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Nuclear Theory·nucl-th

Wednesday·November 4, 2015

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    [Submitted on 2 Nov 2015]

    Folding model calculations for 6He+12C Elastic Scattering

    Awad A. Ibraheem

    In the framework of the double folding model, we used the {\alpha}+2n and di-triton configurations for the nuclear matter density of the 6He nucleus to generate the real part of the optical potential for the system 6He+12C. As an alternative, we also use the high energy approximation to generate the optical potential for the same system. The derived potentials are employed to analyze the elastic scattering differential cross section at energies of 38.3, 41.6 and 82.3 MeV/nucleon. For the imaginary part of the potential we adopt the squared Woods-Saxon form. The obtained results are compared with the corresponding measured data as well as with available results in literature. The calculated total reaction cross sections are investigated and compared with the optical limit Glauber model description.

    Comments:
    Submitted to "Chinese Physics C"
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1511.00732 [pdf]
    CPC(2016)·6 citations
  2. 02

    [Submitted on 2 Nov 2015]

    Induced Fission of Pu within a Real-Time Microscopic Framework

    Aurel Bulgac · Piotr Magierski · Kenneth J. Roche · Ionel Stetcu

    We describe the fissioning dynamics of Pu240 from a configuration in the proximity of the outer fission barrier to full scission and the formation of the fragments within an implementation of density functional theory extended to superfluid systems and real-time dynamics. The fission fragments emerge with properties similar to those determined experimentally, while the fission dynamics appears to be quite complex, with many excited shape and pairing modes. The evolution is found to be much slower than previously expected, and the ultimate role of the collective inertia is found to be negligible in this fully nonadiabatic treatment of nuclear dynamics, where all collective degrees of freedom (CDOF) are included (unlike adiabatic treatments with a small number of CDOF).

    Comments:
    updated version in agreement with published paper, updated and new references, 7 pages, additional material at http://faculty.washington.edu/bulgac/Pu240/
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1511.00738 [pdf]
    PRL(2016)·229 citations
  3. 03

    [Submitted on 3 Nov 2015]

    Open -shell nuclei from first principles

    G. R. Jansen · M. D. Schuster · A. Signoracci · G. Hagen · P. Navrátil

    We extend the ab initio coupled-cluster effective interaction (CCEI) method to deformed open-shell nuclei with protons and neutrons in the valence space, and compute binding energies and excited states of isotopes of neon and magnesium. We employ a nucleon-nucleon and three-nucleon interaction from chiral effective field theory evolved to a lower cutoff via a similarity renormalization group transformation. We find good agreement with experiment for binding energies and spectra, while charge radii of neon isotopes are underestimated. For the deformed nuclei Ne and Mg we reproduce rotational bands and electric quadrupole transitions within uncertainties estimated from an effective field theory for deformed nuclei, thereby demonstrating that collective phenomena in -shell nuclei emerge from complex ab initio calculations.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1511.00757 [pdf]
    PRC(2016)·81 citations
  4. 04

    [Submitted on 2 Nov 2015] (cross-list from hep-th)

    Vibrational quantisation of the B=7 Skyrmion

    C. J. Halcrow🇬🇧

    We consider the inclusion of the most important vibrational modes in the quantisation of the dodecahedral Skyrmion. In contrast to a rigid body quantisation, this formalism allows a spin state to lie below the spin state, in agreement with experimental data. There is also a low lying spin state and two spin states. We find that the excited spin state has a smaller root mean square charge radius than the other states. This prediction is an important signature of the Skyrme model, in conflict with more conventional nuclear models.

    Comments:
    24 pages, 6 figures
    Subjects:
    High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1511.00682 [pdf]
    NPB(2016)·61 citations
  5. 05

    [Submitted on 3 Nov 2015] (cross-list from hep-ph)

    Compositeness of Hadrons and Near-Threshold Dynamics

    Tetsuo Hyodo🇯🇵

    We present the recent developments in the studies of the structure of hadron resonances, focusing on the compositeness in terms of the hadronic degrees of freedom. We discuss the model dependence of the compositeness, and show that the structure of the near-threshold bound states and resonances is model-independently determined. The applications to various hadrons are summarized.

    Comments:
    9 pages, talk given at The 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015) May 25-28, 2015, Osaka, Japan, to appear in JPS Conf. Proc
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1511.00870 [pdf]
    JPS Conf.Proc.(2016)·1 citation
  6. 06

    [Submitted on 3 Nov 2015] (cross-list from astro-ph.HE)

    Chiral transport of neutrinos in supernovae: Neutrino-induced fluid helicity and helical plasma instability

    Naoki Yamamoto🇯🇵

    Chirality of neutrinos modifies the conventional kinetic theory and hydrodynamics, leading to unusual chiral transport related to quantum anomalies in field theory. We argue that these corrections have new phenomenological consequences for hot and dense neutrino gases, especially in core-collapse supernovae. We find that the neutrino density can be converted to the fluid helicity through the chiral vortical effect. This fluid helicity effectively acts as a chiral chemical potential for electrons via the momentum exchange with neutrinos and induces a "helical plasma instability" that generates a strong helical magnetic field. This provides a new mechanism for converting the gravitational energy released by the core collapse to the electromagnetic energy and potentially explains the origin of magnetars. The other possible applications of the neutrino chiral transport theory are also discussed.

    Comments:
    13 pages, 3 figures; v2: published version; v3: error in Eq. (38) corrected
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1511.00933 [pdf]
    PRD(2016)·124 citations

Affiliations

first authorsco-authorsvia INSPIRE