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Title: Cluster-impact fusion

Abstract

We present a model for the cluster-impact-fusion experiments of Buehler, Friedlander, and Friedman, Calculated fusion rates as a function of bombarding energy for constant cluster size agree well with experiment. The dependence of the fusion rate on cluster size at fixed bombarding energy is explained qualitatively. The role of correlated, coherent collisions in enhanced energy loss by clusters is emphasized.

Authors:
; ;  [1]
  1. (Departamento de Fisica de Materiales, Facultad de Quimica, Universidad del Pais Vasco, Apartado 1072, San Sebastian 20080, Spain (ES))
Publication Date:
OSTI Identifier:
6826059
DOE Contract Number:
AC05-84OR21400
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; (USA); Journal Volume: 64:12
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DEUTERIUM COMPOUNDS; MOLECULE COLLISIONS; HEAVY WATER; ACCELERATION; ION PAIRS; TITANIUM COMPOUNDS; ENERGY LOSSES; KEV RANGE 100-1000; PARTICLE SIZE; SURFACES; TARGETS; THERMONUCLEAR REACTIONS; COLLISIONS; ENERGY RANGE; HYDROGEN COMPOUNDS; KEV RANGE; LOSSES; NUCLEAR REACTIONS; NUCLEOSYNTHESIS; OXYGEN COMPOUNDS; SIZE; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; WATER 656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)

Citation Formats

Echenique, P.M., Manson, J.R., and Ritchie, R.H. Cluster-impact fusion. United States: N. p., 1990. Web. doi:10.1103/PhysRevLett.64.1413.
Echenique, P.M., Manson, J.R., & Ritchie, R.H. Cluster-impact fusion. United States. doi:10.1103/PhysRevLett.64.1413.
Echenique, P.M., Manson, J.R., and Ritchie, R.H. 1990. "Cluster-impact fusion". United States. doi:10.1103/PhysRevLett.64.1413.
@article{osti_6826059,
title = {Cluster-impact fusion},
author = {Echenique, P.M. and Manson, J.R. and Ritchie, R.H.},
abstractNote = {We present a model for the cluster-impact-fusion experiments of Buehler, Friedlander, and Friedman, Calculated fusion rates as a function of bombarding energy for constant cluster size agree well with experiment. The dependence of the fusion rate on cluster size at fixed bombarding energy is explained qualitatively. The role of correlated, coherent collisions in enhanced energy loss by clusters is emphasized.},
doi = {10.1103/PhysRevLett.64.1413},
journal = {Physical Review Letters; (USA)},
number = ,
volume = 64:12,
place = {United States},
year = 1990,
month = 3
}
  • Recent experiments in which beams of D{sub 2}O clusters impact on deuterated targets have been observed to produce higher than expected deuterium-deuterium (D-D) fusion rates, whereas similar experiments with pure D clusters produced no observable D-D fusion. This paper presents a theoretical model capable of explaining these apparently conflicting experimental results. Our calculations indicate that heavy atoms such as O in the cluster, and Ti, Zr, or C in the target are essential for obtaining high fusion rates and D energy enhancement by double Rutherford backscattering in the experiments as conducted. The authors predict the conditions for obtaining comparable yieldsmore » from D, D{sub 2}O, and H{sub 2}O clusters and propose a set of experimental tests.« less
  • Beuhler, Friedlander, and Friedman (BFF) reported anomalously huge D-D fusion rates while bombarding deuterated targets with (D{sub 2}O){sub {ital N}}{sup +} clusters ({ital N}{similar to}25--1000) accelerated to {approx}325 keV (R. J. Beuhler {ital et} {ital al}., Phys. Rev. Lett. {bold 63}, 1292 (1989); R. J. Beuhler {ital et} {ital al}., J. Phys. Chem. {bold 94}, 7665 (1990)) (i.e., {approx}0.3 keV lab energy for D in (D{sub 2}O){sub 100}{sup +}). However, from our analysis of BFF's fusion product spectra, we conclude that their D lab energy was {similar to}50 keV. Therefore, no gross anomalies exist. Also, from our analysis of themore » BFF beam-ranging experiments through 500 {mu}g/cm{sup 2} of Au, we conclude that light-ion-beam contaminants (e.g., D{sup +} of order 100 keV) have not been ruled out, and are the probable cause of their fusion reactions. This work was supported by LLNL Subcontract B116798, Department of Energy (DOE) Grant No. DE-FG02-91ER54109, DOE Magnetic Fusion Energy Technology Fellowship Program (D. H. Lo), and DOE Fusion Energy Postdoctoral Research Program (Kevin W. Wenzel).« less
  • Temperature and kinematic line broadening are the primary contributions to the width of the proton energy spectrum measured in cluster-impact fusion experiments. By ascertaining these two contributions, we have determined an effective temperature for the high-velocity deuteron component that is responsible for the measured fusion yield. The extracted effective temperature is substantially higher than conventional estimates, and implies that cluster-impact fusion is hot fusion on an atomic scale. The proton spectrum rules out contaminants in explaining the high yield.
  • D+D nuclear fusion rates have been measured for 225-keV water cluster anions OD{sup {minus}}, O{sub 2}D{sub 3}{sup {minus}}, and O{sub 3}D{sub 3}{sup {minus}}. Contrary to a recent report for similar cations, these rates fall rapidly with cluster size and are consistent with free-deuteron rates.
  • A Comment on the Letter by R. J. Beuhler, G. Friedlander, and L. Friedman, Phys. Rev. Lett. 63, 1292 (1989).