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Observation of the 511 keV annihilation line in the direction of the galactic center with HEXAGONE

 

作者: C. G. L. Chapuis,   P. Wallyn,   Ph. Durouchoux,   J. Matteson,   M. Pelling,   B. Bowman,   M. Briggs,   D. Gruber,   L. Peterson,   C. Cork,   D. Landis,   P. Luke,   N. Madden,   D. Malone,   R. Pehl,   M. Pollard,   R. Lin,   D. Smith,   P. Feffer,   K. Hurley,   G. Vedrenne,   M. Neil,   P. V. Ballmoos,   I. Malet,  

 

期刊: AIP Conference Proceedings  （AIP Available online 1991）
卷期: Volume 232, issue 1  

页码: 52-57

 

ISSN:0094-243X

 

年代: 1991

 

DOI:10.1063/1.40897

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The HEXAGONE balloon‐borne spectrometer has flown on 22 May 1989. HEXAGONE is a high resolution gamma‐ray spectrometer and consists of an array of twelve cooled germanium detectors. One of the observed targets was the Galactic Center and its vicinity (field of view 19° at 511 keV) and it was seen during 6.3 hours. The 511 keV annihilation line was observed with a flux of (8.88±2.67)×10−4&ggr;cm−2 s−1, a width 1.09+1.38, −1.09 keV and its centroid at 511.54±0.38 keV. The results are consistent with an upper limit of 8.3×104K for the temperature of the annihilation medium of the positrons.

 

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