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Related Experiment Videos

Coherent resonant x-ray scattering from a rotating medium.

R Rohlsberger1, T S Toellner, W Sturhahn

  • 1Universitat Rostock, Fachbereich Physik, August-Bebel-Strasse 55, 18055 Rostock, Germany. roehle@physik.1.uni-rostock.de

Physical Review Letters
|October 4, 2000
PubMed
Summary

Nuclear states gain a phase shift when rotating, causing radioactive decay to align with the rotation. This phenomenon was observed using synchrotron radiation on a rotating 57Fe foil.

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Area of Science:

  • Nuclear physics
  • Quantum mechanics
  • Materials science

Background:

  • Coherently excited nuclear states exhibit time evolution influenced by external factors.
  • Angular momentum and rotation angle are key parameters in nuclear dynamics.
  • Radiative decay patterns can provide insights into nuclear states.

Purpose of the Study:

  • To investigate the influence of sample rotation on the phase evolution of coherently excited nuclear states.
  • To explore the relationship between nuclear angular momentum, rotation angle, and radiative decay direction.
  • To experimentally verify the mapping of nuclear decay time spectra onto an angular scale.

Main Methods:

  • Utilizing nuclear resonant scattering of synchrotron radiation.
  • Employing a rotating sample of 57Fe metal foil at high speeds (18 kHz).

Related Experiment Videos

  • Analyzing the time spectrum of nuclear decay events.

    • Main Results:

    • A measurable phase shift was observed in the coherently excited nuclear state.
    • The phase shift was found to be proportional to the sample's angular momentum and rotation angle.
    • The radiative decay was observed to proceed in the direction of sample rotation.
    • The nuclear decay time spectrum was successfully mapped onto an angular scale.

    Conclusions:

    • Sample rotation induces a phase shift in excited nuclear states, directly impacting radiative decay direction.
    • This effect provides a novel method for angularly encoding nuclear decay information.
    • The experimental observation validates theoretical predictions regarding rotational effects on nuclear states.