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It is well known that two fission fragments (FF's) are emitted essentiallyback to back in the laboratory frame. That can be used widely in manyapplications as a unique signature of fissionable materials. However, suchfission fragments are difficult to detect. The energy and angular distributionsof neutrons, on the other hand, are easy to measure, and that distribution willcarry information about the fission fragment's energy and angular spectra, aswell as the neutron spectra in the fission fragment rest frame. We propose toinvestigate the two neutron correlation yield resulting from two FF's as afunction of different targets, the angle between the two neutrons and theneutron energies. The preliminary calculation of the two neutron correlationshows a huge asymmetry effect: many more neutrons are emitted anti-parallel toeach other than parallel to each other. That asymmetry becomes even more if theenergy cut on each neutron is done. This study will potentially permit a newtechnique for actinide detection for homeland security and safeguardsapplications as well as improve our knowledge of correlated neutron emission.

Two Neutron Correlation Study in Photofission of Actinides