fornon-fissionable nuclei,it is the only possible absorption reaction. Capture reactions result in the loss of aneutroncoupled with the production of one or moregamma rays. This capture reaction is also referred to as aradiative captureor(n, γ) reaction, and itscross-sectionis denoted ...
Planetary ejection of these rocks has promoted an advance in the understanding of impact physics, which has been accomplished by a model involving spallation during large cratering events. Ejection of all the SNC meteorites (except ALH84001) in one or two events may provide a plausible solution ...
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like copper, are typically unstable after neutron capture and will beta-decay after some time. actually what i remember reading is that more cosmic ray neutrons are produced in the ground, by fast muon spallation, than in processes like 14 n (...
X-ray astronomy/ radioactive 26Al measurementHEAO 3 satelliteSince 1984 astrophysicists have speculated on the original source of the Al measured by the Al gamma radiation being observed might be coming from grains produced in nearby supernovae, or from cosmic-ray spallation reactions occurring on...
Cosmic-raysLocal interplanetary mediumSupernova remnantsSpallationSince 1984 astrophysicists have speculated on the original source of the Al-26 measured by the HEAO 3 satellite gamma-ray telescope. With a half-life of 717000 years it cannot be primordial, and the Sun cannot produce it. Possible ...