288 research outputs found
Color deconfinement in high energy nuclear collisions
No full textSatz H. Color deconfinement in high energy nuclear collisions. In: Blaizot J-P, Campi X, Ploszajczak M, eds. Nuclear Matter in Different Phases and Transitions. Proceedings of the Workshop Nuclear Matter in Different Phases and Transitions, March 31–April 10, 1998, Les Houches, France. Fundamental Theories of Physics. Vol 95. Dordrecht: Springer Netherlands; 1999: 255-275
Four-Body Continuum with Three-Nucleon Forces
No full textWe present a study of the effect of three-nucleon forces (3NFs) in (formula presented), (formula presented) and (formula presented) scattering at low energies. The used 3NF is derived from effective field theory at next-to-next-to-leading order. The four-nucleon scattering observables are calculated using the Kohn variational principle and the hyperspherical harmonics technique and the results are compared with available experimental data. We have found that the effect of introducing this particular 3NF is in general tiny except for (formula presented) scattering below the opening of the (formula presented) channel. In such a case, the effect of 3NF is evident and a clear dependence on the cutoff used to regularize the high-momentum tail of the interactions is observed. Such a dependence is related to the presence of a poorly known sharp (formula presented) resonance, considered to be the first excited state of (formula presented)
Effective Field Theory Descriptions of Few-Nucleon Systems
No full textThe understanding of nuclear systems as composed of interacting nucleons has been considerably sharpened by the effective field theory (EFT) framework. The latter provides a link between the nuclear interaction and the underlying quantum chromodynamics, as the relevant degrees of freedom result, at least ideally, from a decimation process starting from fundamental quarks and gluons. Owing to chiral symmetry and the Goldstone bosons’ characters of the interchanged pions among nucleons, the properties of heavier nuclei can in principle be traced back to a restricted set of low-energy constants (LECs) to be determined in lighter systems in the framework of a systematic low-energy expansion. At smaller energy scales, in pionless EFT, the interactions simplify becoming of contact type. The low-energy expansion is organized differently, relying on the emergence of universal properties, characteristic of systems with large two-body scattering lengths. We will examine the two above schemes and discuss their relation, with the aim of devising viable power counting schemes for applications in nuclear physics
A.Le Fèvre, M.Ploszajczak, C.Schwarz and Statistical multifragmentation of non-spherical expanding sources
No full textA.Le Fèvre, M.Ploszajczak, C.Schwarz and Statistical multifragmentation of non-spherical expanding sources
No full textMomentum Distributions in (formula presented)He with Chiral Potentials
No full textWe present predictions for the np momentum distributions in (formula presented)He, obtained by applying the most recent high-quality chiral nucleon-nucleon potentials up to fifth order in the chiral expansion, together with the leading chiral three-nucleon force. Three-nucleon interaction contributions as well as chiral convergence are briefly discussed
Five-Nucleon Systems with an Hyperspherical Harmonic Method
No full textinfo:eu-repo/semantics/publishe
Lattice Simulations with Chiral Effective Field Theory for Light and Medium-Mass Nuclei
No full text22nd International Conference on Few-Body Problems in Physics, FB22 2018 -- 9 July 2018 through 13 July 2018 -- -- 235809In this proceedings we present recent results from lattice simulations with chiral effective field theory up to next-to-next-to-next-to-leading order. We discuss our investigation on the degree of locality of the short-range nucleon-nucleon interactions. We also discuss ground state energies of light and medium-mass nuclei as well as new algorithms for the proton and neutron density distributions and other properties. © Springer Nature Switzerland AG 2020.U.S. Department of Energy, USDOE: DE-SC0018638 Chinese Academy of Sciences, CAS: 2018DM0034 Deutsche Forschungsgemeinschaft, DFG: SFB/TR 110 116F400 Türkiye Bilimsel ve Teknolojik Araştirma Kurumu, TÜBITAK Volkswagen Foundation: 93562Fig. 94.8 PRELIMINARY RESULTS: Lattice results for ground state energies of light and medium-mass nuclei up to N3LO in chiral effective field theory without the three-body forces Acknowledgements The author is grateful to his collaborators, Jose Manuel Alarcón, Dechuan Du, Evgeny Epelbaum, Nico Klein, Hermann Krebs, Timo A. Lähde, Dean Lee, Ning Li, Bing-nan Lu, Thomas Luu, Ulf-G. Meißner, Gautam Rupak, and Alexander Rokash, for their contributions to the work presented in this proceedings. We acknowledge partial financial support from the Deutsche Forschungsgemeinschaft (SFB/TR 110, “Symmetries and the Emergence of Structure in QCD”), the U.S. Department of Energy (DE-SC0018638), and the Scientific and Technological Research Council of Turkey (TUBITAK project no. 116F400). Further support was provided by the Chinese Academy of Sciences (CAS) Presidents International Fellowship Initiative (PIFI) (Grant No. 2018DM0034) and by VolkswagenStiftung (Grant No. 93562). The computational resources were provided by the Julich Supercomputing Centre at Forschungszentrum Julich, Oak Ridge Leadership Computing Facility, RWTH Aachen, North Carolina State University, and Michigan State University
Differential Cross Sections and Analyzing Powers of the Three-Body Break-Up Channel in Deuteron-Deuteron Scattering at 65 MeV/nucleon
No full textIn this contribution, the results for the differential cross sections and a rich set of vector and tensor analyzing powers are presented for various configurations of the three-body break-up channel of (formula presented). The data were obtained at KVI using a polarised deuteron beam with a beam energy of 65 MeV/nucleon and a liquid deuterium target in combination with a (formula presented) detection system carrying the name Big-Instrument for Nuclear-Polarization Analysis (BINA). This work extends the results from an earlier study reported in [1]. In particular, additional kinematical configurations and spin observables were analyzed and obtained.</p
- …
