Accession Number : AD0748643

Title :   Isomeric Gamma Rays for Times Less than One Microsecond After 235U(n,f) and 239Pu(n,f).

Descriptive Note : Final rept.,

Corporate Author : GULF RADIATION TECHNOLOGY SAN DIEGO CALIF

Personal Author(s) : Sund,R. E. ; Verbinski,V. V. ; Weber,Hans

Report Date : 15 APR 1972

Pagination or Media Count : 55

Abstract : Measurements of the isomeric gamma-ray energy spectra from the thermal-neutron fission of 235U and 239Pu were performed with a Ge(Li) 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)

Descriptors :   (*URANIUM, *FISSION), (*PLUTONIUM, FISSION), GAMMA EMISSION, GAMMA RAY SPECTRA, PULSE HEIGHT ANALYZERS, COINCIDENCE COUNTING, THERMAL NEUTRONS

Subject Categories : Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE