Elastic photon-deuteron scattering and the nucleon polarizability

Tenore, A.; Verganelakis, A.

doi:10.1007/bf02734837

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…Several calculations of deuteron Compton scattering were performed in the 1950s and 1960s [277][278][279][280][281]. The earliest were based on the impulse approximation, which is poor because of the large size of the exchange currents depicted in Fig.…”

Section: Deuteron Compton Scattering: Model Calculationsmentioning

confidence: 99%

Using Effective Field Theory to analyse low-energy Compton scattering data from protons and light nuclei

Grießhammer

McGovern

Phillips

et al. 2012

Progress in Particle and Nuclear Physics

168

353

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Compton scattering from protons and neutrons provides important insight into the structure of the nucleon. For photon energies up to about 300 MeV, the process can be parameterised by six dynamical dipole polarisabilities which characterise the response of the nucleon to a monochromatic photon of fixed frequency and multipolarity. Their zero-energy limit yields the well-known static electric and magnetic dipole polarisabilities α E1 and β M 1 , and the four dipole spin polarisabilities. The emergence of full lattice QCD results and new experiments at MAMI (Mainz), HIγS at TUNL, and MAX-Lab (Lund) makes this an opportune time to review nucleon Compton scattering. Chiral Effective Field Theory (χEFT) provides an ideal analysis tool, since it encodes the well-established low-energy dynamics of QCD while maintaining an appropriately flexible form for the Compton amplitudes of the nucleon. The same χEFT also describes deuteron and 3 He Compton scattering, using consistent nuclear currents, rescattering and wave functions, and respects the low-energy theorems for photon-nucleus scattering. It can thus also be used to extract useful information on the neutron amplitude from Compton scattering on light nuclei. We summarise past work in χEFT on all of these reactions and compare with other theoretical approaches. We also discuss all proton experiments up to about 400 MeV, as well as the three modern elastic deuteron data sets, paying particular attention to the precision and accuracy of each set. Constraining the ∆(1232) parameters from the resonance region, we then perform new fits to the proton data up to ω lab = 170 MeV, and a new fit to the deuteron data. After checking in each case that a two-parameter fit is compatible with the respective Baldin sum rules, we obtain, using the sum-rule constraints in a one-parameter fit, α (p) E1 = 10.7 ± 0.3(stat) ± 0.2(Baldin) ± 0.8(theory), β (p) M 1 = 3.1 ∓ 0.3(stat) ± 0.2(Baldin) ± 0.8(theory), for the proton polarisabilities, and α (s) E1 = 10.9 ± 0.9(stat) ± 0.2(Baldin) ± 0.8(theory), β (s)M 1 = 3.6 ∓ 0.9(stat) ± 0.2(Baldin) ± 0.8(theory), for the isoscalar polarisabilities, each in units of 10 −4 fm 3 . Finally, we discuss plans for polarised Compton scattering on the proton, deuteron, 3 He and heavier targets, their promise as tools to access spin polarisabilities, and other future avenues for theoretical and experimental investigation.

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Section: Deuteron Compton Scattering: Model Calculationsmentioning

confidence: 99%

Using Effective Field Theory to analyse low-energy Compton scattering data from protons and light nuclei

Grießhammer

McGovern

Phillips

et al. 2012

Progress in Particle and Nuclear Physics

168

353

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“…Although the first such measurements of elastic γd scattering were performed many years ago (see Ref. [14] and the references therein), only two recent experiments at Illinois at E γ = 49 and 69 MeV [15] and at SAL at E γ = 94 MeV [16] have been precise enough to reveal the effect of the nucleon polarizabilities. However, the values for α N − β N extracted from these measurements are inconsistent.…”

mentioning

confidence: 99%

Compton Scattering from the Deuteron and Extracted Neutron Polarizabilities

et al. 2003

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Differential cross sections for Compton scattering from the deuteron were measured at MAX-Lab for incident photon energies of 55 and 66 MeV at nominal laboratory angles of 45 degrees, 125 degrees, and 135 degrees. Tagged photons were scattered from liquid deuterium and detected in three NaI spectrometers. By comparing the data with theoretical calculations in the framework of a one-boson-exchange potential model, the sum and the difference of the isospin-averaged nucleon polarizabilities, alpha(N)+beta(N)=17.4+/-3.7 and alpha(N)-beta(N)=6.4+/-2.4 (in units of 10(-4) fm(3)), have been determined. By combining the latter with the global-averaged value for alpha(p)-beta(p) and using the predictions of the Baldin sum rule for the sum of the nucleon polarizabilities, we have obtained values for the neutron electric and magnetic polarizabilities of alpha(n)=8.8+/-2.4(total)+/-3.0(model) and beta(n)=6.5-/+2.4(total)-/+3.0(model), respectively.

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“Two-Photon Interactions” of Elementary Particles at Low Energies

Petrun'kin¹

1969

The Nucleon Compton Effect

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Elastic photon-deuteron scattering and the nucleon polarizability

Cited by 7 publications

References 19 publications

Using Effective Field Theory to analyse low-energy Compton scattering data from protons and light nuclei

Using Effective Field Theory to analyse low-energy Compton scattering data from protons and light nuclei

Compton Scattering from the Deuteron and Extracted Neutron Polarizabilities

“Two-Photon Interactions” of Elementary Particles at Low Energies

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