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Laser-induced processes in ultra-dense deuterium D(0) layers eject multi-MeVu-1 particles using ns laser pulse energies of <200 mJ. Such particles havebeen observed previously as mA currents to time-of-flight (TOF) collectors atup to 1 m distance. The signal current is mainly due to the ejection ofsecondary electrons by impinging MeV particles on the collectors. Improvedtwo-collector time-of-flight measurements now show that the energy of theparticles is in the range 1-50 MeV u-1. Their distributions are almost thermalat up to 13 MeV u-1 or are sharper than thermal. The fastest sharp peak mayindicate shock-wave acceleration by many-body energy transfer. A magnetic fieldof 0.4 T deflects only a small part of the multi-MeV particle flux which thusmainly consists of neutral particles. By combining the TOF method with magneticdeflection, it is ascertained that the multi-MeV particles are studied and notany slower particle emission from the target. The neutral multi-MeV particlesare concluded to be fragments of ultra-dense hydrogen HN(0) as observed inother experiments.

Neutral multi-MeV/u particles from laser-induced processes in ultra-dense deuterium D(0): accurate two-collector timing and magnetic analysis