PaperPanorama
FAQ

Nuclear Theory·nucl-th

Tuesday·May 12, 2015

13 papers—4 primary·9 cross-listed

All13Primary4Cross-lists9
  1. 01

    [Submitted on 9 May 2015]

    Nuclear energy release from fragmentation

    Cheng Li · S. R. Souza · M. B. Tsang · Feng-Shou Zhang

    Nuclear energy released by splitting Uranium and Thorium isotopes into two, three, four, up to eight fragments with nearly equal size are studied. We found that the energy released come from equally splitting the U and Th nuclei into to three fragments is largest. The statistical multifragmentation model is employed to calculate the probability of different breakup channels for the excited nuclei. Weighing the the probability distributions of fragments multiplicity at different excitation energies for the U nucleus, we found that an excitation energy between 1.2 and 2 MeV/u is optimal for the U, U, Th and Th nuclei to release nuclear energy of about 0.7-0.75 MeV/u.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1505.02239 [pdf]
    NPA(2016)·1 citation
  2. 02

    [Submitted on 10 May 2015]

    The virtual-state character of the {9}^Be 1/2^+ state in the {9}^Be({\gamma},n){8}^Be reaction

    Myagmarjav Odsuren · Yuma Kikuchi · Takayuki Myo · Masayuki Aikawa · Kiyoshi Kato

    We study the character of the first excited 1/2^{+} state of {9}^Be, which is observed as a low-lying sharp peak in the cross section of 9^Be({\gamma},n)2{\alpha} just above the {8}^Be+n threshold. Using the {\alpha}+{\alpha}+n three-body model, we describe the ground and excited unbound states of {9}^Be above the {\alpha}+{\alpha}+n threshold. Applying the complex scaling method to the three-body model, we find no 1/2^{+} resonant solutions, while the low-lying peak in the photodisintegration cross section is reproduced in the present calculation. It is found that the low-lying peak is dominantly explained by the 8^Be+n component. Furthermore, using the analytical continuation of the coupling constant of the three-body interaction for the {\alpha}+{\alpha}+n system, we discuss the virtual-state character of the 1/2^{+} state.

    Comments:
    5 pages
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1505.02353 [pdf]
    PRC(2015)·29 citations
  3. 03

    [Submitted on 11 May 2015]

    Few-body calculations of -nuclear quasibound states

    N. Barnea🇮🇱 · E. Friedman🇮🇱 · A. Gal🇮🇱

    We report on precise hyperspherical-basis calculations of and quasibound states, using energy dependent interaction potentials derived from coupled-channel models of the nucleon resonance. The attraction generated in these models is too weak to generate a two-body bound state. No bound-state solution was found in our calculations in models where Re fm, with the scattering length, covering thereby the majority of resonance models. A near-threshold bound-state solution, with separation energy of less than 1 MeV and width of about 15 MeV, was obtained in the 2005 Green-Wycech model where Re fm. The role of handling self consistently the subthreshold interaction is carefully studied.

    Comments:
    a second footnote added in v2, matching published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1505.02588 [pdf]
    PLB(2015)·33 citations
  4. 04

    [Submitted on 11 May 2015]

    Regularity and chaos in 0+ states of the interacting boson model using quantum measures

    S. Karampagia · Dennis Bonatsos · R. F. Casten

    Statistical measures of chaos have long been used in the study of chaotic dynamics in the framework of the interacting boson model. The use of large number of bosons renders additional studies of chaos possible, that can provide a direct comparison with similar classical studies of chaos. We intend to provide complete quantum chaotic dynamics at zero angular momentum in the vicinity of the arc of regularity and link the results of the study of chaos using statistical measures with those of the study of chaos using classical measures. Statistical measures of chaos are applied on the spectrum and the transition intensities of 0+ states in the framework of the interacting boson model. The energy dependence of chaos is provided for the first time using statistical measures of chaos. The position of the arc of regularity was also found to be stable in the limit of large boson numbers. The results of the study of chaos using statistical measures are consistent with previous studies using classical measures of chaos, as well as with studies using statistical measures of chaos, but for small number of bosons and states with angular momentum greater than 2.

    Comments:
    13 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1505.02730 [pdf]
    PRC(2015)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE