  We report measurement of reactor based electron anti-neutrinos from a
prototype array of plastic scintillator bars ( mini-ISMRAN ) located inside
Dhruva research reactor hall, BARC. The detector setup took data for 128 days
for reactor on (RON) and 51 days for reactor off (ROFF) condition. A detailed
analysis procedure is developed to select the anti-neutrino candidate events
based on the energy deposition, number of bars hit as well as topological event
selection criteria in position and time. Each of these selection criteria are
compared with Monte Carlo based simulations and further an embedding technique
is used to estimate the efficiencies from a data driven background study. The
obtained anti-neutrino like events in RON condition are 218 $\pm$ 50 (stat)
$\pm$ 37 (sys) after background subtraction. The obtained results are compared
with theoretical estimation which yields 214 $\pm$ 32 (sys) anti-neutrino
events for the RON condition.
