Publications Details

Multi-depth Measurement of Fast Neutrons

Marleau, Peter M.; Gerling, Mark D.; Sweany, Melinda; Cabrera-Palmer, Belkis C.; Brennan, James S.

A spallation based multiplicity detector has been constructed and deployed to the Kimballton Underground Research Facility to measure the cosmogenic fast neutron flux anti-coincident from the initiating muon. Two of the three planned measurements have been completed (~380 and ~600 m.w.e) with sufficient statistics. The third measurement at level 14 (~4450 m.w.e.) is currently being performed. Current results at ~600 m.w.e. compare favourably to the one previous measurement at 550 m.w.e. For neutron energies between 100 and 200 MeV measurements at ~380 m.w.e. produce fluxes between 1e^-8 and 7e^-9 n/cm²/s/MeV and at ~600 m.w.e. measurements produce fluxes between 7e^-9 and 1e^-11 n/cm²/s/MeV.