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Nuclear Theory·nucl-th

Thursday·July 11, 2019

9 papers—5 primary·4 cross-listed

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  1. 01

    [Submitted on 10 Jul 2019]

    Allowed -decay spectrum with numerical electron wave functions

    Dong-Liang Fang🇨🇳

    Using numerical electron wave functions and state-of-the-art nuclear many-body methods, I evaluate the -decay spectra for typical decay channels of spherical nuclei. I check errors brought by various approximations used for deriving the analytical shape factors (the so-called Fermi Function) of allowed decay. I estimate the errors brought by different electric charge distributions and give a way of estimation of -spectra with available decay data of specific nuclei. I found that the traditional ways of approximating the electron wave functions by Fermi Function could be a very severe source of error for spectra simulation.

    Comments:
    10 pages, 4 figures, comments and suggestions are welcome
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1907.04560 [pdf]
    3 citations
  2. 02

    [Submitted on 10 Jul 2019]

    First, second, third and fourth flow harmonics of deuterons and protons in Au+Au reactions at 1.23 A GeV

    Paula Hillmann🇩🇪 · Jan Steinheimer🇩🇪 · Tom Reichert🇩🇪 · Vincent Gaebel🇩🇪 · Marcus Bleicher🇩🇪 · Sukanya Sombun🇹🇭 · Christoph Herold🇹🇭 · Ayut Limphirat🇹🇭

    We explore the directed, elliptic, triangular and quadrangular flow of deuterons in Au+Au reactions at a beam energy of 1.23 AGeV within the UrQMD approach. These investigations are of direct relevance for the HADES experiment at GSI that has recently presented first data on the flow of light clusters in Au+Au collisions at 1.23 AGeV. To address the deuteron flow, UrQMD has been extended to include deuteron formation by coalescence. We find that this ansatz provides a very good description of the measured deuteron flow data, if a hard equation of state is used for the simulation. In addition we show that light cluster formation has a sizable impact on the proton flow and has to be taken into account to obtain reliable results in the forward/backward region. Based on the observed scaling of the flow, which is a natural result of coalescence, we conclude that deuteron production at GSI energies is a final state recombination effect. Finally, we also discuss the scaling relations of the higher order flow components up to . We show that and as function of transverse momentum and that the integrated over the investigated energy range from =0.1 AGeV to 40 AGeV.

    Comments:
    10 pages, 18 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1907.04571 [pdf]
    J.Phys.G(2020)·54 citations
  3. 03

    [Submitted on 10 Jul 2019]

    Microscopic studies of production cross sections in multinucleon transfer reaction Ni+Sn

    Zhenji Wu · Lu Guo

    \item[Background] Multinucleon transfer reaction at low-energy collisions is considered to be a promising method for the production of new exotic nuclei, which are difficult to be produced by other methods. The theoretical studies are required to provide reliable predictions for the experiments and promote the understanding of the microscopic mechanism in multinucleon transfer reactions. \item[Purpose] We provide a predictive approach for production cross sections, and testify how and to what extent the microscopic approach works well in multinucleon transfer reaction. \item[Methods] We employ the approach TDHF+GEMINI, which combines the microscopic time-dependent Hartree-Fock (TDHF) with the state-of-art statistical model GEMINI++, to take into account both the multinucleon transfer dynamics and the secondary deexcitation process. The properties of primary products in multinucleon transfer process, such as transfer probabilities and primary cross sections, are extracted from TDHF dynamics by using the particle-number projection method. Production cross sections for secondary products are evaluated by using the statistical model GEMINI++. \item[Results] We investigate the influence of colliding energies and deformation orientations of target and projectile nuclei on multinucleon transfer dynamics in the reaction Ni+Sn...... \item[Conclusions] The microscopic approach TDHF+GEMINI reasonably reproduces the experimental data at energies close to the Coulomb barrier and well accounts for the multinucleon transfer mechanism. The present studies clearly reveal the applicability of TDHF+GEMINI method in multinucleon transfer reactions, which thus deserves as a promising tool to predict the properties of new reactions.

    Comments:
    accepted for publication in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1907.04581 [pdf]
    PRC(2019)·73 citations
  4. 04

    [Submitted on 10 Jul 2019]

    Effect of Octupole correlations on Fission of Light Nuclei

    Guillaume Scamps · Cédric Simenel

    Fission of Hg produces mass asymmetric fragments which are expected to be influenced by deformed shell-effects at N=56 in the heavy fragment and Z=34 in the light fragment [G. Scamps and C. Simenel, arXiv:1904.01275 (2019)]. To investigate both shell-effects and to determine which one has the main influence on the asymmetry in the region of the Hg, we produce a systematic of Constraint-Hartree-Fock calculations in nuclei with similar N/Z ratio than the Pt. It is found that N=56 determines the asymmetry of systems in this region of the nuclear chart.

    Comments:
    5 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1907.04633 [pdf]
    JPS Conf.Proc.(2020)·0 citations
  5. 05

    [Submitted on 10 Jul 2019]

    Coulomb Energy Density Functionals for Nuclear Systems: Recent Studies of Coulomb Exchange and Correlation Functionals

    Tomoya Naito · Ryosuke Akashi · Gianluca Colò · Haozhao Liang · Xavier Roca-Maza

    The Coulomb exchange and correlation energy density functionals for electron systems are applied to nuclear systems. It is found that the exchange functionals in the generalized gradient approximation provide agreements with the exact-Fock energy with one adjustable parameter within a few dozen accuracy, whereas the correlation functionals are not directly applicable to nuclear systems due to the existence of the nuclear force.

    Comments:
    The IV International Conference on Nuclear Structure and Dynamics (NSD2019)
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1907.04772 [pdf]
    EPJ Web Conf.(2019)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE