Isomeric Gamma Rays for Times Less than One Microsecond After 235U(n,f) and 239Pu(n,f).
GULF RADIATION TECHNOLOGY SAN DIEGO CALIF
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Measurements of the isomeric gamma-ray energy spectra from the thermal-neutron fission of 235U and 239Pu were performed with a GeLi detector for times betweeen 20 nsec and about 1 microsec after fission. Sixty-nine resolved gamma-ray peaks with different energies and half lives were observed 36 of these gamma-ray peaks had not been seen in previous delayed gamma-ray measurements. The fission-fragment mass numbers for many of the gamma rays were determined by comparison of the gamma-ray energies and half lives with the results of previous 252Cf measurements. Gamma rays which decay in cascade from the same isomeric state were identified on the basis of mass numbers, gamma-ray half lives, and intensities. Author
- Nuclear Physics and Elementary Particle Physics