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^(10)Be/^9Be ratio up to 1.0 GeV/nucleon measured in the ISOMAX 98 balloon flight

Hams, T. and Barbier, L. M. and Bremerich, M. and Christian, E. R. and deNolfo, G. A. and Geier, S. and Gobel, H. and Gupta, S. K. and Hof, M. and Menn, W. and Mewaldt, R. A. and Mitchell, J. W. and Schindler, S. M. and Simon, M. and Streitmatter, R. E. (2001) ^(10)Be/^9Be ratio up to 1.0 GeV/nucleon measured in the ISOMAX 98 balloon flight. In: Proceedings of the 27th International Cosmic Ray Conference. Vol.5. Copernicus Systems and Technology GmbH , Berlin, Germany, pp. 1655-1660.

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The Isotope Magnet Experiment, ISOMAX, a balloon-borne superconducting magnet spectrometer was built with the capability to measure the isotopic composition of the light isotopes (3 ≤ Z ≤ 8) of the cosmic radiation up to 4 GeV/nucleon by using the β vs. rigidity technique with a mass resolution better than 0.25 amu, employing a combination of time-of-flight (TOF) system and silica-aerogel Cherenkov counters for the velocity determination. One of the primary scientific goals of ISOMAX was the accurate measurement of radioactive 10 Be with respect to its stable neighbor isotope 9 Be conveying information on the age of the cosmic rays in the galaxy. ISOMAX had its first flight on August 4-5, 1998, from Lynn Lake, Manitoba, Canada. It provided 13 h of data with a residual atmosphere of less than 5 g/cm^2 . This paper reports the results of the beryllium ratio 10 Be/9 Be = 0.195 ± 0.036 at the top of atmosphere in the energy range from 0.261 - 1.030 GeV/nucleon using the TOF in the 1998 flight. The high energy results of the beryllium ratio up to 2 GeV/nucleon in the Cherenkov regime as well as the lithium results in the TOF energy range are also reported in these proceedings.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Christian, E. R.0000-0003-2134-3937
Geier, S.0000-0002-3948-9339
Hof, M.0000-0003-2884-3037
Mewaldt, R. A.0000-0003-2178-9111
Additional Information:© Copernicus GmbH. This experiment was supported by grant NASA RTOP 353-87-02 at Goddard, by NAGS-5227 at CalTech, and by DFG Si 290/8 at University of Siegen, Germany. We would like ro thank the many engineers and technicians that maid ISOMAX a success as well as the Nacional Scientific Balloon Facility.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASARTOP 353-87-02
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2001-19
Record Number:CaltechAUTHORS:20150302-113922419
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55413
Deposited By: Deborah Miles
Deposited On:04 Mar 2015 17:34
Last Modified:09 Mar 2020 13:18

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