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The Two-Photon Decay of the 11-/2 Isomer of 137Ba and Mixed-Symmetry States of 92,94Zr and 94Mo

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  • © 2016

Overview

Authors:
  1. Christopher Walz

    1. -, -, Wiesbaden, Germany

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  • Nominated as an outstanding Ph.D. thesis by the TU Darmstadt
  • Presents the observation of a new electromagnetic decay mode in nuclear physics
  • Provides a clear and reader-friendly introduction to the topics of the two-photon decay and mixed-symmetry states
  • Presents a new signature for the identification of quadrupole mixed-symmetry states in spherical nuclei
  • Includes supplementary material: sn.pub/extras

Part of the book series: Springer Theses (Springer Theses)

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Table of contents (9 chapters)

  1. Front Matter

    Pages i-xv
    Download chapter PDF

  2. Introduction

    • Christopher Walz
    Pages 1-8

  3. Theoretical Background of the Two-Photon Decay Experiment

    • Christopher Walz
    Pages 9-17

  4. Experimental Setup of the Two-Photon Decay Experiment

    • Christopher Walz
    Pages 19-28

  5. Data Analysis and Results of the Two-Photon Decay Experiment

    • Christopher Walz
    Pages 29-43

  6. Theoretical Background of the Proton Scattering Experiments

    • Christopher Walz
    Pages 45-62

  7. The Experimental Setup at iThemba LABS

    • Christopher Walz
    Pages 63-70

  8. Data Analysis and Results of the Proton Scattering Experiments

    • Christopher Walz
    Pages 71-105

  9. Interpretation

    • Christopher Walz
    Pages 107-143

  10. Summary and Outlook

    • Christopher Walz
    Pages 145-148

  11. Back Matter

    Pages 149-160
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Keywords

About this book

This work focuses on new electromagnetic decay mode in nuclear physics. The first part of the thesis presents the observation of the two-photon decay for a transition where the one-photon decay is allowed. In the second part, so called quadrupole mixed-symmetry is investigated in inelastic proton scattering experiments. In 1930 Nobel-prize winner M. Goeppert-Mayer was the first to discuss the two-photon decay of an exited state in her doctoral thesis. This process has been observed many times in atomic physics. However in nuclear physics data is sparse. Here this decay mode has only been observed for the special case of a transition between nuclear states with spin and parity quantum number 0+. For such a transition, the one-photon decay – the main experimental obstacle to observe the two-photon decay – is forbidden. Furthermore, the energy sharing and angular distributions were measured, allowing conclusions to be drawn about the multipoles contributing to the two-photon transition. Quadrupole mixed-symmetry states are an excitation mode in spherical nuclei which are sensitive to the strength of the quadrupole residual interaction. A new signature for these interesting states is presented which allows identification of mixed-symmetry states independently of electromagnetic transition strengths. Furthermore this signature represents a valuable additional observable to test model predictions for mixed-symmetry states.

Authors and Affiliations

  • -, -, Wiesbaden, Germany

    Christopher Walz

Bibliographic Information

  • Book Title: The Two-Photon Decay of the 11-/2 Isomer of 137Ba and Mixed-Symmetry States of 92,94Zr and 94Mo

  • Authors: Christopher Walz

  • Series Title: Springer Theses

  • DOI: https://doi.org/10.1007/978-3-319-27183-5

  • Publisher: Springer Cham

  • eBook Packages: Physics and Astronomy, Physics and Astronomy (R0)

  • Copyright Information: Springer International Publishing Switzerland 2016

  • Hardcover ISBN: 978-3-319-27181-1Published: 08 February 2016

  • Softcover ISBN: 978-3-319-80086-8Published: 30 March 2018

  • eBook ISBN: 978-3-319-27183-5Published: 24 December 2015

  • Series ISSN: 2190-5053

  • Series E-ISSN: 2190-5061

  • Edition Number: 1

  • Number of Pages: XV, 160

  • Number of Illustrations: 9 b/w illustrations, 62 illustrations in colour

  • Topics: Nuclear Physics, Heavy Ions, Hadrons, Theoretical, Mathematical and Computational Physics

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