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Nuclear Theory·nucl-th

Tuesday·July 12, 2022

13 papers—6 primary·7 cross-listed

All13Primary6Cross-lists7
  1. 01

    Critical lensing and kurtosis near a critical point in the QCD phase diagram in and out-of-equilibrium

    Travis Dore🇺🇸 · Jamie M. Karthein🇺🇸 · Isaac Long🇺🇸 · Debora Mroczek🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸 · Paolo Parotto🇺🇸 · Claudia Ratti🇺🇸 · Yukari Yamauchi🇺🇸

    In this work, we study the lensing effect of the QCD critical point on hydrodynamic trajectories, and its consequences on the net-proton kurtosis . Including critical behavior by means of the BEST Collaboration equation of state (EoS), we first consider a scenario in equilibrium, then compare with hydrodynamic 0+1D simulations with Bjorken expansion, including both shear and bulk viscous terms. We find that, both in and out-of-equilibrium, the size and shape of the critical region directly affect if the signal will survive through the dynamical evolution.

    nucl-thhep-exhep-phPRD(2022)·43 citations
  2. 02

    Renormalization of proton-proton fusion in chiral effective field theory

    Tai-Xing Liu🇨🇳 · Rui Peng🇨🇳 · Songlin Lyu🇨🇳 · Bingwei Long🇨🇳

    Renormalization of proton-proton fusion is studied in the framework of chiral effective field theory. Strict perturbative treatment of subleading corrections is applied in the analysis. Possible enhancement of two-nucleon contact axial current operators is the focus of the study. We find evidence that supports a previous proposal in the literature to promote one of the contact axial current operators.

    nucl-thPRC(2022)·7 citations
  3. 03

    Measuring differential flow angle fluctuations in relativistic nuclear collisions

    Niseem Magdy🇺🇸

    Recently studies of the differential nature of the flow angle fluctuations, known as event plane angular decorrelation, indicated that measurements that assume a common symmetry plane may need to consider the flow angle fluctuations effect. Using the HIJING and AMPT models, it is shown that the flow angle fluctuations measurements, obtained with the two- and three-subevents correlation method, could have significant non-flow effects associated with long- and short-range non-flow correlations. The current study demonstrates the four-subevents cumulant methods' ability to reduce the non-flow effects. It is further argued that the measurements using the four-subevents correlation method can be used to provide accurate quantification of the differential flow angle fluctuations.

    nucl-thhep-exhep-phnucl-exPRC(2022)·10 citations
  4. 04

    H ground state as a H+4n resonance

    Emiko Hiyama🇯🇵 · Rimantas Lazauskas🇫🇷 · Jaume Carbonell🇫🇷

    We have investigated the possible existence of a H resonant state, considered as a five-body system consisting of a H core with four valence neutrons. To this aim, an effective n-H potential is constructed in order to reproduce the low energy elastic neutron scattering on H phase shifts and the H resonant ground state in terms of H-n-n system. The variational Gaussian Expansion Method is used to solve the 5-body Schrödinger equation, while the resonant state parameters were estimated by means of the stabilization method. We have not found any sign of a narrow low energy resonance in the vicinity of H+4n threshold. However, we have identified a very broad structure at MeV above this threshold, which corresponds to the H J=1/2 ground state. In the vicinity of this state, we have also identified a broad structure corresponding to the ground state of H isotope with quantum numbers .

    nucl-thhep-phnucl-exPLB(2022)·7 citations
  5. 05

    Nuclear fission and fusion in a random-walk model

    M. Albertsson🇸🇪

    This dissertation deals with theoretical descriptions of nuclear fission and synthesis of superheavy elements via fusion. The associated shape evolutions are treated using a random-walk approach where both the potential energy and the nuclear level density influence the dynamics. The work in this thesis extends the random-walk model by, in addition to the previous description of fragment mass yields, also simulating how much kinetic energy the fission-fragments obtain and the number of neutrons they emit, as well as how these two quantities are correlated. The thesis also presents studies of how different ways of fissioning, called fission modes, are present in different nuclei and how the presence of these modes depends on the energy of the system. The model is furthermore applied to the description of the shape evolution in fusion for production of superheavy elements.

    nucl-th1 citation
  6. 06

    Splitting of proton-antiproton directed flow in relativistic heavy-ion collisions

    Piotr Bozek🇵🇱

    The rapidity dependent directed flow of particles produced in a relativistic heavy ion collision can be generated in the hydrodynamic expansion of a tilted source. The asymmetry of the pressure leads to a build up of a directed flow of matter with respect to the collision axis. The experimentally observed ordering of the directed flow of baryons, pions and antibaryons can be described as resulting from the expansion of a baryon inhomogeneous fireball. An uneven distribution of baryons in the transverse plane leads to an asymmetry in the collective push for protons and antiprotons. Precise measurements of the collective flow as a function of rapidity could serve as a strong constraint on mechanism of baryon stopping in the early phase of the collision.

    nucl-thhep-phnucl-exPRC(2022)·31 citations

Affiliations

first authorsco-authorsvia INSPIRE