Search results
Results from the WOW.Com Content Network
A gamma ray cross section is a measure of the probability that a gamma ray interacts with matter. The total cross section of gamma ray interactions is composed of several independent processes: photoelectric effect, Compton (incoherent) scattering, electron-positron pair production in the nucleus field and electron-positron pair production in the electron field (triplet production).
English: Plot showing the relative importance of the photoelectric effect, Compton scattering and pair production with different Z and mean photon energy. Data taken from the NIST XCOM database. For any given element (atomic number Z) a star is added at the energy where the cross section value for the process on the right becomes larger than ...
Pair production is the creation of a subatomic particle and its antiparticle from a neutral boson. Examples include creating an electron and a positron, a muon and an antimuon, or a proton and an antiproton. Pair production often refers specifically to a photon creating an electron–positron pair near a
Compton scattering and pair production are examples of two other competing mechanisms. [ citation needed ] Even if the photoelectric effect is the favoured reaction for a particular interaction of a single photon with a bound electron, the result is also subject to quantum statistics and is not guaranteed.
Pair production and the Compton effect occur at the level of the electron. [1] When a high frequency photon scatters due to an interaction with a charged particle, there is a decrease in the energy of the photon and thus, an increase in its wavelength. This tradeoff between wavelength and energy in response to the collision is the Compton effect.
A Feynman diagram (box diagram) for photon–photon scattering: one photon scatters from the transient vacuum charge fluctuations of the other. Two-photon physics, also called gamma–gamma physics, is a branch of particle physics that describes the interactions between two photons. Normally, beams of light pass through each other unperturbed.
For highly energetic photons such as X-rays (0.1 keV < < 100 keV) and γ-rays (> 100 keV), three types of interactions are responsible for the energy conversion process in scintillation: photoelectric absorption, [6] Compton scattering, [7] and pair production, [8] which only occurs when > 1022 keV, i.e. the photon has enough energy to create ...
The most important interaction mechanisms are the photoelectric effect, the Compton effect, and pair production. Through these processes, the energy of the gamma ray is absorbed and converted into a voltage signal by detecting the energy difference before and after the interaction [ citation needed ] (or, in a scintillation counter , the ...