PaperPanorama

Nuclear Theory·nucl-th

Thursday·July 13, 2023

19 papers7 primary·12 cross-listed

  1. 01

    [Submitted on 10 Jul 2023]

    Comment on "Nuclear Excitation by Free Muon Capture"

    Natalia S. Oreshkina · Julian C. Berengut

    In the paper [1] the process of free muon capture with simultaneous excitation of a nuclear isomer has been suggested, claiming that ``the effect can be detectable for selected isotopes". Here, we argue that this claim can not be confirmed. Briefly, the process is far from the dominant mechanism for nuclear excitation; it excites high energy nuclear levels that will not generally decay to the isomer; the proposal assumes all incident muons will fulfil energy criteria, ignoring dominant capture paths; and nuclei excited by muons will have a shortened lifetime due to muonic capture.

    Subjects:
    Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    2307.05577 [pdf]
    PRL(2024)·1 citation
  2. 02

    [Submitted on 11 Jul 2023]

    Thermal phonon fluctuations and stability of the magnetic dual chiral density wave phase in dense QCD

    E. J Ferrer🇺🇸 · W. Gyory🇺🇸 · V. de la Incera🇺🇸

    We study the stability against thermal phonon fluctuations of the magnetic dual chiral density wave (MDCDW) phase, an inhomogeneous phase arising in cold dense QCD in a magnetic field. Following a recent study that demonstrated the absence of the Landau-Peierls (LP) instability from this phase, we calculate the (threshold) temperature at which the phonon fluctuations wash out the long-range order over a range of magnetic fields and densities relevant to astrophysical applications. Using a high-order Ginzburg-Landau expansion, we find that the threshold temperature is very near the critical temperature for fields of order G, and still a sizable fraction of the critical temperature for fields of order G. Therefore, at sufficiently large magnetic fields, the long-range order of the MDCDW phase is preserved over most of the parameter space where it is energetically favored; at smaller magnetic fields, the long-range order is still preserved over a considerable region of parameter space relevant to compact stars. We provide general symmetry arguments to explain why a magnetic field alone is not enough to eliminate the LP instability that characterizes single-modulated phases in 3+1 dimensions.

    Comments:
    A new discussion was added on the roles of magnetic fields and condensate symmetry-breaking in eliminating the LP instability
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2307.05621 [pdf]
    PRD(2024)·8 citations
  3. 03

    [Submitted on 11 Jul 2023]

    Impact of the Li asymptotic normalization constant onto -induced reactions of astrophysical interest

    Chloë Hebborn · Melina L. Avila · Konstantinos Kravvaris · Gregory Potel · Sofia Quaglioni

    Indirect methods have become the predominant approach in experimental nuclear astrophysics for studying several low-energy nuclear reactions occurring in stars, as direct measurements of many of these relevant reactions are rendered infeasible due to their low reaction probability. Such indirect methods, however, require theoretical input that in turn can have significant poorly-quantified uncertainties, which can then be propagated to the reaction rates and have a large effect on our quantitative understanding of stellar evolution and nucleosynthesis processes. We present two such examples involving -induced reactions, C(O and CO, for which the low-energy cross sections have been constrained with Li transfer data. In this Letter, we discuss how a first-principle calculation of Li leads to a 21% reduction of the CO cross sections with respect to a previous estimation. This calculation further resolves the discrepancy between recent measurements of the CO reaction and points to the need for improved theoretical formulations of nuclear reactions.

    Comments:
    7 pages (including references) and 3 figures
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Experiment (nucl-ex)
    arXiv:
    2307.05636 [pdf]
    PRC(2024)·12 citations
  4. 04

    [Submitted on 11 Jul 2023]

    Simultaneous study of scattering and fusion hindrance near Coulomb barrier in systems

    Kamala Kanta Jena · Bidhubhusan Sahu · Jajati K. Nayak · Raj Preethi P · B. K. Sharma · Santosh Kumar Agarwalla

    A phenomenological optical potential is used to study the elastic angular distributions for the system close to the Coulomb barrier. This potential is constructed by taking into account the flexible potential developed by Ginocchio. The fluctuations in the real and imaginary parts of the optical model potential follow the trends of the threshold anomaly. The set of optical potential parameters needed to analyze the fusion cross sections of the same system are obtained through analysis of the scattering cross sections. Theoretical fusion cross-sections and results from four different experimental groups well agree for a range of energies. Several Fluorine (F) isotopes are used as projectiles in this study of fusion cross-sections by slightly altering the radial parameter. It was found that the fusion process occurs unfettered in the system below the Coulomb barrier but is seriously hindered in the case of its isotopic projectiles.

    Comments:
    14 pages, 9 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2307.05652 [pdf]
    Acta Phys.Polon.B(2023)·5 citations
  5. 05

    [Submitted on 11 Jul 2023]

    Empirical radius formulas for canonical neutron stars from bidirectionally selecting EOS features in extended Bayesian analyses of observational data

    Jake Richter · Bao-An Li

    Given the significant advancement in Bayesian inference of nuclear Equation of State (EOS) from gravitational wave and X-ray observations of neutron stars (NSs), especially since GW170817, is there a data-driven and robust empirical formula for the radius of canonical NSs in terms of the characteristic EOS parameters (features)? What is the single most important but currently poorly known EOS parameter for determining the ? We study these questions by extending the traditional Bayesian analysis which normally ends at presenting the marginalized posterior probability distribution functions (PDFs) of individual EOS parameters and their correlations (or sometimes only the Pearson correlation coefficients which are only reliably useful when the variables are linearly correlated while they are actually often not). Using three regression model-building methodologies: bidirectional step-wise feature selection, Least Absolute Shrinkage Selection Operator (LASSO) regression, and neural network regression on a large set of posterior EOSs and the corresponding values inferred from earlier comprehensive Bayesian analyses of NS observational data, we systematically and rigorously develop the most probable formulas with varying statistical accuracy and technical complexity. The most important EOS parameters for determining are found consistently in each of the feature/model selection processes to be (in order of decreasing importance): curvature , slope , skewness of nuclear symmetry energy, skewness , incompressibility of symmetric nuclear matter, and the magnitude of symmetry energy at the saturation density of nuclear matter.

    Comments:
    Phys. Rev. C (2023) in press
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex)
    arXiv:
    2307.05848 [pdf]
    PRC(2023)·20 citations
  6. 06

    [Submitted on 12 Jul 2023]

    Short-range expansion for the quantum many-body problem

    Ronen Weiss · Diego Lonardoni · Stefano Gandolfi

    In this work we derive a systematic short-range expansion of the many-body wave function. At leading order, the wave function is factorized to a zero-energy -wave correlated pair and spectator particles, while terms that include energy derivatives and larger orbital angular momentum two-body functions appear at subleading orders. The validity of the expansion is tested for the two-body case, as well as the many-body case, where infinite neutron matter is considered. An accurate and consistent description of both coordinate-space two-body densities and the one-body momentum distribution is obtained. These results show the possibility to utilize such an expansion for describing different observables in strongly-interacting many-body systems, including nuclear, atomic and condensed-matter systems. This work also enables a systematic description of large momentum transfer reactions in nuclear systems sensitive to short-range correlations, provides a link between such experiments and low-energy nuclear physics, and motivates measurement of new observables in these experiments.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2307.05910 [pdf]
    PLB(2024)·1 citation
  7. 07

    [Submitted on 12 Jul 2023]

    Relativistic second-order viscous hydrodynamics from kinetic theory with extended relaxation-time approximation

    Dipika Dash🇮🇳 · Sunil Jaiswal🇮🇳 · Samapan Bhadury🇵🇱 · Amaresh Jaiswal🇮🇳

    We use the extended relaxation time approximation for the collision kernel, which incorporates a particle-energy dependent relaxation time, to derive second-order viscous hydrodynamics from the Boltzmann equation for a system of massless particles. The resulting transport coefficients are found to be sensitive to the energy dependence of the relaxation time and have significant influence on the fluid's evolution. Using the derived hydrodynamic equations, we study the evolution of a fluid undergoing (0+1)-dimensional expansion with Bjorken symmetry and investigate the fixed point structure inherent in the equations. Further, by employing a power law parametrization to describe the energy dependence of the relaxation time, we successfully reproduce the stable free-streaming fixed point for a specific power of the energy dependence. The impact of the energy-dependent relaxation time on the processes of isotropization and thermalization of an expanding plasma is discussed.

    Comments:
    14 pages, 4 figure. Matches published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2307.06195 [pdf]
    PRC(2023)·14 citations
  8. 08

    [Submitted on 7 Jul 2023] (cross-list from hep-ph)

    Spectroscopy and femtoscopic correlation function of the , system in quark delocalization color screening model

    Xuejie Liu · Dianyong Chen · Hongxia Huang · Jialun Ping

    In this work, we systematically investigate the pentaquark systems with quark contents with the analyzed total spin and parity quantum numbers of , and , in the I=0, I=1 and I=2 isospin channels. The effective potentials between baryon and meson clusters are given, and the possible bound states are also investigated. Also, the study of the scattering process of the open channels is performed to identify possible resonance states. Our estimations indicate that several possible bound states and narrow baryon-meson resonances are found from corresponding the calculation processes. Furthermore, to bridge the gap between theoretical predictions and experimental measurement, we also extract the low-energy scattering parameters and compute the femtoscopic correlation functions for the system using the CATS framework. The results demonstrate that the predicted bound state manifests as a significant enhancement at low momentum accompanied by a characteristic suppression. In contrast, the correlations remain relatively flat as the predicted resonances are kinematically distant from the threshold. The sector exhibits strong spin dependence, where the bound state signal in the channel is largely masked by repulsive components in spin-averaged observables. This cancellation effect suggests that future experimental searches at ALICE and LHCb may require spin-selective measurements to identify such states. These predictions provide crucial theoretical guidance for future experiments.

    Comments:
    arXiv admin note: text overlap with arXiv:2211.09433
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2307.05516 [pdf]
    2 citations
  9. 09

    [Submitted on 10 Jul 2023] (cross-list from hep-lat)

    Quantum Simulation of Lattice QCD with Improved Hamiltonians

    Anthony N. Ciavarella🇺🇸

    Quantum simulations of lattice gauge theories are anticipated to directly probe the real time dynamics of QCD, but scale unfavorably with the required truncation of the gauge fields. Improved Hamiltonians are derived to correct for the effects of gauge field truncations on the SU(3) Kogut-Susskind Hamiltonian. It is shown in that this enables low chromo-electric field truncations to quantitatively reproduce features of the untruncated theory over a range of couplings and quark masses. In , an improved Hamiltonian is derived for lattice QCD with staggered massless fermions. It is shown in the strong coupling limit that the spectrum qualitatively reproduces aspects of two flavor QCD and simulations of a small system are performed on IBM's {\tt Perth} quantum processor.

    Subjects:
    High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2307.05593 [pdf]
    PRD(2023)·82 citations
  10. 10

    [Submitted on 11 Jul 2023] (cross-list from hep-ph)

    Practical Dirac Majorana confusion theorem: Issues and Applicability

    C. S. Kim🇰🇷

    We inspect the model-independent study of practical Dirac Majorana confusion theorem (pDMCT) -- a wide spread belief that the difference between Dirac and Majorana neutrinos via any kinematical observable would be practically impossible to determine because of the difference only being proportional to the square of neutrino mass -- in context of processes that have at least a neutrino antineutrino pair in their final state. We scrutinize the domain of applicability of pDMCT and also highlight those aspects that are often misunderstood. We try to clarify some of the frequently used concepts that are used to assert pDMCT as a generic feature irrespective of the process, or observable, such as the existence of any analytic continuity between Dirac and Majorana neutrinos in the limit mass(neutrino) -> 0. In summary, we illustrate that pDMCT is not any fundamental property of neutrinos, instead, it is a phenomenological feature of neutrino non-observation, depending on models and processes.

    Comments:
    A few note added in blue color, after published in European Physics Journal C (2023) 83:972
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2307.05654 [pdf]
    EPJC(2023)·8 citations
  11. 11

    [Submitted on 9 Jul 2023] (cross-list from hep-ph)

    Exponential Resummation of QCD at finite chemical potential

    Sabarnya Mitra🇮🇳

    A comprehensive study of the QCD phase diagram is one of the challenging and open problems in high energy physics. Having significant astrophysical implications, this is also important in constructing the chronological evolution of the universe. With this aim, this thesis describes the behaviour of thermodynamic observables like pressure and number density with changing chemical potential , through the method of an unbiased exponential resummation of lower order Taylor series of these observables at a finite . We address the problem of biased estimates, which manifest uncontrollably in exponential resummation and which become severe in the domain of large values, higher orders of and also in observables which are higher derivatives of the thermodynamic potential. We show that our new formalism of unbiased exponential resummation can eliminate these biased estimates exactly upto a given order of , and can capture important contributions of higher order Taylor series for all our working temperatures starting from hadronic phase to the plasma phase, including the crossover region. We also demonstrate that this new formalism is highly efficient in saving appreciable computational time and storage space for computations.

    Comments:
    173 pages excluding contents and others, 40 figures, 7 tables, contribution as a PhD thesis
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2307.05751 [pdf]
    2 citations
  12. 12

    [Submitted on 11 Jul 2023] (cross-list from hep-lat)

    QCD on Rotating Lattice with Staggered Fermions

    Ji-Chong Yang🇨🇳 · Xu-Guang Huang🇨🇳

    We investigate the finite-temperature quantum chromodynamics (QCD) on a rotating lattice with staggered fermions and the projective plane boundary condition. We observe a negative rotational rigidity (defined in the main text) and a negative quark spin susceptibility associated with the chiral vortical effect. In contrast to most of the effective model predictions, we find that the chiral condensate decreases and the Polyakov loop increases with imaginary rotation, implying a rotational catalysis of chiral symmetry breaking and confinement by real rotation. We determine the phase boundaries for both chiral and confinement-deconfinement phase transitions on the - plane, where is the imaginary angular velocity.

    Comments:
    17 pages, 7 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2307.05755 [pdf]
    49 citations
  13. 13

    [Submitted on 12 Jul 2023] (cross-list from hep-ph)

    Chemical freeze-out parametrization with mean field repulsive hadron resonance gas model

    Sunny Kumar Singh🇮🇳 · Nachiketa Sarkar🇮🇳 · Deeptak Biswas🇮🇳

    We have examined the chemical freeze-out surface of the heavy-ion collision experiments within an interacting hadron resonance gas model. By considering repulsive interaction among hadrons in the mean-field level, we have suitably parameterized the freeze-out surface by fitting the yield data of mid-rapidity for the most central collision, for the collision energy available in AGS, RHIC (BES), and LHC programs. To suitably account for the repulsive interaction among mesons and (anti-) baryons, we have introduced phenomenological parameters and in the freeze-out parametrization. Although a finite value of these two parameters seem to be necessary to have an improved normalized \emph{chi-square}, the effect on the rest of the parameters like temperature and relevant chemical potentials seem to be within the standard variance.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2307.05930 [pdf]
    0 citations
  14. 14

    [Submitted on 12 Jul 2023] (cross-list from hep-th)

    Dispersion relations alone cannot guarantee causality

    Lorenzo Gavassino🇺🇸 · Marcelo M. Disconzi🇺🇸 · Jorge Noronha🇺🇸

    We show that linear superpositions of plane waves involving a single-valued, covariantly stable dispersion relation always propagate outside the lightcone, unless . This implies that there is no notion of causality for individual dispersion relations, since no mathematical condition on the function (such as the front velocity or the asymptotic group velocity conditions) can serve as a sufficient condition for subluminal propagation in dispersive media. Instead, causality can only emerge from a careful cancellation that occurs when one superimposes all the excitation branches of a physical model. This is shown to happen automatically in local theories of matter that are covariantly stable. Hence, we find that the need for nonhydrodynamic modes in relativistic fluid mechanics is analogous to the need for antiparticles in relativistic quantum mechanics.

    Comments:
    6 pages (Main Text) + 2 pages (Supplementary Material), published on Physical Review Letters, see https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.132.162301
    Subjects:
    High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Mathematical Physics (math-ph); math.MP (math.MP); Nuclear Theory (nucl-th)
    arXiv:
    2307.05987 [pdf]
    PRL(2024)·45 citations
  15. 15

    [Submitted on 12 Jul 2023] (cross-list from nucl-ex)

    Searching for universality of dineutron correlation at the surface of Borromean nuclei

    A.Corsi🇫🇷 · Y.Kubota🇯🇵 · J. Casal🇪🇸 · M.Gomez-Ramos🇪🇸 · A. M. Moro🇪🇸 · G. Authelet🇫🇷 · H. Baba🇯🇵 · C. Caesar🇩🇪 · D. Calvet🇫🇷 · A. Delbart🇫🇷 · M. Dozono🇯🇵 · J. Feng🇨🇳 and 56 other authors

    The dineutron correlation is systematically studied in three different Borromean nuclei near the neutron dripline, 11Li, 14Be and 17B, via the (p, pn) knockout reaction measured at the RIBF facility in RIKEN. For the three nuclei, the correlation angle between the valence neutrons is found to be largest in the same range of intrinsic momenta, which can be associated to the nuclear surface. This result reinforces the prediction that the formation of the dineutron is universal in environments with low neutron density, such as the surface of neutron-rich Borromean nuclei.

    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2307.06083 [pdf]
    PLB(2023)·14 citations
  16. 16

    [Submitted on 12 Jul 2023] (cross-list from hep-ph)

    A comparative study of different approaches for heavy quark energy loss, based on the latest experimental data

    Marjan Rahimi Nezhad🇮🇷 · Fatemeh Taghavi Shahri🇮🇷 · Sharareh Mehrabi Pari🇮🇷 · Kurosh Javidan🇮🇷

    This paper presents a comparative analysis of three distinct methods used to calculate the collisional energy loss of heavy quarks in Quark-Gluon Plasma. The study focuses on the calculation of the nuclear suppression factor of charm quarks in Pb-Pb collisions at TeV. All three models are examined using the same numerical evolution based on the well-known Fokker-Planck equation by considering critical phenomena like a non-equilibrium state at the onset of heavy ion collision. The outcomes of each approach are compared with the latest data from ALICE and ATLAS experiments spanning from 2018 to 2022. This study aims to compare the degree of agreement between each approach and recently obtained experimental data, in the intermediate and high regions.

    Comments:
    23 Pages, 7 Figures, 4 Tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2307.06168 [pdf]
    Eur.Phys.J.Plus(2024)·3 citations
  17. 17

    [Submitted on 12 Jul 2023] (cross-list from quant-ph)

    State dependence of tunneling processes and thermonuclear fusion

    Roberto Onofrio · Carlo Presilla

    We discuss the sensitivity of tunneling processes to the initial preparation of the quantum state. We compare the case of Gaussian wave packets of different positional variances using a generalised Woods-Saxon potential for which analytical expressions of the tunneling coefficients are available. Using realistic parameters for barrier potentials we find that the usual plane wave approximation underestimates fusion reactivities by an order of magnitude in a range of temperatures of practical relevance for controlled energy production.

    Comments:
    6 pages, 5 figures
    Subjects:
    Quantum Physics (quant-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2307.06172 [pdf]
    NPA(2024)·1 citation
  18. 18

    [Submitted on 12 Jul 2023] (cross-list from hep-ph)

    In-medium gluon radiation spectrum with all-order resummation of multiple scatterings in longitudinally evolving media

    Carlota Andres🇫🇷 · Liliana Apolinário🇵🇹 · Fabio Dominguez🇪🇸 · Marcos Gonzalez Martinez🇪🇸

    Over the past years, there has been a sustained effort to systematically enhance our understanding of medium-induced emissions occurring in the quark-gluon plasma, driven by the ultimate goal of advancing our comprehension of jet quenching phenomena. To ensure meaningful comparisons between these new calculations and experimental data, it becomes crucial to model the interplay between the radiation process and the evolution of the medium parameters, typically described by a hydrodynamical simulation. This step presents particular challenges when dealing with calculations involving the resummation of multiple scatterings, which have been shown to be necessary for achieving an accurate description of the in-medium emission process. In this paper, we extend our numerical calculations of the fully-resummed gluon spectrum to account for longitudinally expanding media. This new implementation allows us to quantitatively assess the accuracy of previously proposed scaling laws that establish a correspondence between an expanding medium and a ``static equivalent''. Additionally, we show that such scaling laws yield significantly improved results when the static reference case is replaced by an expanding medium with the temperature following a simple power-law decay. Such correspondence will enable the application of numerical calculations of medium-induced energy loss in realistic evolving media for a broader range of phenomenological studies.

    Comments:
    32 pages, 16 figures, version published in JHEP
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2307.06226 [pdf]
    JHEP(2024)·19 citations
  19. 19

    [Submitted on 12 Jul 2023] (cross-list from hep-ph)

    Diffractive Deep Inelastic Scattering in the Dipole Picture at Next-to-Leading Order

    G. Beuf🇵🇱 · H. Hänninen🇫🇮 · T. Lappi🇫🇮 · H. Mäntysaari🇫🇮 · Y. Mulian🇪🇸

    We calculate the contribution from the state production to the diffractive cross sections in deep inelastic scattering at high energy. The obtained cross section is finite by itself, and consists a part of the full next-to-leading order result for the diffractive structure functions. Our calculation for the diffractive structure functions is performed using exact kinematics, under the shockwave approximation of the scattering process. Once the calculation is completed, we show that the previously known behaviour at the high- and large- regime can be extracted from our results by taking the appropriate limits. Furthermore, we discuss the steps required to obtain the complete next-to-leading order results for the structure functions in the color glass condensate (CGC) formalism, and the application of these results to phenomenology.

    Comments:
    DIS2023, talk by HH; 5 pages, 3 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2307.06321 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE