We present evidence for the production of H2 (d,n) 3 He neutrons in gaseous deuterium by using a pyroelectric crystal as positive ion accelerator. In contrast to previous studies, neutrons were generated without a tip attached to the crystal and without using a solid deuterated target. The deuterium gas provided both the projectile and target nuclei. On the average, 1 neutron/s was obtained in our "hot fusion" experimental setup. No neutrons were detected when a tip was used. © 2008 American Institute of Physics.