Overrun effects in nuclear fusion within a single Coulomb exploding nanodroplet |
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Authors: | I Last F Peano J Jortner and L O Silva |
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Institution: | (1) Dept. Mechanical & Space Engineering, Hokkaido University, Kita 13, Nishi 8, Sapporo 060-8628, Japan;(2) Dept. Mechanical Engineering, Osaka University, Yamada-oka 2-1, Suita 565-0871, Japan |
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Abstract: | We present a theoretical-computational study of intra-nanodroplet (INTRA)
collisions, and of dd and dt nuclear fusion driven by nonuniform Coulomb
explosion (CE) induced by overrun effects in (D2)n and (DT)n
nanodroplets. We explored two systems where distinct overrun effects induce
INTRA nuclear reactions: (1) double-pulse ultraintense laser irradiation of
homonuclear (D2)n nanodroplets, which attain a transient
inhomogeneous density profile that serves as a target for the realization of
nonuniform CE. Overrun effects between nuclei originating from different
spatial regions of the exploding nanodroplet drive INTRA dd fusion; (2)
single-pulse ultraintense laser irradiation of heteonuclear (DT)n
nanodroplets, which results in kinematic overrun effects driving INTRA dt fusion.
We utilized scaled electron and ion dynamics simulations to explore the
inner and outer ionization electron dynamics, the time dependent deuteron
and triton density profiles, the velocities of nuclei and the INTRA fusion
yields in the two systems. In system (1) we identify the formation of a
localized “overrun shell” at the periphery of the exploding nanodroplet,
which is characterized by a narrow spatial range of the fusion generation
function, by maxima in the local density and in the spatially averaged local
velocity, as well as in the bifurcation of the local velocities, which
manifests overrun effects. In system (2) we identify a marked local density
enhancement with dt fusion occurring within most of the entire volume of the
exploding nanodroplet without shell formation. The four-orders-of-magnitude
increase of the dt fusion yield in the one-pulse irradiated (DT)n
nanodroplet, as compared with the two-pulse irradiated (D2)n
nanodroplet, originates from cumulative effects of density and cross section
enhancement. |
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