Nuclear Compton scattering

Christillin, P.

doi:10.1088/0305-4616/12/9/008

Cited by 29 publications

(19 citation statements)

References 17 publications

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“…An interesting feature of nuclear Compton scattering below meson photoproduction threshold which has been realized very early is its strong sensitivity to meson exchange currents (MEC) between nucleons [67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83]. In this respect Compton scattering is of essential superiority to electron scattering at similar momentum transfers which is to a large extent insensitive to this phenomenon.…”

Section: Motivations For Studying Nuclear Compton Scatteringmentioning

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: Motivations For Studying Nuclear Compton Scatteringmentioning

confidence: 99%

“…In a nonrelativistic description [81,121,130,175,176] the interaction between a nucleon and an electromagnetic field is given by the Hamiltonian…”

Section: The Nonrelativistic Photon-nucleus Interaction and The Concementioning

confidence: 99%

Compton scattering by nuclei

et al. 2000

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“…Here one could correlate increased mass to the gain of energy in Newton's second law i.e, so, and Newton's second law could be rewritten as, (46) When a particle loses energy such as inverse of Compton scattering, , particle reduces a part of its mass (Moskalenko, Porter, & Digel, 2006), if a particle takes energy such as Compton scattering dE > 0 its mass increases (Christillin, 1986). The relativistic mass uses in high energies just for showing the speed limit in quantum equations while for well-known subatomic particles always , in this order only the given energy by particles must be considered and there no need to use the relativistic mass relation.…”

Section: Newton's Second Law and Sub Quantum Energymentioning

confidence: 99%

Interactions Between Real and Virtual Space times

Javadi

Forouzbakhsh

2014

IJFPS

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Here arise the problems of modern physics that theories at the quantum scales have been discontinued. Therefore we should pass through the quantum scales and review phenomena at the sub quantum levels. The question is where to enter the sub quantum levels? Answer is; open a new window for massive photons. The reason this answer is that although there are theoretical reasons to accept that the photon is a massless particle. The massless particle is an assumption, also a long series of very different experiments lead to the current experimental upper bound on the photon mass greater than zero. In this article, we analyzed that c is the edge of visible and invisible particles such as virtual photons and graviton. It leads us passing the real spacetime and enter into the virtual spacetime and describe interactions between real spacetime and virtual spacetime and reach to non-obvious space.

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“…This is due to the Compton effect where photons scatter in the breast tissue and turn in to photons with lower energy contents. 16 In the present study variable 125 I-activities, tracer protocols, and 3 gamma-probes are evaluated in an in vitro study to analyse the interference between the two isotopes, and thereby, to make sure the tumour is excised based on the activity of the seed and not by the depot of 99m Tc-nanocolloid. Hereafter, this topic is described in patients with nonpalpable breast lesions in which both an 125 I-seed and an injection of 99m Tc-nanocolloid are placed in the centre of the lesion for combined RSL and SNB.…”

Section: Introductionmentioning

confidence: 99%