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Nuclear Theory·nucl-th

Wednesday·June 19, 2024

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 01

    [Submitted on 18 Jun 2024]

    Dynamics of the conserved net-baryon density near QCD critical point within inhomogeneous quark-gluon plasma profile

    Shanjin Wu🇨🇳

    This paper investigates the dynamics of the net-baryon multiplicity fluctuations near the QCD critical point, within the inhomogeneous temperature and baryon chemical potential profile of quark-gluon plasma from the hydrodynamics. The Langevin dynamics of conserved net-baryon density are solved numerically within the temperature and chemical potential profile borrowing from hydrodynamic simulation. It is found that the local systems at different rapidities reach the critical point at different proper times, owing to the inhomogeneous temperature and chemical potential. As a result, it is observed the pronounced enhancement of the magnitude for the net-baryon multiplicity fluctuations with large rapidity acceptance at the freeze-out surface, which is the consequence of the combined effect of critical slowing down and inhomogeneous profile.

    Comments:
    version accepted by Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2406.12325 [pdf]
    PRC(2025)·5 citations
  2. 02

    [Submitted on 18 Jun 2024]

    Multichannel Dyson equation: derivation and analysis

    Gabriele Riva · Pina Romaniello · J. Arjan Berger

    In a recent letter [Phys. Rev. Lett. 131, 216401] we presented the multichannel Dyson equation (MCDE) in which two or more many-body Green's functions are coupled. In this work we will give further details of the MCDE approach. In particular we will discuss: 1) the derivation of the MCDE and the definition of the space in which it is to be solved; 2) the rationale of the approximation to the multichannel self-energy; 3) a diagrammatic analysis of the MCDE; 4) the recasting of the MCDE on an eigenvalue problem with an effective Hamiltonian that can be solved using standard numerical techniques. This work mainly focuses on the coupling between the one-body Green's function and the three-body Green's function to describe photoemission spectra, but the MCDE method can be generalized to the coupling of other many-body Green's functions and to other spectroscopies.

    Subjects:
    Nuclear Theory (nucl-th); cond-mat.mtrl-sci (cond-mat.mtrl-sci); Strongly Correlated Electrons (cond-mat.str-el)
    arXiv:
    2406.12485 [pdf]
    PRB(2024)·4 citations
  3. 03

    [Submitted on 18 Jun 2024]

    Efficient production of Th via nuclear excitation by electron capture

    Jingyan Zhao · Adriana Pálffy · Christoph H. Keitel · Yuanbin Wu

    The nuclear isomeric state Th with an exceptionally low excitation energy makes the Th isotope a crucial candidate for nuclear clocks and many other applications. Efficient and controllable production of Th is essential and still remains a challenge. Here we report a novel approach for efficient production of Th by the excitation of Th to the above-lying excited state at keV energy via the process of nuclear excitation by electron capture (NEEC). We show theoretically that the production rate of Th per nucleus with accessible conditions can be six orders of magnitude larger than the value experimentally demonstrated using -keV synchrotron radiation for this indirect excitation. With the efficient production of Th, our results identify scenarios, as well as the characteristic NEEC signature with which NEEC events could be unambiguously identified, for a clear experimental identification of the long-sought NEEC phenomenon.

    Comments:
    7 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2406.12497 [pdf]
    PRC(2024)·10 citations
  4. 04

    [Submitted on 18 Jun 2024]

    Two-center harmonic oscillator basis for Skyrme-DFT calculations (I): formalism and Proof of Principle

    Adrián Sánchez-Fernández · Jacek Dobaczewski · Xuwei Sun · Herlik Wibowo

    We present a new method to solve the nuclear density functional theory (DFT) equations using a two-center harmonic oscillator for Skyrme-like functionals, incorporating pairing and Coulomb interactions. The goal is to efficiently determine the fission and fusion configurations in nuclei. The Coulomb exchange term is evaluated exactly, allowing for a novel approach to neck formation without the Slater approximation, commonly used in space coordinate-based approaches. The new method has been implemented in the code {\sc hfodd}, enabling direct comparison with standard one-center solutions. This first paper focuses on deriving and implementing a methodology based on stable, precise, and exact applications of harmonic oscillator bases for the two fragments, which can either overlap or be separated by arbitrarily large distances. The implementation is tested on two proof-of-principle examples using light nuclei, specifically, Be and Mg.

    Comments:
    Accepted manuscript in EPJA. Change of licence
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2406.12545 [pdf]
    EPJA(2025)·1 citation
  5. 05

    [Submitted on 18 Jun 2024]

    Constraining neutron star matter from the slope of the mass-radius curves

    Márcio Ferreira🇵🇹 · Constança Providência🇵🇹

    We analyse the implications of information about local derivatives from the mass-radius diagram in neutron star matter. It is expected that the next generation of gravitational wave and electromagnetic detectors will allow the determination of the neutron star radius and mass with a small uncertainty. Observations of neutron stars clustered around a given neutron star mass allow the estimation of local derivatives in the diagram, which can be used to constrain neutron star properties. From a model-independent description of the neutron star equation of state, it is shown that a curve with a negative slope at 1.4 predicts a neutron star radius below 12 km. Furthermore, a maximum mass below 2.3 is obtained if the slope is negative in the whole range of masses above , and a maximum mass above 2.4 requires the slope to be positive in some range of masses. Constraints on the mass-radius curve of neutron stars will place strong constraints on microscopic models.

    Comments:
    10 pages, 11 figures, title changed, published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2406.12582 [pdf]
    PRD(2024)·22 citations
  6. 06

    [Submitted on 18 Jun 2024]

    Inverse-scattering separable NN potential constrained to phase-shift data up to 2.5 GeV. I.- Uncoupled states

    H. F. Arellano🇨🇱 · N. A. Adriazola🇨🇱

    We introduce a new method to construct, within inverse-scattering theory, an energy-independent separable potential capable of reproducing exactly both phase shift and absorption over a predefined energy range. The approach relies on the construction of non-overlapping multi-rank separable potentials, whose form factors are obtained by solving linear equations on intervals where the matrix does have zeros. Applications are made to nucleon-nucleon interactions constrained to the SAID-SP07 phase-shift analysis up to 2.5 GeV lab energy. The inversion potentials are channel dependent with rank dictated by the number of zeros of the matrix, reproducing the data up to a selected upper momentum. The account for absorption yields complex separable form factors, resulting in a non-Hermitian potential. Applications are restricted to spin-uncoupled states considering a Schrödinger-like wave equation with minimal relativity. Its extension to spin-coupled states and relativistic kernels are discussed.

    Comments:
    21 pages, 12 figures, published in EPJA. Minor corrections made
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2406.12827 [pdf]
    EPJA(2024)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE