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Nuclear Theory·nucl-th

Thursday·July 4, 2019

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 01

    [Submitted on 2 Jul 2019]

    Deuteron-alpha scattering: separable vs nonseparable Faddeev approach

    L. Hlophe🇺🇸 · Jin Lei🇺🇸 · Ch. Elster🇺🇸 · A. Nogga🇩🇪 · F.M. Nunes🇺🇸 · D. Jurčiukonis🇱🇹 · A. Deltuva🇱🇹

    {\bf Background} Deuteron induced reactions are widely used to probe nuclear structure and astrophysical information. Those (d,p) reactions may be viewed as three-body reactions and described with Faddeev techniques. {\bf Purpose} Faddeev-AGS equations in momentum space have a long tradition of utilizing separable interactions in order to arrive at sets of coupled integral equations in one variable. However, it needs to be demonstrated that observables calculated based on separable interactions agree exactly with those based on nonseparable forces. {\bf Methods} Momentum space AGS equations are solved with separable and nonseparable forces as coupled integral equations. {\bf Results} Deuteron-alpha scattering is calculated via momentum space AGS equations using the CD-Bonn neutron-proton force and a Woods-Saxon type neutron(proton)-He force, for which the Pauli-forbidden S-wave bound state is projected out. Elastic as well as breakup observables are calculated and compared to results in which the interactions in the two-body sub-systems are represented by separable interactions derived in the Ernst-Shakin-Thaler (EST) framework. {\bf Conclusions} We find that the calculations based on the separable representation of the interactions and the original interactions give results that are in excellent agreement. Specifically, integrated cross sections and angular distributions for elastic scattering agree within 1\%, which is well below typical experimental errors. In addition, the five-fold differential cross sections corresponding to breakup of the deuteron agree extremely well.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1907.01587 [pdf]
    PRC(2019)·12 citations
  2. 02

    [Submitted on 3 Jul 2019]

    Prediction of stable superheavy nuclei

    H.C. Manjunatha · L. Seenappa · K.N. Sridhar

    We have investigated most stable superheavy nuclei by studying the decay properties such as alpha decay, cluster decay and spontaneous fission. We have investigated nine stable nuclei in the island of stability which can be detected through fission are 318123(10.5ms), 319123(4.68{\mu}s), 317124(1.74x104 y), 318124(2.70x101 y), 319124(2.83x10-2 y), 320124(1.91x10-5 y), 319125(2.46x109 y), 320125(3.81x106 y) and 321125(3.99x103 y). Present work also investigates three stable superheavy nuclei which can be detected through alpha decay which are 318125(1.03x1012 y), 319126(5.77x1011 y) and 320126(3.99x1010 y). These nuclei will become most stable nuclei if they synthesized in the laboratory. The identified twelve stable nuclei is the evidence for the hypothesis of island of stability

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1907.01762 [pdf]
    0 citations
  3. 03

    [Submitted on 3 Jul 2019]

    Photo-absorption on deuteron contributed by d^*(2380) resonance

    Yubing Dong🇨🇳 · Pengnian Shen🇨🇳 · Zoneye Zhang🇨🇳

    In order to understand the possible physical nature of the newly observed resonance , we calculate the real photo-absorption cross section on deuteron contributed by the resonance by considering the electromagnetic transition amplitude of . In our interpretation, the is regarded as a compact six-quark system with mainly two components of and hidden-color clusters . We find that only the next-to-leading terms contribute the and the obtained photo-absorption cross section is quite small which is in the order of 10 . Compared with data measured at ELPH and Mainz recently, it is almost about 20 times smaller.

    Comments:
    14pages, 2figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1907.01763 [pdf]
    Int.J.Mod.Phys.A(2019)·8 citations
  4. 04

    [Submitted on 3 Jul 2019]

    Exact solutions of the relativistic Boltzmann equation in the relaxation time approximation

    Ewa Maksymiuk🇵🇱

    This Thesis concentrates on the analysis of coupled RTA (relaxation time approximation) kinetic equations for bosons and fermions. Bosons are treated as massless particles, while fermions have a finite mass. Using analytic and numerical methods we find exact solutions for such a mixture in the case of one-dimensional, boost-invariant expansion (for systems which are transversally homogeneous). In this way, several earlier results obtained for one-component systems and classical particles are generalized.

    Comments:
    83 pages, 21 figures, This PhD Thesis is mainly based on the following papers: arXiv:1711.03872 and arXiv:1710.07095
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1907.01782 [pdf]
    0 citations
  5. 05

    [Submitted on 3 Jul 2019]

    Introduction to Nuclear-Reaction Theory

    Pierre Capel

    These notes summarise the lectures I gave during the summer school "International Scientific Meeting on Nuclear Physics" at La Rábida in Spain in June 2018. They offer an introduction to nuclear-reaction theory, starting with the basics in quantum scattering theory followed by the main models used to describe breakup reactions: the Continuum Discretised Coupled Channel method (CDCC),the Time-Dependent approach (TD) and the eikonal approximation. These models are illustrated on the study of the exotic structure of halo nuclei.

    Comments:
    42 pages, 16 figures, contrib. Procs. of the International Scientific Meeting on Nuclear Physics [La Rábida (Spain) 18th-22th June 2018], submitted to Springer Proceedings in Physics
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1907.01836 [pdf]
    Springer Proc.Phys.(2019)·0 citations
  6. 06

    [Submitted on 3 Jul 2019]

    Modeling B as a B-n-n three-body system in the unitary limit

    Emiko Hiyama🇯🇵 · Rimantas Lazauskas🇫🇷 · F. Miguel Marqués🇫🇷 · Jaume Carbonell🇫🇷

    We present a model description of the bound B isotope in terms of a B-n-n three-body system where the two-body subsystems B-n and n-n are unbound (virtual) states close to the unitary limit. The B ground state is well described in terms of two-body potentials only, and two low-lying resonances are predicted. Their eventual link with the Efimov physics is discussed. This model can be naturally used to describe the recently discovered resonant states in B.

    Comments:
    Accepted as a Rapid Communication in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1907.01837 [pdf]
    PRC(2019)·29 citations

Affiliations

first authorsco-authorsvia INSPIRE