Pairing and deformation effects in nuclear excitation spectra

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10368638" target="_blank" >RIV/00216208:11320/17:10368638 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1140/epja/i2017-12406-3" target="_blank" >http://dx.doi.org/10.1140/epja/i2017-12406-3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epja/i2017-12406-3" target="_blank" >10.1140/epja/i2017-12406-3</a>

Result language

angličtina

Original language name

Pairing and deformation effects in nuclear excitation spectra

Original language description

We investigate effects of pairing and of quadrupole deformation on two sorts of nuclear excitations,gamma-vibrational K-pi = 2(+) states and dipole resonances (isovector dipole, pygmy, compression, toroidal). The analysis is performed within the quasiparticle random phase approximation (QRPA) based on the Skyrme energy functional using the Skyrme parametrization SLy6. Particular attention is paid to i) the role of the particle-particle (pp) channel in the residual interaction of QRPA, ii) comparison of volume pairing (VP) and surface pairing (SP), iii) peculiarities of deformation splitting in the various resonances. We find that the impact of the pp-channel on the considered excitations is negligible. This conclusion applies also to any other excitation except for the K-pi = 0(+) states. Furthermore, the difference between VP and SP is found small (with exception of peak height in the toroidal mode). In the low-energy isovector dipole (pygmy) and isoscalar toroidal modes, the branch K-pi = 1 is shown to dominate over the K-pi = 0 one in the range of excitation energy E &lt; 8-10 MeV. The effect becomes impressive for the toroidal resonance whose low-energy part is concentrated in a high peak of almost pure K-pi = 1 nature. This peculiarity may be used as a fingerprint of the toroidal mode in future experiments. The interplay between pygmy, toroidal and compression resonances is discussed, the interpretation of the observed isoscalar giant dipole resonance is partly revised.

Czech name

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Czech description

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Type

J_imp - 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

Project

<a href="/en/project/GA13-07117S" target="_blank" >GA13-07117S: Statistical approaches to quantum many-body systems</a><br>

Continuities

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

Publication year

2017

Confidentiality

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

Name of the periodical

European Physical Journal A

ISSN

1434-6001

e-ISSN

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Volume of the periodical

53

Issue of the periodical within the volume

11

Country of publishing house

DE - GERMANY

Number of pages

12

Pages from-to

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UT code for WoS article

000415745600002

EID of the result in the Scopus database

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