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Nuclear Theory·nucl-th

Friday·June 9, 2017

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 01

    [Submitted on 7 Jun 2017]

    Analytic predictions for nuclear shapes, the prolate dominance and the prolate-oblate shape transition in the proxy-SU(3) model

    Dennis Bonatsos · I. E. Assimakis · N. Minkov · Andriana Martinou · S. Sarantopoulou · R. B. Cakirli · R. F. Casten · K. Blaum

    Using a new approximate analytic parameter-free proxy-SU(3) scheme, we make simple predictions of shape observables for deformed nuclei, namely gamma and beta deformation variables, the global feature of prolate dominance and the locus of the prolate-oblate shape transition. The predictions are compared with empirical results.

    Comments:
    14 pages, 6 figures, 4 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1706.02321 [pdf]
    PRC(2017)·113 citations
  2. 02

    [Submitted on 8 Jun 2017]

    On the properties of the Th isotope

    V.I. Isakov

    Electromagnetic properties of the deformed neutron-odd nucleus Th are investigated in the framework of the unified model, with primary emphasis upon the properties of the low-lying isomeric state.

    Comments:
    10 pages, one figure
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1706.02517 [pdf]
    0 citations
  3. 03

    [Submitted on 8 Jun 2017]

    Shell model based deformation analysis of light Cadmium isotopes

    T. Schmidt · K. L. G. Heyde · A. Blazhev · J. Jolie

    Large-scale shell-model calculations for the even-even Cadmium isotopes 98 Cd - 108 Cd have been performed with the ANTOINE code in the {\pi}(2p 1/2 ; 1g 9/2 ) {\nu}(2d 5/2 ; 3s 1/2 ; 2d 3/2 ; 1g 7/2 ; 1h 11/2 ) model space without further truncation. Known experimental energy levels and B(E2) values could be well reproduced. Taking these calculations as a starting ground we analyze the deformation parameters predicted for the Cd isotopes as a function of neutron number N and spin J using the methods of model independent invariants introduced by K. Kumar and D. Cline.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1706.02544 [pdf]
    PRC(2017)·34 citations
  4. 04

    [Submitted on 8 Jun 2017]

    Three--Dimensional parton structure of light nuclei

    Sergio Scopetta🇮🇹 · Alessio Del Dotto🇮🇹 · Leonid Kaptari🇷🇺 · Emanuele Pace🇮🇹 · Matteo Rinaldi🇪🇸 · Giovanni Salmè🇮🇹

    Two promising directions beyond inclusive deep inelastic scattering experiments, aimed at unveiling the three dimensional structure of the bound nucleon, are reviewed, considering in particular the He nucleus. The 3D structure in coordinate space can be accessed through deep exclusive processes, whose non-perturbative part is encoded in generalized parton distributions (GPDs). In this way, the distribution of partons in the transverse plane can be obtained. As an example, coherent deeply virtual Compton scattering (DVCS) off He nuclei, important to access the neutron GPDs, will be discussed. In Impulse Approximation (IA), the sum of two GPDs of He, and , at low momentum transfer, turns out to be dominated by the neutron contribution. Besides, a technique, able to take into account the nuclear effects included in the Impulse Approximation analysis, has been developed. The spin dependent GPD of He is also found to be largely dominated, at low momentum transfer, by the neutron contribution. Semi-inclusive deep inelastic scattering processes access the momentum space 3D structure parameterized through transverse momentum dependent parton distributions. A distorted spin-dependent spectral function has been recently introduced for He, in a non-relativistic framework, to take care of the final state interaction between the observed pion and the remnant in semi-inclusive deep inelastic electron scattering off transversely polarized He. The calculation of the Sivers and Collins single spin asymmetries for He, and a straightforward procedure to effectively take into account nuclear dynamics and final state interactions, will be reviewed. The Light-front dynamics generalization of the analysis is also addressed.

    Comments:
    10 pages, 5 figures, invited talk at the "15th Conference on Theoretical Nuclear Physics in Italy (TNPI16)", Pisa, Italy, 20-22 April 2016. To appear in the Proceedings
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1706.02626 [pdf]
    J.Phys.Conf.Ser.(2018)·0 citations
  5. 05

    [Submitted on 8 Jun 2017]

    Charge and Magnetic Properties of Three-Nucleon Systems in Pionless Effective Field Theory

    Jared Vanasse

    A method to calculate the form factor for an external current with non-derivative coupling for the three-body system in an effective field theory (EFT) of short-range interactions is shown. Using this method the point charge radius of is calculated to next-to-next-to-leading order (NNLO) in pionless EFT (), and the magnetic moment and magnetic radius of and are calculated to next-to-leading order (NLO). For the charge and magnetic form factors Coulomb interactions are ignored. The point charge radius is given by 1.74(4) fm at NNLO. This agrees well with the experimental point charge radius of 1.7753(54) fm [Angeli and Marinova, At. Data Nucl. Data Tables 99, 69 (2013)]. The () magnetic moment in units of nuclear magnetons is found to be 2.92(35) (-2.08(25)) at NLO in agreement with the experimental value of 2.979 (-2.127). For () the NLO magnetic radius is 1.78(11) fm (1.85(11) fm) which agrees with the experimental value of 1.840(182) fm (1.965(154) fm) [I. Sick, Prog. Part. Nucl. Phys. 47, 245 (2001)]. The fitting of the low-energy constant of the isovector two-body magnetic current and the consequences of Wigner-SU(4) symmetry for the three-nucleon magnetic moments are also discussed.

    Comments:
    v1: 38 pages 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1706.02665 [pdf]
    PRC(2018)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE