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Nuclear Theory·nucl-th

Friday·July 23, 2021

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 01

    On the linear causality and stability of third-order relativistic dissipative fluid dynamics

    C. V. Brito🇧🇷 · G. S. Denicol🇧🇷

    We analyze the linear causality and stability of third-order fluid dynamics considering perturbations around a global equilibrium state. We investigate the formulation derived from kinetic theory, using the Chapman-Enskog expansion, in PRC 88, 021903, which was shown to be in excellent agreement with solutions of the microscopic theory. From this analysis, we demonstrate that this theory is linearly acausal and unstable and that such instabilities cannot be corrected by tuning the transport coefficients. We then propose a modification of this theory, valid only in the linear regime, that can be constructed to be linearly causal and stable and obtain the conditions the transport coefficients must satisfy in order for this to be the case.

    nucl-thhep-thPRD(2022)·28 citations
  2. 02

    Impact of clustering on the Li decay and recoil form factors

    G. H. Sargsyan · K. D. Launey · M. T. Burkey · A. T. Gallant · N. D. Scielzo · G. Savard · A. Mercenne · T. Dytrych · D. Langr · L. Varriano · B. Longfellow · T. Y. Hirsh · J. P. Draayer

    We place unprecedented constraints on recoil corrections in the decay of Li, by identifying a strong correlation between them and the Li ground state quadrupole moment in large-scale ab initio calculations. The results are essential for improving the sensitivity of high-precision experiments that probe the weak interaction theory and test physics beyond the Standard Model (BSM). In addition, our calculations predict a state of the system that is energetically accessible to decay but has not been observed in the experimental Be energy spectrum, and has an important effect on the recoil corrections and decay for the systems. This state and an associated state are notoriously difficult to model due to their cluster structure and collective correlations, but become feasible for calculations in the ab initio symmetry-adapted no-core shell-model framework.

    nucl-thnucl-exPRL(2022)·44 citations
  3. 03

    Relativistic Brueckner-Hartree-Fock Theory in Infinite Nuclear Matter

    Peter Ring · Sibo Wang · Qiang Zhao · Jie Meng

    On the way of a microscopic derivation of covariant density functionals, the first complete solution of the relativistic Brueckner-Hartree-Fock (RBHF) equations is presented for symmetric nuclear matter. In most of the earlier investigations, the -matrix is calculated only in the space of positive energy solutions. On the other side, for the solution of the relativistic Hartree-Fock (RHF) equations, also the elements of this matrix connecting positive and negative energy solutions are required. So far, in the literature, these matrix elements are derived in various approximations. We discuss solutions of the Thompson equation for the full Dirac space and compare the resulting equation of state with those of earlier attempts in this direction.

    nucl-thEPJ Web Conf.(2021)·2 citations
  4. 04

    Least-squares fitting applied to nuclear mass formulas. Resolution by the Gauss-Seidel method

    Benyoucef Mohammed-Azizi · Hadj Mouloudj

    A numerical method optimizing the coefficients of the semi empirical mass formula or those of similar mass formulas is presented. The optimization is based on the least-squares adjustments method and leads to the resolution of a linear system which is solved by iterations according to the Gauss-Seidel scheme. The steps of the algorithm are given in detail. In practice the method is very simple to implement and is able to treat large data in a very fast way. In fact, although this method has been illustrated here by specific examples, it can be applied without difficulty to any experimental or statistical data of the same type, i.e. those leading to linear system characterized by symmetric and positive-definite matrices.

    nucl-thInt.J.Mod.Phys.C(2022)·0 citations
  5. 05

    A formalism to assess the accuracy of nuclear-structure weak interaction effects in precision -decay studies

    Ayala Glick-Magid🇮🇱 · Doron Gazit🇮🇱

    Multiple high precision -decay measurements are being carried out these days on various nuclei, in search of beyond the Standard Model signatures. These measurements necessitate accurate standard model theoretical predictions to be compared with. Motivated by the experimental surge, we present a formalism for such a calculation of -decay observables, with controlled accuracy, based on a perturbative analysis of the theoretical observables related to the phenomena, including high order nuclear recoil and shape corrections. The accuracy of the corrections is analyzed by identifying a hierarchy of small parameters, related to the low momentum transfer characterizing -decays. Furthermore, we show that the sub-percent uncertainties, targeted by on-going and planned experiments, entail an accuracy of the order of 10\% for the solution of the nuclear many body problem, which is well within the reach of modern nuclear theory for light to medium mass nuclei.

    nucl-thhep-phnucl-exJ.Phys.G(2022)·19 citations
  6. 06

    Electroweak Currents from Chiral Effective Field Theory

    Alessandro Baroni🇺🇸 · Garrett B. King🇺🇸 · Saori Pastore🇺🇸

    Since the pioneering work of Weinberg, Chiral Effective Field Theory (EFT) has been widely and successfully utilized in nuclear physics to study many-nucleon interactions and associated electroweak currents. Nuclear EFT has now developed into an intense field of research and is applied to study light to medium mass nuclei. In this contribution, we focus on the development of electroweak currents from EFT and present applications to selected nuclear electroweak observables.

    nucl-thFew Body Syst.(2021)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE