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Measurement of the Cosmic-Ray Be/B Ratio and the Age of Cosmic Rays

Brown, J. W. and Stone, E. C. and Vogt, R. E. (1973) Measurement of the Cosmic-Ray Be/B Ratio and the Age of Cosmic Rays. In: Proceedings of the 13th International Cosmic Ray Conference. Vol.1. Colorado Associated University Press , Denver, CO, pp. 484-489. https://resolver.caltech.edu/CaltechAUTHORS:20140409-085315609

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Abstract

The ratio Be/B depends on whether the confinement time of cosmic rays in the Galaxy is long or short compared to the radioactive half-life of ^(10)Be. We report observations of this ratio which were obtained with a dE/dx-Cerenkov detector launched into a polar orbit on OGO-6 as part of the Caltech Solar and Galactic Cosmic Ray Experiment. Be/B ratios were determined for various rigidity thresholds up to 15 GV. We find no statistically significant rigidity dependence of the ratio, which is 0.41 ± 0.02 when averaged over all observed cutoffs. When averaged over cutoffs ≥1.8 GV, the ratio is 0.43 ± 0.03, which can be compared directly to the ratio of 0.42 ± 0.06 calculated by O'Dell, Shapiro, Silberberg, and Tsao assuming ^(10)Be survival. Additional calculations suggest that if the present fragmentation parameters are correct, then the lifetime of cosmic rays in the Galaxy is < 10^7 y.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://adsabs.harvard.edu/full/1973ICRC....1..484BADSArticle
ORCID:
AuthorORCID
Stone, E. C.0000-0002-2010-5462
Contact Email Address:dmiles@caltech.edu
Additional Information:© 1973 University of Colorado. Provided by the NASA Astrophysics Data System. Dr. S. S. Murray made significant contributions to the OGO-6 program. Dr. J. Audouze kindly provided us with a copy of the computer program for the propagation calculation and provided us with cross section data. Dr. M. Shea kindly supplied us with detailed geomagnetic cutoff data, and Dr. T. L. Garrard supplied the solar modulation program. We appreciate discussions with Dr. C. Cesarsky. One of us (Brown) received support from the National Science Foundation, while another (Stone) was an Alfred P. Sloan research fellow. This work was supported in part by NASA contract NAS5-9312 and grant NGR 05-002-160.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
NASANAS5-9312
NASANGR 05-002-160
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1973-06
Record Number:CaltechAUTHORS:20140409-085315609
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140409-085315609
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44805
Collection:CaltechAUTHORS
Deposited By: SWORD User
Deposited On:14 Apr 2014 23:11
Last Modified:20 Feb 2020 14:33

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