ENTRY 20488 20200924 22952048800000001 SUBENT 20488001 20200924 22952048800100001 BIB 8 40 2048800100002 TITLE Measurement of the average prompt neutron number nu-p 2048800100003 emitted during fission of 240Pu and 241Pu induced by 2048800100004 neutrons with energy between 1.5 and 15 MeV 2048800100005 AUTHOR (J.Frehaut, G.Mosinski, R.Bois, M.Soleilhac) 2048800100006 INSTITUTE (2FR BRC) 2048800100007 REFERENCE (R,CEA-R-4626,1974) 2048800100008 (S,EANDC(E)-154,67,1973) 2048800100009 Prelim. nu-p(240Pu) and final 240Pu(n,f)/235U(n,f) 2048800100010 in tables 2048800100011 (C,73KIEV,3,153,1973) 2048800100012 Prelim. nu-p(240Pu) and final 240Pu(n,f)/235U(n,f) 2048800100013 in tables 2048800100014 DETECTOR (FISCH) Fission chamber (240Pu/235U+252Cf or 2048800100015 241Pu+252Cf) at the centre of the tank. 2048800100016 (STANK) Gd loaded liquid scintillator tank (80 cm 2048800100017 diam.) for prompt neutron and gamma detection. 2048800100018 METHOD (COINC) Identification of fission by detection of 2048800100019 fission fragment and prompt gamma in coincidence 2048800100020 (TOF) to separate fissions induced by monoenergetic 2048800100021 neutrons from spontaneous fissions and D(d,np)D 2048800100022 neutron-induced fissions 2048800100023 CORRECTION Corrected for 2048800100024 - background mainly due to neutrons scattered by 2048800100025 the fission chamber (most important) 2048800100026 - dead time (120 ns) 2048800100027 - impact of difference in the energy spectra of 2048800100028 fission neutrons on neutron detection efficiency 2048800100029 determination 2048800100030 - impact of relative position of 252Cf and 240/241Pu 2048800100031 on neutron detection efficiency determination. 2048800100032 Not corrected for 2048800100033 - other Pu isotopes 2048800100034 - fission fragment emission anisotropy 2048800100035 - loss of fission events 2048800100036 - French effect 2048800100037 - detection of delayed gamma along with neutrons 2048800100038 HISTORY (19730830C) Compiled from 73KIEV,3,153 2048800100039 (19760210A) Compiled from CEA-R-4626. Data renormalized2048800100040 (19760315E) 2048800100041 (20200924A) On. 001-004 recompiled. 005-006 added. 2048800100042 ENDBIB 40 0 2048800100043 NOCOMMON 0 0 2048800100044 ENDSUBENT 43 0 2048800199999 SUBENT 20488002 20200924 22952048800200001 BIB 11 36 2048800200002 REACTION ((94-PU-240(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2048800200003 FACILITY (VDGT,2FR BRC) 12 MeV tandem VdG, 2 ns pulse at 2.5 MHz2048800200004 INC-SOURCE (P-T) En=1.5 to 7 MeV 2048800200005 (D-D) En=7 to 15 MeV 2048800200006 SAMPLE 235U (50 mg, ~1 mg/cm2) 2048800200007 (94-PU-240,ENR=0.9839) 2048800200008 (94-PU-238,ENR=0.00007) 2048800200009 (94-PU-239,ENR=0.0077) 2048800200010 (94-PU-241,ENR=0.0066) 2048800200011 (94-PU-242,ENR=0.0017) 2048800200012 240Pu (53 mg, 0.15 mg/cm2) deposited on 40 Pt disks 2048800200013 ANALYSIS Below 7 MeV, the ratio was normalized to Davey's 2048800200014 evaluation which is based on experimental results, 2048800200015 in particular those by White and Warner. 2048800200016 MONITOR ((94-PU-240(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2048800200017 MONIT-REF (,W.G.Davey,J,NSE,32,35,1968) 2048800200018 Evaluated 240Pu(n,f)/235U(n,f) ratio in table 2048800200019 CORRECTION Not corrected for 2048800200020 - scattering of incident neutrons by Pt backings of 2048800200021 fissile substances because it does not vary over 2048800200022 the energy range studied. 2048800200023 ERR-ANALYS By compiler (2020-09-24): 2048800200024 The point-wise uncertainty is not declared as the 2048800200025 statistical one, but the compiler followed the 2048800200026 description in the 1976 compilation. 2048800200027 Among various uncertainties in Table 1 of CEA-R-4626, 2048800200028 the compiler assumed the following five uncertainties 2048800200029 are relevant to the cross section ratio determination. 2048800200030 (ERR-S) Only the statistical ones 2048800200031 (ERR-1) Anisotropy in fragment emission (0.2%) 2048800200032 (ERR-2) Fission event loss (0.1%) 2048800200033 (ERR-3) French effect (0.05%) 2048800200034 (ERR-4) Fission induced by scattered neutrons (0.2%) 2048800200035 STATUS (TABLE) Table 3 of Report CEA-R-4626 2048800200036 HISTORY (19760210U) Comments rewritten 2048800200037 (20200924A) On. ERR-ANALYSIS and headings revised. 2048800200038 ENDBIB 36 0 2048800200039 COMMON 4 3 2048800200040 ERR-1 ERR-2 ERR-3 ERR-4 2048800200041 PER-CENT PER-CENT PER-CENT PER-CENT 2048800200042 0.2 0.1 0.05 0.2 2048800200043 ENDCOMMON 3 0 2048800200044 DATA 4 22 2048800200045 EN EN-RSL-HW DATA ERR-S 2048800200046 MEV KEV NO-DIM NO-DIM 2048800200047 1.87 150. 1.145 0.042 2048800200048 2.45 125. 1.295 0.052 2048800200049 2.98 105. 1.364 0.045 2048800200050 3.50 100. 1.321 0.049 2048800200051 4.03 90. 1.377 0.056 2048800200052 4.54 80. 1.419 0.073 2048800200053 5.06 70. 1.375 0.068 2048800200054 5.81 210. 1.427 0.060 2048800200055 6.97 170. 1.252 0.034 2048800200056 7.48 160. 1.289 0.043 2048800200057 7.99 145. 1.197 0.035 2048800200058 8.49 130. 1.197 0.030 2048800200059 9.00 120. 1.213 0.024 2048800200060 9.49 110. 1.182 0.029 2048800200061 9.98 100. 1.156 0.024 2048800200062 10.47 95. 1.183 0.033 2048800200063 10.96 90. 1.196 0.031 2048800200064 11.44 85. 1.200 0.023 2048800200065 11.93 80. 1.174 0.028 2048800200066 12.88 80. 1.085 0.028 2048800200067 13.84 75. 1.031 0.026 2048800200068 14.79 70. 1.223 0.060 2048800200069 ENDDATA 24 0 2048800200070 ENDSUBENT 69 0 2048800299999 SUBENT 20488003 20200924 22952048800300001 BIB 10 28 2048800300002 REACTION (94-PU-240(N,F),PR,NU) 2048800300003 FACILITY (VDGT,2FR BRC) 12 MeV tandem VdG, 2 ns pulse at 2.5 MHz2048800300004 INC-SOURCE (P-T) En=1.5 to 7 MeV 2048800300005 (D-D) En=7 to 15 MeV 2048800300006 SAMPLE (94-PU-240,ENR=0.984) 2048800300007 240Pu (53 mg, 0.15 mg/cm2) deposited on 40 Pt disks 2048800300008 MONITOR (98-CF-252(0,F),PR,NU) 2048800300009 MONIT-REF (,E.J.Axton,C,72VIENNA,,261,1972) 2048800300010 ADD-RES Between 1 and 15 MeV, 2048800300011 nu-bar=(0.150+/-0.004)*E + (2.798+/-0.037) 2048800300012 within the limits of the statistical error. 2048800300013 ERR-ANALYS By compiler (2020-09-24): 2048800300014 The compiler assumed all uncertainties in Table 1 of 2048800300015 CEA-R-4626 except for neutron scattering by Pt are 2048800300016 relevant to the nu-bar determination. 2048800300017 (ERR-S) purely statistical 2048800300018 (ERR-1,0.1,0.3) Background (0.1-0.3%)2048800300019 (ERR-2,0.1,0.2) Dead time (0.1-0.2%)2048800300020 (ERR-3,0.05,0.42)Spectrum difference (0.05-0.42%)2048800300021 (ERR-4) Relative sample position (0.05%)2048800300022 (ERR-5) Impurities (0.05%)2048800300023 (ERR-6) Anisotropy in fragment emission (0.2%)2048800300024 (ERR-7) Fission event loss (0.1%)2048800300025 (ERR-8) French effect (0.05%)2048800300026 (ERR-9) Delyaed gamma-rays (0.1%)2048800300027 STATUS (TABLE) Table 2 of Report CEA-R-4626 2048800300028 HISTORY (19760210A) Comments rewritten and new data inserted. 2048800300029 (20200924A) On. ERR-ANALYSIS and headings revised. 2048800300030 ENDBIB 28 0 2048800300031 COMMON 7 6 2048800300032 ERR-4 ERR-5 ERR-6 ERR-7 ERR-8 ERR-9 2048800300033 MONIT 2048800300034 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2048800300035 PRT/FIS 2048800300036 0.05 0.05 0.2 0.1 0.05 0.1 2048800300037 3.732 2048800300038 ENDCOMMON 6 0 2048800300039 DATA 4 22 2048800300040 EN EN-RSL-HW DATA ERR-S 2048800300041 MEV KEV PRT/FIS PRT/FIS 2048800300042 1.87 150. 3.074 0.055 2048800300043 2.45 125. 3.162 0.051 2048800300044 2.98 105. 3.281 0.045 2048800300045 3.50 100. 3.281 0.051 2048800300046 4.03 90. 3.355 0.055 2048800300047 4.54 80. 3.528 0.075 2048800300048 5.06 70. 3.546 0.071 2048800300049 5.81 210. 3.661 0.059 2048800300050 6.97 170. 3.854 0.041 2048800300051 7.48 160. 3.914 0.051 2048800300052 7.99 145. 4.029 0.045 2048800300053 8.49 130. 4.058 0.041 2048800300054 9.00 120. 4.153 0.035 2048800300055 9.49 110. 4.213 0.042 2048800300056 9.98 100. 4.298 0.040 2048800300057 10.47 95. 4.396 0.053 2048800300058 10.96 90. 4.412 0.054 2048800300059 11.44 85. 4.510 0.040 2048800300060 11.93 80. 4.594 0.067 2048800300061 12.88 80. 4.751 0.068 2048800300062 13.84 75. 4.848 0.065 2048800300063 14.79 70. 5.086 0.122 2048800300064 ENDDATA 24 0 2048800300065 ENDSUBENT 64 0 2048800399999 SUBENT 20488004 20200924 22952048800400001 BIB 10 28 2048800400002 REACTION (94-PU-241(N,F),PR,NU) 2048800400003 FACILITY (VDGT,2FR BRC) 12 MeV tandem VdG, 2 ns pulse at 2.5 MHz2048800400004 INC-SOURCE (P-T) En=1.5 to 7 MeV 2048800400005 (D-D) En=7 to 15 MeV 2048800400006 SAMPLE (94-PU-241,ENR=0.97) 2048800400007 241Pu (100 mg, 1 mg/cm2) distributed on 16 Al disks 2048800400008 MONITOR (98-CF-252(0,F),PR,NU) 2048800400009 MONIT-REF (,E.J.Axton,C,72VIENNA,,261,1972) 2048800400010 ADD-RES Between 1 and 15 MeV, 2048800400011 nu-bar=(0.153+/-0.002)*E + (2.845+/-0.023) 2048800400012 within the limits of the statistical error. 2048800400013 ERR-ANALYS By compiler (2020-09-24): 2048800400014 The compiler assumed all uncertainties in Table 1 of 2048800400015 CEA-R-4626 except for neutron scattering by Pt are 2048800400016 relevant to the nu-bar determination. 2048800400017 (ERR-S) purely statistical 2048800400018 (ERR-1,0.1,0.3) Background (0.1-0.3%)2048800400019 (ERR-2,0.1,0.2) Dead time (0.1-0.2%)2048800400020 (ERR-3,0.05,0.42)Spectrum difference (0.05-0.42%)2048800400021 (ERR-5) Impurities (0.05%)2048800400022 (ERR-6) Anisotropy in fragment emission (0.2%)2048800400023 (ERR-7) Fission event loss (0.1%)2048800400024 (ERR-8) French effect (0.05%)2048800400025 (ERR-9) Delyaed gamma-rays (0.1%)2048800400026 STATUS (TABLE) Table 2 of Report CEA-R-4626 2048800400027 HISTORY (19750107C) Compiled from NEANDC-E-161,39. 2048800400028 (19760210A) Comments rewritten and new data inserted. 2048800400029 (20200924A) On. ERR-ANALYSIS and headings revised. 2048800400030 ENDBIB 28 0 2048800400031 COMMON 6 3 2048800400032 ERR-5 ERR-6 ERR-7 ERR-8 ERR-9 MONIT 2048800400033 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PRT/FIS 2048800400034 0.05 0.2 0.1 0.05 0.1 3.732 2048800400035 ENDCOMMON 3 0 2048800400036 DATA 4 23 2048800400037 EN EN-RSL-HW DATA ERR-S 2048800400038 MEV KEV PRT/FIS PRT/FIS 2048800400039 1.87 150. 3.160 0.053 2048800400040 2.45 125. 3.209 0.034 2048800400041 2.98 105. 3.322 0.028 2048800400042 3.50 100. 3.332 0.033 2048800400043 4.03 90. 3.474 0.042 2048800400044 5.06 70. 3.631 0.073 2048800400045 6.97 170. 3.951 0.067 2048800400046 7.48 160. 3.967 0.038 2048800400047 7.99 145. 4.055 0.030 2048800400048 8.49 130. 4.127 0.028 2048800400049 9.00 120. 4.249 0.038 2048800400050 9.49 110. 4.252 0.034 2048800400051 9.98 100. 4.372 0.030 2048800400052 10.47 95. 4.449 0.030 2048800400053 10.96 90. 4.528 0.031 2048800400054 11.44 85. 4.605 0.041 2048800400055 11.93 80. 4.658 0.033 2048800400056 12.41 80. 4.744 0.032 2048800400057 12.88 80. 4.827 0.040 2048800400058 13.36 75. 4.873 0.034 2048800400059 13.84 75. 4.999 0.043 2048800400060 14.31 70. 5.089 0.051 2048800400061 14.79 70. 5.112 0.058 2048800400062 ENDDATA 25 0 2048800400063 ENDSUBENT 62 0 2048800499999 SUBENT 20488005 20200924 22952048800500001 BIB 6 20 2048800500002 REACTION (94-PU-240(0,F),PR,NU) 2048800500003 SAMPLE (94-PU-240,ENR=0.984) 2048800500004 240Pu (53 mg, 0.15 mg/cm2) deposited on 40 Pt disks 2048800500005 MONITOR (98-CF-252(0,F),PR,NU) 2048800500006 ERR-ANALYS By compiler (2020-09-24): 2048800500007 The compiler assumed all uncertainties in Table 1 of 2048800500008 CEA-R-4626 except for neutron scattering by Pt are 2048800500009 relevant to the nu-bar determination. 2048800500010 (ERR-T) including systematic error due to correcitons: 2048800500011 (ERR-1,0.1,0.3) Background (0.1-0.3%)2048800500012 (ERR-2,0.1,0.2) Dead time (0.1-0.2%)2048800500013 (ERR-3,0.05,0.42)Spectrum difference (0.05-0.42%)2048800500014 (ERR-4) Relative sample position (0.05%)2048800500015 (ERR-5) Impurities (0.05%)2048800500016 (ERR-6) Anisotropy in fragment emission (0.2%)2048800500017 (ERR-7) Fission event loss (0.1%)2048800500018 (ERR-8) French effect (0.05%)2048800500019 (ERR-9) Delyaed gamma-rays (0.1%)2048800500020 STATUS (TABLE) Table 4 of Report CEA-R-4626 2048800500021 HISTORY (20200924C) On 2048800500022 ENDBIB 20 0 2048800500023 COMMON 6 3 2048800500024 ERR-4 ERR-5 ERR-6 ERR-7 ERR-8 ERR-9 2048800500025 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2048800500026 0.05 0.05 0.2 0.1 0.05 0.1 2048800500027 ENDCOMMON 3 0 2048800500028 DATA 3 1 2048800500029 DATA ERR-T MONIT 2048800500030 PRT/FIS PRT/FIS PRT/FIS 2048800500031 2.178 0.015 3.784 2048800500032 ENDDATA 3 0 2048800500033 ENDSUBENT 32 0 2048800599999 SUBENT 20488006 20200924 22952048800600001 BIB 5 6 2048800600002 REACTION (94-PU-240(0,F),NUM,NU) 2048800600003 ADD-RES =6.086 +/- 0.050 2048800600004 std.dev=1.159 +/- 0.010 2048800600005 ERR-ANALYS (DATA-ERR) No information on the source of uncertainty 2048800600006 STATUS (TABLE) Table 4 of Report CEA-R-4626 2048800600007 HISTORY (20200924C) On 2048800600008 ENDBIB 6 0 2048800600009 NOCOMMON 0 0 2048800600010 DATA 3 8 2048800600011 PART-OUT DATA DATA-ERR 2048800600012 NO-DIM NO-DIM NO-DIM 2048800600013 0. 0.0658 0.0030 2048800600014 1. 0.2235 0.0045 2048800600015 2. 0.3266 0.0050 2048800600016 3. 0.2576 0.0060 2048800600017 4. 0.1047 0.0045 2048800600018 5. 0.0192 0.0020 2048800600019 6. 0.0021 0.0004 2048800600020 7. 0.00015 0.00010 2048800600021 ENDDATA 10 0 2048800600022 ENDSUBENT 21 0 2048800699999 ENDENTRY 6 0 2048899999999