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Nuclear Theory·nucl-th

Friday·April 24, 2020

7 papers—5 primary·2 cross-listed

All7Primary5Cross-lists2
  1. 06

    Astrophysics in the Laboratory: The CBM Experiment at FAIR

    P. Senger · for the CBM collaboration

    The future Facility for Antiproton and Ion Research (FAIR) is an accelerator-based international center for fundamental and applied research, which presently is under construction in Darmstadt, Germany. An important part of the program is devoted to questions related to astrophysics, including the origin of elements in the universe and the properties of strongly interacting matter under extreme conditions, which are relevant for our understanding of the structure of neutron stars and the dynamics of supernova explosions and neutron star mergers. The Compressed Baryonic Matter (CBM) experiment at FAIR is designed to measure promising observables in high-energy heavy-ion collisions, which are expected to be sensitive to the high-density equation-of-state (EOS) of nuclear matter and to new phases of QCD matter at high densities. The CBM physics program, the relevant observables and the experimental setup will be discussed.

    ↳ nucl-exastro-ph.IMhep-exhep-ph+1Particles(2020)·14 citations
  2. 07

    Probing the core of the strong nuclear interaction

    A. Schmidt🇺🇸 · J. R. Pybus🇺🇸 · R. Weiss🇮🇱 · E. P. Segarra🇺🇸 · A. Hrnjic🇺🇸 · A. Denniston🇺🇸 · O. Hen🇺🇸 · E. Piasetzky🇮🇱 · L. B. Weinstein🇺🇸 · N. Barnea🇮🇱 · M. Strikman🇺🇸 · A. Larionov🇩🇪 and 153 other authors

    The strong nuclear interaction between nucleons (protons and neutrons) is the effective force that holds the atomic nucleus together. This force stems from fundamental interactions between quarks and gluons (the constituents of nucleons) that are described by the equations of Quantum Chromodynamics (QCD). However, as these equations cannot be solved directly, physicists resort to describing nuclear interactions using effective models that are well constrained at typical inter-nucleon distances in nuclei but not at shorter distances. This limits our ability to describe high-density nuclear matter such as in the cores of neutron stars. Here we use high-energy electron scattering measurements that isolate nucleon pairs in short-distance, high-momentum configurations thereby accessing a kinematical regime that has not been previously explored by experiments, corresponding to relative momenta above 400 MeV/c. As the relative momentum between two nucleons increases and their separation thereby decreases, we observe a transition from a spin-dependent tensor-force to a predominantly spin-independent scalar-force. These results demonstrate the power of using such measurements to study the nuclear interaction at short-distances and also support the use of point-like nucleons with two- and three-body effective interactions to describe nuclear systems up to densities several times higher than the central density of atomic nuclei.

    ↳ nucl-exnucl-thNature(2020)·100 citations

Affiliations

first authorsco-authorsvia INSPIRE