This communication presents some experimental results that seem to indicate that the barometric pressure coefficient customarily employed to correct terrestrial neutron monitor intensities is subject to variations in magnitude that are apparently related to changes of atmospheric water vapor content above the site of measurement.
An aluminum container was placed above one section of the IGY standard neutron monitor at the University of Denver, Denver, Colorado (1600‐meter altitude, 2.93 Gv/c Quenby‐Wenk threshold). The container was filled to different depths of water for various intervals of time, and the corresponding attenuation of the nucleonic intensity was determined. Preliminary results of a statistically reliable nature have been obtained for four different water levels. The results are indicated m the table below.
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