While progress in fusion research continues with magnetic¹ and inertial² confinement, alternative approaches—such as Coulomb explosions of deuterium clusters³ and ultrafast laser−plasma interactions⁴—also provide insight into basic processes and technological applications. However, attempts to produce fusion in a room temperature solid-state setting, including 'cold' fusion⁵ and 'bubble' fusion⁶, have met with deep scepticism⁷. Here we report that gently heating a pyroelectric crystal in a deuterated atmosphere can generate fusion under desktop conditions. The electrostatic field of the crystal is used to generate and accelerate a deuteron beam (> 100 keV and >4 nA), which, upon striking a deuterated target, produces a neutron flux over 400 times the background level. The presence of neutrons from the reaction D + D ³He (820 keV) + n (2.45 MeV) within the target is confirmed by pulse shape analysis and proton recoil spectroscopy. As further evidence for this fusion reaction, we use a novel time-of-flight technique to demonstrate the delayed coincidence between the outgoing -particle and the neutron. Although the reported fusion is not useful in the power-producing sense, we anticipate that the system will find application as a simple palm-sized neutron generator.

1. Physics Department,
2. Chemistry Department,
3. CNSI, University of California Los Angeles, California 90095, USA

Correspondence to: B. Naranjo¹ Correspondence and requests for materials should be addressed to B.N. (Email: naranjo@physics.ucla.edu).

Received 14 December 2004; Accepted 30 March 2005

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