ENTRY 20943 20210210 22972094300000001 SUBENT 20943001 20210210 22972094300100001 BIB 15 54 2094300100002 TITLE The 235U and 238U neutron induced fission cross 2094300100003 sections relative to the H(n,p) cross section 2094300100004 AUTHOR (B.Leugers, S.Cierjacks, P.Brotz, D.Erbe, D.Groeschel, 2094300100005 G.Schmalz, F.Voss) 2094300100006 INSTITUTE (2GERKFK) 2094300100007 REFERENCE (C,76ANL,,246,1976) 2094300100008 REL-REF (N,20409001,S.Cierjacks+,C,76ANL,,94,1976) 2094300100009 238U(n,f)/235U(n,f) ratio from the same experiment 2094300100010 FACILITY (ISOCY,2GERKFK) 2094300100011 INC-SOURCE 50 MeV deuterons on thick natural uranium 2094300100012 SAMPLE Uranium foils (~400 ug/cm2 thick, 7 cm diameter). 2094300100013 METHOD (TOF) 57 m flight path 2094300100014 DETECTOR (SCIN) 9 gas scintillation chambers (85% Ar+15% N) 2094300100015 for fission fragment detection 2094300100016 (TELES) Proton recoil detector for neutron flux 2094300100017 measurements. 2094300100018 MONITOR (1-H-1(N,EL)1-H-1,,SIG) 2094300100019 CORRECTION Corrected for 2094300100020 - time-independent background, 2094300100021 - energy-dependent detector efficiency, 2094300100022 - electronic threshold and dead time, 2094300100023 - sample mass and isotopic composition, 2094300100024 - flux detector threshold. 2094300100025 ERR-ANALYS (ERR-S) Statistical uncertainty including 2094300100026 - contributions from background subtraction, 2094300100027 - isotopic corrections for U-238. 2094300100028 (ERR-SYS) Total systematic error including 2094300100029 - energy-dependent time-dependent background, 2094300100030 - energy-dependent detector efficiency. 2094300100031 There is also a 1% contribution from dead time and 2094300100032 electronic losses. 2094300100033 Sample mass and isotopic composition give negligible 2094300100034 errors. 2094300100035 The largest contribution is from neutron flux 2094300100036 measurement including the relative efficiencies for 2094300100037 proton detection in the 2094300100038 - fission counters, 2094300100039 - (n,p) cross section (2%), 2094300100040 - flux measurement itself (1-2%) 2094300100041 STATUS Note added by the editors of C,76ANL,,246,1976: 2094300100042 The data reported for the ratio of U-238/U-235 and 2094300100043 the absolute values for U-238 and for U-235 (based on 2094300100044 the hydrogen reference cross section) are both from a 2094300100045 single measurement. However, the normalization of the 2094300100046 data is somewhat different for the ratio then it is 2094300100047 for the individual cross sections. 2094300100048 HISTORY (19790503C) CN. 2094300100049 (19790626E) 2094300100050 (19801119A) ERR-ANALYS changed 2094300100051 (19801204E) 2094300100052 (20071218A) Date is corrected 2094300100053 (20071218U) ERR-1 changed to ERR-SYS 2094300100054 (20190722A) On. Major revisions in 002 and 003. 2094300100055 (20210210A) On. Major revision in 002. 2094300100056 ENDBIB 54 0 2094300100057 NOCOMMON 0 0 2094300100058 ENDSUBENT 57 0 2094300199999 SUBENT 20943002 20210210 22972094300200001 BIB 6 13 2094300200002 REACTION (92-U-235(N,F),,SIG) 2094300200003 MONITOR (92-U-235(N,F),,SIG) 2094300200004 SAMPLE 235U sample: 235U (93.331%), 234U (1.080%), 2094300200005 236U (0.202%), 238U (5.387%) 2094300200006 COMMENT By Friedrich Voss (2021-03-01): 2094300200007 All data published in 76ANL and KfK-2673 are from the 2094300200008 same measurement. 2094300200009 STATUS (TABLE) Table I of C,76ANL,,246,1976 2094300200010 (COREL,20409002) 238U(n,f)/235U(n,f) ratio from the 2094300200011 same run 2094300200012 (SPSDD,20786006) Data from later analysis 2094300200013 HISTORY (20190722A) On. MONIT added. 2094300200014 (20210210A) On. STATUS=SPSDD added. 2094300200015 ENDBIB 13 0 2094300200016 COMMON 2 3 2094300200017 EN-NRM MONIT 2094300200018 MEV B 2094300200019 14. 2.136 2094300200020 ENDCOMMON 3 0 2094300200021 DATA 4 144 2094300200022 EN DATA ERR-S ERR-SYS 2094300200023 MEV B PER-CENT PER-CENT 2094300200024 20.075 1.947 1.1 8.0 2094300200025 19.641 1.947 1.1 8.0 2094300200026 19.221 2.026 1.0 7.5 2094300200027 18.814 2.079 1.0 7.5 2094300200028 18.420 2.119 1.0 7.0 2094300200029 18.039 2.158 1.0 7.0 2094300200030 17.670 2.167 1.0 6.5 2094300200031 17.311 2.164 1.0 6.5 2094300200032 16.964 2.211 1.0 6.5 2094300200033 16.627 2.221 1.0 6.0 2094300200034 16.301 2.220 1.0 6.0 2094300200035 15.983 2.312 0.9 6.0 2094300200036 15.675 2.276 1.0 5.5 2094300200037 15.376 2.274 1.0 5.5 2094300200038 15.086 2.242 1.0 5.5 2094300200039 14.803 2.213 1.0 5.0 2094300200040 14.529 2.186 1.0 5.0 2094300200041 14.262 2.100 1.0 5.0 2094300200042 14.003 2.136 1.0 4.0 2094300200043 13.750 2.130 1.1 4.0 2094300200044 13.505 2.040 1.1 4.0 2094300200045 13.266 2.013 1.1 4.0 2094300200046 13.033 1.954 1.2 4.0 2094300200047 12.807 1.924 1.2 4.0 2094300200048 12.586 1.822 1.2 4.0 2094300200049 12.371 1.795 1.3 4.0 2094300200050 12.161 1.763 1.3 4.0 2094300200051 12.038 1.773 2.1 4.0 2094300200052 11.957 1.759 1.7 4.0 2094300200053 11.837 1.669 2.2 4.0 2094300200054 11.758 1.719 1.8 4.0 2094300200055 11.641 1.748 1.8 4.0 2094300200056 11.526 1.759 2.2 4.0 2094300200057 11.450 1.740 1.8 4.0 2094300200058 11.337 1.723 1.8 4.0 2094300200059 11.227 1.698 2.3 4.0 2094300200060 11.154 1.705 1.9 4.0 2094300200061 11.046 1.720 1.9 4.0 2094300200062 10.939 1.723 1.9 4.0 2094300200063 10.834 1.670 2.4 4.0 2094300200064 10.765 1.741 1.9 4.0 2094300200065 10.663 1.688 2.0 4.0 2094300200066 10.562 1.675 2.0 4.0 2094300200067 10.462 1.712 2.0 4.0 2094300200068 10.364 1.722 2.0 4.0 2094300200069 10.235 1.739 1.8 4.0 2094300200070 10.140 1.746 2.1 4.0 2094300200071 10.046 1.700 2.1 4.0 2094300200072 9.954 1.726 2.1 4.0 2094300200073 9.833 1.718 1.9 4.0 2094300200074 9.743 1.717 2.2 4.0 2094300200075 9.655 1.738 2.2 4.0 2094300200076 9.539 1.741 1.9 4.0 2094300200077 9.454 1.806 2.2 4.0 2094300200078 9.342 1.735 2.0 4.0 2094300200079 9.232 1.697 2.0 4.0 2094300200080 9.150 1.731 2.3 4.0 2094300200081 9.044 1.706 2.1 4.0 2094300200082 8.939 1.741 2.1 4.0 2094300200083 8.836 1.791 2.1 4.0 2094300200084 8.734 1.751 2.1 4.0 2094300200085 8.635 1.819 2.1 4.0 2094300200086 8.537 1.724 2.2 4.0 2094300200087 8.441 1.750 2.2 4.0 2094300200088 8.346 1.717 2.3 4.0 2094300200089 8.253 1.774 2.0 4.0 2094300200090 8.139 1.745 2.3 4.0 2094300200091 8.050 1.630 2.2 4.0 2094300200092 7.940 1.712 2.4 4.0 2094300200093 7.853 1.771 2.2 4.0 2094300200094 7.748 1.704 2.2 4.0 2094300200095 7.644 1.701 2.3 4.0 2094300200096 7.542 1.730 2.3 4.0 2094300200097 7.443 1.689 2.3 4.0 2094300200098 7.345 1.650 2.4 4.0 2094300200099 7.249 1.603 2.5 4.0 2094300200100 7.155 1.595 2.5 4.0 2094300200101 7.045 1.461 2.4 4.0 2094300200102 6.937 1.497 2.4 4.0 2094300200103 6.849 1.558 2.6 4.0 2094300200104 6.746 1.397 2.6 4.0 2094300200105 6.645 1.424 2.6 4.0 2094300200106 6.547 1.305 2.7 4.0 2094300200107 6.450 1.285 2.6 4.0 2094300200108 6.340 1.151 3.0 4.0 2094300200109 6.248 1.191 2.8 4.0 2094300200110 6.143 1.173 3.1 4.0 2094300200111 6.056 1.098 3.0 4.0 2094300200112 5.956 1.108 3.0 4.0 2094300200113 5.844 1.037 2.9 4.0 2094300200114 5.750 1.071 3.1 4.0 2094300200115 5.644 1.008 3.0 4.0 2094300200116 5.541 1.078 2.9 4.0 2094300200117 5.442 1.073 3.0 4.0 2094300200118 5.344 1.050 3.0 4.0 2094300200119 5.250 1.096 2.8 4.0 2094300200120 5.146 1.078 2.9 4.0 2094300200121 5.046 1.078 2.9 4.0 2094300200122 4.949 1.142 2.8 4.0 2094300200123 4.843 1.172 2.7 4.0 2094300200124 4.742 1.152 2.7 4.0 2094300200125 4.643 1.169 2.7 4.0 2094300200126 4.548 1.189 2.6 4.0 2094300200127 4.446 1.143 2.6 4.0 2094300200128 4.348 1.116 2.7 4.0 2094300200129 4.244 1.149 2.5 4.0 2094300200130 4.144 1.176 2.5 4.0 2094300200131 4.048 1.187 2.4 4.0 2094300200132 3.947 1.186 2.4 4.0 2094300200133 3.850 1.212 2.4 4.0 2094300200134 3.750 1.146 2.3 4.0 2094300200135 3.647 1.164 2.3 4.0 2094300200136 3.547 1.177 2.2 4.0 2094300200137 3.446 1.167 2.2 4.0 2094300200138 3.349 1.182 2.1 4.0 2094300200139 3.250 1.183 2.1 4.0 2094300200140 3.151 1.218 1.9 4.0 2094300200141 3.050 1.206 2.0 4.0 2094300200142 2.950 1.264 1.8 5.0 2094300200143 2.849 1.237 1.8 5.0 2094300200144 2.750 1.247 1.8 5.0 2094300200145 2.647 1.203 1.8 5.0 2094300200146 2.549 1.257 1.7 5.0 2094300200147 2.450 1.245 1.6 5.0 2094300200148 2.349 1.290 1.6 5.0 2094300200149 2.248 1.276 1.5 5.0 2094300200150 2.147 1.325 1.5 5.0 2094300200151 2.047 1.274 1.5 5.5 2094300200152 1.973 1.308 2.1 5.5 2094300200153 1.923 1.286 2.0 6.0 2094300200154 1.872 1.273 2.1 6.0 2094300200155 1.824 1.290 2.0 6.0 2094300200156 1.775 1.280 2.1 6.5 2094300200157 1.726 1.308 2.0 6.5 2094300200158 1.674 1.275 2.0 6.5 2094300200159 1.625 1.244 2.0 7.0 2094300200160 1.574 1.291 2.0 7.0 2094300200161 1.524 1.293 1.9 7.0 2094300200162 1.474 1.291 1.9 7.5 2094300200163 1.424 1.232 2.0 7.5 2094300200164 1.374 1.264 1.9 7.5 2094300200165 1.324 1.278 1.9 8.0 2094300200166 1.274 1.211 1.9 8.0 2094300200167 1.224 1.252 1.9 8.0 2094300200168 ENDDATA 146 0 2094300200169 ENDSUBENT 168 0 2094300299999 SUBENT 20943003 20210210 22972094300300001 BIB 5 8 2094300300002 REACTION (92-U-238(N,F),,SIG) 2094300300003 MONITOR (92-U-238(N,F),,SIG) 2094300300004 SAMPLE 238U sample: 235U/238U composition ratio=0.0001755 2094300300005 STATUS (TABLE) Table II of C,76ANL,,246,1976 2094300300006 (COREL,20409002) 238U(n,f)/235U(n,f) ratio from the 2094300300007 same run 2094300300008 HISTORY (20190722A) On. MONIT added. 2094300300009 (20210210U) On. STATUS=COREL added. 2094300300010 ENDBIB 8 0 2094300300011 COMMON 2 3 2094300300012 EN-NRM MONIT 2094300300013 MEV B 2094300300014 14. 1.207 2094300300015 ENDCOMMON 3 0 2094300300016 DATA 4 144 2094300300017 EN DATA ERR-S ERR-SYS 2094300300018 MEV B PER-CENT PER-CENT 2094300300019 20.075 1.424 1.3 8.0 2094300300020 19.641 1.397 1.3 8.0 2094300300021 19.221 1.404 1.3 8.0 2094300300022 18.814 1.419 1.2 7.5 2094300300023 18.420 1.400 1.2 7.5 2094300300024 18.039 1.377 1.2 7.0 2094300300025 17.670 1.381 1.2 7.0 2094300300026 17.311 1.404 1.2 6.5 2094300300027 16.964 1.369 1.2 6.5 2094300300028 16.627 1.421 1.2 6.5 2094300300029 16.301 1.449 1.2 6.0 2094300300030 15.983 1.449 1.2 6.0 2094300300031 15.675 1.404 1.2 6.0 2094300300032 15.376 1.390 1.2 5.5 2094300300033 15.086 1.344 1.3 5.5 2094300300034 14.803 1.290 1.3 5.5 2094300300035 14.529 1.219 1.3 5.0 2094300300036 14.262 1.192 1.4 5.0 2094300300037 14.003 1.207 1.4 4.0 2094300300038 13.750 1.156 1.4 4.0 2094300300039 13.505 1.153 1.5 4.0 2094300300040 13.266 1.103 1.5 4.0 2094300300041 13.033 1.070 1.6 4.0 2094300300042 12.807 1.018 1.6 4.0 2094300300043 12.586 0.994 1.7 4.0 2094300300044 12.371 1.008 1.7 4.0 2094300300045 12.161 1.037 1.7 4.0 2094300300046 12.038 1.053 2.7 4.0 2094300300047 11.957 1.031 2.2 4.0 2094300300048 11.837 0.998 2.8 4.0 2094300300049 11.758 1.013 2.3 4.0 2094300300050 11.641 1.009 2.3 4.0 2094300300051 11.526 1.005 2.9 4.0 2094300300052 11.450 1.012 2.4 4.0 2094300300053 11.337 1.049 2.3 4.0 2094300300054 11.227 1.031 2.9 4.0 2094300300055 11.154 1.010 2.4 4.0 2094300300056 11.046 0.998 2.5 4.0 2094300300057 10.939 0.971 2.5 4.0 2094300300058 10.834 1.016 3.0 4.0 2094300300059 10.765 0.976 2.6 4.0 2094300300060 10.663 0.958 2.6 4.0 2094300300061 10.562 0.977 2.6 4.0 2094300300062 10.462 1.056 2.5 4.0 2094300300063 10.364 0.982 2.7 4.0 2094300300064 10.235 1.021 2.3 4.0 2094300300065 10.140 0.968 2.8 4.0 2094300300066 10.046 0.983 2.8 4.0 2094300300067 9.954 0.976 2.8 4.0 2094300300068 9.833 0.995 2.4 4.0 2094300300069 9.743 1.017 2.8 4.0 2094300300070 9.655 0.948 2.9 4.0 2094300300071 9.539 0.949 2.6 4.0 2094300300072 9.454 1.006 2.9 4.0 2094300300073 9.342 0.967 2.6 4.0 2094300300074 9.232 0.991 2.6 4.0 2094300300075 9.150 0.987 3.1 4.0 2094300300076 9.044 0.955 2.7 4.0 2094300300077 8.939 1.012 2.7 4.0 2094300300078 8.836 0.974 2.8 4.0 2094300300079 8.734 0.961 2.9 4.0 2094300300080 8.635 1.049 2.8 4.0 2094300300081 8.537 0.986 2.9 4.0 2094300300082 8.441 1.002 2.9 4.0 2094300300083 8.346 0.961 3.0 4.0 2094300300084 8.253 0.955 2.8 4.0 2094300300085 8.139 0.966 3.1 4.0 2094300300086 8.050 0.972 2.8 4.0 2094300300087 7.940 0.981 3.2 4.0 2094300300088 7.853 1.009 2.9 4.0 2094300300089 7.748 0.970 3.0 4.0 2094300300090 7.644 0.918 3.1 4.0 2094300300091 7.542 0.968 3.1 4.0 2094300300092 7.443 0.964 3.1 4.0 2094300300093 7.345 0.926 3.2 4.0 2094300300094 7.249 0.930 3.2 4.0 2094300300095 7.155 0.918 3.3 4.0 2094300300096 7.045 0.908 3.1 4.0 2094300300097 6.937 0.951 3.0 4.0 2094300300098 6.849 0.910 3.5 4.0 2094300300099 6.746 0.916 3.2 4.0 2094300300100 6.645 0.842 3.4 4.0 2094300300101 6.547 0.826 3.4 4.0 2094300300102 6.450 0.751 3.4 4.0 2094300300103 6.340 0.718 3.8 4.0 2094300300104 6.248 0.646 3.8 4.0 2094300300105 6.143 0.639 4.1 4.0 2094300300106 6.056 0.672 3.8 4.0 2094300300107 5.956 0.560 4.2 4.0 2094300300108 5.844 0.532 4.1 4.0 2094300300109 5.750 0.531 4.4 4.0 2094300300110 5.644 0.520 4.2 4.0 2094300300111 5.541 0.528 4.2 4.0 2094300300112 5.442 0.557 4.1 4.0 2094300300113 5.344 0.533 4.3 4.0 2094300300114 5.250 0.514 4.1 4.0 2094300300115 5.146 0.525 4.1 4.0 2094300300116 5.046 0.500 4.3 4.0 2094300300117 4.949 0.534 4.1 4.0 2094300300118 4.843 0.570 3.8 4.0 2094300300119 4.742 0.543 3.9 4.0 2094300300120 4.643 0.592 3.8 4.0 2094300300121 4.548 0.561 3.7 4.0 2094300300122 4.446 0.564 3.7 4.0 2094300300123 4.348 0.560 3.7 4.0 2094300300124 4.244 0.568 3.6 4.0 2094300300125 4.144 0.558 3.6 4.0 2094300300126 4.048 0.557 3.5 4.0 2094300300127 3.947 0.561 3.5 4.0 2094300300128 3.850 0.536 3.5 4.0 2094300300129 3.750 0.575 3.2 4.0 2094300300130 3.647 0.566 3.3 4.0 2094300300131 3.547 0.542 3.2 4.0 2094300300132 3.446 0.567 3.1 4.0 2094300300133 3.349 0.511 3.2 4.0 2094300300134 3.250 0.507 3.2 4.0 2094300300135 3.151 0.538 2.9 4.0 2094300300136 3.050 0.519 3.0 4.0 2094300300137 2.950 0.540 2.8 5.0 2094300300138 2.849 0.527 2.8 5.0 2094300300139 2.750 0.529 2.7 5.0 2094300300140 2.647 0.534 2.6 5.0 2094300300141 2.549 0.516 2.6 5.0 2094300300142 2.450 0.519 2.5 5.0 2094300300143 2.349 0.508 2.5 5.0 2094300300144 2.248 0.542 2.4 5.0 2094300300145 2.147 0.534 2.4 5.5 2094300300146 2.047 0.531 2.3 5.5 2094300300147 1.973 0.535 3.3 5.5 2094300300148 1.923 0.497 3.3 6.0 2094300300149 1.872 0.535 3.2 6.0 2094300300150 1.824 0.523 3.2 6.0 2094300300151 1.775 0.495 3.3 6.5 2094300300152 1.726 0.446 3.4 6.5 2094300300153 1.674 0.457 3.3 6.5 2094300300154 1.625 0.451 3.3 7.0 2094300300155 1.574 0.433 3.4 7.0 2094300300156 1.524 0.390 3.5 7.0 2094300300157 1.474 0.352 3.7 7.5 2094300300158 1.424 0.265 4.3 7.5 2094300300159 1.374 0.171 5.2 7.5 2094300300160 1.324 0.104 6.6 8.0 2094300300161 1.274 0.087 7.2 8.0 2094300300162 1.224 0.053 9.1 8.0 2094300300163 ENDDATA 146 0 2094300300164 ENDSUBENT 163 0 2094300399999 ENDENTRY 3 0 2094399999999