Nuclear Compton scattering at intermediate energies

Schumacher, M.; Rullhusen, P.; Baumann, A.

doi:10.1007/bf02812963

Cited by 23 publications

(21 citation statements)

References 37 publications

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“…Many important results were obtained by applying dispersion relations to the Compton amplitude (see e.g. [165,166]). For those parts of the amplitude, which are not easily accessible by dispersion theory, microscopic calculations have been attempted, e.g.…”

Section: Compton Scattering Below Pion Threshold: General Aspectsmentioning

confidence: 99%

“…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%

“…However, below meson photoproduction threshold the possible uncertainty is only of the order of a few percent as discussed in [95]. Furthermore, the possibility of using a modified form factor which incorporates binding effects has been discussed in [166]. This modified form is given by [2] …”

Section: The Nonrelativistic Photon-nucleus Interaction and The Concementioning

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: Compton Scattering Below Pion Threshold: General Aspectsmentioning

confidence: 99%

Section: Compton Scattering Below Pion Threshold: General Aspectsmentioning

confidence: 99%

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Compton scattering by nuclei

et al. 2000

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“…The free-nucleon electromagnetic polarizabilitiesᾱ andβ have been replaced by the corresponding bound-nucleon quantities,α andβ, because of a possible change of these quantities due to a modification of the internal nucleon structure. Theoretical discussions may be found in [3,29,30]. The spin-independent parts of the Born terms are represented by the Thomson amplitude only, though there are additional terms which depend on the anomalous magnetic moments.…”

Section: Scattering Amplitudesmentioning

confidence: 99%

“…This quantity is slightly different from the gauge invariant quantitȳ α n withᾱ n − α n = 0.62 (in units of 10 −4 f m 3 ) [1]. For a clear-cut definition of the in-medium polarizabilities of the nucleon [2,3] we have to distinguish between (i) effects of the internal structure of the nucleon entering intoα N andβ N which are one-body quantities and may be considered as the true inmedium electromagnetic polarizabilities, and (ii) two-body effects of meson exchange currents between p-n pairs which may be denoted by δα and δβ. From a phenomenological point of view these latter quantities are not part of the in-medium electromagnetic polarizabilities but are used to parametrize that part of the "mesonic seagull amplitude" (Thomson scattering by correlated p-n pairs) which is energy dependent in the forward direction.…”

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confidence: 98%