PRIMARY COSMIC-RAY $alpha$-PARTICLES
Journal Article
·
· Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B
OSTI ID:4013265
The primary cosmic alpha -particle energy spectrum is investigated, using photographic emulsions exposed on July 3Oth, 1957. The total flux observed is (151 plus or minus 9) particles/cm/sup 2/. sr. sec. The differential energy spectrum shows a broad maximum between 400 and 600 Mev/nucleon, and appears different in shape from the spectrum observed at solar minimum. No particles are observed to have kinetic energies below 200 Mev/nucleon, but a substantial flux is observed between 200 and 300 Mev/nucleon. From the centered dipole approximation to the geomagnetic field, a cut-off energy is expected at this latitude of 292 Mev/nucleon. The results are in disagreement with this figure. (auth)
- Research Organization:
- Univ. of Rochester, N.Y.
- NSA Number:
- NSA-15-018641
- OSTI ID:
- 4013265
- Journal Information:
- Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B, Journal Name: Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B Vol. Vol: (10), 19; ISSN NUCIA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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