A Search for Antimatter in the Cosmic Rays

Details A Search for Antimatter in the Cosmic Rays A Search for Antimatter in the Cosmic Rays

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt........10g&link_type=abstract

Thesis (PHD). BOSTON UNIVERSITY , Source DAI-B 57/07, p. 4452, Jan 1997, 259 pages.

Computer Science

Helium, Lithium, Beryllium, Boron

Scientific paper

This work concerns the study of the composition of cosmic rays with two balloon-borne instruments, SMILI (Superconducting Magnetic Instrument for Light Isotopes), and MAGPIE (MAGnetic Passive Isotope Experiment). The principal result of this thesis is a new upper limit on the fraction of antihelium in the cosmic rays. This result, based on a sample of 16,000 helium events, limits the amount of antimatter that can be present in our Galaxy. Also presented are new data analysis techniques that have been developed to determine the masses of the light cosmic ray nuclei (lithium, beryllium, and boron) with unprecedented precision. In addition, this thesis contains a description of the analysis of nuclear tracks in the detectors of MAGPIE, a prototype apparatus flown from Antarctica to explore novel techniques for improved measurements of cosmic ray composition.

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