Abstract
The energy distributions of neutrons fromμ capture in Tl, Pb, and Bi were measured applying a time-of-flight technique, using de-excitationγ-rays from final nuclei as a time reference. The spectra exhibit an evaporation part, which is described by nuclear temperatures varying fromθ=1.06 MeV for Bi toθ=1.22 MeV for Pb, and an exponentially decreasing high-energy distribution with a relative intensity of ∼10%, which is interpreted, on the basis of a simple model, as being due to direct and pre-compound processes.
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Part of this work is the subject of a Ph.D. Thesis D 17, Technische Hochschule Darmstadt, by W.U. Schröder.
This work is part of the research programme of the Berlin-Darmstadt-Fribourg-Zürich Collaboration at CERN. The authors would like to express their thanks to Dr. H. Backe, Prof. E. Kankeleit, Dr. C. Petitjean and Dr. H. Schneuwly for their help during the experiments. The kind hospitality of the CERN Nuclear Physics Division is gratefully acknowledged.
This work was supported by the Bundesministerium für Bildung und Wissenschaft.
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Schröder, W.U., Jahnke, U., Lindenberger, K.H. et al. Spectra of neutrons from μ capture in thallium, lead and bismuth. Z. Physik 268, 57–64 (1974). https://doi.org/10.1007/BF01670062
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DOI: https://doi.org/10.1007/BF01670062