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Nuclear Theory·nucl-th

Friday·April 12, 2024

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 01

    Multifractal Dimension Spectrum Analysis for Nuclear Density Distribution

    Weihu Ma · Yu-Gang Ma · Wanbing He · Bo Zhou

    We present an integral density method for calculating the multifractal dimension spectrum for the nucleon distribution in atomic nuclei. This method is then applied to analyze the non-uniformity of the density distribution in several typical types of nuclear matter distributions, including the Woods-Saxon distribution, the halo structure and the tetrahedral clustering. The subsequent discussion provides a comprehensive and detailed exploration of the results obtained. The multifractal dimension spectrum shows remarkable sensitivity to the density distribution, establishing it as an effective tool for studying the distribution of nucleons in nuclear multibody systems.

    nucl-thnucl-exChaos(2024)·3 citations
  2. 02

    A new scheme for isomer pumping and depletion with high-power lasers

    C.-J. Yang · K. M. Spohr · M. Cernaianu · D. Doria · P. Ghenuche · V. Horny

    We propose a novel scheme for the population and depletion of nuclear isomers. The scheme combines the -photons with energies keV emitted during the interaction of a contemporary high-intensity laser pulse with a plasma and one or multiple photon beams supplied by intense lasers. Due to nonlinear effects, two- or multi-photon absorption dominates over the conventional multi-step one-photon process for an optimized gamma flash. Moreover, this nonlinear effect can be greatly enhanced with the help of externally supplied low-energy photons coming from another laser. These low-energy photons act such that the effective cross-section experienced by the -photons becomes tunable, growing with the intensity of the beam. Assuming Wcm for the photon beam, an effective cross-section as large as cm to cm for the photon can be achieved. Thus, within state-of-the-art 10 PW laser facilities, the yields from two-photon absorption can reach to isomers per shot for selected states that are separated from their ground state by E2 transitions. Similar yields for transitions with higher multipolarities can be accommodated by multi-photon absorption with additional photons provided.

    nucl-thnucl-exMatter Radiat.Extremes(2025)·6 citations
  3. 03

    Astrophysics and Nuclear Physics Informed Interactions in Dense Matter: Inclusion of PSR J0437-4715

    Tuhin Malik🇵🇹 · Veronica Dexheimer🇺🇸 · Constança Providência🇵🇹

    We investigate how vector-isoscalar and vector-isovector interactions can be determined within the density regime of neutron stars (NSs), while fulfilling nuclear and astrophysics constrains. We make use of the Chiral Mean Field (CMF) model, a SU(3) nonlinear realization of the sigma model within the mean-field approximation, for the first time within a Bayesian analysis framework. We show that neutron-matter EFT constraints at low density are only satisfied if the vector-isovector mixed interaction term is included, e.g., a term. We also show the behavior of the model with respect to the conformal limit. We demonstrate that the CMF model is able to predict a value for the parameter related to the trace anomaly and its derivative takes values below 0.2 above four times saturation density within a hadronic version of the model that does not include hyperons or a phase transition to deconfined matter. We compare these effects with results from other (non-chiral) Relativistic Mean Field models to assess how different approaches to incorporating the same physical constraints affect predictions of NS properties and dense matter equations of state. We also include data from the gravitation wave event GW230529 detected by the LIGO-Virgo-Kagra collaboration and the most recent radius measurement of PSR J0437-4715 from the NASA NICER mission. Our analysis reveals that this new NICER measurement leads to an average reduction of approximately km radius in the posterior of the NS mass-radius relationship.

    nucl-thastro-ph.HEgr-qchep-phPRD(2024)·31 citations

Affiliations

first authorsco-authorsvia INSPIRE