The Double Compton Effect

Cavanagh, P.E.

doi:10.1103/physrev.87.1131

Cited by 35 publications

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“…A CB event results from the detection of bremsstrahlung produced by the recoil Compton electron in coincidence with the single photon Compton scattered gamma ray. A theoretical calculation of the CB events is rendered uncertain by scattering of the recoil electron before emission of bremsstrahlung, so an experimental approach suggested by Cavanagh [10] is used to eliminate CB events. The DPC count rate varies linearly and the CB count rate quadratically with target thickness.…”

Section: Resultsmentioning

confidence: 99%

Scattering and absorption differential cross sections for double photon Compton scattering

et al. 2001

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The scattering and absorption differential cross sections for nonlinear QED process such as double photon Compton scattering have been measured as a function of independent final photon energy. The incident gamma photons are of 0.662 MeV in energy as produced by an 8 Ci 137 Cs radioactive source and thin aluminum foils are used as scatterer. The two simultaneously emitted photons in this process are detected in coincidence using two NaI(T1) scintillation detectors and a slow-fast coincidence set-up of 30 nsec resolving time. The measured values of scattering and absorption differential cross sections agree with theory within experimental estimated error.

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Section: Resultsmentioning

confidence: 99%

Scattering and absorption differential cross sections for double photon Compton scattering

et al. 2001

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“…(Linear) Compton scattering, i.e., the emission of a single photon by an electron via the absorption of another photon, has been investigated theoretically and experimentally since the formulation of QED itself, and it has provided relevant information on the structure of the theory at high energies [3]. The related process in which two photons are emitted ((linear) double Compton scattering) has also been investigated both theoretically [4] and experimentally [5].When an electron is driven by an intense electromagnetic field, the emission of photons may occur with the absorption of many photons from the field. High-power lasers are sources of strong electromagnetic fields with unprecedented intensities [6] and they represent an irreplaceable tool to test the high-intensity or strong-field sector of QED, as complementary to the high-energy one.…”

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confidence: 99%

Nonlinear Double Compton Scattering in the Ultrarelativistic Quantum Regime

2013

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A detailed analysis of the process of two-photon emission by an electron scattered from a high-intensity laser pulse is presented. The calculations are performed in the framework of strong-field QED and include exactly the presence of the laser field described as a plane wave. We investigate the full nonlinear quantum regime of interaction with a few-cycle pulse, where nonlinear effects in the laser field amplitude, photon recoil, and the short pulse duration substantially alter the emitted photon spectra as compared to those in previously studied regimes. We provide a semiclassical explanation for such differences, based on the possibility of assigning a trajectory to the electron in the laser field before and after each quantum photon emission. Our numerical results indicate the feasibility of investigating experimentally the full ultrarelativistic quantum regime of nonlinear double Compton scattering with available electron accelerator and laser technology.

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“…However, the peak field strengths are still orders of magnitudes below the quantum electrodynamic (QED) critical field E c = −m 2 /e = 10 16 V/cm for pair creation (here m and e = −|e| denote the mass and charge of the electron, respectively, and we use natural relativistic units c = = ǫ 0 = 1). Two-photon emission by a laser-dressed electron via nonperturbative double Compton backscattering is a strong-field, relativistic quantum effect which could be observed without the additional complications connected with the ultra-relativistic particle beams necessary for laser-dressed pair creation [8,9,10].The theory of perturbative double Compton scattering, the reaction in which one photon scatters on an electron to produce two final photons was calculated by Mandl and Skyrme [11], recently reexamined in [12], and experimentally confirmed in [13,14]. The relevant Feynman diagrams…”

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confidence: 99%

“…The theory of perturbative double Compton scattering, the reaction in which one photon scatters on an electron to produce two final photons was calculated by Mandl and Skyrme [11], recently reexamined in [12], and experimentally confirmed in [13,14]. The relevant Feynman diagrams PSfrag replacements(a)…”

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Nonperturbative Treatment of Double Compton Backscattering in Intense Laser Fields

Lötstedt

Jentschura

2009

Phys. Rev. Lett.

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The emission of a pair of entangled photons by an electron in an intense laser field can be described by two-photon transitions of laser-dressed, relativistic Dirac-Volkov states. In the limit of a small laser field intensity, the two-photon transition amplitude approaches the result predicted by double Compton scattering theory. Multi-exchange processes with the laser field, including a large number of exchanged laser photons, cannot be described without the fully relativistic Dirac-Volkov propagator. The nonperturbative treatment significantly alters theoretical predictions for future experiments of this kind. We quantify the degree of polarization correlation of the photons in the final state by employing the well-established concurrence as a measure of the entanglement.PACS numbers: 12.20. Ds, 34.50.Rk, 32.80.Wr, 03.65.Ud, 13.60.Fz Introduction.-In ordinary Compton scattering [1], a photon is scattered inelastically by an electron. For photons with energy much less than the electron's rest mass, the quantum mechanical expression for the cross section agrees with the one obtained by classical electrodynamics. Nonlinear Compton scattering is encountered when several photons from a strong laser beam are scattered by a free electron to produce a photon of different energy; this process has been calculated theoretically [2,3] and successfully measured [4,5]. Recently, there has been an increased interest in a different nonlinear generalization of Compton scattering where a free electron collides with a laser pulse and emits two photons at the same time. This process has no classical counterpart, and indeed, as we will see, the two photons exhibit a paradigmatic quantum feature: namely, their polarizations are entangled. Properly optimized, two-photon emission from backscattering of laser photons at an electron beam holds the promise of providing entangled light at much larger energy than conventionally used for quantum information purposes [6].With relativistically strong lasers being available in many laboratories worldwide, the current record being a laser intensity of 10 22 W/cm 2 at the focus [7], the quest for observing genuine laser-induced quantum effects in the relativistic regime continues. However, the peak field strengths are still orders of magnitudes below the quantum electrodynamic (QED) critical field E c = −m 2 /e = 10 16 V/cm for pair creation (here m and e = −|e| denote the mass and charge of the electron, respectively, and we use natural relativistic units c = = ǫ 0 = 1). Two-photon emission by a laser-dressed electron via nonperturbative double Compton backscattering is a strong-field, relativistic quantum effect which could be observed without the additional complications connected with the ultra-relativistic particle beams necessary for laser-dressed pair creation [8,9,10].The theory of perturbative double Compton scattering, the reaction in which one photon scatters on an electron to produce two final photons was calculated by Mandl and Skyrme [11], recently reexamined in [12], and exper...

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The Double Compton Effect

Cited by 35 publications

References 0 publications

Scattering and absorption differential cross sections for double photon Compton scattering

Scattering and absorption differential cross sections for double photon Compton scattering

Nonlinear Double Compton Scattering in the Ultrarelativistic Quantum Regime

Nonperturbative Treatment of Double Compton Backscattering in Intense Laser Fields

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