capture cross section

capture cross section

[′kap·chər ¦krȯs ′sek·shən]
(nuclear physics)
The cross section that is effective for radiative capture.
References in periodicals archive ?
The prompt gammas emitted from chlorine are considered as secondary standards for detector calibrations because of the high-thermal neutron capture cross section of chlorine and also because of the wide range of high-intensity gamma emissions up to 8.5 MeV [14].
At this point, only the interaction between nuclei [V.sup.nucl.sub.k] + [V.sup.nucl.sub.m] is therefore considered to calculate the capture cross section, since it dominates at small distance (r [??] 1 [Angstrom]) and because the long-range part of the atom-dark atom potential [V.sup.at.sub.k] + [V.sup.nucl.sub.m] is negligible and does not affect the initial diffusion eigenstate.
Because of (1), for each trap, the trap energy and the capture cross section are determined by its slope and intercept, respectively, may be determined from an Arrhenius plot ln([e.sub.n,p])~1/T.
[.sup.3]He has an extremely strong spin dependent capture cross section with essentially all capture in one spin state.
Another recent addition to our list of characterization techniques is thermally stimulated current measurements, which provide information about the energy, density and capture cross section of subband gap states.
Polarized [.sup.3]He spin filters are based on the spin dependence of the [.sup.3]He-neutron capture cross section. Because the two neutrons in the [.sup.4]He nucleus are spin paired, only neutrons of one spin state are absorbed by the [.sup.3]He nucleus.
It is connected with that the absorption coefficient of materials with a high capture cross section is sufficiently bigger for the low energy region and that the density of coated [.sup.6]LiF is 30% lower than the density of a LiF crystal [1].
Only neutrons with spin component antiparallel to the [.sup.3]He nuclear spin for which the capture cross section is very high ([sigma] [up arrow][down arrow] [barn] [approximately equal to] 6000 * [lambda] [[Angstrom]]) are absorbed in this reaction.
Polarized [.sup.3]He spin filters are based on the spin dependence of the [.sup.3]He-neutron capture cross section. For the [.sup.3]He spin parallel to the neutron spin, the thermal capture cross section is essentially zero, whereas for the spins anti-parallel, the cross section is 10 666 b at a neutron velocity v = 2200 m/s.
Another fundamental difference between SRH statistics and Sah-Shockley statistics is the possibility in the latter to have different capture cross sections for neutral and charged centers.
Malmkvist, "Electron capture cross sections of InAs/GaAs quantum dots," Applied Physics Letters, vol.