Concentration of Isovector Giant-Quadrupole Strength in
                    <sup>208</sup>
                    Pb near 17.7 MeV

Fuhrberg, K.; Mondry, G.; Nowotny, D.; Brinkmann, H.-J.; Ludwig, Martin; Müller, G.; Scharfe, W.; Schumacher, M.

doi:10.1209/0295-5075/9/5/004

Cited by 2 publications

(6 citation statements)

References 17 publications

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“…One experiment of this type has been carried for 209 Bi [63], being an immediate neighbor of 208 Pb. The advantage of investigating 209 Bi instead of 208 Pb is, that because of the much higher level density the cross section is a smooth function of energy whereas that of 208 Pb is rather fragmented [64]. Furthermore, information on magnetic moments to compare with when studying the Fujita-Hirata relation (see section 7) is most clear-cut for 209 Bi which has one valence nucleon out side a closed core.…”

Section: Scaling Of Giant Resonance Parameters Via Compton Scatteringmentioning

confidence: 99%

“…At low energies (5-100 MeV) also the method of off-axis tagging [33,59] leads to reasonable degrees of linear polarization. An other type of experiments which has to be mentioned here has achieved very high energy resolution (≈ 10 keV) due to the use of Ge(Li) detectors and due to the use of photons from nuclear reactions [60][61][62][63][64][65][66]. These experiments were restricted to energies from about 5 MeV [61] to 17.4 MeV [63].…”

Section: Nuclear Compton Scattering Experiments From the Mid-1970th T...mentioning

confidence: 99%

“…Several experiments on Compton scattering by nuclei were concerned with multipole decompositions of giant resonances [13,15,16,18,19,21,25,26,30,33,64]. The comparatively weak electric quadrupole amplitude is enhanced through interference with the dominant electric-dipole amplitude.…”

Section: Motivations For Studying Nuclear Compton Scatteringmentioning

confidence: 99%

“…In the last few years several important pieces of information have been extracted from the experimental data. At low energies the relative strengths of electromagnetic multipoles were analyzed [13,16,19,25,33,64,95,169] for comparison with predictions from multipole sum rules. The interesting question, whether the electromagnetic polarizabilities of the nucleon inside the nucleus essentially differ from those of the free nucleon, has been theoretically addressed [80,82,104,166,168] and experimentally studied with good accuracy [39,43,48,170].…”

Section: Compton Scattering Below Pion Threshold: General Aspectsmentioning

confidence: 99%

“…The quadrupole strength shows up as an interference of E2 and E1 resonance amplitudes. A further property of the IVGQR of 208 Pb which only can be seen through Compton scattering at high energy-resolution by using photons from nuclear reactions and Ge(Li) detectors [64] is its partial fragmentation. This experiment [64] showed that there is E2 strength located at about 17.6 MeV.…”

Section: The Isovector Giant-quadrupole Resonance and Higher Multipolesmentioning

confidence: 99%

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Compton scattering by nuclei

et al. 2000

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The concept of Compton scattering by even-even nuclei from giant-resonance to nucleon-resonance energies and the status of experimental and theoretical researches in this field are outlined. The description of Compton scattering by nuclei starts from different complementary approaches, namely from second-order S-matrix and from dispersion theories. Making use of these, it is possible to incorporate into the predicted nuclear scattering amplitudes all the information available from other channels, viz. photon-nucleon and photon-meson channels, and to efficiently make use of models of the nucleon, the nucleus and the nucleon-nucleon interaction. The total photoabsorption cross section constrains the nuclear scattering amplitude in the forward direction. The specific information obtained from Compton scattering therefore stems from the angular dependence of the nuclear scattering amplitude, providing detailed insight into the dynamics of the nuclear and nucleon degrees of freedom and into the interplay between them. Nuclear Compton scattering in the giant-resonance energy-region provides information on the dynamical properties of the in-medium mass of the nucleon. Most prominently, the electromagnetic polarizabilities of the nucleon in the nuclear medium can be extracted from nuclear Compton scattering data obtained in the quasideuteron energy-region. In our description of this latter process special emphasis is laid upon the exploration of many-body and two-body effects entering into the nuclear dynamics. Recent results are presented for two-body effects due to the mesonic seagull amplitude and due to the excitation of nucleon internal degrees of freedom accompanied by meson exchanges. Due to these studies the inmedium electromagnetic polarizabilities are by now well understood, whereas the understanding of nuclear Compton scattering in the ∆-resonance range is only at the beginning. Furthermore, phenomenological methods how to include retardation effects in the scattering amplitude are discussed and compared with model predictions.

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Section: Scaling Of Giant Resonance Parameters Via Compton Scatteringmentioning

confidence: 99%