Isotopic composition of galactic cosmic-ray lithium, beryllium, and boron

Journal Article · Sat Nov 01 04:00:00 EST 1975 · Astrophys. J., Lett., v. 201, no. 3, pp. L145-L148

DOI:https://doi.org/10.1086/181962· OSTI ID:4100339

Garcia-Munoz, M; Mason, G M; Simpson, J A

The isotopes of cosmic-ray Li, Be, and B near 100 MeV per nucleon have been measured with cosmic-ray telescopes on board the IMP-7 and IMP-8 satellites during 1973--1974. The measured isotopic abundances provide a stringent test for models of interstellar propagation and solar modulation. It is found that the isotopic abundances can be explained using a steady-state interstellar propagation model with a 5 g cm$sup -2$ leakage mean free path. These results, taken along with our $sup 10$Be abundance measurements, indicate a longer lifetime for cosmic rays than that predicted by the usual assumption of an average interstellar density of 1 to 3 atoms cm$sup -3$. (AIP)

• Research Organization: Enrico Fermi Institute, Universiy of Chicago
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-017955
• OSTI ID: 4100339
• Journal Information: Astrophys. J., Lett., v. 201, no. 3, pp. L145-L148, Journal Name: Astrophys. J., Lett., v. 201, no. 3, pp. L145-L148; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

*COSMIC NUCLEI-- ISOTOPE RATIO
640101* --Physics Research--Astrophysics & Cosmology--Cosmic Radiation
BERYLLIUM 10
BERYLLIUM 7
BERYLLIUM 9
BORON 10
BORON 11
CARBON
CHEMICAL COMPOSITION
COSMIC GASES
COSMIC RAY FLUX
COSMIC RAY PROPAGATION
LITHIUM 6
LITHIUM 7
N56100* --Physics (Astrophysics & Cosmology)--Cosmic Radiation
NITROGEN
OXYGEN
SOLAR SYSTEM