ENTRY 10428 20201130 14751042800000001 SUBENT 10428001 20201130 14751042800100001 BIB 13 38 1042800100002 TITLE Fission cross section of uranium-235 from 3 to 20 MeV 1042800100003 AUTHOR (J.B.Czirr, G.S.Sidhu) 1042800100004 INSTITUTE (1USALRL) 1042800100005 REFERENCE (J,NSE,57,18,1975) 1042800100006 (C,75WASH,2,615,1975) 1042800100007 (R,UCRL-76676,1975) 1042800100008 REL-REF (O,10558002,J.B.Czirr+,J,NSE,58,371,1975) 1042800100009 Data from 0.75 to 4.1 MeV 1042800100010 FACILITY (LINAC,1USALRL) 100-MeV electron linac 1042800100011 INC-SOURCE (PHOTO) 100-MeV electrons on thick Ta target. 1042800100012 Repetition rate of 1440 Hz, pulse width of 10 ns, 1042800100013 time-analyzer channel width of 16 ns. 1042800100014 SAMPLE CH2 radiator foil (3.30 mg/cm2 thick). 1042800100015 (92-U-235,ENR=0.999) 1042800100016 Ten 235U (99.9% enrichment) foils (~0.1 mg/cm2 thick 1042800100017 for each). 1042800100018 METHOD (TOF) flight path of 37.63(1) m for fission chamber, 1042800100019 60.41(1) m for proton recoil detector 1042800100020 Energy calibrated using narrow carbon resonance at 1042800100021 2077+/-2 keV. 1042800100022 DETECTOR (FISCH) Parallel-plate fission chamber 1042800100023 (SILI) 2-mm thick Si(Li) detector for recoil proton 1042800100024 detection 1042800100025 CORRECTION Corrected for 1042800100026 - timing error due to time shift vs pulse height, 1042800100027 - n-p scattering angular distribution, 1042800100028 - fission fragment angular distribution, 1042800100029 - detector efficiency, 1042800100030 - dead-time, 1042800100031 - flux perturbation. 1042800100032 STATUS (APRVD) Approved by author 1975/8/8. 1042800100033 HISTORY (19741008C) 1042800100034 (19760302A) Corrected data as sent by author 1042800100035 (19830207A) Converted to REACTION formalism 1042800100036 (19830607A) BIB, COMMON updated. 1042800100037 (20030408A) Converted to new date formats, lower case. 1042800100038 (20110112A) VM. BIB updates. Updates to subentry 002. 1042800100039 (20201130A) On. ERR-ANALYS moved to 002 and revised. 1042800100040 ENDBIB 38 0 1042800100041 NOCOMMON 0 0 1042800100042 ENDSUBENT 41 0 1042800199999 SUBENT 10428002 20201130 14751042800200001 BIB 7 28 1042800200002 REACTION 1(92-U-235(N,F),,SIG,,REL) 1042800200003 2(92-U-235(N,F),,SIG) 1042800200004 MONITOR (1-H-1(N,EL)1-H-1,,SIG) 1042800200005 1Average between 3 and 4 MeV normalized to 1.000. 1042800200006 2((MONIT)92-U-235(N,F),,SIG,,AV) 1042800200007 MONIT-REF (,L.Stewart+,R,LA-4574,1971) n-p cross section 1042800200008 2((MONIT)10333001,W.P.Poenitz,J,NSE,53,370,1974) 1042800200009 ERR-ANALYS (ERR-S) Statistical uncertainty (standard deviation) 1042800200010 due to fission rate, flux rate and flux background. 1042800200011 (ERR-SYS) Systematic uncertainty (rms) taking into 1042800200012 account 1042800200013 - pulse height versus time shift 1042800200014 - (n,p) angular distribution 1042800200015 - fission-fragment angular distribution 1042800200016 - dead-time correction 1042800200017 - flux perturbation 1042800200018 - background (fission chamber and flux monitor) 1042800200019 - energy scale (fission chamber v.s. flux monitor) 1042800200020 - absolute energy scale 1042800200021 - pulse-height bias. 1042800200022 FLAG (1.) Systematic uncertainty negligible (0.1%) 1042800200023 STATUS (TABLE) Table II of Nucl.Sci.Eng.57(1975)18 and 1042800200024 private communication, Czirr, December 1975. 1042800200025 HISTORY (19751202R) Absolute cross sections received from Czirr1042800200026 (19830207A) Data below 3 MeV deleted. Not from this 1042800200027 experiment. 1042800200028 (20110112A) Data error headings updated. 1042800200029 (20201130A) On. ERR-ANALYS moved from 001 and revised. 1042800200030 ENDBIB 28 0 1042800200031 COMMON 3 3 1042800200032 EN-NRM-MIN2EN-NRM-MAX2MONIT 2 1042800200033 MEV MEV MB 1042800200034 3. 4. 1198. 1042800200035 ENDCOMMON 3 0 1042800200036 DATA 6 61 1042800200037 EN DATA 1ERR-S DATA 2ERR-SYS FLAG 1042800200038 MEV ARB-UNITS PER-CENT B PER-CENT NO-DIM 1042800200039 2.99 1.043 0.9 1.249 1. 1042800200040 3.05 1.032 0.9 1.237 1. 1042800200041 3.12 1.031 0.9 1.235 1. 1042800200042 3.18 1.012 0.9 1.212 1. 1042800200043 3.25 1.008 0.9 1.207 1. 1042800200044 3.32 0.991 0.9 1.187 1. 1042800200045 3.40 0.990 0.9 1.186 1. 1042800200046 3.47 0.999 0.9 1.197 1. 1042800200047 3.55 0.990 0.9 1.186 1. 1042800200048 3.63 0.988 0.9 1.184 1. 1042800200049 3.71 1.000 1.0 1.198 1. 1042800200050 3.80 0.985 1.0 1.180 1. 1042800200051 3.89 0.989 1.0 1.185 1. 1042800200052 3.98 0.982 1.0 1.177 1. 1042800200053 4.07 0.983 1.0 1.178 0.1 1042800200054 4.17 0.978 1.0 1.172 0.1 1042800200055 4.27 0.958 1.0 1.148 0.2 1042800200056 4.38 0.950 1.0 1.139 0.2 1042800200057 4.49 0.959 1.0 1.150 0.3 1042800200058 4.60 0.950 1.0 1.139 0.3 1042800200059 4.72 0.938 1.0 1.125 0.3 1042800200060 4.85 0.927 1.0 1.112 0.3 1042800200061 4.98 0.929 1.0 1.115 0.3 1042800200062 5.11 0.911 1.0 1.093 0.3 1042800200063 5.25 0.906 1.0 1.087 0.3 1042800200064 5.39 0.908 1.0 1.090 0.4 1042800200065 5.54 0.894 1.0 1.073 0.4 1042800200066 5.70 0.886 1.0 1.064 0.4 1042800200067 5.87 0.893 1.0 1.073 0.4 1042800200068 6.04 0.949 1.0 1.140 0.4 1042800200069 6.22 1.024 0.9 1.230 0.4 1042800200070 6.40 1.114 0.9 1.338 0.4 1042800200071 6.60 1.198 0.9 1.439 0.5 1042800200072 6.81 1.282 0.9 1.540 0.6 1042800200073 7.02 1.337 0.9 1.607 0.7 1042800200074 7.25 1.408 0.9 1.692 0.8 1042800200075 7.48 1.462 1.0 1.757 0.8 1042800200076 7.73 1.494 1.0 1.795 0.9 1042800200077 7.99 1.521 1.0 1.828 0.9 1042800200078 8.27 1.525 1.1 1.833 0.9 1042800200079 8.55 1.519 1.1 1.826 0.9 1042800200080 8.86 1.511 1.2 1.817 0.9 1042800200081 9.18 1.496 1.2 1.799 0.9 1042800200082 9.52 1.482 1.3 1.782 1.0 1042800200083 9.88 1.516 1.3 1.823 1.0 1042800200084 10.25 1.509 1.3 1.815 1.0 1042800200085 10.66 1.480 1.3 1.780 1.1 1042800200086 11.08 1.487 1.4 1.789 1.1 1042800200087 11.53 1.462 1.5 1.759 1.1 1042800200088 12.01 1.482 1.6 1.784 1.1 1042800200089 12.52 1.528 1.6 1.839 1.1 1042800200090 13.06 1.596 1.7 1.922 1.0 1042800200091 13.64 1.680 1.8 2.023 1.0 1042800200092 14.26 1.730 1.9 2.084 1.0 1042800200093 14.93 1.732 2.0 2.087 1.0 1042800200094 15.64 1.739 3.7 2.096 1.1 1042800200095 16.40 1.660 3.8 2.001 1.1 1042800200096 17.22 1.627 3.9 1.962 1.1 1042800200097 18.11 1.616 3.4 1.950 1.1 1042800200098 19.07 1.639 4.1 1.978 1.2 1042800200099 20.10 1.696 6.2 2.048 1.2 1042800200100 ENDDATA 63 0 1042800200101 ENDSUBENT 100 0 1042800299999 ENDENTRY 2 0 1042899999999