Decay schemes of Cl-34 and Sc-47

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1954-12-01
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Nichols, R.
Jensen, E.
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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Cl34 was obtained from a gamma reaction upon ordinary chlorine and its radiation to determine the decay scheme. Three positron components were separated from the beta spectrum of Cl34 obtained from an intermediate-image spectrometer. Coincidence beta spectra obtained with the use of the same instrument gave additional energy determinations for the two lower-energy beta groups as well as indicating the time relationships between the beta groups as well as indicating the time relationships between the beta ray and the gamma rays in Cl34. The low energy gamma ray in Cl34 was studied by means of its internal conversion peak. The 1.1 Mev and 2.1 Mev gamma rays were measured from photographs of the Cl34 gamma scintillation pulse distribution. The decay scheme indicated from the results was completed with the use of beta log ft values and gamma lifetime values for the spin and parity assignments given to the nuclear energy levels.

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