Prompt and Sequential Decay Processes in the Fragmentation of 40 MeV/A 20Ne Projectiles

R. J. Charity, Department of Chemistry, Washington University
L. G. Sobotka, Department of Chemistry, Department of Physics, Washington University
N. J. Robertson, Department of Physics, Washington University
D. G. Sarantites, Department of Chemistry, Washington University
J. Dinius, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University
C. K. Gelbke, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University
T. Glasmacher, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University
D. O. Handzy, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University
W. C. Hsi, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University
M. J. Huang, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University
W. G. Lynch, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University
C. P. Montoya, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University
Graham F. Peaslee, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State UniversityFollow
C. Schwarz, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University
M. B. Tsang, National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University

Document Type

Article

Publication Date

12-1-1995

Publication Source

Physical Review C

Volume Number

52

Issue Number

6

First Page

3126

Last Page

3150

Publisher

American Physical Society

Abstract

The fragmentation of E/A=40 MeV Ne20 projectiles into exit channels containing only p, d, t, He3, α, He6, Li6, and Li7fragments has been investigated. Relative shifts between the average longitudinal velocity of each fragment type were measured with Sn120 and Au197 targets. A post-breakup Coulomb acceleration component of these shifts was isolated. Its magnitude indicates that the projectile broke up while in near contact with the target. On the other hand, correlations between projectile fragments indicate that a significant fraction of these fragments are produced by the sequential decay of long- and short-lived unstable intermediates. A fully sequential decay process, although consistent with the experimental relative angle distributions, fails to reproduce the correlation function. Thus, a picture emerges of a prompt breakup step producing stable and unstable particles with the subsequent decay of the latter extending over a long time period.

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