  A digital data acquisition system (DDAS) has been implemented for the Low
Energy Neutron Detector Array (LENDA). LENDA is an array of 24 BC-408
plastic-scintillator bars designed to measure low-energy neutrons with kinetic
energies in the range of 100 keV to 10 MeV from (p,n)-type charge-exchange
reactions. Compared to the previous data acquisition (DAQ) system for LENDA,
DDAS offers the possibility to lower the neutron detection threshold, increase
the overall neutron-detection efficiency, decrease the dead time of the system,
and allow for easy expansion of the array. The system utilized in this work was
XIA's Digital Gamma Finder Pixie-16 250 MHz digitizers. A detector-limited
timing resolution of 400 ps was achieved for a single LENDA bar. Using DDAS,
the neutron detection threshold of the system was reduced compared to the
previous analog system, now reaching below 100 keV. The new DAQ system was
successfully used in a recent charge-exchange experiment using the
$^{16}$C(p,n) reaction at the National Superconducting Cyclotron Laboratory
(NSCL).
