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Nuclear Theory·nucl-th

Monday·January 10, 2022

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    Coherence dynamics in low-energy nuclear fusion

    Iain Lee🇬🇧 · Alexis Diaz-Torres🇬🇧

    Low-energy nuclear fusion reactions have been described using a dynamical coupled-channels density matrix method, based on the theory of open quantum systems. For the first time, this has been combined with an energy projection method, permitting the calculation of energy resolved fusion probabilities. The results are benchmarked against calculations using stationary Schrödinger dynamics and show excellent agreement. Calculations of entropy, energy dissipation and coherence were conducted, demonstrating the capability of this method. It is evident that the presence of quantum decoherence does not affect fusion probability. This framework provides a basis for quantum thermodynamic studies using thermal environments.

    nucl-thnucl-exquant-phPLB(2022)·10 citations
  2. 02

    Information content of the differences in the charge radii of mirror nuclei

    Paul-Gerhard Reinhard · Witold Nazarewicz

    Differences in the charge radii of mirror nuclei have been recently suggested to contain information on the slope of the symmetry energy L. To test this hypothesis, we perform statistical correlation analysis using quantified energy density functionals that are consistent with our previous knowledge on global nuclear observables such as binding energies and charge radii. We conclude that the difference in charge radii between a mirror pair, R_mir, is an inferior isovector indicator compared to other observables, such at the neutron skin or electric dipole polarizability. In particular, this quantity correlates poorly with both the neutron skin and L. We demonstrate that R_mir is influenced by pairing correlations in the presence of low-lying proton continuum in the proton-rich mirror-partner nucleus. Considering the large theoretical uncertainties on R_mir, we conclude that the precise data on mirror charge radii cannot provide a stringent constraint on L.

    nucl-thPRC(2022)·44 citations
  3. 03

    Practical considerations for the effect of finite coverage on the azimuthal dependence of global spin alignment

    Chao Zhang🇨🇳 · Peng Yang🇨🇳 · Feng Liu🇨🇳 · Biao Tu🇨🇳

    The global spin alignment of vector mesons is a powerful probe to study the vorticity field of the system produced in non-central relativistic heavy-ion collisions. Since the experimental observables of global spin alignment are sensitive to many factors, proper corrections are need to be taken care of when measuring the global spin alignment of vector mesons. In this paper, we propose a method to correct the effect of finite pseudo-rapidity coverage when extract the azimuthal dependence of spin alignment parameter . The effects of the finite pseudo-rapidity coverage on the azimuthal dependence of meson spin alignment and the potentially exist intrinsic spin alignment effects are taken into consideration. The method presented in this paper is verified in a Monte-Carlo simulation, it allows the measurements of azimuthal dependence of global spin alignment to be conducted properly and accurately.

    nucl-thnucl-exPRC(2022)·0 citations
  4. 04

    Characterization of the inner edge of the neutron star crust

    R. Shafieepour · H.R. Moshfegh · J. Piekarewicz

    The poorly known crustal equation of state plays a critical role in many observational phenomena associated with a neutron star. Using semi-classical Monte Carlo simulations, we explore the possible configurations of the inner edge of the neutron-star crust for a variety of baryon densities and proton fractions. Applying the Kirkwood--Buff theory to these two-component systems, we observe how the isothermal compressibility reaches a maximum when isolated non-symmetric clusters are formed in an extremely dilute neutron gas. To determine the neutron fraction, we suggest a geometrical model based on the behavior of the proton-neutron pair correlation function. Accordingly, the equation of state of the inner crust is calculated, illustrating that the nuclear energy in beta-equilibrium follows a power-law behavior with baryon density. As a possible astrophysical outcome of this study, our results could help refine the mass-radius relation. Finally, our results pave the way towards further investigations of the impact of the proton-neutron pair correlation function on transport properties within the neutron-star crust.

    nucl-thPRC(2022)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE