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Published February 15, 1955 | public
Journal Article Open

Decays of Ta182 and Ta183


The beta - decays of Ta182 and Ta183 into excited states of W182 and W183 have been studied using a curved crystal gamma-ray diffraction spectrometer and a homogeneous field, ring focusing beta-ray spectrometer. In each case de-excitation of the daughter nucleus gives rise to complex gamma-ray and conversion electron spectra. Energies and relative intensities of gamma rays and conversion lines arising from 27 transitions in W182 and 29 transitions in W183 are presented. Internal conversion coefficients and multipolarities have been deduced for most of the transitions and together with the gamma-ray energies form the basis of decay schemes proposed for both W182 and W183. The two decays are reported together because of the close experimental relationship which existed between them as a consequence of the method used for their production, namely, simultaneous production of Ta182 by single neutron capture and Ta183 by double neutron capture from stable Ta181. A corollary result is the value 1.3 x 10^4 barns for the thermal neutron cross section of Ta182. An interpretation of these results on W182 in terms of collective rotational motion has been given by A. Bohr and collaborators [Kgl. Danske Videnscab. Selskab, Mat.-fys. Medd. 29, No. 9 (1955)].

Additional Information

©1955 The American Physical Society Work supported by Office of Ordnance Research (U. S. Army), and the U. S. Atomic Energy Commission, and performed in part with equipment built with funds granted by the Research Corporation of America. A portion of this work was submitted by Joseph J. Murray as a Ph.D. thesis, California Institute of Technology, 1954 (unpublished). We gratefully acknowledge the efforts of Dr. W. B. Lewis in arranging for irradiations in the Materials Testing Reactor, Arco, Idaho, under the auspices of the Phillips Petroleum Company. We wish to acknowledge the vaulable contribution of Mr. P. Snelgrove. Also we wish to thank Professor A. Bohr for many helpful discussions.


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