A parallel-plate avalanche counter for the prompt fission neutron spectrum measurement Article Swipe
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· 2021
· Open Access
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· DOI: https://doi.org/10.2172/1818391
· OA: W3200288057
Neutrons, gamma’s, and fission fragments are among the prompt fission observables. Their precision measurements are fundamental to advance our understanding of fission and any application of fission. For our programmatic need, the χ matrix, which defines as the outgoing neutron spectrum as a function of incoming neutron energy, is sparsely populated and poorly measured for <sup>233,235,238</sup>U and <sup>239,240</sup>Pu. To improve the quality of those χ matrices, a joint LANLLLNL project was undertaken to measure their prompt fission neutron spectra at the LANSCE/WNR facility using neutron detector arrays and a charged-particle detector for the fission-fragment detection. A typical setup is shown in Fig. 1, where one of neutron detector array with a charged-particle detector is given.
