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.
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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 |
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| Contact Email Address: | dmiles@caltech.edu |
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| 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. |
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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| NSF | UNSPECIFIED | | Alfred P. Sloan Foundation | UNSPECIFIED | | NASA | NAS5-9312 | | NASA | NGR 05-002-160 |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 1973-06 |
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| Record Number: | CaltechAUTHORS:20140409-085315609 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140409-085315609 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 44805 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
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| Deposited On: | 14 Apr 2014 23:11 |
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| Last Modified: | 20 Feb 2020 14:33 |
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