ENTRY 20356 20201113 22952035600000001 SUBENT 20356001 20201113 22952035600100001 BIB 11 40 2035600100002 TITLE A measurement of the neutron fission cross section of 2035600100003 235U between 0.5 and 1.2 MeV 2035600100004 AUTHOR (F.Kaeppeler) 2035600100005 INSTITUTE (2GERKFK) 2035600100006 REFERENCE (R,KFK-1772,1973) 2035600100007 (C,72VIENNA,,213,1972) 2035600100008 Same cross section table given 2035600100009 REL-REF (N,,F.Kaeppeler+,P,KFK-2223,9,1975) 2035600100010 Theoretical analysis of the saddle point property 2035600100011 (M,,F.Kaeppeler+,C,72VIENNA,,75,1972) 2035600100012 Neutron flux determination 2035600100013 FACILITY (VDG,2GERKFK) 3-MeV Van de Graaff 2035600100014 INC-SOURCE (P-LI7) Li (40 keV thick) evaporated on Ta sheet 2035600100015 (0.3 mm thick) 2035600100016 SAMPLE Uranium acetate electrosprayed onto stainless steel. 2035600100017 Four samples were used: 2035600100018 1. 0.25 mm thick backing, 139 ug/cm2 thick, 1.744 mg 2035600100019 2. 0.25 mm thick backing, 95 ug/cm2 thick, 1.194 mg 2035600100020 3. 0.25 mm thick backing, 74 ug/cm2 thick, 0.933 mg 2035600100021 4. 0.9 mm thick backing, 100 ug/cm2 thick, 1.265 mg 2035600100022 where mass is believed to be accurate to +/-0.4%. 2035600100023 (92-U-235,ENR=0.99501) 2035600100024 (92-U-234,ENR=0.00166) 2035600100025 (92-U-236,ENR=0.00027) 2035600100026 (92-U-238,ENR=0.00306) 2035600100027 METHOD (TOF) flight path (target-glass detector) of 3.20 m. 2035600100028 Pulse-width of 1 ns, repetition rate of 2.5 MHz, and 2035600100029 time resolution of 1 ns/m. 2035600100030 Mean energy and half-width determined with an accuracy2035600100031 of 5 keV and 10%, respectively. 2035600100032 DETECTOR (SCIN) Gas scintillator detector (85% Ar+15% N) for 2035600100033 fission fragment detection 2035600100034 (SIBAR) for detection of recoil protons from stearic 2035600100035 acid or glycerol tristearate radiator 2035600100036 (GLASD) for neutron spectrum measurement 2035600100037 HISTORY (19730628C) 2035600100038 (19740929E) 2035600100039 (19810305A) REACTION, MONITOR and ERROR-ANALYS re-coded2035600100040 (19810310E) 2035600100041 (20201113A) On. Major revisions in 002-003. 2035600100042 ENDBIB 40 0 2035600100043 NOCOMMON 0 0 2035600100044 ENDSUBENT 43 0 2035600199999 SUBENT 20356002 20201113 22952035600200001 BIB 7 17 2035600200002 REACTION (92-U-235(N,F),,SIG) 2035600200003 METHOD Back-to-back arrangement (Geometry B) 2035600200004 ANALYSIS Absolute measurement 2035600200005 MONITOR (1-H-1(N,EL)1-H-1,,SIG) 2035600200006 Data points in four experimental works interpolated 2035600200007 ERR-ANALYS (ERR-T) Total uncertainty (2.6-3.4%)2035600200008 (ERR-S,0.8,2.0) Count ratio with BG correct. (0.8-2.0%)2035600200009 (ERR-1) n-p scattering cross section (0.5%)2035600200010 (ERR-2,1.0,1.8) Neutron scattering correction(1.0-1.8%)2035600200011 (ERR-3) H - stoichiometric correction (0.8%)2035600200012 (ERR-4,0.5,1.8) H - atom number (0.5-1.8%)2035600200013 (ERR-5) U - atom number (0.5%)2035600200014 (ERR-6,0.6,1.0) H - detection efficiency (0.6-1.0%)2035600200015 (ERR-7) U - detection efficiency (0.8%)2035600200016 STATUS (TABLE) Table 7 of KFK-1772 2035600200017 HISTORY (19810305A) REACTION and ERROR-ANALYS re-coded. 2035600200018 (20201113A) On. ERR-ANALYS revised. 2035600200019 ENDBIB 17 0 2035600200020 COMMON 4 3 2035600200021 ERR-1 ERR-3 ERR-5 ERR-7 2035600200022 PER-CENT PER-CENT PER-CENT PER-CENT 2035600200023 0.5 0.8 0.5 0.8 2035600200024 ENDCOMMON 3 0 2035600200025 DATA 4 7 2035600200026 EN EN-RSL-HW DATA ERR-T 2035600200027 KEV KEV B PER-CENT 2035600200028 546. 22. 1.207 3.4 2035600200029 662. 23. 1.215 2.6 2035600200030 758. 23. 1.164 2.6 2035600200031 908. 22. 1.193 2.9 2035600200032 1057. 26. 1.248 3.0 2035600200033 1125. 25. 1.256 3.4 2035600200034 1175. 25. 1.221 3.4 2035600200035 ENDDATA 9 0 2035600200036 ENDSUBENT 35 0 2035600299999 SUBENT 20356003 20201113 22952035600300001 BIB 7 18 2035600300002 REACTION (92-U-235(N,F),,SIG) 2035600300003 MONITOR (92-U-235(N,F),,SIG) 2035600300004 Normalized to the absolute measurement (002) 2035600300005 METHOD Solid angle between target and fissile sample is 2035600300006 doubled (Geometry A) compared to back-to-back 2035600300007 arrangement used for absolute measurement 2035600300008 FLAG (1.) Among values in Table 7, 2035600300009 - 1.178 b @ 795 keV is deleted, 2035600300010 - 1.012 b @ 872 keV is corrected to 1.102 b 2035600300011 (probably following author's letter). 2035600300012 (2.) Deficiencies in Table 7 corrected following 2035600300013 author's letter to CCDN, 1974-07-04. 2035600300014 ERR-ANALYS (ERR-S) Statistical uncertainty 2035600300015 (ERR-1) Fit to the absolute measurement result 2035600300016 STATUS (TABLE) Table 7 of KFK-1772 2035600300017 (DEP,20356002) Absolute measurement 2035600300018 HISTORY (19810305A) REACTION and ERROR-ANALYS re-coded. 2035600300019 (20201113A) On. EN-RSL -> EN-RSL-HW. FLAG updated. 2035600300020 ENDBIB 18 0 2035600300021 COMMON 1 3 2035600300022 ERR-1 2035600300023 PER-CENT 2035600300024 3. 2035600300025 ENDCOMMON 3 0 2035600300026 DATA 5 12 2035600300027 EN EN-RSL-HW DATA ERR-S FLAG 2035600300028 KEV KEV B PER-CENT NO-DIM 2035600300029 513. 32. 1.210 0.9 2035600300030 580. 20. 1.193 1.8 2035600300031 678. 21. 1.208 1.2 2035600300032 767. 20. 1.165 0.9 2035600300033 872. 20. 1.102 2.1 1. 2035600300034 920. 22. 1.141 1.5 2035600300035 930. 20. 1.172 1.9 2035600300036 945. 24. 1.206 1.1 2035600300037 966. 21. 1.213 1.2 2035600300038 1013. 20. 1.293 1.9 2035600300039 1060. 22. 1.227 1.2 2035600300040 1164. 40. 1.244 1.8 2. 2035600300041 ENDDATA 14 0 2035600300042 ENDSUBENT 41 0 2035600399999 ENDENTRY 3 0 2035699999999