  In this paper we reveal an additional new cause for decreasing of particles
interference. We found that particle which, transmits kinetic energy to the
detector decrease its wave packet area size. A detector that transmits kinetic
energy to the particle increases the particle's wave packet area. We found
these phenomena cause decrease in the interference pattern. We show that the
interference pattern decrease is graduate and proportional to the amount of the
particle's kinetic energy change. We show that our findings are in agreement
with the results of different experiments like the two slits experiment and the
two paths interferometer experiment. We conclude the wave like behavior of the
particle, is not have to lost in the detection process, it changes its area
size.
