Fission fragment angular distributions measured with the fissionTPC

The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has built a fission time projection chamber (fissionTPC) to study the fission process in a novel way by reconstructing full three-dimensional tracks of fission fragments and other ionizing radiation.  While the ultimate goal of the fissionTPC is to measure fission cross section ratios to unprecedented precision, other physics can be studied concurrently with the cross section measurements.  Taking advantage of the fissionTPC's tracking ability, fission fragment angular distributions can be measured which is an important experimental observable for understanding the quantum mechanical state of the fissioning nucleus and a parameter required to determine detection efficiency for cross section measurements.  Additionally, the amount of linear momentum imparted to the fissioning nucleus by the incident neutron can be inferred by measuring the opening angle between the fission fragments.  Preliminary results for $^{235}$U fission fragment angular anisotropy and  neutron linear momentum transfer on fissioning $^{235}$U and $^{238}$U as a function of neutron energies in the range $130$~keV$ - 250$~MeV will be presented.