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Tryggestad, E.; Baumann, T.; Heckman, P.; Thoennessen, M.; Aumann, T.; Bazin, D.; Blumenfeld, Y.; Beene, J. R.; Lewis, T. A.; Radford, D. C.; Shapira, D.; Varner, R. L.; Chartier, M.; Halbert, M. L.; Liang, J. F.

doi:10.1103/physrevc.67.064309

Cited by 52 publications

(44 citation statements)

References 36 publications

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“…The low-energy dipole states have been observed in a number of nuclei: neutron-rich O isotopes [1,2], 26 Ne [3], stable Ca isotopes [4,5], 56 Fe and 58 Ni [6], 68 Ni [7], 88 Sr [8], 90 Zr [9,10], Sn isotopes [11][12][13][14][15], N = 82 isotones [16][17][18][19][20][21], and stable Pb isotopes [22][23][24][25][26]. The observed low-energy E1 strength exhausts less than 1% of the Thomas-Reiche-Kuhn (TRK) sum-rule value in stable isotopes, while it may amount up to about 5% in neutron-rich nuclei.…”

Section: Introductionmentioning

confidence: 99%

Systematic investigation of low-lying dipole modes using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory

2014

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Systematic investigations of the electric dipole (E1) modes of excitation are performed using the canonicalbasis time-dependent Hartree-Fock-Bogoliubov (Cb-TDHFB) theory. The Cb-TDHFB is able to describe dynamical pairing correlations in excited states of nuclear systems. We apply the method to the real-time calculation of linear response in even-even nuclei with Skyrme functionals. Effects of shell structure, neutron skin, deformation, and neutron chemical potential (separation energy) are studied in a systematic way. This reveals a number of characteristic features of the low-energy E1 modes. We also find a universal behavior in the low-energy E1 modes for heavy neutron-rich isotopes, which suggests the emergence of decoupled E1 peaks beyond N = 82.

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Section: Introductionmentioning

confidence: 99%

Systematic investigation of low-lying dipole modes using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory

2014

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“…The strengths collected by these two 1 − states are B(E1) = 0.49 e 2 f m 2 and B(E1) = 0.50 e 2 f m 2 respectively. Experimentally, two E1 excitations below the neutron threshold, in the 5−7 MeV energy interval, were observed in a virtual-photon scattering experiment [29,30,41]. These two states, however, collect an almost negligible E1 integrated strength, B(E1) ∼ 0.1 e 2 f m 2 .…”

Section: Dipole Response In Oxygen Isotopesmentioning

confidence: 99%

A self-consistent study of multipole response in neutron-rich nuclei using a modified realistic potential

Bianco

Knapp

Iudice

et al. 2014

J. Phys. G: Nucl. Part. Phys.

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Abstract. The multipole response of neutron rich O and Sn isotopes is computed in Tamm-Dancoff and random-phase approximations using the canonical Hartree-Fock-Bogoliubov quasi-particle basis. The calculations are performed using an intrinsic Hamiltonian composed of a V lowk potential, deduced from the CD-Bonn nucleon-nucleon interaction, corrected with phenomenological density dependent and spin-orbit terms. The effect of these two pieces on energies and multipole responses is discussed. The problem of removing the spurious admixtures induced by the center of mass motion and by the violation of the number of particles is investigated. The differences between the two theoretical approaches are discussed quantitatively. Attention is then focused on the dipole strength distribution, including the low-lying transitions associated to the pygmy resonance. Monopole and quadrupole responses are also briefly investigated. A detailed comparison with the available experimental spectra contributes to clarify the extent of validity of the two self-consistent approaches. ‡ present address : Ecole Normale Superieur (ENS) de Cachan, 61 av. du Président Wilson, Cachan -France Self-consistent study of multipole response in neutron rich nuclei using a modified realistic potential2

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“…In-beam γ -ray experiments were also done using the 18 O(t,pγ ) reaction at 10 and 12 MeV [32], intermediate-energy Coulomb excitation at 10 MeV/u [33], single-step fragmentation of a 77.5 MeV/u 36 S beam on a Be target [3], and the 10 Be( 14 C,α) fusion-evaporation reaction [34]. The β and βn decay of 20 N and 21 N populated γ -decaying transitions in 20 O as well as levels above the neutron threshold (S n = 7.6 MeV) [35].…”

mentioning

confidence: 99%

Experimental study of the19O(d,p)20O

et al. 2012

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The neutron-adding (d,p) reaction was carried out in inverse kinematics to investigate the single-neutron overlap with the 19 O ground state. Eight states in 20 O were populated with measurable strength and a Q-value resolution of approximately 175 keV FWHM was achieved. Cross sections, angular distributions, spectroscopic factors, and T = 1 diagonal two-body matrix elements were deduced. Results are discussed in terms of shellmodel calculations confined to the 0d 5/2 , 1s 1/2 , and 0d 3/2 orbitals.

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Low-lyingE1strength in20O

Cited by 52 publications

References 36 publications

Systematic investigation of low-lying dipole modes using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory

Systematic investigation of low-lying dipole modes using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory

A self-consistent study of multipole response in neutron-rich nuclei using a modified realistic potential

Experimental study of the19O(d,p)20O

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