Photoneutron cross sections of 208Pb and 197Au

Veyssière, A.; Beil, H.; Bergère, R.; Carlos, P.; Leprêtre, A.

doi:10.1016/0375-9474(70)90727-x

Cited by 354 publications

(220 citation statements)

References 36 publications

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“…This value is somewhat smaller than the 122% reported in Ref. [32]. It is because the continuum in our RPA calculation was approximated by narrow quasibound states.…”

Section: + Component Of the Dgdrcontrasting

confidence: 61%

“…For example, the experimental value of the total DGDR excitation in the reaction 208 Pb (640A MeV) + 208 Pb, for which the calculations have been performed, equals to 0,38(4) b. As mentioned above our chosen six 1 − states exhaust only 90.6% of EWSR while the photo-neutron data [32] indicate that this value equals to 122%. Due to this underestimate of exhaust of the EWSR the cross section for the DGDR excitation reduces more strongly than the one for the single GDR.…”

Section: + Component Of the Dgdrmentioning

confidence: 80%

“…(31,32,33) gives the probability of exciting the target nucleus from the initial state | I i M i > to the final state | I f M f > in a collision with impact parameter b. If the orientation of the initial state is not specified, the probability for exciting the nuclear state of energy E f and spin I f is…”

Section: Excitation Probabilities and Virtual Photon Numbersmentioning

confidence: 99%

“…In order to calculate the inelastic cross section for the excitation of the GDR, we use a Lorentzian parameterization for the photoabsorption cross section of 208 Pb [32], assumed to be all E1, with E GDR = 13.5 MeV and Γ = 4.0 MeV. Inserting this form into Eq.…”

Section: Singles Spectra In Coulomb Excitation Of Gdrmentioning

confidence: 99%

“…For the latter, we use the numerically-defined data set of Ref. [32] rather than a Lorentzian parameterization. The effect of the underlying compound nuclear levels (i.e., the statistical contribution to the photon scattering) is also included.…”

Section: Excitation and Photon Decay Of The Gdrmentioning

confidence: 99%

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Microscopic studies of two-phonon giant resonances

Ponomarev

1999

Nuclear Physics A

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A new class of giant resonances in nuclei, namely double giant resonances, is discussed. They are giant resonances built on top of other giant resonances. Investigation on their properties, together with similar studies on low-lying two-phonon states, should give an answer on how far the harmonic picture of boson-type excitations holds in the finite fermion systems like atomic nuclei.The main attention in this review is paid to double giant dipole resonances (DGDR) which are observed in relativistic heavy ion collisions with very large cross sections. A great experimental and theoretical effort is underway to understand the reaction mechanism which leads to the excitation of these states in nuclei, as well as the better microscopic understanding of their properties. The Coulomb mechanism of the excitation of single and double giant resonances in heavy ion collision at different projectile energies is discussed in details. A contribution of the nuclear excitation to the total cross section of the reaction is also considered. The Coulomb excitation of double resonances is described within both, the second-order perturbation theory approach and in coupled-channels calculation. The properties of single and double resonances are considered within the phenomenologic harmonic vibrator model and microscopic quasiparticle-RPA approach. For the last we use the Quasiparticle-Phonon Model (QPM) the basic ideas and formalism of which are presented. The QPM predictions of the DGDR properties (energy centroids, widths, strength distributions, anharmonicities and excitation cross sections) are compared to predictions of harmonic vibrator model, results of other microscopic calculations and experimental data available. : 24.30.Cz, 25.70.De, Pacs

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“…This value is somewhat smaller than the 122% reported in Ref. [32]. It is because the continuum in our RPA calculation was approximated by narrow quasibound states.…”

Section: + Component Of the Dgdrcontrasting

confidence: 61%

Section: + Component Of the Dgdrmentioning

confidence: 80%