Neutron Induced Fission Fragment Angular Distributions, Anisotropy, and Linear Momentum Transfer Measured with the NIFFTE Fission Time Projection Chamber

Abstract

The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has performed measurements with a fission time projection chamber (fissionTPC) to study the fission process by reconstructing full three-dimensional tracks of fission fragments and other ionizing radiation. 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. Using this measured linear momentum, fission fragment angular distributions can be converted to the center-of-mass frame for anisotropy measurements. Angular anisotropy is an important experimental observable for understanding the quantum mechanical state of the fissioning nucleus and vital to determining detection efficiency for cross section measurements. Neutron linear momentum transfer to fissioning ${}^{235}$U, ${}^{238}$U, and ${}^{239}$Pu and fission fragment angular anisotropy of ${}^{235}$U and ${}^{238}$U as a function of neutron energies in the range 130 keV--250 MeV are presented.

References in corpus (6)

• Towards a More Complete and Accurate Experimental Nuclear Reaction Data Library (EXFOR): International Collaboration Between Nuclear Reaction Data Centres (NRDC)
• A Time Projection Chamber for High Accuracy and Precision Fission Cross Section Measurements
• Measurement of the normalized ${}^{238}$U(n,f)/${}^{235}$U(n,f) cross section ratio from threshold to 30 MeV with the fission Time Projection Chamber
• Fission Fragment Angular Anisotropy in Neutron-Induced Fission of ${}^{235}$U Measured with a Time Projection Chamber
• Performance of a MICROMEGAS-based TPC in a high-energy neutron beam
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Cited by in corpus (4)

• Fission Fragment Decay Simulations with the CGMF Code
• Recoil Proton Telescopes and Parallel Plate Avalanche Counters for the ${}^{235}$U(n,f) cross section measurement relative to H(n,n)H between 10 and 450 MeV neutron energy
• Measurement of the ${}^{236}$U fission cross section and angular distributions of fragments from fission of ${}^{235}$U and ${}^{236}$U in the neutron energy range of 0.3-500 MeV
• The fast neutron induced fission of ${}^{240}$Pu and ${}^{242}$Pu