Professor Li, Xing Zhong
Department of Physics, Tsinghua University
In response to your e-mail, I briefly summarize as follows:
- Selective resonant tunneling model was proposed in 1995 [1,2] in order to explain the Huizenga’s three puzzles: How is the Coulomb barrier penetrated? Why is there no commensurate neutron emission? Why is there no strong Gamma radiation?
- Selective resonant tunneling model predicted a long life-time resonance of D-D state in crystal lattice: Life-time ~ Flight-time/(Gamow factor)^1/2. Gamow factor is a very small number.
- This long life-time implied the possibility of having 3-deuteron fusion reactions in low energy beam-target experiments.
- Professor Takahashi confirmed the 3-deuteron fusion reactions in 1997 . Indeed Professor Kasagi first discovered 3-deuteron fusion reaction in 1993 .
- Tritium is the product of 3-deuteron fusion reaction.
- Recently, Dr. T. Claytor of Los Alamos Lab. successfully produced tritium in glow-discharge tube  with pure deuterium gas.
- Dr. T. Claytor has been able to run his glow-discharge tube for several weeks. This implies the possibility of detecting neutrino in the future. 
- Li, X.Z., Proceedings of ICCF-5, April 9-13, 1995, Monte-Carlo, Monaco, p.285.
- Li, X.Z., Journal of New Energy 1996, Vol.1, No.4, 44-54.
- Takahashi, A. et al., Fusion Tech., 1998 , 34, 256.
- Kasagi, J. et al., J. Phys. Soc. Japan, 1995, 64 (3), 778.
- Private communications (2007).
- Li, X.Z. et al., International Journal of Condensed Matter Nuclear Science, 1, 11 (2007)
* Ref.  & has been developed further in:
1. Xing Z. Li, Jian Tian , Ming Y. Mei and Chong X. Li, “Sub-barrier Fusion and Selective Resonant Tunneling,” Phys. Rev. ,C 61, 024610 (2000)
2. Xing Z. Li, Bin Liu, Si Chen, Qing Ming Wei, and Heinrich Hora, “Fusion cross-sections for inertial fusion energy,” Laser and Particle Beam, 22,469 (2004)