Experimental tests of neutron shielding for the ATLAS forward region

Abstract

Experimental tests devoted to the optimization of the neutron shielding for the ATLAS forward region were performed at the CERN-PS with a 4 GeV/c proton beam. Spectra of fast neutrons, slow neutrons and gamma rays escaping a block of iron (40 40 80 cm 3 ) shielded with di erent t ypes of neutron and gamma shields (pure polyethylene -PE, borated polyethylene -BPE, lithium lled polyethylene -LiPE, lead, iron) were measured by means of plastic scintillators, a Bonner spectrometer, a HPGe detector and a slow neutron detector. E ectiveness of di erent t ypes of shielding against neutrons and -rays were compared. The idea of a segmented outer layer shielding (iron, BPE, iron, LiPE) for the ATLAS Forward Region was also tested.

Response of RadFET dosimeters to high fluences of fast neutrons

“…The Hydrogen contained in PE is slowing down neutrons, while the Lithium is capturing them via the reaction , that is not accompanied by gamma ray emission [20].…”