A motor driven plunger has been constructed for measuring lifetimes of nucl
ear excited states in pico second region. An array consisting of six neutro
n detectors was used to clean up gamma-spectra obtained with CS-HPGe detect
ors. Lifetimes of low excited states in neutron deficient nuclei with low p
roduction cross-section e.g. Y-81, Kr-77 and Rb-78 are reported.