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neutron flux
The neutron flux is a quantity used in nuclear reactor physics corresponding to the total length travelled by all neutrons per unit time and volume,〔Rudi J. J. Stamm'ler, Máximo Julio Abbate, Methods of steady-state reactor physics in nuclear design. ISBN 978-0126633207〕 or nearly equivalently number of neutrons travelling through a unit area in unit time.〔(Neutron flux ) from the United States Nuclear Regulatory Commission, retrieved 30 May 2008〕 The neutron fluence is defined as the neutron flux integrated over a certain time period.
==Natural neutron flux==
Neutron flux in asymptotic giant branch stars and in supernova is responsible for most of the natural nucleosynthesis producing elements heavier than iron. In stars there is a relatively low neutron flux on the order of 105 to 1011 neutrons per cm2 per second, resulting in nucleosynthesis by the s-process (slow-neutron-capture-process). By contrast, after a core-collapse supernova, there is an extremely high neutron flux, on the order of 1022 neutrons per cm2 per second, resulting in nucleosynthesis by the r-process (rapid-neutron-capture-process).
Atmospheric neutron flux, apparently from thunderstorms, can reach levels of 3•102 to 5•102 neutrons per cm2 per sec.〔
〕 However, recent results obtained with unshielded scintillation neutron detectors actually show a decrease in the neutron flux during thunderstorms.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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