Abstract
A new white neutron source, which can produce intense neutron fluxes with energies from less than 1 MeV to greater than 400 MeV, is being constructed at the Los Alamos National Laboratory. The neutrons are produced in a spallation reaction using the 800 MeV pulsed proton beam from the Los Alamos Meson Physics Facility (LAMPF) accelerator. This source is designed to allow several experiments to be run simultaneously. A gamma-ray detection system has been instrumented at 15 degrees with respect to the incident proton beam with a flight path of 18 m. The apparatus consists of five 7.6 cm long*7.6 cm diameter BGO scintillators which span an angular range from 40 degrees to 140 degrees in the reaction plane. Excitation functions and angular distributions of the 4.44 and 15.1 MeV gamma rays produced following the 12C(n,' gamma ) reaction have been measured in a preliminary run. Several gamma-ray experiments are planned for the coming run cycle including extending the data on the 40Ca(n, gamma ) reaction in the region of the isovector giant quadrupole resonance.
Published Version
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