New measurement of the cosmic-ray positron fraction from 5 to 15 GeV.
Phys Rev Lett
; 93(24): 241102, 2004 Dec 10.
Article
en En
| MEDLINE
| ID: mdl-15697790
ABSTRACT
We present a new measurement of the cosmic-ray positron fraction at energies between 5 and 15 GeV with the balloon-borne HEAT-pbar instrument in the spring of 2000. The data presented here are compatible with our previous measurements, obtained with a different instrument. The combined data from the three HEAT flights indicate a small positron flux of nonstandard origin above 5 GeV. We compare the new measurement with earlier data obtained with the HEAT-e(+/-) instrument, during the opposite epoch of the solar cycle, and conclude that our measurements do not support predictions of charge sign dependent solar modulation of the positron abundance at 5 GeV.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2004
Tipo del documento:
Article
País de afiliación:
Estados Unidos