Abstract
Differential cross-section data for the n-p and n-d elastic scattering (1H(n, el), 2H(n, el)) are collected and analyzed from EXFOR library. For En > 20 MeV, the experimental results for both reactions are scarce with large uncertainties and discrepancies in general. For En ≤ 20 MeV, the experimental results lack systematicness, most of which were measured around En = 14 MeV even though the differential cross sections of n-p scattering in 1 keV ≤ En ≤ 20 MeV region are recommended as standard. Taking these facts into account, more accurate and systematic measurements are planned. The experiments will be conducted using ΔE-E detectors of the Light-charged Particle Detector Array (LPDA) system at China Spallation Neutron Source (CSNS) Back-n White Neutron Source (WNS), and simulations are carried out. Using polyethylene and deuterated polyethylene as samples, both n-p and n-d scattering reactions are simulated along with the neutron-induced 12C background reactions, and the 2-D spectra and the counting rates of the ΔE-E detectors are obtained. According to the simulations, the applicable neutron energy range and positions of the detectors are recommended, and the beam time for the event and background measurements is suggested.
Highlights
The experiments for measuring the differential cross sections of n-p and n-d scattering reactions are planned at Chinese Spallation Neutron Source (CSNS) Back-n white neutron source (WNS)
Simulations of the measurements using Matlab are conducted. For both np and n-d elastic scattering, the samples prepared for the measurements are polyethylene and deuterated polyethylene of 100 μm and 32 μm in thickness, respectively, on which the simulations are based
The 2-D spectra of neutron energy (En) vs. the energy deposited in E detectors and the energy deposited in ∆E detectors vs. the energy deposited in E detectors are obtained along with the background, as well as counting rates of the ∆E-E detectors
Summary
The distance between the center of the sample and the center of the surface of the ∆E detector at 10◦ is 410 mm, while that of the ∆E-E detector at 15◦ is 290 mm so that these two detectors are not affected by the neutron beam halo. The sample for n-p scattering measurement is polyethylene (CH2). The measurement of the differential cross section of n-p scattering were already finished in May 13th, 2019, with 135 hours of beam time for foreground and 65 hours for background (C sample, 50 μm in thickness, 99.99% in purity) and empty target measurement. The CH2 sample used in the experiment is 100 μm in thickness to obtain good enough statistics and to minimize self-absorption. The sample for n-d scattering measurement is deuterated polyethylene (CD2) and it was already prepared 32 μm in thickness
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