Multipole excitations in hot nuclei within the finite temperature quasiparticle random phase approximation framework

Multipole excitations in hot nuclei within the finite temperature quasiparticle random phase... The effect of temperature on the evolution of the isovector dipole and isoscalar quadrupole excitations in Ni68 and Sn120 nuclei is studied within the fully self-consistent finite temperature quasiparticle random phase approximation framework, based on the Skyrme-type SLy5 energy density functional. The new low-energy excitations emerge due to the transitions from thermally occupied states to the discretized continuum at finite temperatures, whereas the isovector giant dipole resonance is not strongly impacted by the increase of temperature. The radiative dipole strength at low energies is also investigated for the Sn122 nucleus, becoming compatible with the available experimental data when the temperature is included. In addition, both the isoscalar giant quadrupole resonance and low-energy quadrupole states are sensitive to the temperature effect: while the centroid energies decrease in the case of the isoscalar giant quadrupole resonance, the collectivity of the first 2+ state is quenched and the opening of new excitation channels fragments the low-energy strength at finite temperatures. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

Multipole excitations in hot nuclei within the finite temperature quasiparticle random phase approximation framework

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Multipole excitations in hot nuclei within the finite temperature quasiparticle random phase approximation framework

Abstract

The effect of temperature on the evolution of the isovector dipole and isoscalar quadrupole excitations in Ni68 and Sn120 nuclei is studied within the fully self-consistent finite temperature quasiparticle random phase approximation framework, based on the Skyrme-type SLy5 energy density functional. The new low-energy excitations emerge due to the transitions from thermally occupied states to the discretized continuum at finite temperatures, whereas the isovector giant dipole resonance is not strongly impacted by the increase of temperature. The radiative dipole strength at low energies is also investigated for the Sn122 nucleus, becoming compatible with the available experimental data when the temperature is included. In addition, both the isoscalar giant quadrupole resonance and low-energy quadrupole states are sensitive to the temperature effect: while the centroid energies decrease in the case of the isoscalar giant quadrupole resonance, the collectivity of the first 2+ state is quenched and the opening of new excitation channels fragments the low-energy strength at finite temperatures.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
0556-2813
eISSN
1089-490X
D.O.I.
10.1103/PhysRevC.96.024303
Publisher site
See Article on Publisher Site

Abstract

The effect of temperature on the evolution of the isovector dipole and isoscalar quadrupole excitations in Ni68 and Sn120 nuclei is studied within the fully self-consistent finite temperature quasiparticle random phase approximation framework, based on the Skyrme-type SLy5 energy density functional. The new low-energy excitations emerge due to the transitions from thermally occupied states to the discretized continuum at finite temperatures, whereas the isovector giant dipole resonance is not strongly impacted by the increase of temperature. The radiative dipole strength at low energies is also investigated for the Sn122 nucleus, becoming compatible with the available experimental data when the temperature is included. In addition, both the isoscalar giant quadrupole resonance and low-energy quadrupole states are sensitive to the temperature effect: while the centroid energies decrease in the case of the isoscalar giant quadrupole resonance, the collectivity of the first 2+ state is quenched and the opening of new excitation channels fragments the low-energy strength at finite temperatures.

Journal

Physical Review CAmerican Physical Society (APS)

Published: Aug 7, 2017

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