Large-angle correlations between He4 and 1,2,3H or He4 in the reactions 247 and 337 MeV Ar40+natAg: Unexpected properties of the nuclear stratosphere

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ID: 271962
1988
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Abstract
We have measured coincidences between $^{4}\mathrm{He}$ and $^{1}$,2,3H or a second $^{4}\mathrm{He}$ (large-angle correlations) in the reactions 247 and 337 MeV $^{40}$Ar${+}^{\mathrm{nat}}$Ag. These coincidences are dominated by reactions leading to evaporation residues with spins of about 0--70\ensuremath{\Elzxh}. Large values of the angle-integrated double and triple coincidence cross sections indicate that many particle evaporation chains involve 2 or 3 protons and/or 2 or 3 alphas. The angular and energy distributions are well described by an evaporation model with Hauser-Feshbach coupling. However, one must employ effective evaporation barriers for $^{1}\mathrm{H}$ and $^{4}\mathrm{He}$ that are strongly reduced compared to empirical fusion barriers. The barrier reduction required for $^{2}\mathrm{H}$ is rather small, and for $^{3}\mathrm{H}$ no barrier reduction is needed. Evaporation calculations that include emitter deformation do not give a satisfactory explanation for these results. We suggest a new aspect of composite nucleus excitation and evaporation-like decay. A hot, very diffuse nuclear surface may be formed that promotes evaporative decay prior to its relaxation. The low barriers for $^{1}\mathrm{H}$ and $^{4}\mathrm{He}$ reflect the radial extent of this transitory, diffuse surface.
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lacey1988physicallarge-angle Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Roy Lacey;N. N. Ajitanand;John M. Alexander;D. M. de Castro Rizzo;G. F. Peaslee;L. C. Vaz;Morton Kaplan;M. Kildir;G. La Rana;D. J. Moses;W. E. Parker;D. Logan;M. S. Zisman;P. DeYoung;L. Kowalski;
Journal physical review c
Year 1988
DOI
doi:10.1103/PhysRevC.37.2561
URL
https://doi.org/10.1103/physrevc.37.2561
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