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Published December 1, 1962 | public
Journal Article Open

Nuclear resonance excitation using a diffraction monochromator


Nuclear resonance scattering from the first excited states in F19 and Mn55 has been studied with the bent-diffraction-crystal monochromator. The experiment was performed by observing the scattered radiation from nuclei exposed to nearly monoenergetic x rays selected by crystal diffraction from the bremsstrahlung spectrum of an x-ray tube. Gamma rays scattered at 135° from samples of lithium fluoride and manganese placed in the diffracted beam were observed as a function of the incident photon wavelength. With the lithium fluoride sample three measurements were made under different experimental conditions. In each case pronounced resonance peaks 10 to 15% above background were observed. A least-squares analysis of the data gives 109.894±0.005 keV for the energy position of the first excited level in F19. From the observed yield the width of this level was deduced to be (5.1±0.7)×10^-7 eV. Measurements with a Mn55 scattering sample gave 125.95±0.01 keV for the position of the first excited level and (1.1±0.3)×10^-6 eV for the resonance width.

Additional Information

© 1962 The American Physical Society. Received 16 July 1962. We wish to express our appreciation to Professor J. W. M. DuMond for his constant interest in the progress of the research and for his valuable advice and encouragement. Thanks are due to H. E. Henrikson for his excellent engineering advice throughout this work. We furthermore wish to thank C. H. Holland and D. Agresti for their assistance in collection and analysis of the data. This work was performed under the auspices of the U.S. Atomic Energy Commission.


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