Nuclear Theory·nucl-th

Tuesday·July 30, 2024

16 papers—8 primary·8 cross-listed

01
[Submitted on 26 Jul 2024]
Causality and stability in relativistic hydrodynamic theory -- a choice to be endured
Sayantani Bhattacharyya · Sukanya Mitra · Shuvayu Roy
In this work, it has been indicated that the key features requisite for preserving causality and stability of the popularly existing relativistic hydrodynamic theories, can be translated into each other. It has been shown here, that a generic `fluid frame transformation' including all orders of gradient corrections can recast a stable-causal hydrodynamic theory that (i) only includes fundamental fluid variables (velocity and temperature) but requires to be in a general hydrodynamic frame other than the Landau or Eckart, to a theory that is (ii) pathology free in Landau frame but needs newer degrees of freedom. Since frame choice provides the first principle field definitions and degrees of freedom indicate the number of conserved quantities, the causality and stability of a theory seem to require a consensus between the two unless the derivative correction goes to infinity. The key finding of this work is to indicate a connection between these different formalisms, that lead to a causal and stable hydrodynamic theory.
Comments:
Version accepted in Physics Letters B; This paper is a companion paper of arXiv:2312.16407 [nucl-th] which is an elaborate version of this paper
Subjects:
Nuclear Theory (nucl-th); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
arXiv:
2407.18997 [pdf]
PLB(2024)·12 citations
02
[Submitted on 27 Jul 2024]
On the determination of the $D$ meson width in the nuclear medium with the transparency ratio
Victor Montesinos🇪🇸 · Natsumi Ikeno🇯🇵 · Eulogio Oset🇪🇸 · Miguel Albaladejo🇪🇸 · Juan Nieves🇪🇸 · Laura Tolos🇪🇸
We have studied the feasibility of the experimental determination of the width of a $D$ meson in a nuclear medium by using the method of the nuclear transparency. The cross section for inclusive production of a $D^{+}$ in different nuclei is evaluated, taking care of the $D^{+}$ absorption in the nucleus, or equivalently, the survival probability of the $D^{+}$ in its way out of the nucleus from the point of production. We use present values of the in medium width of $D$ mesons and calculate ratios of the cross sections for different nuclei to the $^{12} C$ nucleus as reference. We find ratios of the order of $0.6$ for heavy nuclei, a large deviation from unity, which indicates that the method proposed is adequate to measure this relevant magnitude, so far only known theoretically.
Comments:
9 pages, 4 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2407.19295 [pdf]
PLB(2025)·5 citations
03
[Submitted on 29 Jul 2024]
Correlation between alpha-decay half-lives and symmetry energy
Yong-Beom Choi · Hana Gil · Chang Ho Hyun · Chang-Hwan Lee
We study the alpha-decay half-lives of 84 <= Z <= 92 even-even nuclei in the semiclassical WKB approximation framework using the density-dependent cluster model and the density distribution described by various Korea-IBS-Daegu-SKKU (KIDS) models. Main goal of this work is to find a correlation between the alpha-decay half-lives and the stiffness of the symmtery energy. Parameters of KIDS model are determined to reproduce the nuclear data (energy and charge radii of 40Ca, 48Ca and 208Pb) and the neutron star observations including constraints by NICER, tidal deformability from GW170817, and the maximum mass limit of neutron star observations. We use the KIDS models (A-D) which have distinctive values for the parameters controlling the stiffness of the nuclear matter equation of state. We find that the alpha-decay half-lives increase systematically from KIDS-A model to KIDS-D model. This implies a correlation between the alpha-decay half-lives and the symmetry energy. We find that the correlation can be understood from the dependence of the particle distribution in the core and the surface region on the symmetry energy.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2407.19647 [pdf]
PRC(2025)·4 citations
04
[Submitted on 29 Jul 2024]
Neutrinoless double-beta decay in a finite volume from relativistic effective field theory
Y. L. Yang🇨🇳 · P. W. Zhao🇨🇳
The neutrinoless double-beta decay process $nn \to pp ee$ within the light Majorana-exchange scenario is studied using the relativistic pionless effective field theory (EFT) in finite-volume cubic boxes with the periodic boundary conditions. Using the low-energy two-nucleon scattering observables from lattice QCD available at $m_{π} = 300$ , 450, 510, and 806 MeV, the leading-order $nn \to pp ee$ transition matrix elements are predicted and their volume dependence is investigated. The predictions for the $nn \to pp ee$ transition matrix elements can be directly compared to the lattice QCD calculations of the $nn \to pp ee$ process at the same pion masses. In particular for the matrix element at $m_{π} = 806$ MeV, the predictions with relativistic pionless EFT are confronted to the recent first lattice QCD evaluation. Therefore, the present results are expected to play a crucial role in the benchmark between the nuclear EFTs and the upcoming lattice QCD calculations of the $nn \to pp ee$ process, which would provide a nontrivial test on the predictive power of nuclear EFTs on neutrinoless double-beta decay.
Comments:
35 pages, 7 figures
Subjects:
High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2407.19695 [pdf]
PRD(2025)·5 citations
05
[Submitted on 29 Jul 2024]
Meson-nucleus bound states in quark meson coupling model
Arpita Mondal🇮🇳 · Amruta Mishra🇮🇳
The formations of the $K (K ˉ)$ , $D (D ˉ)$ , and $B (B ˉ)$ meson-nucleus bound states in $^{16} O$ , $^{40} Ca$ , $^{90} Zr$ , $^{197} Au$ , and $^{208} Pb$ nucleus are investigated using the quark meson coupling model. The model relies on a mean field description of non-overlapping nucleon bags bound by the self-consistent interactions of scalar ( $σ$ , $δ$ ) and vector ( $ω$ , $ρ$ ) mesons with the (anti)quarks inside the bags, which is further extended to explore the properties of nuclei. We estimate the meson-nucleus bound state energies by solving the Klein-Gordon equations with the real potentials calculated self-consistently within the model, using a coordinate space approach. The calculations are carried out for different nuclear interactions. The effects of Coulomb interaction are considered in the present study for the charged mesons. Our study indicates the formation of rather deeply bound $B$ -mesic states at the very central region of the nuclei, compared to the $D$ and $K$ mesons, offering a more promising probe to explore subtle nuclear medium effects. The investigations of such bound states are of particular interest for the upcoming $P ˉ ANDA$ at FAIR, J-PARC-E29, and JLab experiments.
Comments:
Expressions of mesic-nuclei potentials corrected, figures 4,5,6, tables III and V and discussions of results revised. Erratum submitted to Phys. Rev. C
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2407.19896 [pdf]
PRC(2024)·10 citations
06
[Submitted on 29 Jul 2024]
Investigation of kaonic atom optical potential by the high precision data of kaonic $^{3}$ He and $^{4}$ He atoms
J. Yamagata-Sekihara (Kyoto Sangyo U.)🇯🇵 · Y. Iizawa (Tokyo Inst. Tech.)🇯🇵 · D. Jido (Tokyo Inst. Tech.)🇯🇵 · N. Ikeno (Tottori U.)🇯🇵 · T. Hashimoto (Nishina Car., RIKEN and RIKEN)🇯🇵 · S. Okada (Chubu U. and RIKEN)🇯🇵 · S. Hirenzaki (Nara Women's U.)🇯🇵
We theoretically investigate kaonic atom states based on the latest high precision data of the $2 p$ states of the kaonic atoms in $^{3}$ He and $^{4}$ He (J-PARC E62). We consider the phenomenological form for the optical potential proportional to the nuclear density distributions and determine the potential parameters by the latest data. We find two sets of potential parameters for each of $K^{-} -^{3}$ He and $K^{-} -^{4}$ He that reproduce the data. We then extract the potential parameters consistent with the data of $^{3}$ He and $^{4}$ He atoms simultaneously. Using the potential, we investigate the structure of the kaonic atoms and kaonic nuclei for various nuclei up to Sn. We also report the optical potential parameters suited for the global description of the atomic data, the possible strong isospin dependence of the potential, and the different strength of the data of $K^{-} -^{3}$ He and $K^{-} -^{4}$ He in the restrictions on the potential parameters. In addition, we find that the study of the $1 s$ states of the kaonic helium atom is very interesting as a next step, and the determination of the orbital angular momenta of the kaonic nuclear states is helpful for the unified understandings of the atomic and nuclear bound states of kaon because of the mutual influence between the atomic and the nuclear states of kaon with the same orbital angular momentum.
Comments:
22 pages, 14 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2407.20012 [pdf]
PTEP(2025)·5 citations
07
[Submitted on 29 Jul 2024]
Systematic study of complete fusion suppression for 6,7 Li nuclei using artificial neural network
D. Chattopadhyay
In recent decades, there has been a significant increase in the measurement of complete fusion cross-sections for various reactions, with particular emphasis on the reactions involving weakly bound projectile. It has been well established that the complete fusion cross-section involving weakly bound nuclei is suppressed at above barrier energies due to the breakup effect. Accurate determination of suppression factor is essential to understand the effect of breakup on complete fusion suppression. In this study, Feedforward Artificial Neural Network (ANN) methods based on Multilayer Perceptron is utilized to estimate the complete fusion suppression factor for reactions involving 6,7 Li projectile from the comparison of ANN predicted reduced fusion functions (F (x)) with the Universal Fusion Function(F0 (x)). Average suppression factor has been estimated as 0.68 and 0.74 for 6 Li and 7 Li induced reactions respectively. Normalized Mean Squared Error(NMSE) has been calculated as 1.85% for training and 1.92% for testing data of ANN for 6 Li case, while for 7 Li cases, the same is for 3.73% and 6.48% respectively. Present results have been compared with three other alternative methods Support Vector Regression, Random Forest Regression and Gaussian Process Regression. Relevant performance matrices has been estimated. It has been observed that, ANN algorithm is giving the better accuracy as compared with other. This results indicate that ANN might be an alternative tool for estimation of complete fusion suppression factor for weakly bound projectile.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2407.20049 [pdf]
0 citations
08
[Submitted on 29 Jul 2024]
Universal corrections to the superfluid gap in a cold Fermi gas
Silas R. Beane🇨🇭 · Zeno Capatti🇨🇭 · Roland C. Farrell🇨🇭
A framework for computing the superfluid gap in an effective field theory (EFT) of fermions interacting via momentum-independent contact forces is developed. The leading universal corrections in the EFT are one-loop in-medium effects at the Fermi surface, and reproduce the well-known Gor'kov-Melik-Barkhudarov result. The complete subleading universal corrections are presented here, and include one-loop effects away from the Fermi surface, two-loop in-medium effects, as well as modifications to the fermion propagator. Together, these effects are found to reduce the gap at low densities. Applications to neutron superfluidity in neutron stars are also discussed.
Comments:
11 pages + appendices. 10 figures
Subjects:
Nuclear Theory (nucl-th); Quantum Gases (cond-mat.quant-gas); Superconductivity (cond-mat.supr-con); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2407.20168 [pdf]
PRA(2025)·5 citations
09
[Submitted on 27 Jul 2024] (cross-list from hep-ph)
Cold nuclear matter effects on azimuthal decorrelation in heavy-ion collisions
Néstor Armesto🇪🇸 · Florian Cougoulic🇪🇸 · Bin Wu🇪🇸
The assumption of factorization lies at the core of calculations of medium effects on observables computable in perturbative Quantum Chromodynamics. In this work we examine this assumption, for which we propose a setup to study hard processes and bulk nuclear matter in heavy-ion collisions on the same footing using the Glauber modelling of heavy nuclei. To exemplify this approach, we calculate the leading-order corrections to azimuthal decorrelation in Drell-Yan and boson-jet processes due to cold nuclear matter effects, not considering radiation. At leading order in both the hard momentum scale and the nuclear size, the impact-parameter dependent cross section is found to factorize for both processes. The factorization formula involves a convolution of the hard cross section with the medium-modified parton distributions, and, for boson-jet production, the medium-modified jet function.
Comments:
37pages, 6figures, V2 submission to JHEP
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2407.19243 [pdf]
JHEP(2024)·2 citations
10
[Submitted on 27 Jul 2024] (cross-list from nucl-ex)
Magicity versus superfluidity around $^{28}$ O viewed from the study of $^{30}$ F
J. Kahlbow🇰🇷 · T. Aumann🇰🇷 · O. Sorlin🇫🇷 · Y. Kondo🇯🇵 · T. Nakamura🇯🇵 · F. Nowacki🇫🇷 · A. Revel🇫🇷 · N. L. Achouri🇫🇷 · H. Al Falou🇱🇧 · L. Atar🇰🇷 · H. Baba🇯🇵 · K. Boretzky🇩🇪 and 75 other authors
The neutron-rich unbound fluorine isotope $^{30}$ F $_{21}$ has been observed for the first time by measuring its neutron decay at the SAMURAI spectrometer (RIBF, RIKEN) in the quasi-free proton knockout reaction of $^{31}$ Ne nuclei at 235 MeV/nucleon. The mass and thus one-neutron-separation energy of $^{30}$ F has been determined to be $S_{n} = - 472 \pm 58 (stat.) \pm 33 (sys.)$ keV from the measurement of its invariant-mass spectrum. The absence of a sharp drop in $S_{n}$ ( $^{30}$ F) shows that the ``magic'' $N = 20$ shell gap is not restored close to $^{28}$ O, which is in agreement with our shell-model calculations that predict a near degeneracy between the neutron $d$ and $f p$ orbitals, with the $1 p_{3/2}$ and $1 p_{1/2}$ orbitals becoming more bound than the $0 f_{7/2}$ one. This degeneracy and reordering of orbitals has two potential consequences: $^{28}$ O behaves like a strongly superfluid nucleus with neutron pairs scattering across shells, and both $^{29, 31}$ F appear to be good two-neutron halo-nucleus candidates.
Comments:
9 pages, 2 figures, accepted for publication in Physical Review Letters
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2407.19303 [pdf]
PRL(2024)·11 citations
11
[Submitted on 28 Jul 2024] (cross-list from hep-ph)
Revisiting gauge invariance and Reggeization of pion exchange
Gloria Montana🇺🇸 · Daniel Winney🇩🇪 · Lukasz Bibrzycki🇵🇱 · Cesar Fernandez-Ramirez🇪🇸 · Giorgio Foti🇮🇹 · Nadine Hammoud🇪🇸 · Vincent Mathieu🇪🇸 · Robert J. Perry🇪🇸 · Alessandro Pilloni🇮🇹 · Arkaitz Rodas🇺🇸 · Vanamali Shastry🇺🇸 · Wyatt A. Smith🇺🇸 · Adam P. Szczepaniak🇺🇸
The Reggeized pion is expected to provide the main contribution to the forward cross section in light meson photoproduction reactions with charge exchange at high energies. We discuss the Reggeization of pion exchange in charged pion photoproduction with an emphasis on consistency with current conservation. We show that the gauge-invariant amplitude for the exchange of a particle with generic even spin $J \geq 2$ in the $t$ -channel is analytic at $J = 0$ , and that it can be interpreted in terms of the nucleon electric current. This enables us to reconcile the dynamics in the $s$ - and $u$ -channel, which involves also nucleon exchanges, with the amplitude expressed in terms of $t$ -channel partial waves, as required by Regge theory.
Comments:
16 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2407.19577 [pdf]
PRD(2024)·9 citations
12
[Submitted on 29 Jul 2024] (cross-list from hep-th)
Formulating Schwinger--Dyson equations for QED propagators in Minkowski space
Shaoyang Jia🇺🇸
The Schwinger--Dyson equations (SDEs) are coupled integral equations for the Green's functions of a quantum field theory (QFT). The SDE approach is the analytic nonperturbative method for solving strongly coupled QFTs. When applied to QCD, this approach, also based on the first principle, is the analytic alternative to lattice QCD. However, the SDEs for the n-point Green's functions involves (n+1)-point Green's functions (sometimes (n+2)-point functions as well). Therefore any practical method for solving this infinitely coupled system of equations requires a truncation scheme. When considering strongly coupled QED as a modeling of QCD, naive truncation schemes violate various principles of the gauge theory. These principles include gauge invariance, gauge covariance, and multiplicative renormalizability. The combination of dimensional regularization with the spectral representation of propagators results in a tractable formulation of a truncation scheme for the SDEs of QED propagators, which has the potential to preserve the aforementioned principles and renders solutions obtainable in the Minkowski space.
Comments:
Ph.D. thesis College of William and Mary
Subjects:
High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2407.19626 [pdf]
1 citation
13
[Submitted on 29 Jul 2024] (cross-list from nucl-ex)
Study of one-step and two-step neutron transfer in the reaction $^{6}$ Li + $^{9}$ Be
Azhibekov Aidos · Lukyanov Sergey · Penionzhkevich Yuri · Urazbekov Bakytzhan · Naumenko Mikhail · Samarin Vyacheslav · Issatayev Talgat · Maslov Vladimir · Mendibayev Kayrat · Aznabayev Dauren · Temirzhanov Alisher
The paper presents the results of experiments on measuring the cross sections for elastic scattering and nucleon transfer channels in the $^{6}$ Li + $^{9}$ Be reaction at an incident energy of 68 MeV: $^{9}$ Be( $^{6}$ Li, $^{6}$ Li) $^{9}$ Be, $^{9}$ Be( $^{6}$ Li, $^{7}$ Li) $^{8}$ Be, $^{9}$ Be( $^{6}$ Li, $^{7}$ Li) $^{8}$ Be $_{2 +}$ , $^{9}$ Be( $^{6}$ Li, $^{8}$ Li) $^{7}$ Be, $^{9}$ Be( $^{6}$ Li, $^{7}$ Be) $^{8}$ Li. The aim is to reveal the manifestation of the cluster structure of $^{9}$ Be. Theoretical analysis of the contributions of one-step and two-step neutron transfer mechanisms is performed using the distorted wave Born approximation method with the Fresco code. Good agreement between the calculations and the experimental data was obtained for the channels of elastic scattering $^{9}$ Be( $^{6}$ Li, $^{6}$ Li) $^{9}$ Be, neutron $^{9}$ Be( $^{6}$ Li, $^{7}$ Li) $^{8}$ Be and proton transfer $^{9}$ Be( $^{6}$ Li, $^{7}$ Be) $^{8}$ Li, as well as the transfer of two neutrons $^{9}$ Be( $^{6}$ Li, $^{8}$ Li) $^{7}$ Be. It is shown that the dineutron cluster transfer mechanism makes a dominant contribution to the $^{9}$ Be( $^{6}$ Li, $^{8}$ Li) $^{7}$ Be reaction channel at forward angles.
Comments:
15 pages, 17 figures, 5 tables. To be published in Chinese Physics C
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2407.19846 [pdf]
CPC(2024)·3 citations
14
[Submitted on 29 Jul 2024] (cross-list from hep-ph)
QCD jets in a hot and dense medium: a study of shower formation time and collision kernels
Rouzbeh Modarresi-Yazdi🇨🇦 · Shuzhe Shi🇨🇳 · Charles Gale🇨🇦 · Sangyong Jeon🇨🇦
With the use of MARTINI, a model which considers evolving QCD jets against a fluid dynamical background, it is shown that the introduction of formation time to the parton shower after the initial hard scattering is essential for a simultaneous description of charged hadron and jet $R_{AA}$ . This inclusion also improves jet shape ratio at small angle and jet fragmentation function ratios of leading charged hadrons. The MARTINI framework is then aimed at a study of the leading order, next-to-leading-order, and non perturbative collision kernels. Sizable differences in the modification of jet substructure observables, i.e., jet shape and fragmentation functions are observed. Such differences are caused by the difference in the radiation rates of relatively soft gluons that survive in the evolution in medium.
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2407.19966 [pdf]
PRC(2025)·14 citations
15
[Submitted on 29 Jul 2024] (cross-list from hep-ph)
Likely existence of bound states and the Efimov effect in the triple- $J / ψ$ system
Ya-Wen Pan🇨🇳 · Zhi-Wei Liu🇨🇳 · Li-Sheng Geng🇨🇳 · Atsushi Hosaka🇯🇵 · Xiang Liu🇨🇳
The ground-breaking discovery of the first fully charmed tetraquark state $X (6900)$ in the $J / ψ J / ψ$ invariant mass distribution by the LHCb collaboration has inspired intensive theoretical studies. Various interpretations, such as molecular states, compact tetraquark states, and coupled-channel effects, have been proposed for these states. Of particular interest is the ongoing search for the triple- $J / ψ$ state--a fully-charmed hexaquark state. To deepen our understanding of the triple- $J / ψ$ state and to guide future experimental searches, we study the triple- $J / ψ$ system in this work employing the Gaussian expansion method and the $J / ψ J / ψ$ potential parameterized to yield a shallow bound state, as suggested in several theoretical works. Our results support a triple- $J / ψ$ bound state, even in cases where the attractive interaction between the two $J / ψ$ mesons is very weak. Moreover, our analysis implies the Efimov effect in the triple- $J / ψ$ system. In addition, we extend our investigation to the triple- $Υ (1 S)$ system and obtain results similar to those for the triple- $J / ψ$ system.
Comments:
8 pages, 3 figures, 4 tables; comments welcome
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2407.20017 [pdf]
PRD(2024)·3 citations
16
[Submitted on 29 Jul 2024] (cross-list from hep-th)
On the EFT of Dyon-Monopole Catalysis
S. Bogojevic🇨🇦 · C.P. Burgess🇨🇦
Monopole-fermion (and dyon-fermion) interactions provide a famous example where scattering from a compact object gives a cross section much larger than the object's geometrical size. This underlies the phenomenon of monopole catalysis of baryon-number violation because the reaction rate is much larger in the presence of a monopole than in its absence. It is sometimes claimed to violate the otherwise generic requirement that short distance physics decouples from long-distance observables -- a property that underpins the general utility of effective field theory (EFT) methods. Decoupling in this context is most simply expressed using point-particle effective field theories (PPEFTs) designed to capture systematically how small but massive objects influence their surroundings when probed only on length scales large compared to their size. These have been tested in precision calculations of how nuclear properties affect atomic energy levels for both ordinary and pionic atoms. We adapt the PPEFT formalism to describe low-energy $S$ -wave dyon-fermion scattering with a view to understanding whether large catalysis cross sections violate decoupling (and show why they do not). We also explore the related but separate issue of the long-distance complications associated with polarizing the fermion vacuum exterior to a dyon and show in some circumstances how PPEFT methods can simplify calculations of low-energy fermion-dyon scattering in their presence. We propose an effective Hamiltonian governing how dyon excitations respond to fermion scattering in terms of a time-dependent vacuum angle and outline open questions remaining in its microscopic derivation.
Comments:
48 pages plus appendices
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2407.20146 [pdf]
JHEP(2024)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE