Elastic γ-p scattering at 40 to 70 MeV and polarizability of the proton

Goldansky, V.I.; Karpukhin, O.A.; Kutsenko, A. V.; Pavlovskaya, V.V.

doi:10.1016/0029-5582(60)90418-1

Cited by 66 publications

(27 citation statements)

References 21 publications

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“…(2) and the theoretical estimate (3) and is also close to the proton electric polarizability, n~xp ,,~ 11 [20][21][22][23][24]. According to dispersion theory [12], a small difference a n -c~p ~ 2 can be expected as being due to the nucleon recoil while exciting the pionic cloud of the nucleon by a probe.…”

Section: Introductionmentioning

confidence: 78%

Photon scattering on quasi-free neutrons in the reaction ?d???np and neutron polarizabilities

1994

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Abstract. The possibility to obtain information on 7n scattering at intermediate energies from the reaction vd--. ?'np is analyzed. To this aim, the differential cross section d36/d~r, df~n dE,, and the scattering asymmetry with linearly polarized photons are calculated at photon energies 100 to 400 MeV in the diagrammatic approach. The pole diagrams of the impulse approximation are evaluated with realistic 7n and 7P scattering amplitudes. One-loop diagrams with np rescattering in the final state and with meson-exchange and isobar currents are taken into account as well. The main contribution to the differential cross section d3a/d~,, d~ n dE n in the kinematics of quasi-free 7n scattering arises from the neutron pole diagram. The correction due to other diagrams is typically -30~ to -10~ and decreases with increasing photon energy and momentum transfer. The sensitivity of the cross sections to the magnitude of the neutron electric polarizability and to the sign of the n ~ --. 27 decay constant is demonstrated.

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Section: Introductionmentioning

confidence: 78%

Photon scattering on quasi-free neutrons in the reaction ?d???np and neutron polarizabilities

1994

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“…Separately, polarizabilities of the free proton have been measured in proton Compton scattering experiments performed at photon energies below photo-meson threshold [233][234][235][236][237]. Their results are partly summarized in the review paper [99] and in the Review of Particle Physics 1998 [238] (in fact, the latter reference relies on a "global average" over experiments of 90's derived in [237] on the base of the Baldin-Lapidus sum rule and experimental data on the differential cross section of proton Compton scattering).…”

Section: Status Of the Free Polarizabilities Of The Nucleonmentioning

confidence: 99%

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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“…been determined through photon scattering on the proton and the subsequent use of dispersion relations. The experimental value [17,18] of Ze~2 9 10-4fro 3 is not terribly accurate (and should be redetermined using one of the modern tagged photon beams at an electron accelerator) but after subtracting the calculated [19] diamagnetic contribution -this procedure is also not model independent and hence not free from uncertainties -one obtains a value ZPARA P ~7" 10-4 fm 3.…”

Section: Nucleonic Paramagnetic Susceptibilitymentioning

confidence: 99%

On the scaling of the paramagnetic susceptibility of atoms, nuclei and nucleons

Knüpfer

Richter

1985

Z Physik A

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The present status of the paramagnetic susceptibility of nuclei derived from measurements of magnetic dipole ground state transitions is reported. The values for nuclei are compared with corresponding values from atomic and nucleonic matter. It is found that the mean paramagnetic susceptibilities of atoms (typical values of metals are chosen for comparison), nuclei and nucleons scale with the corresponding Fermi energies.

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Elastic γ-p scattering at 40 to 70 MeV and polarizability of the proton

Cited by 66 publications

References 21 publications

Photon scattering on quasi-free neutrons in the reaction ?d???np and neutron polarizabilities

Photon scattering on quasi-free neutrons in the reaction ?d???np and neutron polarizabilities

Compton scattering by nuclei

On the scaling of the paramagnetic susceptibility of atoms, nuclei and nucleons

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