THE ALPHA-PARTICLE COMPONENT OF THE PRIMARY COSMIC RADIATION OVER NORTHERN ENGLAND

Journal Article · Sat Apr 01 04:00:00 EST 1961 · Phil. Mag.

DOI:https://doi.org/10.1080/14786436108243328· OSTI ID:4839763

Stevenson, G R; Waddington, C J

Alpha particles of the primary cosmic radiation were studied in a stack of nuclear emulsions exposed over northern England on July 29, 1959. A fiux of 167 plus or minus 12 alpha particles/m/sup 2/ ster sec was found. The energy spectrum was examined between the cut-off energy of about 250 Mev per nucleon and an energy of 1.5 Bev per nucleon. It was not found to be significantly different from that observed during solar maximum. The energy spectrum was also examined as a function of zenith angle. An apparently significant linear relationship was established between neutron monitor counts recorded at sea level and primary alpha particle flux values. A value of 24.0 approximately 2.4 cm was determined for the mean free path of alpha -particles in nuclear emulsions, which is somewhat higher than previously reported values. (auth)

• Research Organization: Univ. of Bristol, Eng.
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-031479
• OSTI ID: 4839763
• Journal Information: Phil. Mag., Journal Name: Phil. Mag. Vol. Vol: (8), 6
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA PARTICLES
ANGULAR DISTRIBUTION
COSMIC RADIATION
DISTRIBUTION
ENERGY
ENERGY RANGE
GEOMAGNETIC CUT-OFF RIGIDITY
LEVELS
MEAN FREE PATH
MEASURED VALUES
MONITORING
NEUTRON DETECTION
NEUTRONS
NUCLEAR EMULSIONS
PARTICLE TRACKS
PHYSICS
PRIMARY COSMIC RADIATION
RADIATIONS
SEA
SEA LEVEL
SUN
VARIATIONS