Delayed gamma emission in the fission of 235U

A diamond gammavoltaic cell utilizing surface conductivity and its response to different photon interaction mechanisms

“…The terminated device is then tested under irradiation from a synchrotron beam, scanning over energies between approximately 50 -150 keV. This range is of interest, as it covers several gamma emission energies, most prominently Am-241 [47] and a significant portion of the U-235* fission delayed-gamma spectrum [48]. This range is equally of interest because it is the range over which the photon interaction mechanism for diamond changes from the photoelectric effect (PE) to Compton scattering (CS) [49].…”

Identification and characterization of isomeric states in the de-excitation of 252Cf fission fragments

“…As for the Ge(Li) gamma rays, the energy uncertainty (+0.1 keV) reflects the estimated uncertainty in the energy calibration. In both Tables 2 and 3 [; 37 (28) 63 (19) ^Experimental time resolution prevents accurate half-life determination. Lower limit is -0.1 nsiec due to Pb shield.…”

“…Other early investigations of this type of radiation include those by Walton and Sund (17), Johansson (18) and Popeka et al (19). These early studies were made with low- These uncertainties in the nature of delayed radiation indicated the desirability of further investigation and clarification of fission fragment isomerism.…”

Identification and characterization of isomeric states in the de-excitation of 252Cf fission fragments

“…An uncertainty of +2 amu has been assigned to these cases. [; 37 (28) 63 (19) ^Experimental time resolution prevents accurate half-life determination. Lower limit is -0.1 nsiec due to Pb shield.…”

“…Other early investigations of this type of radiation include those by Walton and Sund (17), Johansson (18) and Popeka et al (19). These early studies were made with low- (2) Rotational cascades are not observed, in contradiction to the earlier low-resolution work of Johansson (18); and (3) The energies and half-lives spanned by the data imply that the delayed transitions are El, Ml, or E2, "either allowed or K-forbidden by a few units", and that the initially high spins of the fragments are less important than indicated by Johansson (18) in determining the character of the delayed gamma rays.…”