Publisher's Note: Evolution of the pygmy dipole resonance in nuclei with neutron excess [Phys. Rev. C<b>80</b>, 014308 (2009)]

Có, G.; Donno, V. De; Maieron, C.; Anguiano, M.; Lallena, A. M.

doi:10.1103/physrevc.80.019910

Cited by 17 publications

(47 citation statements)

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“…Further analysis also shows that typically 10-20 different transitions contribute 1% or more each to the norm of each low-lying state, which confirms their collective nature, and supports their interpretation as pygmy dipole modes. The proton and neutron transition densities of the strongest low-lying state in 44 Ca that are shown in Fig. 14 exhibit the pygmy mode characteristics: δρ p and δρ n are in phase at short ranges, and out of phase just beyond the surface region of the nucleus, where δρ n also has a pronounced neutron tail, in agreement with other studies [61][62][63]. In Fig.…”

Section: Fromsupporting

confidence: 78%

Quasiparticle random-phase approximation with interactions from the Similarity Renormalization Group

Hergert

Papakonstantinou²,

Roth³

2011

Phys. Rev. C

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We have developed a fully consistent framework for calculations in the Quasiparticle Random Phase Approximation (QRPA) with N N interactions from the Similarity Renormalization Group (SRG) and other unitary transformations of realistic interactions. The consistency of our calculations, which use the same Hamiltonian to determine the Hartree-Fock-Bogoliubov (HFB) ground states and the residual interaction for QRPA, guarantees an excellent decoupling of spurious strength, without the need for empirical corrections. While work is under way to include SRGevolved 3N interactions, we presently account for some 3N effects by means of a linearly densitydependent interaction, whose strength is adjusted to reproduce the charge radii of closed-shell nuclei across the whole nuclear chart. As a first application, we perform a survey of the monopole, dipole, and quadrupole response of the calcium isotopic chain and of the underlying single-particle spectra, focusing on how their properties depend on the SRG parameter λ. Unrealistic spin-orbit splittings suggest that spin-orbit terms from the 3N interaction are called for. Nevertheless, our general findings are comparable to results from phenomenological QRPA calculations using Skyrme or Gogny energy density functionals. Potentially interesting phenomena related to low-lying strength warrant more systematic investigations in the future.

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Section: Fromsupporting

confidence: 78%

Quasiparticle random-phase approximation with interactions from the Similarity Renormalization Group

Hergert

Papakonstantinou²,

Roth³

2011

Phys. Rev. C

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“…in Refs. [40,41]. Alternative information on the PDR structure may be obtained from isoscalar probes [42,43] as demonstrated by studies of the (α, α ′ γ) reaction [21,44].…”

Section: Excitation Ofmentioning

confidence: 99%

Pygmy dipole resonance in208Pb

et al. 2012

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Scattering of protons of several hundred MeV is a promising new spectroscopic tool for the study of electric dipole strength in nuclei. A case study of 208 Pb shows that at very forward angles J π = 1 − states are strongly populated via Coulomb excitation. A separation from nuclear excitation of other modes is achieved by a multipole decomposition analysis of the experimental cross sections based on theoretical angular distributions calculated within the quasiparticle-phonon model. The B(E1) transition strength distribution is extracted for excitation energies up to 9 MeV, i.e., in the region of the so-called pygmy dipole resonance (PDR). The Coulomb-nuclear interference shows sensitivity to the underlying structure of the E1 transitions, which allows for the first time an experimental extraction of the electromagnetic transition strength and the energy centroid of the PDR.

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“…This has been numerically verified by using a Fourier-Bessel formalism to solve the CRPA equations [26][27][28]. In our work, for excitation energies below the continuum threshold, we used the results obtained in the discrete RPA approach [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%