PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·October 11, 2023

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    [Submitted on 10 Oct 2023]

    Isomeric excitation of ^{229}\mathrm{Th} via scanning tunneling microscope

    Xue Zhang · Tao Li · Xu Wang · Hui Dong

    The low energy of the isomeric state of the radionuclide thorium-229 (229Th) makes it highly promising for applications in fundamental physics, precision metrology, and quantum technologies. However, directly accessing the isomeric state from its ground state remains a challenge. We propose here a tabletop approach utilizing the scanning tunneling microscope (STM) technique to induce excitation of a single 229Th nucleus. With achievable parameters, the isomeric excitation rate is advantageous over existing methods, allowing the excitation and control of 229Th on the single-nucleus level. It offers the unique potential of exciting and detecting subsequent decay from a single nucleus, providing a new direction for future experimental investigation of the 229Th isomeric state.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2310.06352 [pdf]
    PRC(2024)·1 citation
  2. 02

    [Submitted on 10 Oct 2023]

    Time-Dependent Superfluid Band Theory for the Inner Crust of Neutron Stars: Current Status and Future Challenges

    Kazuyuki Sekizawa · Kenta Yoshimura

    In this contribution, current status and future prospects of our ongoing project is summarized. In the inner crust of neutron stars, a variety of crystalline structures may emerge, as a result of competition of Coulomb and nuclear interactions, which are immersed in a sea of superfluid neutrons. The best quantum mechanical approach to study properties of dripped neutrons under a periodic potential is the band theory of solids. Concerning the band structure effects on transport properties of neutrons, however, situation is complicated and there has not been established a clear consensus yet. To provide a robust conclusion on the band structure effects, we have developed a fully-microscopic time-dependent band theory based on time-dependent density functional theory (TDDFT), taking full account of Fermionic superfluditiy. We have successfully developed a parallel computational code and applied it to the slab phase of nuclear matter. We introduce ongoing works and discuss possible future directions.

    Comments:
    10 pages, 1 figure, 1 table, Proceedings of the 34th IUPAP Conference on Computational Physics (CCP2023), Kobe, Japan, Aug. 4-8, 2023
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Superconductivity (cond-mat.supr-con)
    arXiv:
    2310.06411 [pdf]
    1 citation
  3. 03

    [Submitted on 10 Oct 2023]

    Systematic calculations of cluster radioactivity half-lives with a screened electrostatic barrier

    Xiao Liu · Jie-Dong Jiang · Lin-Jing Qi · Yang-Yang Xu · Xi-Jun Wu · Xiao-Hua Li

    In the present work, based on Wentzel-Kramers-Brillouin theory, we systematically study the cluster radioactivity half-lives of 22 nuclei ranging from to by using a phenomenological model, which considers the screened electrostatic effect of Coulomb potential. In this model, there are two adjustable parameters i.e. the parameter and , which are related to the screened electrostatic barrier and the strength of spectroscopic factor, respectively. The calculated results indicate this model can well reproduce the experimental data while the corresponding root-mean-square (rms) deviation is 0.660. In addition, we extend this model to predict the half-lives of possible cluster radioactive candidates whose cluster radioactivity are energetically allowed or observed but not yet quantified in the evaluated nuclear properties table NUBASE2020. The predicted results are consistent with the ones obtained by using other theoretical models and/or empirical formulae including the universal decay law (UDL) proposed by Qi \textit{et al.} [Phys. Rev. C 80, 044326 (2009)], a semi-empirical model for both decay and cluster radioactivity proposed by Santhosh \textit{et al.} [J. Phys. G 35, 085102 (2008)] and a unified formula of half-lives for decay and cluster radioactivity proposed by Ni \textit{et al.} [Phys. Rev. C 78, 044310 (2008)].

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2310.06597 [pdf]
    CPC(2023)·7 citations
  4. 04

    [Submitted on 10 Oct 2023]

    Fate of critical fluctuations in an interacting hadronic medium using maximum entropy distributions

    Jan Hammelmann🇩🇪 · Marcus Bluhm🇫🇷 · Marlene Nahrang🇫🇷 · Hannah Elfner🇩🇪

    We study the evolution of critical fluctuations in an expanding system within a hadronic transport approach. The initialization of the system with critical fluctuations is achieved by coupling the ideal hadron resonance gas cumulants to the ones from the 3d Ising model and generating the net and total particle number distribution from the principle of maximum entropy. These distributions are then evolved using realistic hadronic interactions. We systematically investigate the evolution of the critical fluctuations initialized at various temperatures and chemical potentials along a freeze-out line. We find that resonance regeneration and isospin randomization processes have the strongest influence on the evolution of the fluctuations. Additionally, the sets of particles coupled to the critical mode are modified to assess the strength of the propagation of correlations through interactions. We find that in the scaling region of the critical point correlations are propagated through the whole collisional history and are still present after the kinetic freeze-out of the matter if the coupling strength is large enough.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2310.06636 [pdf]
    PRC(2024)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE