The Anomalous Absorption of the Hard Component of Cosmic Rays in Air

1940 ◽  
Vol 57 (11) ◽  
pp. 945-950 ◽  
Author(s):  
M. Ageno ◽  
G. Bernardini ◽  
N. B. Cacciapuoti ◽  
B. Ferretti ◽  
G. C. Wick
Keyword(s):  
Cosmic Rays ◽  
Anomalous Absorption ◽  
Hard Component

scholarly journals Anomalous Absorption of Cosmic Rays in Lead

1953 ◽  
Vol 6 (4) ◽  
pp. 500
Author(s):  
WL Kennedy
Keyword(s):  
Cosmic Rays ◽  
Cosmic Radiation ◽  
Vertical Component ◽  
Absorption Curve ◽  
Anomalous Absorption ◽  
Lead Absorption ◽  
Series Of Experiments

Anomalies in the lead absorption curve of the vertical component of cosmic radiation have been reported by several authors using counter telescopes (Aiya 1944; George and Appapillai 1945; Swann and Morris 1947; Kellermann and Westerman 1949; Fenyves and Haiman 1950; Mazzolli de Mathov. 1951; Abd EI-Wahab Khalil 1952). However, in a recent detailed series of experiments, results of which were published as the experiment to be described here was nearing completion, Heyland and Duncanson (1953) found no evidence of any anomaly in the absorption curve.

The Variation of the Hard Component of Cosmic Rays with Height and the Disintegration of Mesotrons

1940 ◽  
Vol 57 (6) ◽  
pp. 461-469 ◽  
Author(s):  
Bruno Rossi ◽  
Norman Hilberry ◽  
J. Barton Hoag
Keyword(s):  
Cosmic Rays ◽  
Hard Component

scholarly journals The Integral and Differential Range Spectra of Sea-Level Mesons

1954 ◽  
Vol 7 (1) ◽  
pp. 49
Author(s):  
AJ Dyer
Keyword(s):  
Cosmic Rays ◽  
Sea Level ◽  
Momentum Spectrum ◽  
Hard Component ◽  
Integral Range

The differential and integral range spectra of the hard component of cosmic rays in water and lead have been determined up to a thickness of 1500 g cm?2 of water, and 2800 g cm?2 of lead. The differential results indicate that there is no anomaly with an intensity greater than 5 per cent. in the differential momentum spectrum in the region below 4 BeV/c.

The Hard Component of Cosmic Rays in the Upper Atmosphere

1952 ◽  
Vol 87 (1) ◽  
pp. 87-90 ◽  
Author(s):  
Malcolm A. Clark
Keyword(s):  
Cosmic Rays ◽  
Upper Atmosphere ◽  
Hard Component

METEOROLOGICAL EFFECTS ON COSMIC RAY INTENSITY AND THE MESON SPECTRUM

1951 ◽  
Vol 29 (2) ◽  
pp. 97-110 ◽  
Author(s):  
D. C. Rose
Keyword(s):  
Cosmic Rays ◽  
Canadian Arctic ◽  
Cosmic Ray ◽  
Atmospheric Conditions ◽  
Meson Spectrum ◽  
Hard Component ◽  
Cosmic Ray Intensity ◽  
Production Spectrum ◽  
Lead Shielding ◽  
Meteorological Effects

Continuous recording of the intensity of the hard component of cosmic rays has been carried out at Ottawa (Geomagnetic Lat. 56.8) and at Resolute (Geomagnetic Lat. 83) in the Canadian Arctic for over a year. Two counter telescopes with different amounts of lead shielding are used at each station. The results have been analyzed for barometer effect in four series of observations each extending over three months. When averaged, they show a barometer coefficient of –1.75% per cm. of mercury for mesons with momenta above 350 Mev./c and –2.13% per cm. of mercury for those with momenta above 630 Mev./c.A calculation has been made of the temperature and barometer effects. It was based on the variations in the probability of decay of mesons in the atmosphere, under varying atmospheric conditions. The calculations of the temperature effect do not yield results comparable with measurement; those of the barometer effect show that considerable information can be obtained about the meson spectrum from measurements of the barometer coefficients. The results favor a spectrum in agreement with parts of spectra measured by other authors. They suggest the possibility of a second maximum in the production spectrum of mesons.

scholarly journals The Diurnal Variation of the Barometer Coefficient for Cosmic Rays at Hobart

1956 ◽  
Vol 9 (4) ◽  
pp. 505
Author(s):  
RM Jacklyn
Keyword(s):  
Cosmic Rays ◽  
Diurnal Variation ◽  
Sea Level ◽  
Cosmic Radiation ◽  
Diurnal Variations ◽  
Hard Component ◽  
Secular Changes ◽  
The Mean ◽  
Counter Telescope

The records from a vertical counter telescope measuring the hard component of cosmic radiation at sea-level have disclosed significant diurnal variations of the barometer coefficient at Hobart, Tas. The amplitude of the variation is about 5 per cent., and there are secular changes of the same order during the mean day.

scholarly journals The Absorption of the Hard Component of Cosmic Rays in Water

1953 ◽  
Vol 6 (1) ◽  
pp. 60 ◽  
Author(s):  
AJ Dyer
Keyword(s):  
Cosmic Rays ◽  
Energy Loss ◽  
Recent Result ◽  
Satisfactory Agreement ◽  
Statistical Accuracy ◽  
Hard Component ◽  
Absolute Value ◽  
Loss Data ◽  
Momentum Spectra ◽  
Integral Range

The differential and integral range spectra of the hard component of cosmic rays in water have been measured down to a depth of 18�3 m. of water, and the integral results confirm the work of Ehmert (1937) and Wilson (1938) in this region. A lack of statistical accuracy in the differential measurements prevents the possible observation of an anomaly corresponding to 2�5 BeV./c. momentum. A comparison of the range and momentum spectra on the basis of the energy loss data of Halpern and Hall shows satisfactory agreement. The absolute value of the differential intensity is found to be 20 per cent. higher than that given by Rossi (1948) but agrees with the more recent result of York (1952).

On the Hard Component of Cosmic Rays

1936 ◽  
Vol 50 (12) ◽  
pp. 1188-1189
Author(s):  
B. Gross
Keyword(s):  
Cosmic Rays ◽  
Hard Component
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