Relative abundance of the helium isotopes /sup 3/He and /sup 4/He in the cosmic radiation
Journal Article
·
· Phys. Rev. Lett.; (United States)
The geomagnetic field near the equator is used to measure the abundance ratio of /sup 3/He//sup 4/He near 6 GeV/nucleon. This ratio is found to be 0.24 +- 0.05, under the assumption that the helium rigidity spectrum has the form dI/dRapprox.R/sup -2.65/. If all /sup 3/He, is of secondary origin this implies an interstellar mean escape path length of roughly-equal15 g/cm/sup 2/, a value considerably larger than that determined from observations of heavier elements, but compatible with measurements of the helium isotopic ratio at lower energies.
- Research Organization:
- Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637
- OSTI ID:
- 6534575
- Journal Information:
- Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 53:5; ISSN PRLTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640101* -- Astrophysics & Cosmology-- Cosmic Radiation
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC NUCLEI
COSMIC RADIATION
COSMIC RAY PROPAGATION
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GEOMAGNETIC FIELD
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
IONIZING RADIATIONS
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
MAGNETIC FIELDS
MEAN FREE PATH
NUCLEI
RADIATIONS
STABLE ISOTOPES
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC NUCLEI
COSMIC RADIATION
COSMIC RAY PROPAGATION
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GEOMAGNETIC FIELD
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
IONIZING RADIATIONS
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
MAGNETIC FIELDS
MEAN FREE PATH
NUCLEI
RADIATIONS
STABLE ISOTOPES