Tensor Effects in Pygmy Dipole Excitation

Yüksel, Esra; Bozkurt, Kutsal

doi:10.1142/s0218301311020216

Cited by 8 publications

(10 citation statements)

References 15 publications

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“…This leads to the appearance of a soft monopole mode that increases the monopole moment m −1 and, consequently, decreases the deduced value of K A . Soft monopole modes have been predicted in several studies [19][20][21]37]. In Ref.…”

Section: B Results and Interpretationmentioning

confidence: 91%

Incompressibility of finite fermionic systems: Stable and exotic atomic nuclei

et al. 2013

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The incompressibility of finite fermionic systems is investigated using analytical approaches and microscopic models. The incompressibility of a system is directly linked to the zero-point kinetic energy of constituent fermions, and this is a universal feature of fermionic systems. In the case of atomic nuclei, this implies a constant value of the incompressibility in medium-heavy and heavy nuclei. The evolution of nuclear incompressibility along Sn and Pb isotopic chains is analyzed using global microscopic models, based on both nonrelativistic and relativistic energy functionals. The result is an almost constant incompressibility in stable nuclei and systems not far from stability and a steep decrease in nuclei with pronounced neutron excess, caused by the emergence of a soft monopole mode in neutron-rich nuclei.

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Section: B Results and Interpretationmentioning

confidence: 91%

Incompressibility of finite fermionic systems: Stable and exotic atomic nuclei

et al. 2013

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“…In the final stage of the preparation of this manuscript we have become aware that a similar analysis has been performed in Ref. [27].…”

Section: Introductionmentioning

confidence: 93%

“…In addition, recent extensive theoretical calculations indicate that such a low-energy peak is a common property of neutron-rich nuclei [21]. However, for this PDR, the isoscalar character, the collective or single particle nature and the sensitivity to the density dependence of the symmetry energy are nowadays under debate [13,[21][22][23][24][25][26][27] Hereinafter, we will refer to the low-energy peak present in the isovector dipole response as pygmy dipole strength (PDS) instead of the commonly used PDR since the resonant (collective) nature of such a peak has not been confirmed yet. Such an observable is not only important for nuclear structure applications.…”

Section: Introductionmentioning

confidence: 99%

Low-lying dipole response: isospin character and collectivity in ${}^{68}$Ni, ${}^{132}$Sn and ${}^{208}$Pb

Roca-Maza,

Pozzi,

Brenna

et al. 2011

Preprint

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The isospin character, the collective or single-particle nature, and the sensitivity to the slope of the nuclear symmetry energy of the low-energy isovector dipole response (known as pygmy dipole resonance) are nowadays under debate. In the present work we study, within the fully self-consistent non-relativistic mean field (MF) approach based on Skyrme Hartree-Fock plus Random Phase Approximation (RPA), the measured even-even nuclei 68 Ni, 132 Sn and 208 Pb. To analyze the model dependence in the predictions of the pygmy dipole strength, we employ three different Skyrme parameter sets. We find that both the isoscalar and the isovector dipole responses of all three nuclei show a low-energy peak that increases in magnitude, and is shifted to larger excitation energies, with increasing values of the slope of the symmetry energy at saturation. We highlight the fact that the collectivity associated with the RPA state(s) contributing to this peak is different in the isoscalar and isovector case, or in other words it depends on the external probe. While the response of these RPA states to an isovector operator does not show a clear collective nature, the response to an isoscalar operator is recognizably collective, for all analyzed nuclei and all studied interactions.

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“…Most often the LES is interpreted as a "pygmy dipole resonance" (PDR) modeled as the oscillation of the neutron excess against the nuclear core [1, [3][4][5]. There are, however, serious objections against such a simplistic collective picture [6,7]. In fact, the landscape of LES may be much richer.…”

mentioning

confidence: 99%

“…Similar arguments in favor of the PDR treatment were earlier presented in relativistic [4] and Skyrme [5] meanfield calculations, and taken up in most of subsequent publications. Recent explorations question the simple PDR-type collectivity of LES [6,7,13], though without analysis of LES velocity fields.…”

mentioning

confidence: 99%

On the toroidal nature of the low-energy E1 mode

Repko,

Reinhard,

Nesterenko

et al. 2012

Preprint

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Tensor Effects in Pygmy Dipole Excitation

Cited by 8 publications

References 15 publications

Incompressibility of finite fermionic systems: Stable and exotic atomic nuclei

Incompressibility of finite fermionic systems: Stable and exotic atomic nuclei

Low-lying dipole response: isospin character and collectivity in ${}^{68}$Ni, ${}^{132}$Sn and ${}^{208}$Pb

On the toroidal nature of the low-energy E1 mode

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