New prompt spectral gamma-ray data from the reaction 252Cf(sf) and its implication on present evaluated nuclear data files

We present results from new spectral prompt gamma-ray measurements from the spontaneous fission of 252Cf. Apart from one recent experiment, about four decades have passed since the last dedicated experiments were reported in the literature. Hence, there was a need for a revision. We have measured prompt fission gamma rays with both cerium-doped LaBr3 and CeBr3 scintillation detectors, both of which exhibit excellent timing and good energy resolution. The emission yield was determined to be nu_gamma=(8.30±0.08)/fission and nu_gamma=(8.31±0.10)/fission, with the average energy of epsilon_gamma=(0.80±0.01) MeV and epsilon_gamma=(0.80±0.01) MeV and total energy of E_gamma,tot=(6.64±0.08) MeV and E_gamma,tot=(6.65±0.12) MeV, with the LaBr3 and CeBr3 detectors, respectively. Since the results from the two detectors are in excellent agreement and confirm the historical data, but not those in the present evaluated nuclear data files, we strongly recommend an update.

BILLNERT Robert;  HAMBSCH Franz-Josef;  OBERSTEDT Andreas;  OBERSTEDT Stephan; 

2013-09-18

AMER PHYSICAL SOC

JRC75036

0556-2813,   

http://link.aps.org/doi/10.1103/PhysRevC.87.024601,    https://publications.jrc.ec.europa.eu/repository/handle/JRC75036,   

10.1103/PhysRevC.87.024601,