ENTRY 41783 20250702 4178300000001 SUBENT 41783001 20250702 20251001 4178300100001 BIB 10 30 4178300100002 TITLE 252Cf spontaneous fission neutrons spectrum at energy 4178300100003 range 0.01 - 10 MeV 4178300100004 AUTHOR (V.N.Nefedov,B.I.Starostov,A.F.Semenov) 4178300100005 REFERENCE (R,INDC(CCP)-060,139,1974) In Russian. 4178300100006 REL-REF (M,,V.N.Nefedov+,C,73KIEV,4,163,1973) 4178300100007 Preliminary measurement with 6LiI(Eu) neutron detector.4178300100008 Delayed neutrons peaks for HL = 7.5, 4178300100009 28.(estimated energy 0.2 MeV), 4178300100010 120 nsec (estimated energy 0.07 - 0.12 MeV). 4178300100011 Neutron TOF spectrum of Fig.2. 4178300100012 INSTITUTE (4RUSNIR) 4178300100013 SAMPLE 252Cf layer on stainless steel backing of 0.3 mm 4178300100014 thickness, layer diameter - 15 mm, 4178300100015 activity 1.2E+5 fis/sec, 4178300100016 covered by Au foil of 100 microgram/cm2 thickness. 4178300100017 METHOD (TOF) TOF base 5, 10, 25, 50 cm, 4178300100018 measurement relative U-235. 4178300100019 DETECTOR (FISCH) Chamber with U-235 layers of 0.2 mm thickness, 4178300100020 30 mm ( at TOF base 5 and 10 cm) and 4178300100021 100 mm ( at TOF base 25 and 50 cm) diameters, 4178300100022 xenon-filled at 1.5 atm pressure. 4178300100023 Equipped by FEU-36 photomultiplier. 4178300100024 For neutrons detection. 4178300100025 (IOCH) Cylinder of 50 mm diameter, 115 mm long, from 4178300100026 stainless steel of 1 mm walls thickness, filled with 4178300100027 xenon at 4 atm pressure. 4178300100028 Equipped by FEU-30 photomultiplier. 4178300100029 For FF detection. 4178300100030 CORRECTION Background due to scattered neutrons was measured . 4178300100031 HISTORY (20250702C) M.M. 4178300100032 ENDBIB 30 0 4178300100033 NOCOMMON 0 0 4178300100034 ENDSUBENT 33 0 4178300199999 SUBENT 41783002 20250701 20251001 4178300200001 BIB 4 9 4178300200002 REACTION (98-CF-252(0,F)0-NN-1,PR,KE) 4178300200003 ANALYSIS Average energy of Cf-252 spontaneous fission spectrum 4178300200004 neutrons was determined as 3/2 * T, where T is 4178300200005 temperature of neutron spectrum. 4178300200006 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 4178300200007 article. 4178300200008 STATUS (TABLE,,V.N.Nefedov,R,INDC(CCP)-060,139,1974) 4178300200009 Text page 141 4178300200010 (DEP,41783003) Temperature of spectrum 4178300200011 ENDBIB 9 0 4178300200012 NOCOMMON 0 0 4178300200013 DATA 2 1 4178300200014 DATA DATA-ERR 4178300200015 MEV MEV 4178300200016 2.145 0.045 4178300200017 ENDDATA 3 0 4178300200018 ENDSUBENT 17 0 4178300299999 SUBENT 41783003 20250701 20251001 4178300300001 BIB 5 14 4178300300002 REACTION (98-CF-252(0,F)0-NN-1,PR,KEM) 4178300300003 ANALYSIS Temperature was determined by fitting of measured 4178300300004 neutron spectrum by Maxwellian distribution in energy 4178300300005 range 0.7 - 10 MeV. 4178300300006 Measured at 0.010 - 10 MeV energy range spectrum is 4178300300007 presented on Fig. (low quality for digitization) of 4178300300008 page 141 in R,INDC(CCP)-060,139,1974. 4178300300009 COMMENT Of authors. 4178300300010 At energy range below 0.7 MeV the measured spectrum 4178300300011 is higher than Maxwellian due to delayed neutrons. 4178300300012 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 4178300300013 article. 4178300300014 STATUS (TABLE,,V.N.Nefedov,R,INDC(CCP)-060,139,1974) 4178300300015 Text page 141 4178300300016 ENDBIB 14 0 4178300300017 NOCOMMON 0 0 4178300300018 DATA 2 1 4178300300019 DATA DATA-ERR 4178300300020 MEV MEV 4178300300021 1.43 0.03 4178300300022 ENDDATA 3 0 4178300300023 ENDSUBENT 22 0 4178300399999 ENDENTRY 3 0 4178399999999