Author/Authors :
Anli، نويسنده , , Li and Xixiang، نويسنده , , Bai and Xiaozhong، نويسنده , , Wang and Yufeng، نويسنده , , Wang and Jiangchen، نويسنده , , Meng and Weiping، نويسنده , , Chun-Liu and Yuan، نويسنده , , Yuan and Tahai، نويسنده , , Chih and Shenghian، نويسنده , , Huang، نويسنده ,
Abstract :
The prompt neutron spectra of 238U fission induced by 10.17 and 12.12 MeV neutrons have been measured using a multi-segment fission chamber and two ST-451 liquid scintillator neutron detectors in conjunction with a double-TOF technique. Use of coincidence between the fission fragments and neutrons enabled the fission neutrons to be distinguished from other secondary ones. The detection efficiencies of the ST-451 liquid scintillators were determined by combining Monte Carlo calculation using a standard code NEFF4 [1] with experimental calibration using a low-mass 252Cf ionization chamber. The measured spectra can be roughly described by Maxwellian distributions. The Maxwellian temperatures are obtained by fitting equal 1.40±0.04 MeV for 10.17 MeV incident and 1.47±0.04 MeV for 12.12 MeV, respectively. The experimental spectra are compared with theoretical calculated ones by code FINESSE [2] and the evaluation by ENDF/B-VI [3].
