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Nuclear Theory·nucl-th

Monday·February 15, 2021

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    [Submitted on 12 Feb 2021]

    User guide for the hfbcs-qrpa(v1) code

    Gianluca Colò · Xavier Roca-Maza

    We briefly explain the structure of the Hartree-Fock-Bardeen-Cooper-Schrieffer (HFBCS) and Quasi-particle Random Phase Approximation (QRPA) code hfbcs-qrpa, highlighting only the differences with the code skyrme_rpa that has been previously published [G. Colò, L. Cao, N. Van Giai, and L. Capelli, Comp. Phys. Comm. 184, 142 (2013)]. The code deals with open shell spherical systems and non-spin flip, non-charge-exchange and natural parity excitations.

    Comments:
    The program can be downloaded from: http://www0.mi.infn.it/~colo/hfbcs-qrpa.tar http://www0.mi.infn.it/~jroca/code/code.html
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2102.06562 [pdf]
    24 citations
  2. 02

    [Submitted on 9 Feb 2021]

    The role of the electric Bond number in the stability of pasta phases

    Sebastian Kubis · Włodzimierz Wójcik

    The stability of pasta phases in cylindrical and spherical Wigner-Seitz (W-S) cells is examined. The electric Bond number is introduced as the ratio of electric and surface energies. In the case of a charged rod in vacuum, other kinds of instabilities appear in addition to the well known Plateau- Rayleigh mode. For the case of a rod confined in a W-S cell the variety of unstable modes is reduced. It comes from the virial theorem, which bounds the value of the Bond number from above and reduces the role played by electric forces. A similar analysis is done for the spherical W-S cell, where it appears that the inclusion of the virial theorem stabilizes all of the modes.

    Comments:
    8 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2102.06675 [pdf]
    PLB(2022)·2 citations
  3. 03

    [Submitted on 10 Feb 2021]

    Theoretical Study of Isotope Production in The Peripheral Heavy-ion Collision 136Xe + Pb at 1 GeV/nucleon

    H. Imal🇹🇷 · R. Ogul🇹🇷

    We have studied the fragment yields emitted from the fragmentation of excited projectile nuclei in peripheral collisions of 136Xe+Pb at 1 GeV/nucleon, and measured with the high-resolution magnetic spectrometer, the Fragment Separator (FRS) of GSI. The mass, charge and isotope distributions of nuclear fragments formed in the reactions were calculated within a statistical ensemble approach and compared to the experimental data. The ensemble of excited projectilelike source nuclei were created in the framework of a previous analysis of similar reactions performed at 600 MeV/nucleon (ALADIN-experiments, GSI). In addition, the ensemble of the low-excited compound nuclei is involved in the analysis. The overall agreement between theory and experiment was very satisfactory in reproducing the experimental data of isotope yields measured in the heavy-ion collisions. It is confirmed that a broad range of elements can be reproduced within a universal statistical disintegration of the excited projectile residues.

    Comments:
    12 pages, 2 figures and one table. arXiv admin note: text overlap with arXiv:0806.3455, arXiv:1912.09277, arXiv:nucl-th/0510081 by other authors
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2102.06686 [pdf]
    NPA(2021)·5 citations
  4. 04

    [Submitted on 12 Feb 2021]

    Pocket resonances in low-energy antineutrons reactions with nuclei

    Teck-Ghee Lee🇺🇸 · Orhan Bayrak🇹🇷 · Cheuk-Yin Wong🇺🇸

    Upon investigating whether the variation of the antineutron-nucleus annihilation cross-sections at very low energies satisfy Bethe-Landau's power law of behavior as a function of the antineutron momentum , we uncover unexpected regular oscillatory structures in the low antineutron energy region from 0.001 to 10 MeV, with small amplitudes and narrow periodicity in the logarithm of the antineutron energies, for large- nuclei such as Pb and Ag. Subsequent semiclassical analyses of the matrices reveal that these oscillations are pocket resonances that arise from quasi-bound states inside the pocket and the interference between the waves reflecting inside the optical potential pockets with those from beyond the potential barriers, implicit in the nuclear Ramsauer effect. They are the continuation of bound states in the continuum. Experimental observations of these pocket resonances will provide vital information on the properties of the optical model potentials and the nature of the antineutron annihilation process.

    Comments:
    10 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2102.06691 [pdf]
    PLB(2021)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE