ENTRY 10595 20201130 14751059500000001 SUBENT 10595001 20201130 14751059500100001 BIB 11 30 1059500100002 TITLE The U235 neutron fission cross section measurement at 1059500100003 the NBS linac 1059500100004 AUTHOR (O.A.Wasson) 1059500100005 INSTITUTE (1USANBS) 1059500100006 REFERENCE (C,76ANL,,183,1976) 1059500100007 (J,NSE,81,196,1982) Revised data in table 1059500100008 REL-REF (O,10950001,O.A.Wasson+,J,NSE,81,196,1982) 1059500100009 235U(n,f) cross sections from the same fission chamber1059500100010 FACILITY (LINAC,1USANBS) NBS linear accelerator 1059500100011 SAMPLE 10 surfaces each coated with ~0.1 mg/cm2 of 235U 1059500100012 placed at 69 m along the flight path 1059500100013 DETECTOR (FISCH) 10-plate fission chamber with Cd shield 1059500100014 CORRECTION Corrections made for 1059500100015 - background (measured by resonance filter technique),1059500100016 - dead time, 1059500100017 - neutron scattering in fission chamber, 1059500100018 - detector efficiencies, 1059500100019 - neutron transmission between fission chamber and 1059500100020 flux monitor, 1059500100021 - spectrum loss in proportional counter, 1059500100022 - timing shift in proportional counter. 1059500100023 STATUS (TABLE) Revised data received in private communication,1059500100024 O.Wasson, 1981/12. 1059500100025 (APRVD) Approved by O.A.Wasson 1982/4/22. 1059500100026 HISTORY (19760413C) 1059500100027 (19820112A) BIB corrections and additions. 1059500100028 (19830922A) BIB corrections. 1059500100029 (20040723A) Converted to new data formats, lower case. 1059500100030 (20170510A) On. Major revisions in 002+003. 005 added. 1059500100031 (20201130A) On. Important alteration in 003. 1059500100032 ENDBIB 30 0 1059500100033 NOCOMMON 0 0 1059500100034 ENDSUBENT 33 0 1059500199999 SUBENT 10595002 20170510 14321059500200001 BIB 8 20 1059500200002 REACTION (92-U-235(N,F),,SIG,,AV) 1059500200003 METHOD (TOF) 200 m flight path 1059500200004 DETECTOR (PROPC) Hydrogen proportional counter flux monitor 1059500200005 MONITOR ((MONIT)92-U-235(N,F),,SIG) 1059500200006 Normalized to 2.55+/-0.05 b at 10-20 keV, 1059500200007 which is from 243.7+/-1.0 b*eV at 7.8-11.0 eV, 1059500200008 which is from thermal cross section of 583.54 b 1059500200009 (1-H-1(N,EL)1-H-1,,SIG) 1059500200010 Shape normalization from ENDF/B-V 1059500200011 MONIT-REF (,W.P.Poenitz,R,ANL-NDM-45,1979) 235U(n,f) 1059500200012 (,J.C.Hopkins+,J,ND/A,9,137,1971) n-p data in ENDF/B-V 1059500200013 ERR-ANALYS (ERR-T) Total uncertainty 1059500200014 (ERR-S) Statistical uncertainty 1059500200015 (ERR-1) Shape systematic uncertainty 1059500200016 (ERR-2) Normalization uncertainty 1059500200017 STATUS (TABLE) Received from O.Wasson, 1981/12 1059500200018 (COREL,10595003) 6 eV to 30 keV with 6Li glass detector1059500200019 (COREL,10595005) Broader group structure 1059500200020 HISTORY (19820112A) Data replaced 1059500200021 (20170510A) On.MONIT-ERR moved to text(a part of ERR-2)1059500200022 ENDBIB 20 0 1059500200023 COMMON 4 3 1059500200024 EN-NRM-MIN EN-NRM-MAX MONIT ERR-2 1059500200025 KEV KEV B PER-CENT 1059500200026 10. 20. 2.55 2.4 1059500200027 ENDCOMMON 3 0 1059500200028 DATA 6 77 1059500200029 EN-MIN EN-MAX DATA ERR-T ERR-S ERR-1 1059500200030 KEV KEV B PER-CENT PER-CENT PER-CENT 1059500200031 5.0 5.5 3.987 3.7 1.5 2.4 1059500200032 5.5 6.0 4.171 3.7 1.6 2.3 1059500200033 6.0 6.5 3.445 3.7 1.7 2.2 1059500200034 6.5 7.0 3.284 3.6 1.8 2.1 1059500200035 7.0 7.5 3.434 3.6 1.8 2.0 1059500200036 7.5 8.0 3.217 3.6 2.0 1.9 1059500200037 8.0 8.5 2.797 3.7 2.2 1.9 1059500200038 8.5 9.0 3.260 3.6 2.0 1.8 1059500200039 9.0 9.5 3.255 3.5 2.0 1.7 1059500200040 9.5 10.0 3.208 3.5 2.0 1.7 1059500200041 10.0 11.0 2.754 3.3 1.5 1.6 1059500200042 11.0 12.0 2.803 3.3 1.5 1.6 1059500200043 12.0 13.0 2.526 3.3 1.7 1.6 1059500200044 13.0 14.0 2.815 3.3 1.6 1.5 1059500200045 14.0 15.0 2.685 3.3 1.7 1.5 1059500200046 15.0 16.0 2.356 3.4 1.9 1.5 1059500200047 16.0 17.0 2.385 3.4 1.9 1.5 1059500200048 17.0 18.0 2.267 3.4 1.9 1.5 1059500200049 18.0 19.0 2.513 3.4 1.9 1.5 1059500200050 19.0 20.0 2.360 3.4 1.9 1.4 1059500200051 20.0 22.0 2.168 3.1 1.4 1.4 1059500200052 22.0 24.0 2.262 3.1 1.4 1.4 1059500200053 24.0 26.0 2.143 3.1 1.4 1.4 1059500200054 26.0 28.0 2.161 3.2 1.6 1.4 1059500200055 28.0 30.0 2.114 3.4 1.9 1.4 1059500200056 30.0 32.0 2.046 3.3 1.8 1.5 1059500200057 32.0 34.0 2.079 3.6 1.8 1.9 1059500200058 34.0 36.0 2.025 4.0 2.2 2.4 1059500200059 36.0 38.0 1.935 3.8 2.1 2.1 1059500200060 38.0 40.0 1.883 3.5 1.9 1.6 1059500200061 40.0 42.0 1.874 3.3 1.9 1.3 1059500200062 42.0 44.0 1.824 3.3 1.9 1.3 1059500200063 44.0 46.0 1.801 3.3 1.9 1.3 1059500200064 46.0 48.0 1.792 3.3 1.9 1.3 1059500200065 48.0 50.0 1.848 3.3 1.9 1.3 1059500200066 50.0 54.0 1.798 3.1 1.5 1.3 1059500200067 54.0 58.0 1.813 3.1 1.4 1.3 1059500200068 58.0 62.0 1.794 3.1 1.4 1.3 1059500200069 62.0 66.0 1.754 3.1 1.5 1.3 1059500200070 66.0 70.0 1.681 3.1 1.5 1.3 1059500200071 70.0 74.0 1.703 3.1 1.5 1.2 1059500200072 74.0 78.0 1.622 3.1 1.6 1.2 1059500200073 78.0 82.0 1.608 3.1 1.6 1.2 1059500200074 82.0 86.0 1.612 3.3 1.8 1.3 1059500200075 86.0 90.0 1.620 3.4 1.9 1.5 1059500200076 90.0 94.0 1.587 3.4 1.8 1.5 1059500200077 94.0 98.0 1.646 3.2 1.7 1.3 1059500200078 98.0 100.0 1.604 3.2 1.7 1.3 1059500200079 100.0 105.0 1.561 3.6 1.5 2.2 1059500200080 105.0 110.0 1.513 3.2 1.5 1.5 1059500200081 110.0 115.0 1.459 3.1 1.6 1.3 1059500200082 115.0 120.0 1.524 3.1 1.5 1.3 1059500200083 120.0 125.0 1.506 3.2 1.6 1.3 1059500200084 125.0 130.0 1.482 3.1 1.5 1.3 1059500200085 130.0 135.0 1.398 3.2 1.6 1.4 1059500200086 135.0 140.0 1.441 3.5 1.5 2.0 1059500200087 140.0 145.0 1.404 3.4 1.8 1.6 1059500200088 145.0 150.0 1.445 3.3 1.8 1.4 1059500200089 150.0 160.0 1.443 4.2 1.2 3.3 1059500200090 160.0 170.0 1.398 4.2 1.2 3.3 1059500200091 170.0 180.0 1.393 3.5 1.2 2.2 1059500200092 180.0 190.0 1.412 3.0 1.2 1.4 1059500200093 190.0 200.0 1.348 3.2 1.2 1.7 1059500200094 200.0 220.0 1.357 2.9 0.9 1.3 1059500200095 220.0 240.0 1.302 2.9 0.9 1.3 1059500200096 240.0 260.0 1.256 2.9 0.9 1.3 1059500200097 260.0 280.0 1.204 2.9 0.9 1.3 1059500200098 280.0 300.0 1.174 2.9 0.9 1.3 1059500200099 300.0 340.0 1.196 2.8 0.7 1.3 1059500200100 340.0 380.0 1.203 2.8 0.7 1.3 1059500200101 380.0 400.0 1.196 2.9 0.7 1.4 1059500200102 400.0 450.0 1.169 3.0 0.6 1.7 1059500200103 450.0 500.0 1.164 3.3 0.7 2.1 1059500200104 500.0 550.0 1.129 3.2 0.6 2.0 1059500200105 550.0 600.0 1.130 3.1 0.6 1.9 1059500200106 600.0 700.0 1.122 3.1 0.5 1.9 1059500200107 700.0 800.0 1.108 3.1 0.5 2.0 1059500200108 ENDDATA 79 0 1059500200109 ENDSUBENT 108 0 1059500299999 SUBENT 10595003 20201130 14751059500300001 BIB 8 25 1059500300002 REACTION (92-U-235(N,F),,SIG,,AV) 1059500300003 METHOD (TOF) 23 m flight path 1059500300004 DETECTOR (GLASD) 6Li glass scintillator flux monitor 1059500300005 MONITOR ((MONIT)92-U-235(N,F),,INT) 1059500300006 Absolute normalization 1059500300007 (3-LI-6(N,T)2-HE-4,,SIG) 1059500300008 Shape normalization from ENDF/B-V 1059500300009 MONIT-REF (,W.P.Poenitz,R,ANL-NDM-45,1979) 235U(n,f) 1059500300010 (,L.Stewart+,R,LA-7663-MS,1979) 6Li(n,t) in ENDF/B-V 1059500300011 ERR-ANALYS (ERR-T) Total uncertainty 1059500300012 (ERR-S) Statistical uncertainty 1059500300013 (ERR-2) Backgrounds in detector and fission chamber 1059500300014 (ERR-3) Neutron scattering and transmission in 1059500300015 6Li glass detector 1059500300016 (ERR-4) 6Li(n,a) cross section uncertainty 1059500300017 (MONIT-ERR) Normalization of 235U in 7.8-11 eV interval1059500300018 STATUS (TABLE) Received from O.Wasson, 1981/12 (=Table A.II of1059500300019 Nucl.Sci.Eng.81(1982)196 with detailed uncertainties) 1059500300020 (COREL,10595002) 5 to 800 keV by hydrogen prop. counter1059500300021 HISTORY (19820112A) 003 and 004 combined. New data coded. 1059500300022 (19820426A) BIB corrections. 1059500300023 (19830330U) Data sorted. 1059500300024 (19860825A) Data units corrected. 1059500300025 (20170510A) On. ERR-1 deleted (equivalent to MONIT-ERR)1059500300026 (20201130A) On. MONIT-ERR=1.0 b*eV -> 0.4% 1059500300027 ENDBIB 25 0 1059500300028 COMMON 4 3 1059500300029 EN-NRM-MIN EN-NRM-MAX MONIT MONIT-ERR 1059500300030 EV EV B*EV PER-CENT 1059500300031 7.8 11.0 243.7 0.4 1059500300032 ENDCOMMON 3 0 1059500300033 DATA 8 13 1059500300034 EN-MIN EN-MAX DATA ERR-T ERR-S ERR-2 1059500300035 ERR-3 ERR-4 1059500300036 EV EV B PER-CENT PER-CENT PER-CENT 1059500300037 PER-CENT PER-CENT 1059500300038 7.4 10.0 87.1 1.2 0.8 0.7 1059500300039 0.0 0.0 1059500300040 7.8 11.0 76.2 1.2 0.8 0.7 1059500300041 0.0 0.0 1059500300042 10.0 15.0 44.5 1.3 1.0 0.7 1059500300043 0.0 0.0 1059500300044 10.7 17.6 39.2 1.6 1.4 0.7 1059500300045 0.1 0.0 1059500300046 15.0 20.5 60.0 1.4 1.0 0.7 1059500300047 0.1 0.0 1059500300048 22.0 33.0 35.1 1.4 1.0 0.7 1059500300049 0.2 0.0 1059500300050 22.6 29.0 44.1 1.5 1.2 0.7 1059500300051 0.2 0.0 1059500300052 800. 1000. 7.40 2.9 1.4 2.3 1059500300053 0.5 0.0 1059500300054 1000. 2000. 7.05 1.9 0.8 0.7 1059500300055 0.5 0.0 1059500300056 4000. 5000. 4.06 2.0 1.7 0.7 1059500300057 0.5 0.1 1059500300058 6000. 10000. 3.07 1.6 1.1 0.7 1059500300059 0.6 0.2 1059500300060 10000. 20000. 2.55 1.5 0.9 0.7 1059500300061 0.7 0.5 1059500300062 20000. 30000. 2.16 1.8 1.2 0.7 1059500300063 0.7 0.6 1059500300064 ENDDATA 30 0 1059500300065 ENDSUBENT 64 0 1059500399999 NOSUBENT 10595004 19820408 14321059500400001 SUBENT 10595005 20170510 14321059500500001 BIB 7 16 1059500500002 REACTION (92-U-235(N,F),,SIG,,AV) 1059500500003 METHOD (TOF) 200 m flight path 1059500500004 DETECTOR (PROPC) Hydrogen proportional counter flux monitor 1059500500005 MONITOR ((MONIT)92-U-235(N,F),,SIG) 1059500500006 Normalized to 2.55+/-0.05 b at 10-20 keV, 1059500500007 which is from 243.7+/-1.0 b*eV at 7.8-11.0 eV, 1059500500008 which is from thermal cross section of 583.54 b 1059500500009 (1-H-1(N,EL)1-H-1,,SIG) 1059500500010 Shape normalization from ENDF/B-V 1059500500011 ERR-ANALYS (ERR-S) Statistical uncertainty 1059500500012 (ERR-1) Shape systematic uncertainty 1059500500013 (ERR-T) Total uncertainty 1059500500014 (ERR-2) Normalization uncertainty 1059500500015 STATUS (TABLE) Table A.III of Nucl.Sci.Eng.81(1982)196 1059500500016 (COREL,10595002) Narrower group structure 1059500500017 HISTORY (20170510C) On 1059500500018 ENDBIB 16 0 1059500500019 COMMON 4 3 1059500500020 EN-NRM-MIN EN-NRM-MAX MONIT ERR-2 1059500500021 KEV KEV B PER-CENT 1059500500022 10. 20. 2.55 2.4 1059500500023 ENDCOMMON 3 0 1059500500024 DATA 6 18 1059500500025 EN-MIN EN-MAX DATA ERR-S ERR-1 ERR-T 1059500500026 KEV KEV B PER-CENT PER-CENT PER-CENT 1059500500027 5. 10. 3.403 0.7 1.9 3.1 1059500500028 10. 20. 2.550 0.5 1.5 2.9 1059500500029 20. 30. 2.170 0.8 1.4 2.9 1059500500030 30. 40. 1.994 0.9 1.9 3.2 1059500500031 40. 50. 1.828 0.9 1.3 2.9 1059500500032 50. 60. 1.803 1.0 1.4 3.0 1059500500033 60. 70. 1.733 1.0 1.5 3.0 1059500500034 70. 80. 1.651 1.0 1.6 3.0 1059500500035 80. 90. 1.614 1.0 1.8 3.2 1059500500036 90. 100. 1.614 1.0 1.4 3.0 1059500500037 100. 150. 1.473 0.5 1.5 2.9 1059500500038 150. 200. 1.400 0.5 2.4 3.4 1059500500039 200. 300. 1.259 0.4 1.3 2.8 1059500500040 300. 400. 1.200 0.5 1.3 2.8 1059500500041 400. 500. 1.167 0.5 1.9 3.1 1059500500042 500. 600. 1.130 0.4 2.0 3.1 1059500500043 600. 700. 1.122 0.5 1.9 3.1 1059500500044 700. 800. 1.108 0.5 2.0 3.1 1059500500045 ENDDATA 20 0 1059500500046 ENDSUBENT 45 0 1059500599999 ENDENTRY 5 0 1059599999999