Title

The search for cosmic strangelets with the supersonic concorde and with JACEE's circumpolar balloon flight in Antarctica

Document Type

Article

Publication Date

1-1-1996

Abstract

The search for cosmic strangelet nuclei was carried out by two experiments with emulsion chambers. A balloon-borne JACEE emulsion chamber was flown at 3.5 g/cm2 for 200 h in Antarctica (JACEE-10 experiment) and the Concorde flights were made by ECHOS at an atmospheric depth of 110 g/cm2 between Paris and New York. No nuclei with Z ≥ 30 survived after traversing 60-120 g/cm2 of the detector materials in the JACEE instruments. No evidence for a long mean free path were found in the zenith angle distribution for Z/β ≥ 26 nuclei. The exposure factor used by the JACEE was 72 m2 h sr. The intensity upperbounds, I ≤ (2.2-9.7) × 10-2/m2 h sr, were obtained for strangelets having an atmospheric attenuation length of 220-50 g/cm2, which corresponds to the case for mass number A = 100-10000 and Z/β ≥ 13. Concorde experiments (ECHOS) used both a thin and a thick emulsion chamber. The total exposure was 209 m2 h sr and no candidates with charge Z ≥ 30 were found. The largest track had Z/β = 28.6 ± 1.29 with β ∼ 1. Nuclei observed with charge 13 ≤ Z ≤ 30 were consistent with the survival intensity of ordinary nuclei. The flux bounds from the ECHOS experiments were I ≤ (2.1-5.0) × 10-2/m2 h for strangelets with mass number 100≤A≤1000. © J.C. Baltzer AG, Science Publishers.

Publication Source (Journal or Book title)

Hyperfine Interactions

First Page

99

Last Page

111

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