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Nuclear Theory·nucl-th

Thursday·April 28, 2022

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    Simulating fusion reactions from Coulomb explosions within a transport approach

    Zhe Zhu · Jun Xu · Guo-Qiang Zhang

    We have studied nuclear fusion reactions from the Coulomb explosion of deuterium clusters induced by high-intensity laser beams within a transport approach. By incorporating the D+D n + He channel as inelastic collisions based on the stochastic method, we have calibrated the neutron yield from the simulation in a box system with that from the reaction rate equation. After justifying the Coulomb explosion of a single cluster by comparing results with available theoretical limits, we have then investigated the dynamics from Coulomb explosions of systems with different cluster numbers and different deuteron numbers in clusters. We find that the kinetic energy spectrum of deuterons at the final stage is different from that when neutrons are abundantly produced, corresponding to significantly different reaction rates. We also extrapolate the neutron yield result from small systems to large systems based on an intuitive parameterized form and compare with the available experimental result. The present framework can be extended by incorporating more channels, and useful for further studies of nuclear fusion reactions in plasma systems at higher energies reached in more recent experiments.

    nucl-thphysics.plasm-phPRC(2022)·1 citation
  2. 02

    Ab initio studies of double Gamow-Teller transition and its correlation with neutrinoless double beta decay

    J. M. Yao🇨🇳 · I. Ginnett🇨🇦 · A. Belley🇨🇦 · T. Miyagi🇩🇪 · R. Wirth🇺🇸 · S. Bogner🇺🇸 · J. Engel🇺🇸 · H. Hergert🇺🇸 · J. D. Holt🇨🇦 · S. R. Stroberg🇺🇸

    We use chiral interactions and several {\em ab initio} methods to compute the nuclear matrix elements (NMEs) for ground-state to ground-state double Gamow-Teller transitions in a range of isotopes, and explore the correlation of these NMEs with those for neutrinoless double beta decay produced by the exchange of a light Majorana neutrino. When all the NMEs of both isospin-conserving and isospin-changing transitions from the {\em ab initio} calculations are considered, the correlation is strong. For the experimentally relevant isospin-changing transitions by themselves, however, the correlation is weaker and may not be helpful for reducing the uncertainty in the NMEs for neutrinoless double-beta decay.

    nucl-thhep-phnucl-exPRC(2022)·28 citations
  3. 03

    The linear mode analysis and spin relaxation

    Jin Hu🇨🇳

    In this paper, a detailed analysis on normal modes of the linearized Hermite collision operator is presented, which follows from linearizing spin Boltzmann equation for massive fermions proposed in \cite{Weickgenannt:2021cuo} with the non-diagonal part of the transition rate neglected and approximating what we got with a mutilated operator. With the assumption of total angular momentum conservation, the collision term is proved to well describe the equilibrium state and gives proper interpretation for collisional invariants, thus is relevant for the research on local spin polarization. Following the familiar fashion as used in quantum mechanics, we treat the problem of solving normal modes as a degenerate perturbation problem and calculate the dispersion relations for intriguing eleven zero modes, which form one-to-one correspondence to all collisional invariants. We find that the results of spinless modes appearing in ordinary hydrodynamics are consistent with available conclusions in textbooks. As for spin-related modes, we obtain the frequencies up to second order in wave vector and relate them with the dissipation of spin density fluctuation. In addition, the ratio of two relaxation time scales for spin and momentum is shown as a function of reduced mass, which reads that based on present framework spin equilibration is almost as slow as momentum equilibration as far as the strange quark spins in quark gluon plasma (QGP) are concerned.

    ↳ hep-phnucl-thPRD(2022)·16 citations
  4. 04

    Refined nuclear magnetic dipole moment of rhenium: Re and Re

    Leonid V. Skripnikov · Sergey D. Prosnyak

    The refined values of the magnetic dipole moments of Re and Re nuclei are obtained. For this, we perform a combined relativistic coupled cluster and density functional theory calculation of the shielding constant for the ReO anion. In this calculation, we explicitly include the effect of the finite nuclear magnetization distribution in the single-particle nuclear model using the Woods-Saxon potential for the valence nucleon. By combining the obtained value of the shielding constant ~ppm with the available experimental nuclear magnetic resonance data we obtain the values: , where the first uncertainty is the experimental one and the second is due to theory. The refined values of magnetic moments are in disagreement with the tabulated values, , which were obtained using the shielding constant value calculated for the atomic cation Re rather than the molecular anion. The updated values of the nuclear magnetic moments resolve the disagreement between theoretical predictions of the hyperfine structure of H-like rhenium ions which were based on the tabulated magnetic moment values and available experimental measurements. Using these experimental data we also extract the value of the parameter of nuclear magnetization distribution introduced in [J. Chem. Phys. \textbf{153}, 114114 (2020)], which is required to predict hyperfine structure constants for rhenium compounds.

    ↳ physics.atom-phnucl-thphysics.chem-phPRC(2022)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE