Eur. Phys. J. D 54, 71-75 (2009)
https://doi.org/10.1140/epjd/e2009-00170-1

dt nuclear fusion within a single Coulomb exploding composite nanodroplet

¹ School of Chemistry, Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
² GoLP/Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, 1049-0001 Lisboa, Portugal

Corresponding author: ^a jortner@chemsg1.tau.ac.il

Received: 15 December 2008
Revised: 7 April 2009
Published online: 16 June 2009

Abstract

We present a computational study of dt fusion driven by Coulomb explosion within a single, large, heteronuclear two-component D₂/T₂ nanodroplet, originating from kinematic overrun effects between deuterons and tritons. Scaled electron and ion dynamics simulations have been used to explore the size dependence and the isotopic composition dependence of the intra-nanodroplet (INTRA) dt fusion yield in a composite D_2n-2kT_2k nanodroplet, initially consisting of an inner sphere of D₂ molecules surrounded by an outer sphere of T₂ molecules (n = 1.4× 10⁸–2.0×10⁹, k/n = 0.10–0.60, and initial radii R₀ = 1100–2700 Å) driven by a single, ultraintense, near-infrared, Gaussian laser pulse (peak intensity 10²⁰ W cm^-2, pulse length 25 fs). INTRA dt fusion in D_2n-2kT_2k nanodroplets with neutron yields of 30–90 (per nanodroplet, per laser pulse) were attained in the size domain R₀ = 2000–2700 Å with the optimal composition in the range of k/n = 0.2–0.4. INTRA yields in D_2n-2kT_2k nanodroplets are similar (within 20–40%) to those in initially homogeneous (DT)_n nanodroplets of the same size. These INTRA yields are sufficiently large to warrant experimental observation in a single nanodroplet. The INTRA dt fusion can be distinguished from the inter-nanodroplet dt fusion reaction, which occurs inside and outside the macroscopic plasma filament, by the nanodroplet size dependence of the yield and by the different energies of the neutrons produced in these two channels.