Measurement of prompt gamma ray lifetimes of fission fragments of $sup 252$Cf Page: 1 of 14
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MEASURENT OF PROI T GA~kd RAY LIMEItfl OF FISSION FRAQIEUiTS OF 2%?
Ra C. Jared, Nifenecker, and S. G. Thompso h
Lawrence Berkeley Laboratorr
University of California
Berkeley, California 94t720
The time of emission of the prompt gamma rays from the fission fraentas
of th2Cf have been measured over a time range from approximately 1.0 x 10- to
2.0 x irg seconds using the velocity end flight path of the fission fragment to
determine the time. The 2hCf source was deposited on a thin foil attached to a
micrometer screw and located between two fission fragment detectors.n The
distance from the source to one of the fragment detectors was varied over a
range from approximately 0.01 to 2.0 cm. A gamma ray detector waees oated close
to the reference fragment detector and operated in coincidence with the fission
events. The gamma rays associated with the stopped fragments were distinguished
from those of the moving fragments on the basis of the known Doppler shift,
Measurements were taken at various distances,between the source ad the detector.
The measured fission fragment kinetic energies were used~to calculate the masses
of the stopped fragments, Thus t.he gamma ray spectra associated with the dif-
ferent fragment masses were obtained. The measured spectra were then used to
obtain the intensities of the gamma lines at each distance. From these data it
has been possible to obtain the energies and lifetimes of the electromagnetic
radiation emitted by the fragments promuptly after formation. Such data provide
valuable information indicating values of the deformation parameters of the
even-even isotopes; in particular the quadrupole moments calculated on this
basis were found to agree kith the theoretical values.
Work performed under tite auspices of the U. S. Atomic Eiergy Commission.
Third Symposium on the Physics and Chemistry of Fission, Rochester, New Yr e
August 13-17, 1973.Yo M siR
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Jared, R.C.; Nifenecker, H. & Thompson, S.G. Measurement of prompt gamma ray lifetimes of fission fragments of $sup 252$Cf, article, July 1, 1973; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc1031367/m1/1/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.