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Nuclear Theory·nucl-th

Thursday·June 16, 2022

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    Semi-local nuclear forces from chiral EFT: State-of-the-art & challenges

    E. Epelbaum🇩🇪 · H. Krebs🇩🇪 · P. Reinert🇩🇪

    Recently, a new generation of nuclear forces has been developed in the framework of chiral EFT. An important feature of these potentials is a novel semi-local regularization approach that combines the advantages of a local regulator for long-range interactions with the convenience of an angle-independent nonlocal regulator for contact interactions. The authors discuss the key features of the semi-local two-nucleon potentials and demonstrate their outstanding performance in the two-nucleon sector by showing selected results up to fifth order in the EFT expansion. Also reviewed are applications to heavier systems, which are currently limited to third chiral order. This limitation reflects the conceptual difficulty in constructing a consistently regularized many-body forces and current operators and affects all currently available interactions. The authors outline possible ways to tackle this problem and discuss future directions in the field.

    nucl-thnucl-ex18 citations
  2. 02

    Precision tests of the nonlinear mode coupling of anisotropic flow via high-energy collisions of isobars

    Jiangyong Jia🇺🇸 · Giuliano Giacalone🇩🇪 · Chunjian Zhang🇺🇸

    Valuable information on the dynamics of expanding fluids can be inferred from the response of such systems to perturbations in their initial geometry. We apply this technique in high-energy Ru+Ru and Zr+Zr collisions to scrutinize the expansion dynamics of the quark-gluon plasma, where the initial geometry perturbations are sourced by the differences in deformations and radial profiles between Ru and Zr, and the collective response is captured by the change in anisotropic flow between the two collision systems. Using a transport model, we analyze how the nonlinear coupling between lower-order flow harmonics and to the higher-order flow harmonics and , expected to scale as and , gets modified as one moves from Ru+Ru to Zr+Zr systems. We find that these scaling relations are valid to high precision: variations of order 20\% in and due to differences in quadrupole deformation, octupole deformation, and nuclear skin modify and by about 1--2\%. Percent-level deviations are however larger than the expected experimental uncertainties and could be measured. Therefore, collisions of isobars with different nuclear structures are a unique tool to isolate subtle nonlinear effects in the expansion of the quark-gluon plasma that would be otherwise impossible to access in a single collision system.

    nucl-thhep-phnucl-exChin.Phys.Lett.(2023)·24 citations
  3. 03

    Calculation of Coulomb breakup cross sections using a new Coulomb dynamical polarization potential

    H. M. Maridi · K. Rusek · N. Keeley

    A new method for calculating the Coulomb breakup of unstable neutron-rich isotopes at high energies is presented. The calculations employ the eikonal approximation and use a new Coulomb dynamical polarization potential (CDPP), calculated by solving the Schrödinger equation for the entire motion of the exotic projectile as a two-body cluster structure using the adiabatic approximation and incorporating excitations to the continuum. Calculations for some exotic isotopes are compared with Coulomb dissociation cross section data and found to be in good agreement.

    nucl-thPRC(2022)·1 citation
  4. 04

    Quasideuterons in Light Nuclei

    H. Müther · Praveen C. Srivastava

    The role of pairing correlations for nucleon pairs with isospin and is investigated for nuclei in the mass region . For that purpose the two-nucleon densities resulting from nuclear shell-model calculations in one and two major shells are analyzed. Significant effects on the resulting energies are observed due to the formation of pairs. The formation of quasi-deuterons is maximal for symmetric nuclei with . The formation of pairs is less sensitive to the density of single-particle states close to the Fermi energy than the pairing and is relevant also for excitations across shell-closures. This robustness also explains why pairing does not lead to such a clear evidence in comparing energies of neighbored nuclei as the "odd-even mass staggering" due to the formation of pairing.

    nucl-thJ.Phys.G(2023)·1 citation

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first authorsco-authorsvia INSPIRE