^(10)Be/^9Be ratio up to 1.0 GeV/nucleon measured in the ISOMAX 98 balloon flight
Abstract
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.
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.Attached Files
Published - 2001-19.pdf
Files
2001-19.pdf
Additional details
Identifiers
- Eprint ID
- 55413
- Resolver ID
- CaltechAUTHORS:20150302-113922419
Related works
- Describes
- http://adsabs.harvard.edu/abs/2001ICRC....5.1655H (URL)
Funding
- NASA
- NAG5-5227
- NASA
- RTOP 353-87-02
Dates
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2015-03-04Created from EPrint's datestamp field
- Updated
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2020-03-09Created from EPrint's last_modified field
Caltech Custom Metadata
- Caltech groups
- Space Radiation Laboratory
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 2001-19