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Nuclear Theory·nucl-th

Wednesday·August 25, 2021

11 papers—3 primary·8 cross-listed

All11Primary3Cross-lists8
  1. 01

    Chiral Effective Field Theory's Impact on Advancing Quantum Monte Carlo Methods

    I. Tews🇺🇸 · D. Lonardoni🇺🇸 · S. Gandolfi🇺🇸

    Thirty years ago, Steven Weinberg published his seminal paper on "Nuclear Forces from chiral Lagrangians" which has revolutionized the field of theoretical nuclear physics. Nowadays, interactions derived from chiral effective field theory are routinely used to describe nuclear systems ranging from atomic nuclei to the dense matter explored in the core of neutron stars with theoretical uncertainty estimates. In our contribution to the special issue "Celebrating 30 years of Steven Weinberg's paper Nuclear Forces from Chiral Lagrangians", we focus on the impact that chiral effective field theory interactions have played in advancing microscopic studies of atomic nuclei and the nuclear-matter equation of state using quantum Monte Carlo methods.

    nucl-thFew Body Syst.(2021)·2 citations
  2. 02

    An improved spectral approach for solving the nonclassical neutron particle transport equation

    L.R.C. Moraes · J.K. Patel · R. C. Barros · R. Vasques

    An improvement modification of the Spectral Approach (SA) used for approximating the nonclassical neutral particle transport equation is described in this work. The main focus of the modified SA lies on a slight modification of the nonclassical angular flux representation as a function of truncated Laguerre series. This leads, in some cases, to a considerable decrease of the Laguerre truncation order required to generate accurate solutions. Numerical results are given to illustrate this proposed improvement.

    nucl-th0 citations
  3. 03

    Electron scattering on nuclei from quantum Monte Carlo based approaches

    Lorenzo Andreoli🇺🇸 · Joseph Carlson🇺🇸 · Alessandro Lovato🇺🇸 · Saori Pastore🇺🇸 · Noemi Rocco🇺🇸 · R. B. Wiringa🇺🇸

    We perform first-principle calculations of electron-nucleus scattering on He and H using the Green's function Monte Carlo method and two approaches based on the factorization of the final hadronic state: the spectral-function formalism and the short-time approximation. These three methods are benchmarked among each other and compared to the experimental data for the longitudinal and transverse electromagnetic response functions of He, and the inclusive cross sections of both He and H. Since these three approaches are based on the same description of nuclear dynamics of the initial target state, comparing their results enables a precise quantification of the uncertainties inherent to factorization schemes. At sufficiently large values of the momentum transfer, we find an excellent agreement of the Green's function Monte Carlo calculation with experimental data and with both the spectral-function formalism and the short-time approximation. We also analyze the relevance of relativistic effects, whose inclusion becomes crucial to explain data at high momentum and energy transfer.

    nucl-thPRC(2022)·32 citations

Affiliations

first authorsco-authorsvia INSPIRE