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Nuclear Theory·nucl-th

Friday·May 22, 2015

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    [Submitted on 21 May 2015]

    B+ states with chain-like structures in N

    Yoshiko Kanada-En'yo

    I investigate B+ cluster states of N with a B+ cluster model. Near the -decay threshold energy, I obtain and rotational bands having B()+ and B()+ components, respectively. I assign the band-head state of the band to the experimental at =13.19 MeV of N observed in scattering reactions by B and show that the calculated -decay width is consistent with the experimental data. I discuss an -cluster motion around the B cluster and show that B+ cluster states contain significant components of a linear-chain 3 configuration, in which an cluster is localized in the longitudinal direction around the deformed B cluster.

    Comments:
    14 pages, 11 figures, 2 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1505.05591 [pdf]
    PRC(2015)·5 citations
  2. 02

    [Submitted on 21 May 2015]

    Collective aspects deduced from time-dependent microscopic mean-field with pairing: application to the fission process

    Yusuke Tanimura · Denis Lacroix · Guillaume Scamps

    Given a set of collective variables, a method is proposed to obtain the associated conjugated collective momenta and masses starting from a microscopic time-dependent mean-field theory. The construction of pairs of conjugated variables is the first step to bridge microscopic and macroscopic approaches. The method is versatile and can be applied to study a large class of nuclear processes. An illustration is given here with the fission of Fm. Using the quadrupole moment and eventually higher-order multipole moments, the associated collective masses are estimated along the microscopic mean-field evolution. When more than one collective variable are considered, it is shown that the off-diagonal matrix elements of the inertia play a crucial role. Using the information on the quadrupole moment and associated momentum, the collective evolution is studied. It is shown that dynamical effects beyond the adiabatic limit are important. Nuclei formed after fission tend to stick together for longer time leading to a dynamical scission point at larger distance between nuclei compared to the one anticipated from the adiabatic energy landscape. The effective nucleus-nucleus potential felt by the emitted nuclei is finally extracted.

    Comments:
    12 pages, 9 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1505.05647 [pdf]
    PRC(2015)·50 citations

Affiliations

first authorsco-authorsvia INSPIRE