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Nuclear Theory·nucl-th

Monday·December 24, 2018

12 papers—5 primary·7 cross-listed

All12Primary5Cross-lists7
  1. 01

    [Submitted on 21 Dec 2018]

    The effect of the neutron and proton numbers ratio in colliding nuclei at formation of the evaporation residues in the S+Pb and S+Pb reactions

    A.K. Nasirov (1,2) · B.M. Kayumov (2) · G. Mandaglio (3,4) · G. Giardina (5) · K. Kim (6) · Y. Kim (6)((1) BLTP, Joint Institute for Nuclear Research, Dubna, Russia, (2) Institute of Nuclear Physics, Ulugbek, Tashkent, Uzbekistan,(3) Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, University of Messina, Messina, Italy, (4) INFN Sezione di Catania, Catania, Italy, (5) Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, University of Messina, Messina, Italy, (6) Rare Isotope Science Project, Institute for Basic Science, Daejeon, Republic of Korea)

    The difference between observed cross sections of the evaporation residues (ER) of the S+Pb and S+Pb reactions formed in the 2n and 3n channels has been explained by two reasons related with the entrance channel characteristics of these reactions. The first reason is that the capture cross section of the latter reaction is larger than the one of the S+Pb reaction since the nucleus-nucleus potential is more attractive in the S+Pb reaction due to two more neutrons in isotope S. The second reason is the difference in the heights of the intrinsic fusion barrier appearing on the fusion trajectory by nucleon transfer between nuclei of the DNS formed after the capture. The value of calculated for the S+Pb reaction is higher than the one obtained for the S+Pb reaction. This fact has been caused by the difference between the -ratios in the light fragments of the DNS formed during the capture in these reactions. The -ratio has been found by solution of the transport master equations for the proton and neutron distributions between fragments of the DNS formed at capture with the different initial neutron numbers and for the reactions with the S and S, respectively.

    Comments:
    22 pages, 13 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1812.08906 [pdf]
    EPJA(2019)·18 citations
  2. 02

    [Submitted on 21 Dec 2018]

    Possible non-prompt photons in collisions and their effects in analyses

    Akihiko Monnai🇯🇵

    Direct photons are a powerful tool for elucidating the properties of the hot QCD matter in heavy-ion collisions. They are conventionally estimated by assuming prompt photon contributions in proton-proton collisions and thermal and prompt photon contributions in heavy-ion collisions. On the other hand, there could also be other sources of photons such as pre-equilibrium photons. I investigate prompt, pre-equilibrium and thermal photons and their effects on the direct photon spectra at CERN Large Hadron Collider energies.

    Comments:
    4 pages, 2 figures - To appear in the conference proceedings for Hard Probes 2018, September 30-October 5, Aix-Les-Bains, France
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1812.08987 [pdf]
    PoS(2019)·8 citations
  3. 03

    [Submitted on 21 Dec 2018]

    Structure of resonances in a simple quantum-mechanical model

    Peter C. Bruns

    We study the structure of resonances derived from the solution of an exactly solvable Lippmann-Schwinger equation. Within this framework, we discuss the concept of "resonance form factors", and the description of the resonant amplitudes in terms of effective energy-dependent potentials.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1812.09003 [pdf]
    1 citation
  4. 04

    [Submitted on 21 Dec 2018]

    Neutron transfer reactions in halo effective field theory

    M. Schmidt · L. Platter · H.-W. Hammer

    Direct reaction experiments provide a powerful tool to probe the structure of neutron-rich nuclei like beryllium-11. We use halo effective field theory to calculate the cross section of the deuteron-induced neutron transfer reaction . The effective theory contains dynamical fields for the beryllium-10 core, the neutron, and the proton. In contrast, the deuteron and the beryllium-11 halo nucleus are generated dynamically from contact interactions using experimental and ab initio input. The reaction amplitude is constructed up to next-to-leading order in an expansion in the ratio of the length scales characterizing the core and the halo. The Coulomb repulsion between core and proton is treated perturbatively. Finally, we compare our results to cross-section data and other calculations.

    Comments:
    30 pages, 20 figures, published version with further details and minor typographic changes
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1812.09152 [pdf]
    PRC(2019)·7 citations
  5. 05

    [Submitted on 21 Dec 2018]

    Energy dependence of fission-fragment neutron multiplicity in

    M. Albertsson🇸🇪

    A consistent framework for treating the energy dependence of fission-fragment neutron multiplicities is presented. The shape evolution of the compound nucleus towards scission is treated in the strong damping limit using the Metropolis walk method. The available excitation energy at scission is then divided statistically between the two fragments using microscopic level densities. Deformation energies, which contribute to the excitation energy when the fragments relax to their ground-state shapes, are also computed. From the total fragment excitation energies, the number of emitted neutrons is obtained and illustrated for neutron-induced fission of .

    Comments:
    8 pages, 4 figures, Proceeding of the XXV Nuclear Physics Workshop, Kazimierz, Poland, 2018; minor typos corrected
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1812.09208 [pdf]
    Acta Phys.Polon.Supp.(2019)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE