ENTRY 32826 20230916 3282600000001 SUBENT 32826001 20230916 20240316 3282600100001 BIB 12 29 3282600100002 TITLE Comparison of fission neutron energy spectra of 3282600100003 Pu-239 and U-235 by the activation method 3282600100004 AUTHOR (Hu Xuanwen,Mei Qiyong,Liu Tianzhu) 3282600100005 INSTITUTE (3CPRAEP) 3282600100006 REFERENCE (J,CST,6,368,1964) 3282600100007 FACILITY (REAC,3CPRAEP) Thermal neutron reactor 3282600100008 SAMPLE The Pu-239 and U-235 conversion targets were placed 3282600100009 on the collimated neutron beam. The three types of 3282600100010 indicator foils were metal aluminum, quartz crystal 3282600100011 and mixture of (NH4)2HPO4 and pure paraffin. The 3282600100012 intensity of neutron on the indicator foil was about 3282600100013 1E8 n/cm2/s. 3282600100014 DETECTOR (LONGC) The beta counting device included bell shaped 3282600100015 Geiger beta counter, high voltage stabilized power 3282600100016 supply and scaler. The stability was tested using a 3282600100017 U3O8 standard beta source. 3282600100018 PART-DET (B) 3282600100019 METHOD (ACTIV) Four dosimetry reactions were selected to 3282600100020 determine the parameter beta(239Pu), which are 3282600100021 31P(n,p)31Si, 27Al(n,p)27Mg, 28Si(n,p)28Al and 3282600100022 27Al(n,a)24Na, the half-life of the reaction products 3282600100023 are 2.62 hours, 9.5 minutes, 2.3 minutes and 15 3282600100024 hours. The indicator foils were removed after two 3282600100025 hours irradiation, then the beta radioactivity of the 3282600100026 reaction products were measured, the Al indicator 3282600100027 foils were measured after cooling for 25 minutes. 3282600100028 ERR-ANALYS (DATA-ERR) No information 3282600100029 STATUS (TABLE) The abstract of At.En.Sci.Technol,6,368,1964 3282600100030 HISTORY (20230916C) Liu Yangyang (CNDC) 3282600100031 ENDBIB 29 0 3282600100032 NOCOMMON 0 0 3282600100033 ENDSUBENT 32 0 3282600199999 SUBENT 32826002 20230916 20240316 3282600200001 BIB 2 2 3282600200002 REACTION (94-PU-239(N,F)0-NN-1,,KE,,MXW) 3282600200003 ASSUMED (ASSUM,92-U-235(N,F)0-NN-1,,KE) 3282600200004 ENDBIB 2 0 3282600200005 NOCOMMON 0 0 3282600200006 DATA 5 1 3282600200007 EN-DUMMY DATA DATA-ERR ASSUM ASSUM-ERR 3282600200008 EV MEV MEV MEV MEV 3282600200009 0.0253 2.015 0.030 1.94 0.05 3282600200010 ENDDATA 3 0 3282600200011 ENDSUBENT 10 0 3282600299999 ENDENTRY 2 0 3282699999999