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Nuclear Theory·nucl-th

Monday·March 18, 2024

3 papers—3 primary·0 cross-listed

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  1. 01

    [Submitted on 13 Mar 2024]

    Effects of Finite Temperature and Pairing Correlations in Multi- Hypernuclei

    Bahruz Suleymanli🇹🇷 · Kutsal Bozkurt🇹🇷 · Elias Khan🇫🇷 · Haşim Güven🇫🇷 · Jérôme Margueron🇫🇷

    The influence of finite temperatures and pairing correlations on the ground state properties of multi - Ca, Sn and Pb hypernuclei is explored using finite temperature Hartree Fock Bogoliubov approach and contact pairing interaction. A critical temperature is predicted and is in agreement with the Bardeen Cooper Schrieffer relationship , beyond which pairing correlations drop to zero. Particle densities, single particle energies, and nuclear radii are weakly impacted by pairing as well as by finite temperatures. However, other nuclear properties which are more sensitive to pairing correlations, such as pairing gaps, condensation energies, and abnormal densities are also more impacted by finite temperature, especially around the critical temperature. Furthermore, calculations show the occurrence of the pairing re-entrance effect in the Pb hyperon drip line hypernucleus. Our study provides insight into the thermal evolution of pairing, i.e. the emergence and vanishing of pairing correlations in multi hypernuclei as a function of temperature.

    Comments:
    10 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2403.09737 [pdf]
    PRC(2024)·5 citations
  2. 02

    [Submitted on 15 Mar 2024]

    Role of magnetic fields on the outer crust in a magnetar

    Jiang Wei · Chen Yanjun

    We explore the properties of 4110 nuclides from Z = 5 to Z = 82 with the Sky3D code and the composition of the outer crust in the magnetars under extreme magnetic fields. The effects of the variation of the nuclear masses due to the magnetic fields on the outer crust are comprehensively studied. The neutron-drip transition pressure, the equation of state and neutron fraction in the outer crust have also been discussed.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2403.10227 [pdf]
    CPC(2024)·8 citations
  3. 03

    [Submitted on 15 Mar 2024]

    Low-energy theorems for neutron-proton scattering in EFT using a perturbative power counting

    Oliver Thim🇸🇪

    Low-energy theorems (LETs) for effective-range parameters in nucleon-nucleon scattering encode properties of the long-range part of the nuclear force. We compute LETs for S-wave neutron-proton scattering using chiral effective field theory with a modified version of Weinberg power counting. Corrections to the leading order amplitude are included in distorted-wave perturbation theory and we incorporate contributions up to the third order in the power counting. We find that LETs in the and partial waves agree well with empirical effective-range parameters. At the same time, phase shifts up to laboratory scattering energies of about 100 MeV can be reproduced. We show that it is important to consider the pion mass splitting in the one-pion exchange potential in the partial wave while the effect is negligible in the partial wave. We conclude that pion exchanges, as treated in this power counting, accurately describe the long-range part of the -wave nuclear interaction.

    Comments:
    25 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2403.10292 [pdf]
    Few Body Syst.(2024)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE