Available student project - Nuclear lifetimes - developing new apparatus and methods

Research fields

  • Physics of the Nucleus
  • Engineering in Physics
Doppler Broadened Gamma-ray Line Shape. Jakob et al. Phys. Rev. C 65, 024316 (2002).

Project details

The lifetimes of excited quantum states in the atomic nucleus give extremely important information about nuclear structure and the shape of the nucleus. This project description covers three measurement methods that together span the nuclear lifetime range from about 100 femtoseconds to many nanoseconds.

Students can select from the following themes:

(i) The Doppler broadened line shape method is based on a detailed analysis of gamma-ray line shapes that are affected by changing Doppler shifts as the decaying nucleus slows down in a solid target. This project will develop analysis methods and address reasons why some measurements by this technique disagree with other methods.

(ii) The recoil distance (or plunger) method is based on measuring the number of decays that occur in flight as an excited nucleus moves at known velocity over a known distance. The flight distance (hence flight time) is adjusted to map out the decay curve. We have new apparatus for this purpose based on a piezo-motor that will be commissioned in this project.

(iii) Direct measurements of the time between the population of a nuclear state and its decay are being developed using a new scintillator materials and digital data acquisition to enable improved measurements through sophisticated digital signal processing (computation and programming).

The outcome of the project will include the commissioning of new equipment, new methods, and enhanced lifetime measurement capability for nuclear structure studies. Students will gain accelerator-based laboratory experience and develop skills in building scientific instruments, scientific programming, digital data acquisition and data analysis.

Required background

No specific background knowledge is required. Aspects of the project will suit students who like to work in the laboratory; other aspects will be computing and data analysis intensive.

Project suitability

This research project can be tailored to suit students of the following type(s)
  • 3rd year special project
  • PhB (2nd or 3rd year)
  • Honours project
  • Phd or Masters
  • Vacation scholar

Contact supervisor

Stuchbery, Andrew profile

Other supervisor(s)

Kibedi, Tibor profile

Lane, Gregory profile

Coombes, Ben profile

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