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Study of the spring and autumn daemon-flux maxima at the Baksan Neutrino Observatory

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Detection of daemons in low-background conditions in September 2005 and March 2006 has provided supportive evidence for the maxima in the flux of daemons with V ≈ 10–15 km s − 1 , which hit the Earth from near-Earth almost-circular heliocentric orbits (NEACHOs) and which were expected to occur at those times. The ability of some FEU-167-1 photomultiplier tubes (PMTs) with a thicker inner aluminium coating to detect directly (without a scintillator) daemon passage through them has also been demonstrated, an effect giving a hundredfold increase in the detector efficiency. As a result, the daemon flux recorded at the maxima was increased from about 10 − 9 to about 10 − 7  cm − 2  s − 1 . At the maxima, two phases in the observed flux can be discriminated. The first of these is associated with objects which catch up with the Earth when moving in outer NEACHOs and cross it. The intensity and direction of the flux during this phase which lasts about 2 weeks depend on the time of day and latitude of observations (therefore, synchronous measurements in the northern and southern hemispheres of the Earth are desirable). In the second phase, where the flux consists primarily of a few objects captured into geocentric Earth-surface-crossing orbits during the first phase, the daytime and latitude dependences become less pronounced. The experiments suggest an explanation for the fairly poor reproducibility of our earlier ground-level measurements (subtle differences in PMT design, varying radon background, etc.). All the experimental results thus obtained either support the conclusions following from the daemon paradigm or find a simple interpretation within it.

Keywords: Black-hole physics; Dark matter; Detectors; Elementary particles

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/10556790600856366

Affiliations: 1: Ioffe Physico-Technical Institute, Russian Academy of Sciences, St Petersburg, 194021, Russia 2: Astronomical Department, Faculty of Mathematics and Mechanics, St Petersburg State University, Peterhof, St Petersburg, 198504, Russia

Publication date: February 1, 2006

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