The production of neutrons and protons by the cosmic radiation at 14,125 feet

A u g . , I942.1 THE

THF

BARTOL

RI"SEAaCH FOUNDATmX.

195

P R O D U C T I O N OF N E U T R O N S AND P R O T O N S BY T H E C O S M I C RADIATION AT I4,I25 F E E T . * BY S. A. K O R F F

AND E. T. CLARKE.

The production of neutrons and protons in various substances by the cosmic radiation was investigated with proportional counters at the Mt. E v a n s Laboratory (barometer 46 cm.). Neutrons were studied with counters filled with BFa and cadmium absorbers. The neutron counter was surrounded by water, so that n e a r l y all the neutrons should be slow, and also so that the neutrons measured should n e a r l y all have been produced in the water, very few of those produced elsewhere reaching the counter. Protons were observed in counters filled with CH4. The size distribution of ionizing events was determined. Coincidences between neutron counts and shower counts were observed, suggesting a connection between the neutrons and the soft component. Estimates are given of the rates of production in various substances, these being of the o r d e r of Io-a to IO-) per gram per second on Mt. Evans. ON

T H E E L E C T R I C A L AND ANOMALOUS OF M E S O T R O N S . *

SCATTERING

BY RALPH

P. SHUTT.

Photographs obtained without a magnetic field in a large counter-controlled cloud c h a m b e r containing lead plates of two different thicknesses have been analyzed in regard to the scattering of the mesotrons in lead. The theory of scattering developed by E. J. Williams has been used. The m a t h e matical form of this t h e o r y makes it possible to eliminate the energy distribution of the mesotrons in comparing the observed scattering intensity in two lead thicknesses. The scat* An abstract of a p a p e r which was p u b l i s h e d in fullin 61,422 0 9 4 2 ) . * An abstract of a p a p e r which was p u b l i s h e d in fullin 6 i , 6 (1942).

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