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Nuclear Theory·nucl-th

Thursday·October 17, 2019

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 01

    [Submitted on 15 Oct 2019]

    Three-Nucleon Force Effects in the FSI configuration of the d(n, nn)p Breakup Reaction

    Hiroyuki Kamada🇯🇵 · Henryk Witala🇵🇱 · Jacek Golak · Roman Skibinski🇵🇱

    We investigated three-nucleon (3N) force effects in the final state interaction (FSI) configuration of the d(n, nn)p breakup reaction at the incoming nucleon energy E n = 200 MeV. Although 3N force effects for the elastic nucleon-deuteron scattering cross section at comparable energies are located predominantly in the region of intermediate and backward angles, the corresponding 3N force effects for the integrated FSI configuration breakup cross section are found also at forward scattering angles.

    Comments:
    Submission to SciPost, 6 pages, 1 figure, Proceedins of the 24th European conference on few-body problems in physics (EFB24) at the University of Surrey, Guildford, United Kingdom, from 2 to 6 September 2019
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1910.07006 [pdf]
    SciPost Phys.Proc.(2020)·0 citations
  2. 02

    [Submitted on 15 Oct 2019]

    Jet quenching in the hadron gas: an exploratory study

    Philipp Dorau🇩🇪 · Jean-Bernard Rose🇩🇪 · Daniel Pablos🇳🇴 · Hannah Elfner🇩🇪

    The suppression of high momentum particles in heavy-ion collisions in comparison to elementary reactions is one of the main indications for the formation of a quark-gluon plasma. In recent studies, full jets are being reconstructed and substructure observables are gaining importance in assessing the medium modifications of hard probes. In this work, the effect of the late stage hadronic interactions are explored within the hadronic transport approach SMASH (Simulating Many Accelerated Strongly-interacting Hadrons). High momentum particles are incorporated in a radially expanding hadron gas to analyse the corresponding angular distributions, also refered to as `jet shape' observables. We find that the full hadron gas can be approximated with a pion gas with constant elastic cross-sections of 100 mb. In addition, the temperature and probe energy dependence of diffusion coefficients and quantifying the transverse and parallel momentum transfers are extracted. The species dependence and the importance of different interaction types are investigated. Parametrizations are presented that can be employed in future jet quenching calculations to include the effect of the hadronic phase.

    Comments:
    8 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1910.07027 [pdf]
    PRC(2020)·28 citations
  3. 03

    [Submitted on 15 Oct 2019]

    Investigation of the energy levels and the structure of the different states of the 24Mg nucleus

    Sahar Aslanzadeh · Mohammad Reza Shojaei · Ali Asghar Mowlavi

    In this work, the 24Mg nucleus is considered in the cluster model by solving the Schrodinger and Klein- Gordon equations from the Nikiforov- Uvarov (NU) method. A local potential is used for these two equations that is compatible with the Hafstad-Teller potential. By substituting this potential in the Schrodinger and Klein- Gordon equations, the energy levels and wave functions are obtained from NU method. We obtain a first order equation in terms of E for the Schrodinger equation and a fourth-order equation in terms of ER for the Klein-Gordon equation. Therefore, the obtained equation from the Klein-Gordon equation has both the real solutions and imaginary solutions that we consider only the real solutions for this equation. For more accuracy, the spin-orbit and tensor potentials are added to the central potential as the perturbed terms and the first-order correction value of the energy levels is calculated. These energy levels are used for 24Mg nucleus and the good results are obtained in agreement with the experimental data. Of course, one can see that the calculated results from the Schrodinger and Klein-Gordon equations, i.e. non-relativistic and relativistic respectively, are nearly the same. By using the Coulomb repulsive potential, it is shown that the structure of the ground state and the first excited state of this nucleus is as octahedral and the configuration of the alpha particles for the second excited state is as pentahedral, i.e. as 12C +12C . Finally, we obtain the critical point for the calculation of maximum energy of this nucleus in the cluster model.

    Comments:
    11 page , one Table
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1910.07044 [pdf]
    Can.J.Phys.(2020)·2 citations
  4. 04

    [Submitted on 16 Oct 2019]

    -mass dependence of the M-matrix in the calculation of cross sections

    Ying Cui🇨🇳 · Yingxun Zhang🇨🇳 · Zhuxia Li🇨🇳

    Within the one boson exchange model, -mass dependent M-matrix and its influence on the calculation of cross sections are investigated. Our calculations show that the dependence of and has effects on the calculations of , especially around the threshold energy. We finally provide a table of accurate which can be used in the transport models.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1910.07232 [pdf]
    CPC(2020)·8 citations
  5. 05

    [Submitted on 16 Oct 2019]

    Deeply virtual Compton Scattering off He

    Sara Fucini🇮🇹 · Sergio Scopetta🇮🇹 · Michele Viviani🇮🇹

    Deeply virtual Compton scattering is a fascinating process which can provide a tomographic view of nuclei and bound nucleons. The first experimental results for He targets, recently released at Jefferson Lab, have been analyzed here in a rigorous Impulse Approximation scenario. For both the coherent and incoherent channels of the process, the main experimental observables have been written in terms of state-of-the-art models of the nuclear spectral function and of the parton structure of the bound proton. A good overall agreement with the data is obtained. The calculation shows that a comparison of our conventional results with future precise data can expose novel quark and gluon effects in nuclei.

    Comments:
    6 pages, 5 figures, submitted to the Conference Proceedings of the 27th International Nuclear Physics Conference, 29 July -2 August 2019, Glasgow (UK)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1910.07458 [pdf]
    J.Phys.Conf.Ser.(2020)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE