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 "PDR energy region" 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
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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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
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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