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Nuclear Theory·nucl-th

Thursday·April 18, 2019

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 01

    Systematic study of proton radioactivity based on Gamow--like model with a screened electrostatic barrier

    Jiu-Long Chen · Xiao-Hua Li · Jun-Hao Cheng · Jun-Gang Deng · Xi-Jun Wu

    In the present work we systematically study the half--lives of proton radioactivity for nuclei based on the Gamow--like model with a screened electrostatic barrier. In this model there are two parameters while considering the screened electrostatic effect of Coulomb potential with the Hulthen potential i.e. the effective nuclear radius parameter r_0 and the screening parameter a. The calculated results can well reproduce the experimental data. In addition, we extend this model to predict the proton radioactivity half--lives of 16 nuclei in the same region within a factor of 2.94, whose proton radioactivity are energetically allowed or observed but not yet quantified. Meanwhile, studying on the proton radioactivity half-life by a type of universal decay law has been done. The results indicate that the calculated half--lives are linearly dependent on Coulomb parameter with the same orbital angular momentum.

    nucl-thnucl-exJ.Phys.G(2019)·24 citations
  2. 02

    Initial conditions of bulk matter in ultrarelativistic nuclear collisions

    J. Scott Moreland🇺🇸

    Dynamical models based on relativistic fluid dynamics provide a powerful tool to extract the properties of the strongly-coupled quark-gluon plasma (QGP) produced by ultrarelativistic nuclear collisions. The largest source of uncertainty in these model-to-data extractions is the choice of theoretical initial conditions (ICs) used to model the distribution of energy or entropy at the hydrodynamic starting time. Descriptions of the ICs are generally improved through iterative cycles of testing and refinement. Individual models are compared to experimental data; the worst models are discarded and best models retained. Consequently, successful traits (assumptions) are passed on to subsequent generations of the theoretical landscape. This bottom-up approach correspondingly describes a form of theoretical trial and error, where each trial proposes an ab initio solution to the problem at hand. A natural complement to this strategy, is to employ a top-down or data-driven approach which is able to reverse engineer properties of the ICs from the constraints imposed by the experimental data. In this dissertation, I motivate and develop a parametric IC model based on a family of functions known as the generalized means. The ansatz closely mimics the variability of ab initio calculations and serves as a reasonable parametric form for exploring QGP energy and entropy deposition assuming imperfect knowledge of the complex physical processes which lead to its creation. With the parametric model in hand, I explore broad implications of the proposed ansatz using recently adapted Bayesian methods to simultaneously constrain properties of the ICs and QGP medium using experimental data from the Large Hadron Collider. These analyses show that the ICs are highly constrained by available measurements and provide evidence of a unified hydrodynamic description of small and large nuclear collision systems.

    nucl-thnucl-ex9 citations
  3. 03

    Individual dipole toroidal states: main features and search in (e,e') reaction

    V.O. Nesterenko · A. Repko · J. Kvasil · P.-G. Reinhard

    Individual low-energy E1 toroidal and compressional states (TS and CS) produced by the convective nuclear current were recently predicted for Mg in the framework of quasiparticle random-phase-approximation (QRPA) with Skyrme forces. In the present QRPA study with Skyrme parametrization SLy6, we explore in more detail properties of these states (toroidal and compressional responses, current distributions, and transitions probabilities , with 0 and 1) and analyze the possibility to discriminate and identify TS in inelastic electron scattering to back angles. The interplay of the convective and magnetization nuclear currents is thoroughly scrutinized. A two-step scheme for identification of TS in reaction is proposed. The key element of the scheme is the strong interference of the orbital and spin contributions, resulting in specific features of E1 and M2 transversal form factors.

    nucl-thPRC(2019)·11 citations
  4. 04

    Hadron-Deuteron Correlations and Production of Light Nuclei in Relativistic Heavy-Ion Collisions

    Stanislaw Mrowczynski🇵🇱 · Patrycja Slon🇵🇱

    The production of light nuclei in relativistic heavy-ion collisions is well described by both the thermal model, where light nuclei are in equilibrium with all other hadron species present in a fireball, and by the coalescence model, where light nuclei are formed due to final state interactions after the fireball decays. A method is proposed to falsify one of the models. We suggest to measure a hadron-deuteron correlation function which carries information about the source of the deuterons and allows one to determine whether a deuteron is directly emitted from the fireball or if it is formed afterwards. The and correlation functions are computed to illustrate the statement.

    nucl-thhep-phnucl-exActa Phys.Polon.B(2020)·52 citations
  5. 05

    Interface effects of strange quark matter

    Cheng-Jun Xia🇨🇳

    The interface effects play important roles for the properties of strange quark matter (SQM) and the related physical processes. We show several examples on the implications of interface effects for both stable and unstable SQM. Based on an equivparticle model and adopting mean-field approximation (MFA), the surface tension and curvature term of SQM can be obtained, which are increasing monotonically with the density of SQM at zero external pressure. For a parameter set constrained according to the 2 strange star, we find the surface tension is 2.4 MeV/fm, while it is larger for other cases.

    nucl-thastro-ph.HEnucl-exAIP Conf.Proc.(2019)·6 citations

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first authorsco-authorsvia INSPIRE