Direct measurement of the atmospheric neutron flux in the energy range 10-500 MeV

Details Direct measurement of the atmospheric neutron flux in the energy range 10-500 MeV Direct measurement of the atmospheric neutron flux in the energy range 10-500 MeV

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aph....34..225b&link_type=abstract

Astroparticle Physics, Volume 34, Issue 4, p. 225-229.

Physics

1

Scientific paper

The results of a direct measurement of the atmospheric neutron flux in the energy range 10-500 MeV performed at 42°25′11″ N, 13°31′2″ E, rigidity cutoff 6.3 GV, altitude 970 m a.s.l. (LNGS external site) on November 2008, during minimum solar activity, are reported. The detector consists of a 1.5 × 1 × 1 m3 stainless steel tank filled with 1.2 tons of 0.1% Gd doped liquid scintillator, monitored by three photomultipliers and surrounded by a 4π active muon veto. The measurement is performed by observing events formed by two un-vetoed pulses inside a temporal window 95 μs long: the first one due to a recoiling proton scattered by a neutron, the second one due to the neutron capture (n, Gd). The resulting atmospheric neutron fluxes are: Φ(E>10MeV)=47±5neutronss-1m-2;Φ(E>20MeV)=42±4neutronss-1m-2.

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