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Alpha emission in coincidence with fission-like fragments from Cl+Ag reactions at 10 MeV/n

  • Nuclei
  • Published:
Zeitschrift für Physik A Atoms and Nuclei

Abstract

Energy and angular correlations between alpha particles and fission-like fragments in the reaction of35Cl+Ag at 10 MeV/n have been measured. The coincident yield is dominated by two mechanisms: sequential emission from both fragments (M α =0.137±0.014) and alpha emission from the composite system prior to scission (M α =0.124±0.012). The observation of nuclear shadowing for sequential emission from the fragments allowed us to estimate the “lifetime” of the 218 MeV excited143Gd composite system as (1–3)×10−20s. It is argued that this rather long time reflects the slow evolution in shape of the composite system and might be termed “sticking time,” since statistical-model lifetimes are typically an order of magnitude shorter. Observed also are small contributions of nonequilibrium emission in the forward direction (M α =0.005±0.001) and a component displaying the characteristics of emission from the neck (M α =0.010±0.002).

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Authors and Affiliations

  1. Institute of Modern Physics, Academia Sinica, Lanchow, China

    G. -Y. Fan

  2. Institute of Nuclear Physics, Krakow, Poland

    R. Wolski

  3. Max-Planck-Institut für Kernphysik, Heidelberg, Federal Republic of Germany

    L. Schad, H. Ho, G. -Y. Fan, B. Lindl, A. Pfoh, R. Wolski & J. P. Wurm

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  1. L. Schad
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  2. H. Ho
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  3. G. -Y. Fan
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  4. B. Lindl
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  5. A. Pfoh
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  7. J. P. Wurm
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Additional information

The fusion cross section was experimentally defined as the sum of evaporation residue cross section and fission cross section

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Schad, L., Ho, H., Fan, G.Y. et al. Alpha emission in coincidence with fission-like fragments from Cl+Ag reactions at 10 MeV/n. Z Physik A 318, 179–190 (1984). https://doi.org/10.1007/BF01413466

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  • DOI: https://doi.org/10.1007/BF01413466

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