ENTRY L0185 20131209 L023L018500000001 SUBENT L0185001 20131209 L023L018500100001 BIB 11 32 L018500100002 TITLE Experimental Determination of Photofission Neutron L018500100003 Multiplicities for 235U, 236U, 238U, and 232Th Using L018500100004 Monoenergetic Photons L018500100005 AUTHOR (J.T.Caldwell,E.J.Dowdy,R.A.Alvarez,B.L.Berman,P.Meyer)L018500100006 REFERENCE (J,NSE,73,(2),153,1980) L018500100007 REL-REF (I,,B.L.Berman+,J,RMP,47,713,1975) L018500100008 INSTITUTE (1USALAS,1USALRL) L018500100009 FACILITY (LINAC,1USALRL) L018500100010 INC-SOURCE (ARAD) Monoenergetic photons were produced by the L018500100011 technique of fast-positron annihilation in flight. L018500100012 PART-DET (N) L018500100013 DETECTOR (BF3) The neutron detector consisted of a 61-cm cube L018500100014 of paraffin in which were embeded forty-eight L018500100015 51-cm-long, 2.54-cm-diam high-pressure BF3 L018500100016 proportional counters. The detector efficiency is ~40 L018500100017 (1.2)% for a typical prompt fission neutron spectrum L018500100018 and ~45(1.3)% for a typical delayed neutron spectrum. L018500100019 METHOD (COINC,RINGR) Logic pulses originating from L018500100020 each ring of BF3 counters are presented to an on-line L018500100021 computing system. The on-line data acquisition system L018500100022 was programmed to record multiple-coincidence L018500100023 information obtained following each beam burst. In L018500100024 addition, the individual ring totals in coincidence L018500100025 with one-, two-, and three-fold events as well as the L018500100026 ring totals for all events were recorded. These data L018500100027 totals were used to determine neutron spectral L018500100028 information for individual reactions (gamma,n), L018500100029 (gamma,2n), (gamma,F), and (gamma,nF). Delayed neutronL018500100030 data were acquired by counting neutron events between L018500100031 beam bursts at times such that entire prompt neutron L018500100032 response had decayed away. L018500100033 HISTORY (20131209C) BP L018500100034 ENDBIB 32 0 L018500100035 NOCOMMON 0 0 L018500100036 ENDSUBENT 35 0 L018500199999 SUBENT L0185002 20131209 L023L018500200001 BIB 4 6 L018500200002 REACTION (92-U-235(G,F),PR,NU) L018500200003 STATUS (CURVE) Fig. 7, page 161. L018500200004 SAMPLE (92-U-235,ENR=0.9323) Metal cylinder and U3O8 cylinder,L018500200005 contaminants 234U-1%, 236U-0.36%, and 238U-5.41%. L018500200006 ERR-ANALYS (DATA-ERR) Dominated by statistical errors. L018500200007 (ERR-1) Detector efficiency error. L018500200008 ENDBIB 6 0 L018500200009 COMMON 1 3 L018500200010 ERR-1 L018500200011 PER-CENT L018500200012 1.2 L018500200013 ENDCOMMON 3 0 L018500200014 DATA 3 29 L018500200015 EN DATA DATA-ERR L018500200016 MEV PRT/FIS PRT/FIS L018500200017 6.516 2.453 0.147 L018500200018 7.232 2.539 0.147 L018500200019 7.732 2.444 0.129 L018500200020 8.068 2.625 0.147 L018500200021 8.571 2.768 0.184 L018500200022 9.073 2.875 0.128 L018500200023 9.572 2.706 0.074 L018500200024 10.050 2.740 0.092 L018500200025 10.532 3.177 0.129 L018500200026 11.031 2.971 0.092 L018500200027 11.534 3.151 0.110 L018500200028 12.011 3.111 0.110 L018500200029 12.156 3.257 0.092 L018500200030 12.395 3.292 0.092 L018500200031 12.512 3.108 0.128 L018500200032 12.633 3.308 0.092 L018500200033 12.873 3.362 0.092 L018500200034 12.992 3.398 0.165 L018500200035 13.134 3.268 0.092 L018500200036 13.373 3.340 0.110 L018500200037 13.491 3.174 0.129 L018500200038 13.613 3.393 0.092 L018500200039 13.968 3.189 0.128 L018500200040 14.497 3.534 0.129 L018500200041 14.974 3.512 0.202 L018500200042 15.477 3.674 0.129 L018500200043 16.218 3.797 0.183 L018500200044 16.957 3.773 0.257 L018500200045 17.912 3.822 0.202 L018500200046 ENDDATA 31 0 L018500200047 ENDSUBENT 46 0 L018500299999 SUBENT L0185003 20131209 L023L018500300001 BIB 4 6 L018500300002 REACTION (92-U-236(G,F),PR,NU) L018500300003 STATUS (CURVE) Fig. 7, page 161. L018500300004 SAMPLE (92-U-236,ENR=0.8928) U3O8 cylinder, contaminants L018500300005 234U-0.13%, 235U-9.27%, and 238U-1.31%. L018500300006 ERR-ANALYS (DATA-ERR) Dominated by statistical errors. L018500300007 (ERR-1) Detector efficiency error. L018500300008 ENDBIB 6 0 L018500300009 COMMON 1 3 L018500300010 ERR-1 L018500300011 PER-CENT L018500300012 1.2 L018500300013 ENDCOMMON 3 0 L018500300014 DATA 3 35 L018500300015 EN DATA DATA-ERR L018500300016 MEV PRT/FIS PRT/FIS L018500300017 6.501 2.374 0.224 L018500300018 7.217 2.561 0.318 L018500300019 7.455 2.523 0.299 L018500300020 7.718 2.897 0.243 L018500300021 7.932 3.178 0.299 L018500300022 8.195 2.598 0.336 L018500300023 8.457 2.878 0.280 L018500300024 8.696 3.140 0.299 L018500300025 8.911 2.841 0.243 L018500300026 9.435 2.916 0.187 L018500300027 9.936 2.841 0.168 L018500300028 10.390 3.178 0.131 L018500300029 10.533 3.047 0.131 L018500300030 10.891 3.103 0.093 L018500300031 11.249 3.327 0.131 L018500300032 11.392 3.346 0.112 L018500300033 11.535 3.084 0.093 L018500300034 11.750 3.159 0.075 L018500300035 11.869 3.327 0.131 L018500300036 11.988 2.991 0.093 L018500300037 12.227 3.346 0.112 L018500300038 12.370 3.346 0.150 L018500300039 12.513 3.215 0.131 L018500300040 12.728 3.364 0.093 L018500300041 12.871 3.271 0.168 L018500300042 12.990 3.346 0.093 L018500300043 13.229 3.308 0.075 L018500300044 13.348 3.589 0.150 L018500300045 13.825 3.458 0.262 L018500300046 14.350 3.495 0.168 L018500300047 14.827 3.645 0.150 L018500300048 15.328 3.645 0.131 L018500300049 15.829 3.533 0.206 L018500300050 16.306 3.944 0.243 L018500300051 16.783 3.888 0.206 L018500300052 ENDDATA 37 0 L018500300053 ENDSUBENT 52 0 L018500399999 SUBENT L0185004 20131209 L023L018500400001 BIB 4 6 L018500400002 REACTION (92-U-238(G,F),PR,NU) L018500400003 STATUS (CURVE) Fig. 7, page 161. L018500400004 SAMPLE (92-U-238,ENR=0.998) Three metal cylinders, contaminantL018500400005 235U-0.2%. L018500400006 ERR-ANALYS (DATA-ERR) Dominated by statistical errors. L018500400007 (ERR-1) Detector efficiency error. L018500400008 ENDBIB 6 0 L018500400009 COMMON 1 3 L018500400010 ERR-1 L018500400011 PER-CENT L018500400012 1.2 L018500400013 ENDCOMMON 3 0 L018500400014 DATA 3 32 L018500400015 EN DATA DATA-ERR L018500400016 MEV PRT/FIS PRT/FIS L018500400017 6.000 2.528 0.132 L018500400018 6.262 2.698 0.113 L018500400019 6.859 2.811 0.113 L018500400020 7.002 2.811 0.094 L018500400021 7.360 2.792 0.113 L018500400022 7.718 2.868 0.094 L018500400023 7.813 2.811 0.113 L018500400024 8.433 2.887 0.094 L018500400025 8.577 2.906 0.151 L018500400026 8.934 3.019 0.094 L018500400027 9.412 2.962 0.094 L018500400028 9.913 3.057 0.094 L018500400029 10.390 3.075 0.094 L018500400030 10.509 3.075 0.075 L018500400031 10.771 2.981 0.094 L018500400032 10.891 3.189 0.057 L018500400033 11.034 3.283 0.075 L018500400034 11.272 3.151 0.094 L018500400035 11.511 3.264 0.132 L018500400036 11.869 3.472 0.075 L018500400037 12.131 3.472 0.113 L018500400038 12.370 3.208 0.113 L018500400039 12.728 3.566 0.094 L018500400040 12.990 3.453 0.094 L018500400041 13.085 3.528 0.094 L018500400042 13.252 3.453 0.094 L018500400043 13.825 3.472 0.094 L018500400044 14.350 3.679 0.094 L018500400045 14.827 3.585 0.113 L018500400046 15.304 3.811 0.094 L018500400047 16.044 3.830 0.113 L018500400048 16.783 3.906 0.113 L018500400049 ENDDATA 34 0 L018500400050 ENDSUBENT 49 0 L018500499999 SUBENT L0185005 20131209 L023L018500500001 BIB 4 5 L018500500002 REACTION (90-TH-232(G,F),PR,NU) L018500500003 SAMPLE Three metal Th cylinders. L018500500004 STATUS (CURVE) Fig. 7, page 161. L018500500005 ERR-ANALYS (DATA-ERR) Dominated by statistical errors. L018500500006 (ERR-1) Detector efficiency error. L018500500007 ENDBIB 5 0 L018500500008 COMMON 1 3 L018500500009 ERR-1 L018500500010 PER-CENT L018500500011 1.2 L018500500012 ENDCOMMON 3 0 L018500500013 DATA 3 28 L018500500014 EN DATA DATA-ERR L018500500015 MEV PRT/FIS PRT/FIS L018500500016 5.571 1.519 0.509 L018500500017 5.761 1.880 0.269 L018500500018 5.905 1.704 0.222 L018500500019 6.024 1.981 0.213 L018500500020 6.143 2.009 0.222 L018500500021 6.286 1.972 0.194 L018500500022 6.453 1.759 0.157 L018500500023 6.740 1.898 0.222 L018500500024 7.002 1.917 0.213 L018500500025 7.241 1.676 0.231 L018500500026 7.479 1.843 0.222 L018500500027 7.718 1.722 0.222 L018500500028 7.956 1.657 0.213 L018500500029 8.219 1.667 0.296 L018500500030 8.672 2.019 0.250 L018500500031 8.934 2.111 0.259 L018500500032 9.435 2.500 0.213 L018500500033 9.936 2.574 0.157 L018500500034 10.437 2.602 0.120 L018500500035 10.915 2.444 0.074 L018500500036 11.630 2.444 0.407 L018500500037 12.370 2.685 0.343 L018500500038 13.109 2.593 0.296 L018500500039 13.849 2.954 0.204 L018500500040 14.374 3.093 0.296 L018500500041 14.827 3.509 0.306 L018500500042 15.328 3.204 0.222 L018500500043 17.308 3.778 0.250 L018500500044 ENDDATA 30 0 L018500500045 ENDSUBENT 44 0 L018500599999 SUBENT L0185006 20131209 L023L018500600001 BIB 4 6 L018500600002 REACTION (92-U-235(G,F),DL,NU) L018500600003 STATUS (CURVE) Fig. 9, page 163. L018500600004 SAMPLE (92-U-235,ENR=0.9323) Metal cylinder and U3O8 cylinder,L018500600005 contaminants 234U-1%, 236U-0.36%, and 238U-5.41%. L018500600006 ERR-ANALYS (DATA-ERR) No details are given. L018500600007 (ERR-1) Detector efficiency error. L018500600008 ENDBIB 6 0 L018500600009 COMMON 1 3 L018500600010 ERR-1 L018500600011 PER-CENT L018500600012 1.3 L018500600013 ENDCOMMON 3 0 L018500600014 DATA 3 2 L018500600015 EN DATA DATA-ERR L018500600016 MEV PRT/FIS PRT/FIS L018500600017 10.9 1.085E-02 2.701E-03 L018500600018 16.8 8.061E-03 4.902E-03 L018500600019 ENDDATA 4 0 L018500600020 ENDSUBENT 19 0 L018500699999 SUBENT L0185007 20131209 L023L018500700001 BIB 4 6 L018500700002 REACTION (92-U-236(G,F),DL,NU) L018500700003 STATUS (CURVE) Fig. 9, page 163. L018500700004 SAMPLE (92-U-236,ENR=0.8928) U3O8 cylinder, contaminants L018500700005 234U-0.13%, 235U-9.27%, and 238U-1.31%. L018500700006 ERR-ANALYS (DATA-ERR) No details are given. L018500700007 (ERR-1) Detector efficiency error. L018500700008 ENDBIB 6 0 L018500700009 COMMON 1 3 L018500700010 ERR-1 L018500700011 PER-CENT L018500700012 1.3 L018500700013 ENDCOMMON 3 0 L018500700014 DATA 3 1 L018500700015 EN DATA DATA-ERR L018500700016 MEV PRT/FIS PRT/FIS L018500700017 10.9 2.631E-02 7.255E-03 L018500700018 ENDDATA 3 0 L018500700019 ENDSUBENT 18 0 L018500799999 SUBENT L0185008 20131209 L023L018500800001 BIB 5 9 L018500800002 REACTION (92-U-238(G,F),DL,NU) L018500800003 STATUS (CURVE) Fig. 9, page 163. L018500800004 SAMPLE (92-U-238,ENR=0.998) Three metal cylinders, contaminantL018500800005 235U-0.2%. L018500800006 ERR-ANALYS (DATA-ERR) No details are given. L018500800007 (ERR-1) Detector efficiency error. L018500800008 COMMENT Distinction in figures between 238U and 232Th data is L018500800009 not very clear. It includes 3Z-A = 38 for both L018500800010 targets. L018500800011 ENDBIB 9 0 L018500800012 COMMON 1 3 L018500800013 ERR-1 L018500800014 PER-CENT L018500800015 1.3 L018500800016 ENDCOMMON 3 0 L018500800017 DATA 3 2 L018500800018 EN DATA DATA-ERR L018500800019 MEV PRT/FIS PRT/FIS L018500800020 10.9 4.146E-02 5.807E-03 L018500800021 16.8 3.508E-02 8.316E-03 L018500800022 ENDDATA 4 0 L018500800023 ENDSUBENT 22 0 L018500899999 SUBENT L0185009 20131209 L023L018500900001 BIB 5 8 L018500900002 REACTION (90-TH-232(G,F),DL,NU) L018500900003 STATUS (CURVE) Fig. 9, page 163. L018500900004 SAMPLE Three metal Th cylinders. L018500900005 ERR-ANALYS (DATA-ERR) No details are given. L018500900006 (ERR-1) Detector efficiency error. L018500900007 COMMENT Distinction in figures between 238U and 232Th data is L018500900008 not very clear. It includes 3Z-A = 38 for both L018500900009 targets. L018500900010 ENDBIB 8 0 L018500900011 COMMON 1 3 L018500900012 ERR-1 L018500900013 PER-CENT L018500900014 1.3 L018500900015 ENDCOMMON 3 0 L018500900016 DATA 3 2 L018500900017 EN DATA DATA-ERR L018500900018 MEV PRT/FIS PRT/FIS L018500900019 10.9 3.640E-02 3.598E-03 L018500900020 16.8 2.301E-02 4.128E-03 L018500900021 ENDDATA 4 0 L018500900022 ENDSUBENT 21 0 L018500999999 ENDENTRY 9 0 L018599999999