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Systematics of toroidal dipole modes in Ca, Ni, Zr, and Sn isotopes

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10405240" target="_blank" >RIV/00216208:11320/19:10405240 - isvavai.cz</a>

  • Result on the web

    <a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=69Dp8kzrUp" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=69Dp8kzrUp</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1140/epja/i2019-12770-x" target="_blank" >10.1140/epja/i2019-12770-x</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Systematics of toroidal dipole modes in Ca, Ni, Zr, and Sn isotopes

  • Original language description

    We analyze the relation between isoscalar toroidal modes and so-called pygmy dipole resonance (PDR), which both appear in the same region of low-energy dipole excitations. To this end, we use a theoretical description within the fully self-consistent Skyrme quasiparticle random-phase approximation (QRPA). Test cases are spherical nuclei Ca-40,Ca- 48, Ni-58,Ni- 72, Zr-90,Zr- 100, and Sn-100,Sn- 120,Sn- 132 which cover four different elements and for each element at least two isotopes with different neutron excess, one small and another large. The structure of the modes is investigated in terms of strength functions, transition densities (TD) and transition currents (TC). For all considered nuclei, we see that, independently on whether PDR strength exists or not, the flow pattern in the lower part of the &quot;PDR energy region&quot; is basically an isoscalar vortical toroidal motion with a minor irrotational fraction. A one-to-one correspondence between calculated TD and TC is established. The toroidal flow appears already in the uncoupled two-quasiparticle (2qp) excitations and becomes definitively strong for the QRPA modes. Altogether, we find that low-lying dipole strength often denoted as isoscalar PDR is actually an oversimplified imitation of the basically toroidal motion in nuclei with sufficient neutron excess.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10304 - Nuclear physics

Result continuities

  • Project

    <a href="/en/project/GA19-14048S" target="_blank" >GA19-14048S: Theoretical and experimental search for new features of electromagnetic nuclear excitations</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2019

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    European Physical Journal A

  • ISSN

    1434-6001

  • e-ISSN

  • Volume of the periodical

    55

  • Issue of the periodical within the volume

    12

  • Country of publishing house

    DE - GERMANY

  • Number of pages

    15

  • Pages from-to

    242

  • UT code for WoS article

    000502144600011

  • EID of the result in the Scopus database

    2-s2.0-85076199275