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Nuclear Theory·nucl-th

Tuesday·March 23, 2021

13 papers—5 primary·8 cross-listed

All13Primary5Cross-lists8
  1. 01

    Study of resonances in exotic drip-line nuclei by the use of super-symmetric quantum mechanics

    Md. A. Khan🇮🇳 · M. Hasan🇮🇳 · S. H. Mondal🇮🇳 · M. Alam🇮🇳 · T. Surungan

    In this paper, a nice theoretical scheme is presented to investigate resonant and bound states in weakly bound nuclear systems by the use of isospectral potentials together with hyperspherical harmonics expansion. In this scheme, a new potential is constructed which is strictly isospectral with the original shallow potential and has properties that are desirable to calculate resonances more accurately and elegantly. The effectiveness of the method has been checked in terms of its application to the resonances in the neutron-rich isotopes C in the two-neutron plus core three-body cluster model. The results are in excellent agreement with the available data.

    nucl-th0 citations
  2. 02

    Model of Energy Dependent Total, Absorption, and 3He and 3H Production Cross Sections in 4He-proton Collisions

    Congchong Yan🇨🇳 · Premkumar B. Saganti🇺🇸 · Francis A. Cucinotta🇺🇸

    Light ion (A<5) breakup cross sections are important for studies of cosmic ray interactions in the inter-stellar medium or radiation protection considerations of energy deposition in tissue. Nucleon abrasion cross sections for heavy ion reactions are often calculated using the Glauber model in the large mass limit or with the Eikonal form of the optical potential model. Here we formulate an abrasion model for 4He nuclei fragmentation on hydrogen targets with a classical model for final state interactions. Comparisons to the heavy ion abrasion model are made. Calculations of energy dependent total, absorption, elastic and breakup cross sections for 4He into 3He or 3H with protons targets are shown to be in good agreement with experimental measurements for energies from 100 to 100,000 MeV/u. The Glauber model for light nuclei and the large mass limit to the model are shown to be in close agreement for 4He-proton interactions above 300 MeV/u, however important differences occur at lower energies.

    nucl-thastro-ph.SRNucl.Instrum.Meth.B(2021)·1 citation
  3. 03

    Magneto-vortical Effect in Strong Magnetic Field

    Shu Lin🇨🇳 · Lixin Yang🇨🇳

    We develop covariant chiral kinetic theory with Landau level basis. We use it to investigate a magnetized plasma with a transverse electric field and a steady vorticity as perturbations. After taking into account vacuum shift in the latter case, we find the resulting current and stress tensor in both cases can be matched consistently with constitutive equations of magnetohydrodynamics. We find the solution in the vorticity case contains both shifts in temperature and chemical potential as well as excitations of the lowest Landau level states. The solution gives rise to an vector charge density and axial current density. The vacuum parts coming from both shifts and excitations agree with previous studies and the medium parts coming entirely from excitations leads to a new contribution to vector charge and axial current density consistent with standard chiral vortical effect.

    nucl-thcond-mat.mes-hallhep-phJHEP(2021)·15 citations
  4. 04

    Direct and sequential four-body recombination rates at low temperatures

    E. Garrido · A.S. Jensen

    We investigate four-body nuclear reactions in stellar environments contributing to creation of light nuclei, exemplified by Be and C. The originally assumed process is radiative capture, where nuclear clusters combine into the excited final nucleus and photon emission populates the stable nuclear ground states. Instead, we consider nuclear four-body recombination reactions where a spectator nuclear particle replaces the photon. We first develop the elaborate formalism for both, direct and sequential capture processes, where the decaying three-body resonance is formed without and with population of an intermediate two-body resonance, respectively. To facilitate both calculations and practical applications we parameterize the involved cross sections as done successfully in previous computations of reaction rates. We consider the lowest-lying nuclear states with their dominant contributions at low stellar temperatures. We calculate and compare reaction and production rates for different processes. The direct reaction mechanism dominates by many orders of magnitude at low temperature, where the sequential stepping stones are energetically too expensive to use. At somewhat higher temperatures these two different nuclear four-body mechanisms become comparable. Comparison to radiative three-body capture reveals already formally, but also numerically, that four-body nuclear recombination must dominate for sufficiently high nuclear densities. Numerical values are given for all these rates as function of temperature and density. The relative importance is exhibited.

    nucl-thastro-ph.SRPRC(2021)·2 citations
  5. 05

    Cluster structure of 21Ne and 21Na

    R. Bijker🇲🇽 · F. Iachello🇺🇸

    We study the cluster structure of 21Ne and 21Na within the framework of the cluster shell model (CSM) and show that they have a complex cluster structure with the coexistence of a 20Ne+n, 20}Ne+p structure and a 19Ne+2n, 19}F+2p structure. Seven rotational bands are identified in 21Ne and four in 21Na and assigned to single-particle cluster states, single-hole cluster states and vibrational states. The single-particle states are associated with the 20Ne+n and 20Ne+p cluster structure, while the single-hole states are associated with the 19Ne+2n and 19F+2p structure.

    nucl-thnucl-exNPA(2021)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE