Kinetic-theory description of isoscalar dipole modes

Abrosimov, V. I.; Dellafiore, A.; Matera, F.

doi:10.1016/s0375-9474(01)01273-8

Cited by 22 publications

(22 citation statements)

References 19 publications

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“…The isoscalar-E1 strength, measured, e.g., in 208 Pb [22], seems to fall mainly into two peaks. The high-energy peak, related to the compressibility coefficient K ∞ , [22,23,24,25,26,27,28], is observed to lie between 19 and 23 MeV, depending on the experimental method used [22,23]. Recent interest has focused on a smaller but still substantial low-energy peak around 12 MeV, which has been studied theoretically in the RPA [25,26] as well as experimentally [22].…”

Section: B Interactionsmentioning

confidence: 99%

Time-reversal-violating Schiff moment ofHg199

Jesus

Engel²

2005

Phys. Rev. C

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We calculate the Schiff moment of the nucleus 199 Hg, created by πNN vertices that are odd under parity (P) and time-reversal (T). Our approach, formulated in diagrammatic perturbation theory with important core-polarization diagrams summed to all orders, gives a close approximation to the expectation value of the Schiff operator in the odd-A Hartree-Fock-Bogoliubov ground state generated by a Skyrme interaction and a weak P-and T-odd pion-exchange potential. To assess the uncertainty in the results, we carry out the calculation with several Skyrme interactions, the quality of which we test by checking predictions for the isoscalar-E1 strength distribution in 208 Pb, and estimate most of the important diagrams we omit.

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Section: B Interactionsmentioning

confidence: 99%

Time-reversal-violating Schiff moment ofHg199

Jesus

Engel²

2005

Phys. Rev. C

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“…In the past, studies based on semi-classical approaches, such as the Goldhaber-Teller (GT) [32] or the Steinwedel-Jensen (SJ) [33] models, have given an important contribution to the understanding of the main features of giant resonances and of their link to important nuclear properties, such as compressibility and symmetry energy. In particular, the Vlasov equation has already been shown to describe reasonably well some relevant properties of different collective excitations of nuclei [34][35][36]. It is clear that, within such a semi-classical description, shell effects, certainly important in shaping the fine structure of the dipole response [23], are absent.…”

Section: Introductionmentioning

confidence: 96%

Dipole response in neutron-rich nuclei with new Skyrme interactions

et al. 2016

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We investigate the isoscalar and isovector E1 response of neutron-rich nuclei, within a semiclassical transport model employing effective interactions for the nuclear mean-field. In particular, we adopt the recently introduced SAMi-J Skyrme interactions, whose parameters are specifically tuned to improve the description of spin-isospin properties of nuclei. Our analysis evidences a relevant degree of isoscalar/isovector mixing of the collective excitations developing in neutron-rich systems. Focusing on the low-lying strength emerging in the isovector response, we show that this energy region essentially corresponds to the excitation of isoscalar-like modes, which also contribute to the isovector response owing to their mixed character. Considering effective interactions which mostly differ in the isovector channels, we observe that these mixing effects increase with the slope L of the symmetry energy at saturation density, leading to a larger strength in the low-energy region of the isovector response. This result appears connected to the increase, with L, of the neutron/proton asymmetry at the surface of the considered nuclei, i.e., to the extension of the neutron skin.

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“…[23]. There have been other discussions in the recent literature [24], also in connection with semiclassical models [25].…”

Section: The Isoscalar Giant Dipole Resonancementioning

confidence: 95%

Theoretical understanding of the nuclear incompressibility: where do we stand?

VANGIAI

2004

Nuclear Physics A

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The status of the theoretical research on the compressional modes of finite nuclei and the incompressibility K ∞ of nuclear matter, is reviewed. It is argued that the recent experimental data on the Isoscalar Giant Monopole Resonance (ISGMR) allow extracting the value of K ∞ with an uncertainity of about ± 12 MeV. Non-relativistic (Skyrme, Gogny) and relativistic mean field models predict for K ∞ values which are significantly different from one another, namely ≈ 220-235 and ≈ 250-270 MeV respectively. It is shown that the solution of this puzzle requires a better determination of the symmetry energy at, and around, saturation. The role played by the experimental data of the Isoscalar Giant Dipole Resonance (ISGDR) is also discussed.

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Kinetic-theory description of isoscalar dipole modes

Cited by 22 publications

References 19 publications

Time-reversal-violating Schiff moment ofHg199

Time-reversal-violating Schiff moment ofHg199

Dipole response in neutron-rich nuclei with new Skyrme interactions

Theoretical understanding of the nuclear incompressibility: where do we stand?

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