Delbrück scattering at energies of 140–450 MeV

Akhmadaliev, S.; Kezerashvili, G.Ya.; Klimenko, S.; Малышев, В. М.; Maslennikov, A. L.; Milov, A.; Milstein, A. I.; Muchnoi, N. Yu.; Naumenkov, A. I.; Panin, V.S.; Peleganchuk, S. V.; Popov, V.; Поспелов, Г. Е.; Protopopov, I.Ya.; Romanov, L.; Shamov, A.G.; Shatilov, D.; Симонов, Е. А.; Tikhonov, Yu. A.

doi:10.1103/physrevc.58.2844

Cited by 61 publications

(30 citation statements)

References 21 publications

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“…In some cases, the inclusion of high-order terms in Zα essentially modifies the value of the cross section as compared to the Born result. This was convincingly demonstrated in the case of photon scattering by a Coulomb field, the so-called Delbrück scattering [2,3], and for Coulomb field-induced photon splitting [4,5]. The cross section of the Bethe-Heitler process exact in Zα has also been extensively studied [6][7][8][9] as has the process of e + -e − production in heavy ion collisions [10,11].…”

Section: Introductionmentioning

confidence: 88%

Effect of a strong laser field on electron-positron photoproduction by relativistic nuclei

et al. 2010

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We study the influence of a strong laser field on the Bethe-Heitler photoproduction process by a relativistic nucleus. The laser field propagates in the same direction as the incoming high-energy photon, and it is taken into account exactly in the calculations. Two cases are considered in detail. In the first case, the energy of the incoming photon in the nucleus rest frame is much larger than the electron's rest energy. The presence of the laser field may significantly suppress the photoproduction rate at soon-available values of laser parameters. In the second case, the energy of the incoming photon in the rest frame of the nucleus is less than and close to the electron-positron pair-production threshold. The presence of the laser field allows for the pair-production process, and the obtained electron-positron rate is much larger than in the presence of only the laser and the nuclear field. In both cases, we have observed a strong dependence of the rate on the mutual polarization of the laser field and on the high-energy photon, and the most favorable configuration is with laser field and high-energy photon linearly polarized in the same direction. The effects discussed are, in principle, measurable with presently available proton accelerators and laser technology.

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Section: Introductionmentioning

confidence: 88%

Effect of a strong laser field on electron-positron photoproduction by relativistic nuclei

et al. 2010

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“…However, so far the pure electromagnetic nonlinearity of the quantum vacuum though subject to high-energy experiments [4] has not been directly verified on macroscopic scales. The advent and planning of high-intensity laser facilities of the petawatt class has triggered a huge interest in proposals to probe quantum vacuum nonlinearities in realistic all-optical experimental set-ups; for recent reviews, see [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Photon propagation in slowly varying inhomogeneous electromagnetic fields

Karbstein

Shaisultanov

2015

Phys. Rev. D

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Starting from the Heisenberg-Euler effective Lagrangian, we determine the photon current and photon polarization tensor in inhomogeneous, slowly varying electromagnetic fields. To this end, we consider background field configurations varying in both space and time, paying special attention to the tensor structure. As a main result, we obtain compact analytical expressions for the photon polarization tensor in realistic Gaussian laser pulses, as generated in the focal spots of high-intensity lasers. These expressions are of utmost importance for the investigation of quantum vacuum nonlinearities in realistic high-intensity laser experiments.

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“…For inhomogeneities localized in time this is clearly justified for the reasons given above. 4 Plugging the integral representation (12) of + G R into equation (9) and making use of  , the photon polarization tensor only has to be evaluated on the light cone. In this limit it is of a particularly simple form.…”

Section: Quantum Reflectionmentioning

confidence: 99%

“…As electromagnetic fields couple to charges, these virtual charged particle fluctuations can induce effective nonlinear couplings between electromagnetic fields [1][2][3], and affect the propagation of photons. So far, the pure electromagnetic nonlinearity of the quantum vacuum though subject to high-energy experiments [4,5] has not been directly verified on macroscopic scales.…”

Section: Introductionmentioning

confidence: 99%

Quantum reflection of photons off spatio-temporal electromagnetic field inhomogeneities

2015

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We reconsider the recently proposed nonlinear quantum electrodynamics effect of quantum reflection of photons off an inhomogeneous strong-field region. We present new results for strong fields varying both in space and time. While such configurations can give rise to new effects such as frequency mixing, estimated reflection rates based on previous one-dimensional studies are corroborated. On a conceptual level, we critically re-examine the validity regime of the conventional locally-constant-field approximation and identify kinematic configurations which can be treated reliably. Our results further underline the discovery potential of quantum reflection as a new signature of the nonlinearity of the quantum vacuum. OPEN ACCESS RECEIVED

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Delbrück scattering at energies of 140–450 MeV

Abstract: The differential cross section of Delbrück scattering is measured on a bismuth germanate (Bi4Ge3O12) target at photon energies 140 ÷ 450 MeV and scattering angles 2.6 ÷ 16.6 mrad. A good agreement with the theoretical results, obtained exactly in a Coulomb field, is found.

Cited by 61 publications

References 21 publications

Effect of a strong laser field on electron-positron photoproduction by relativistic nuclei

Effect of a strong laser field on electron-positron photoproduction by relativistic nuclei

Photon propagation in slowly varying inhomogeneous electromagnetic fields

Quantum reflection of photons off spatio-temporal electromagnetic field inhomogeneities

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