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Nuclear Theory·nucl-th

Thursday·October 15, 2020

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 01

    Fission Dynamics of Compound Nuclei: Pairing versus Fluctuations

    Yu Qiang · Junchen Pei · Paul Stevenson

    Energy dependence of fission observables is a key issue for wide nuclear applications. We studied real-time fission dynamics from low-energy to high excitations in the compound nucleus Pu with the time-dependent Hartree-Fock+BCS approach. It is shown that the evolution time of the later phase of fission towards scission is considerably lengthened at finite temperature. As the role of dynamical pairing is vanishing at high excitations, the random transition between single-particle levels around the Fermi surface to mimic thermal fluctuations is indispensable to drive fission. The obtained fission yields and total kinetic energies with fluctuations can be divided into two asymmetric scission channels, namely S1 and S2, which explain well experimental results, and give microscopic support to the Brosa model. With increasing fluctuations, S2 channel takes over S1 channel and the spreading fission observables are obtained.

    nucl-thPRC(2021)·35 citations
  2. 02

    interaction in leading order covariant chiral effective field theory

    Jing Song🇨🇳 · Yang Xiao🇨🇳 · Zhi-Wei Liu🇨🇳 · Chun-Xuan Wang🇨🇳 · Kai-Wen Li🇨🇳 · Li-Sheng Geng🇨🇳

    We study the interaction in the covariant chiral effective field theory (ChEFT) at leading order. All the relevant low-energy constants are determined by fitting to the lattice QCD simulations from the HAL QCD Collaboration. Extrapolating the results to the physical point, we show that the interaction is weakly attractive in the channel, but in the channel, it is only attractive at extremely low energies and soon turns repulsive for larger laboratory energy. Furthermore, we show that the neglect of the coupling provided by the leading order covariant ChEFT would result in an attractive interaction in the channel at the physical point, which coincides with the previous non-relatistic ChEFT study. As a byproduct, we predict the phase shifts and the mixing angel , which can be checked by future lattice QCD simulations. In addition, we compare the interaction with the and interactions to study how the baryon-nucleon () interactions evolve as a function of the baryon mass with the replacement of a light quark by a strange or charm quark in the baryon ().

    nucl-thhep-phPRC(2020)·16 citations
  3. 03

    Hadrons and Few-Body Physics

    Jean-Marc Richard🇫🇷

    We present a selection of topics with an interplay of hadron and few-body physics. This includes few-nucleon systems, light hypernuclei and quark dynamics for baryons and multiquarks. It is stressed that standard quark models predict very few stable multiquarks.

    nucl-thhep-phFew Body Syst.(2020)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE