Neutron Monitor
The Plateau de Bure Neutron Monitor (PdBNM) has been operational on site since July 23, 2008. This new scientific instrument provides real-time data about the mean neutron flux (induced by cosmic rays) incident on the ASTEP platform. This information is of prime importance in SER experiments to correlate soft-error occurence and neutron flux variations exactly measured at the same location.
PdBNM complete data can be downloaded from this section (monthly files).
Documents published in this section
Geant4 Simulation of the Plateau de Bure Neutron Monitor
The calculation of the PdBNM response functions is being in progress
In the framework of a scientific collaboration between IM2NP laboratory in Marseille, France (the ASTEP operator) and the Joint Institute for Nuclear Research in Dubna, Russia (Dzhelepov Laboratory of Nuclear Problems), the numerical simulation under Geant4 of the Plateau de Bure Neutron Monitor has been conducted since these last months. The aim of this study is to establish the relationship between the counting rate and the complex primary flux composed of not only neutrons, but also muons, pions and protons. The complete response functions of the instrument (i.e. the calculated (...)
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HOURLY DATA FOR AUGUST 2008 TO APRIL 2009
Time corrected to UTC
These are XLS Monthly files of Hourly Data for the month of August 2008 to April 2009 with time corrected to UTC.
For the corrected data versus pressure, barometric response of PdBNM was calculated on 99 days.
; Barometric response at ASTEP Plateau de Bure ; (2555m); Average pressure P0 in mbar ; 749.2; Count per hour at P0 ; 314776; Barometric coefficient in %/mbar ; 0.6642; Acceleration factor vs. Marseille ; 6.77; Acceleration factor vs. NY; 6.37 (...)
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The Plateau de Bure Neutron Monitor (PdBNM) is operational
Since July 23, 2008 and in complement to SER testing facilities, ASTEP has been now providing in situ real-time neutron monitoring using a super 3-NM64 neutron monitor installed in a new extension of the ASTEP building (Fig. 1).
The Plateau de Bure Neutron Monitor (PdBNM) is composed of three high pressure (2280 Torr) cylindrical LND He3 detectors surrounded by lead rings and a polyethylene box (Fig. 2). Assembled and previously operated in Marseille during the year 2007-2008, the PdBNM allowed us to experimentally determine the acceleration factor (AF) of the ASTEP location from its (...)
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Atlantic storm Klaus increases neutron flux at ground level!
(Image Meteo-France)
The winter storm, called Klaus, that passed through southern France and northern Spain in the day on Saturday 24 January 2009, has caused very significant damages....and a dramatic drop in air pressure on its way during several hours.
This sudden decrease of the air pressure mechanically induced a dramatic increase of the atmospheric neutron flux at ground level, as recorded by the Plateau de Bure Neutron Monitor (PdBNM).
The picture below shows a peak approaching +30% in the averaged neutron flux with respect to standard conditions (usually around 300000 counts/h). (...)
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