Date of Award

Spring 1962

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)



First Advisor

Cressman, Paul J.

Second Advisor

Berners, Edgar D.

Third Advisor

Lee Kurik


The purpose of present research is to determine the mean life of the 2.14 MeV level of Boron 11 excited by the gamma-rays of the bremsstrahlung spectrum from a linear accelerator by photoexcitation. In this thesis an experimental procedure for overcoming the problem of background and observing resonant scattering will be described. Two sources of background, the compton scattering and the cosmic rays, cause difficulty in particular. The first was reduced and separated from the resonant scattering by measuring the radiation at an angle of 120 degrees. The second was effectively eliminated by a gate circuit.