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Neutron capture is a nuclear reaction in which an atomic nucleus and one or more neutrons collide and merge to form a heavier nucleus. [1] Since neutrons have no electric charge, they can enter a nucleus more easily than positively charged protons , which are repelled electrostatically .
Neutron capture nucleosynthesis describes two nucleosynthesis pathways: the r-process and the s-process, for rapid and slow neutron captures, respectively. R-process describes neutron capture in a region of high neutron flux , such as during supernova nucleosynthesis after core-collapse, and yields neutron-rich nuclides .
Neutron capture therapy was first proposed in the literature in 1936 by Gordon L. Locher, who observed that isotopes with large neutron capture cross sections, such as boron-10, could be accumulated in cancerous tissue and bombarded with thermal neutrons to induce destruction of the cancerous cells. [4]
In nuclear astrophysics, the rapid neutron-capture process, also known as the r-process, is a set of nuclear reactions that is responsible for the creation of approximately half of the atomic nuclei heavier than iron, the "heavy elements", with the other half produced by the p-process and s-process.
The term p-process (p for proton) is used in two ways in the scientific literature concerning the astrophysical origin of the elements (nucleosynthesis).Originally it referred to a proton capture process which was proposed to be the source of certain, naturally occurring, neutron-deficient isotopes of the elements from selenium to mercury.
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The section "Capture cross section" states that, "the effective cross sectional area that an atom of that isotope presents to absorption... is a measure of the probability of neutron capture." It seems that it would help less technical readers if this article would explain this phenomenon in the narrative, in terms of which of the lightest ...
A Bảo Đại period document issued by the Imperial Clan Court which mentions the Tết Trung Thu. Tết Trung Thu originated from Chinese culture, with three main legends that are associated with the festival: the story of Chang'e and Hou Yi, Emperor Tang Ming Huang's ascent to the moon in China, and the story of Uncle Cuội of Vietnam.