analyze the $K ˉ N$ interaction in the framework of a constituent quark model. The near-threshold elastic and charge exchange cross sections are evaluated, finding a good agreement with the experimental data. Furthermore, the possible existence of $K ˉ N$ bound states are explored, finding two poles in the isoscalar $J^{P} = \frac{1}{2}^{-}$ sector that can be interpreted as the experimental $Λ (1405)$ state.
Comments:
7 pages, 2 figures, 3 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2407.01759 [pdf]
PRD(2024)·6 citations
07
[Submitted on 1 Jul 2024] (cross-list from physics.plasm-ph)
Electron Capture and Bound-State $β$ Decays in Ions and Plasma
Bharat Mishra · Angelo Pidatella · Simone Taioli · Stefano Simonucci · David Mascali
We present a new theory describing the variation of electron capture and bound-state $β$ -decays in atomic ions and (non) local thermodynamic equilibrium ((N)LTE) plasmas. We adopt the Takahashi-Yokoi nuclear model with added corrections to first calculate the decay rate for each atomic configuration of the isotope, and then evaluate the in-plasma decay rate by combining them with the charge state distribution (CSD) consistent with plasma density and temperature. Our approach expands the thermodynamic parameter space in which in-plasma $β$ -decays can be studied, opening the possibility to validate the model in low-density laboratory magnetoplasmas before application to stellar nucleosynthesis. The model is explained using $^{7}$ Be, and then applied to higher mass isotopes such as $^{140}$ Pr $^{0 +, 57 +, 58 +}$ , $^{142}$ Pm $^{0 +, 59 +, 60 +}$ and $^{163}$ Dy $^{66 +}$ . Our model is therefore amenable to isotopes in a wide range of masses, in both single charge state or in a plasma-generated CSD.
Comments:
15 pages, 12 figures, 6 tables. Submitted to Physical Review C
Subjects:
Plasma Physics (physics.plasm-ph); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
arXiv:
2407.01787 [pdf]
2 citations
08
[Submitted on 2 Jul 2024] (cross-list from hep-ph)
Reveal short range interactions between $u / d$ quarks in the $N N$ , $D_{03}$ , and $D_{30}$ systems
Qi-Fang Lü🇨🇳 · Yu-Bing Dong🇨🇳 · Peng-Nian Shen🇨🇳 · Zong-Ye Zhang🇨🇳
The dynamic mechanism of short range interactions between $u / d$ quarks remains an open and challenging problem. In order to reveal this quark dynamics, we perform a systematic analysis of $N N$ , $D_{03}$ , and $D_{30}$ systems in the (extended) chiral SU(3) constituent quark models. By comparing results calculated with different models and different parameter sets, the effects of one gluon exchange and vector meson exchange terms are carefully examined. The results indicate that the vector meson exchange interactions dominate the short range interactions between $u / d$ quarks, whereas the small residual one gluon exchange coupling strength is also allowed.
Comments:
10 pages, 2 figures. Some modifications, accepted version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2407.01993 [pdf]
SCPMA(2025)·7 citations
09
[Submitted on 2 Jul 2024] (cross-list from hep-ph)
Jet quenching for hadron-tagged jets in $p A$ collisions
B.G. Zakharov🇷🇺
We calculate the medium modification factor $I_{p A}$ for 5.02 TeV $p$ +Pb collisions. We use the Monte-Carlo Glauber model to determine the parameters of the quark-gluon plasma fireball in $p A$ jet events. Our calculations show that the jet quenching effect for $I_{p A}$ turns out to be rather small. We have found that the theoretical $I_{p A}$ as a function of the underlying event charged multiplicity density, within errors, agrees with data from ALICE for 5.02 TeV $p$ +Pb collisions. However, the experimental errors are too large to draw a firm conclusion on the possible presence of jet quenching.
Comments:
6 pages, 2 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2407.01997 [pdf]
Pisma Zh.Eksp.Teor.Fiz.(2024)·1 citation
10
[Submitted on 2 Jul 2024] (cross-list from physics.atom-ph)
The role of the effective range in strongly-interacting few-body systems
Lucas Madeira
Strongly interacting systems appear in several areas of physics and are characterized by attractive interactions that can almost, or just barely, loosely bind two particles. Although this definition is made at the two-body level, this gives rise to fascinating effects in larger systems, including the so-called Efimov physics. In this context, the zero-range theory aims to describe low-energy properties based only on the scattering length. However, for a broad range of physical applications, the finite range of the interactions plays an important role. In this work, I discuss some aspects of finite-range effects in strongly interacting systems. I present the zero-range and shapeless universalities in two-body systems with applications in atomic and nuclear physics. I derived an analytical expression for the $s$ -wave bound-state spectrum of the modified Pöschl-Teller potential for two particles in three dimensions, which is compared with the approximations to illustrate their usefulness. Concerning three identical bosons, I presented a trimer energy scaling function that explicitly includes the effective range. The implications for larger systems are briefly discussed.
Comments:
22 pages, 5 figures
Subjects:
Atomic Physics (physics.atom-ph); Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th); physics.atm-clus (physics.atm-clus)
arXiv:
2407.02135 [pdf]
Few Body Syst.(2024)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE