Abstract
Fission fragment angular distributions can provide an important constraint on fission theory, improving predictive fission codes, and are a prerequisite for a precise ratio cross section measurement. Available anisotropy data are sparse, especially at neutron energies above 5 MeV. For the first time, a three-dimensional tracking detector is employed to study fragment emission angles and provide a direct measurement of angular anisotropy. The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has deployed the fission time projection chamber to measure nuclear data with unprecedented precision. The fission fragment anisotropy of U235 has been measured over a wide range of incident neutron energies from 180 keV to 200 MeV; a careful study of the systematic uncertainties complement the data.
| Original language | English |
|---|---|
| Article number | 064619 |
| Journal | Physical Review C |
| Volume | 99 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 28 2019 |
| Externally published | Yes |
Funding
This work benefited from the use of the LANSCE accelerator facility and was performed under the auspices of the US Department of Energy by Los Alamos National Security, LLC under Contract No. DE-AC52-06NA25396 and by Lawrence Livermore National Security, LLC under Contract No. DE-AC52-07NA27344. University collaborators acknowledge support for this work from the US Department of Energy Nuclear Energy Research Initiative Project No. 08-014, the US Department of Energy Idaho National Laboratory operated by Battle Energy Alliance under contract no. 00043028-00116, and the DOE-NNSA Stewardship Science Academic Alliances Program, under Award No. DE-NA0002921.