My Wish List for Detector Development Facilities 4/17 R.J. Tesarek - PowerPoint PPT Presentation

My Wish List for Detector Development Facilities 4/17 R.J. Tesarek

Neutrons 0.4 dN/dE (neutrons/MeV) Many experiments at Fermilab require 252 Cf → spontaneous fission understanding neutrons 0.35 • Mu2e N n /fission = 3.7 E n (peak) = 740 keV 0.3 • Neutrino experiments E n (mean) = 2.1 MeV Invest in neutron test facility (in addition to 0.25 Ref NNDC Reaction Data neutron irradiation facility): 0.2 ➡ Appropriately designed shielded room(s?) ➡ Neutron generator: 0.15 • commercially available 0.1 • well defined neutron energies E n = 2.45 MeV(DD), 14.1 MeV(DT) 0.05 • control flux/time structure of neutrons 0 (coincidence tagging for testing detectors) 0 2 4 6 8 10 12 14 16 18 20 Neutron Energy (MeV) . ➡ New 252 Cf source: FNAL currently has a single 252 Cf source • well defined/understood neutron energy Activation: 2.5 µCi spectrum 1.1e4 n/s over 4 π • AmBe/PuBe E n spectra depend on component 0.08 n/cm 2 /s @ 1m mixture/packing factors, etc. Desired Activation: 5,000 - 10,000 µCi • t 1/2 = 2.645 years (2.1 - 4.2)e7 n/s over 4 π (160 - 320) n/cm 2 /s @ 1m 2