AbstractThe Balloon Borne Experiment with a Superconducting Spectrometer (BESS) has measured the energy spectrum of cosmic-ray antiprotons between 0.18 and 4.20 GeV in eight flights between 1993 and 2002. Above about 1 GeV, models in which antiprotons are secondary products of the interactions of primary cosmic rays with the interstellar gas agree with the BESS antiproton spectrum. Below 1 GeV, the data show a possible excess antiproton flux compared to secondary model predictions, suggesting the presence of an additional source of antiprotons. The antiproton/proton ratios measured between 1993 and 1999, during the Sun’s positive-polarity phase, are consistent with simple models of solar modulation. However, results from the 2000 flight, following the solar magnetic field reversal, show a sudden increase in the antiproton/proton ratio and tend to favor a charge-sign-dependent drift model. To extend BESS measurements to lower energies, an evolutionary instrument, BESS-Polar, is under construction for polar flight in 2004.


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    Titel :

    Precise measurements of the cosmic ray antiproton spectrum with BESS including the effects of solar modulation


    Beteiligte:
    Mitchell, J.W. (Autor:in) / Abe, K. (Autor:in) / Anraku, K. (Autor:in) / Asaoka, Y. (Autor:in) / Fujikawa, M. (Autor:in) / Fuke, H. (Autor:in) / Haino, S. (Autor:in) / Hams, T. (Autor:in) / Ikeda, N. (Autor:in) / Imori, M. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 35 , 1 ; 135-141


    Erscheinungsdatum :

    2003-08-14


    Format / Umfang :

    7 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





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    Mitchell, J. W. / Abe, K. / Anraku, K. et al. | British Library Conference Proceedings | 2005


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    Nishimura, J. / Matsunaga, H. / Motoki, M. et al. | British Library Conference Proceedings | 1997