Measurements of differential and angle-integrated cross sections for the ¹⁰B(n,)⁷Li reaction in the neutron energy range from 1.0 eV to 2.5 MeV

Differential and angle-integrated cross sections for the ¹⁰B(n, )⁷Li, ¹⁰B(n, ₀) ⁷Li and ¹⁰B(n, ₁) ⁷Li^∗ reactions have been measured at CSNS Back-n white neutron source. Two enriched (90%) ¹⁰B samples 5.0 cm in diameter and ∼85.0 μg/cm² in thickness each with an aluminum backing were prepared, and back-to-back mounted at the sample holder. The charged particles were detected using the silicon-detector array of the Light-charged Particle Detector Array (LPDA) system. The neutron energy E_n was determined by TOF (time-of-flight) method, and the valid events were extracted from the E_n-Amplitude two-dimensional spectrum. With 15 silicon detectors, the differential cross sections of -particles were measured from 19.2° to 160.8°. Fitted with the Legendre polynomial series, the (n, ) cross sections were obtained through integration. The absolute cross sections were normalized using the standard cross sections of the ¹⁰B(n, )⁷Li reaction in the 0.3-0.5 MeV neutron energy region. The measurement neutron energy range for the ¹⁰B(n, )⁷Li reaction is 1.0 eV≤E_n < 2.5 MeV (67 energy points), and that for the ¹⁰B(n, ₀) ⁷Li and ¹⁰B(n, ₁) ⁷Li^∗ reactions is 1.0 eV ≤ E_n < 1.0 MeV (59 energy points). The present results have been analyzed by the resonance reaction mechanism and the level structure of the ¹¹B compound system, and compared with existing measurements and evaluations.