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Kinetic energy—mass distributions from the fission of nuclei lighter than radium

Plasil, F. and Burnett, D. S. and Britt, H. C. and Thompson, S. G. (1966) Kinetic energy—mass distributions from the fission of nuclei lighter than radium. Physical Review, 142 (3). pp. 696-715. ISSN 0031-899X. doi:10.1103/PhysRev.142.696.

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The distributions in masses and total kinetic energies of fission fragments from a number of elements ranging from erbium to bismuth have been measured. The nuclei undergoing fission were produced by bombarding a variety of targets with projectiles ranging from He4 to O16. The energies of coincident fission fragments were measured using solid-state counters. The energy data were transformed to give mass-total kinetic energy density-of-events distributions. These distributions were compared with those calculated from an approximate version of the liquid-drop model which applies to this region of elements. General agreement in the shapes and widths of the distributions was found, particularly in the cases which involved small angular momenta and small nuclear temperatures. The dependence of the widths of the experimental distributions on the nuclear temperature was found to differ from that predicted by the theory, but uncertainties in the evaluation of nuclear temperatures for the reactions investigated may be large. Analysis of these uncertainties indicated that they were not large enough to alone account for the discrepancy, although this analysis was subject to some error. Angular momentum effects were studied by using certain combinations of targets and projectiles to give the compound nucleus Os186 at the same excitation energy but with different angular momenta. The effect of increasing angular momentum was to broaden and change the shape of the experimental distributions.

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Burnett, D. S.0000-0001-9521-8675
Additional Information:©1966 The American Physical Society. Received 19 August 1965. We would like to thank Dr. J.R. Nix and Dr. W.J. Swiatecki for their guidance and collaboration in connection with the theoretical portions of this work. We also acknowledge very useful discussions with H.R. Bowman and Dr. E.L. Haines. We are further indebted to Dr. Haines for help during the early heavy-ion bombardments. We would like to thank D.J. O'Connell and his co-workers for preparing the targets used in these experiments, W.L. Hansen and his group for supplying us with the solid-state detectors and M. Nakamura for valuable help with electronic equipment, in particular with the multiparameter analyzers. We are grateful to Mrs. C.E. Rugge for writing the programs connected with the theoretical neutron dispersion calculations and to Dr. T. Sikkeland for permission to use his chamber during the heavy-ion bombardments. The help of Mrs. J. Phillips in preparing the manuscript is gratefully acknowledged.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5253
Deposited By: Tony Diaz
Deposited On:06 Oct 2006
Last Modified:08 Nov 2021 20:23

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