Speaker
Description
The report briefly outlines the significance and background of this experimental study, the experimental setup, and the preliminary results. The 14N(n,p)14C reaction is the most significant poisoning reaction in the s-process nucleosynthesis. The measurement of its differential cross-section is crucial for producing 19F, determining neutron dose in boron neutron capture therapy (BNCT), estimating spin-parity of nuclear energy levels, and testing some nuclear models. Currently, there are discrepancies between existing experimental data and evaluated data, and there is a lack of differential cross-section data across the entire energy range. This experiment was conducted at CSNS Back-n, aiming to provide a scientifically robust supplement to the controversies and gaps in the nuclear data of this reaction. The result obtained in this experiment represent the first differential cross-section result in this energy region. During the experiment, neutron beams irradiated targets such as aluminum-backed C3H3N6 and aluminum-backed 6LiF, with signals detected by silicon detectors and data acquired by waveform digitizing electronics. The report provides a detailed description and explanation of the data analysis process and experimental results. After data processing and R-matrix fitting, the differential cross-section measurements were found to be consistent with the JENDL-5.0 evaluation within the error margins. The fitting results were consistent with the measurements and showed a distinct angular distribution in the 2.2~5.5 MeV range. Additionally, resonance parameters for approximately 40 14N+n resonances in the 0.1~6 MeV range were obtained from the fitting results, including the spin-parity of the 15N compound nucleus excited states and the reaction widths of the 14N+n, 14C+p, 15N+γ, and 11B+α reaction channels.
