Ames Collaborative Study of Cosmic Ray Neutrons
نویسندگان
چکیده
منابع مشابه
Ecosystem-scale measurements of biomass water using cosmic ray neutrons
[1] Accurate estimates of biomass are imperative for understanding the global carbon cycle. However, measurements of biomass and water in the biomass are difficult to obtain at a scale consistent with measurements of mass and energy transfer, ~1 km, leading to substantial uncertainty in dynamic global vegetation models. Here we use a novel cosmic ray neutron method to estimate a stoichiometric ...
متن کاملTime Delays in Cosmic Ray Propagation
Cosmic Rays (CR) travel at speeds essentially indistinguishable from the speed of light. However whilst travelling through magnetic fields, both regular and turbulent, they are delayed behind the light since they are usually charged particles and their paths are not linear. Those delays can be so long that they are an impediment to correctly identifying sources which may be variable in time. Fu...
متن کاملA universal calibration function for determination of soil moisture with cosmic-ray neutrons
A cosmic-ray soil moisture probe is usually calibrated locally using soil samples collected within its support volume. But such calibration may be difficult or impractical, for example when soil contains stones, in presence of bedrock outcrops, in urban environments, or when the probe is used as a rover. Here we use the neutron transport code MCNPx with observed soil chemistries and pore water ...
متن کاملTime correlation of cosmic-ray-induced neutrons and gamma rays at sea level
The neutrons and gamma rays produced by cosmic ray interactions in spallation and evaporation processes of air nuclei are time-correlated. The occurrence of their counts in a fixed time interval is not a random (Poisson) distribution, but rather time-correlated bursts of counts. A computational model is developed to explore time correlations of cosmic-ray-induced background of neutrons and gamm...
متن کاملTime and other Variations in the Intensity of Cosmic Ray Neutrons
We have measured the barometer coefficient of cosmic ray neutron production at sea level and find the value —9,25% ± 0,20/cmHg. We have shown that there is no diurnal variation of neutron production of amplitude greater than about 0,4 %. The effects of the large solar flare of November 19th, 1949 on cosmic ray neutrons were much greater than on ionising cosmic rays at sea level; the maximum fac...
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ژورنال
عنوان ژورنال: Health Physics
سال: 1978
ISSN: 0017-9078
DOI: 10.1097/00004032-197804000-00008