  Differential and angle-integrated cross sections for the $^{10}$B($n,
{\alpha}$)$^{7}$Li, $^{10}$B($n, {\alpha}$$_{0}$)$^{7}$Li and $^{10}$B($n,
{\alpha}$$_{1}$)$^{7}$Li$^{*}$ reactions have been measured at CSNS Back-n
white neutron source. Two enriched (90%) $^{10}$B samples 5.0 cm in diameter
and ~85.0 ${\mu}$g/cm$^{2}$ 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 ${\alpha}$ events were extracted from
the E$_{n}$-Amplitude two-dimensional spectrum. With 15 silicon detectors, the
differential cross sections of ${\alpha}$-particles were measured from
19.2{\deg} to 160.8{\deg}. Fitted with the Legendre polynomial series, the ($n,
{\alpha}$) cross sections were obtained through integration. The absolute cross
sections were normalized using the standard cross sections of the $^{10}$B($n,
{\alpha}$)$^{7}$Li reaction in the 0.3 - 0.5 MeV neutron energy region. The
measurement neutron energy range for the $^{10}$B($n, {\alpha}$)$^{7}$Li
reaction is 1.0 eV $\le$ En < 2.5 MeV (67 energy points), and for the
$^{10}$B($n, {\alpha}$$_{0}$)$^{7}$Li and $^{10}$B($n,
{\alpha}$$_{1}$)$^{7}$Li$^{*}$ reactions is 1.0 eV $\le$ En < 1.0 MeV (59
energy points). The present results have been analyzed by the resonance
reaction mechanism and the level structure of the $^{11}$B compound system, and
compared with existing measurements and evaluations.
