ENTRY 21698 20230209 2169800000001 SUBENT 21698001 20230209 20231011 2169800100001 BIB 13 43 2169800100002 TITLE Measurement of the U-238 capture cross section shape 2169800100003 in the neutron energy region 20 to 550 keV 2169800100004 AUTHOR (R.R.Spencer,F.Kaeppeler) 2169800100005 REFERENCE (C,75WASH,2,620,1975) 2169800100006 ((P,NEANDC(E)-163,191,1975)=(P,INDC(FR)-5,191,1975)) 2169800100007 Proceedings of Saclay meeting preliminary data 2169800100008 relative to U-235. 2169800100009 (P,KFK-1274,(2),121,1974) graph. 2169800100010 (P,NEANDC(E)-162,(5),2,1975) Curve. 2169800100011 (P,ORNL-5101,7,1975) Superseded. 2169800100012 INSTITUTE (2GERKFK) F.Kaeppeler 2169800100013 (1USAORL) R.R.Spencer 2169800100014 FACILITY (VDG,2GERKFK) 3 MV pulsed Van der Graaff. 2169800100015 INC-SOURCE (P-LI7) Thick lithium target, producing a white neutron2169800100016 spectrum for energies below 300 keV. A thin lithium 2169800100017 target giving monochromatic neutrons was used for 2169800100018 higher energies. 2169800100019 SAMPLE A 1 mm thick sample of U238, 99.76% purity. 2169800100020 Correction is made for the 0.24% U-235 content. 2169800100021 METHOD (TOF) 2169800100022 Flight paths for all samples were 203.3.cm. 2169800100023 DETECTOR (SCIN ) 800 liter liquid scintillator, with a 2169800100024 coincidence requirement between quarters. 2169800100025 (FISCH) Gas scintillation fission chamber, operated 2169800100026 with a flowing mixture of 85% Ar - 15% 2169800100027 nitrogen was used for the U-235 monitor. 2169800100028 CORRECTION Data is corrected for multiple scattering, resonance 2169800100029 self shielding in the sample, air scattering and for 2169800100030 the 0.25% U-235 impurity. 2169800100031 ERR-ANALYS (ERR-1) Uncertainty in resonance self-protection and 2169800100032 multiple scattering 2169800100033 (ERR-4) variation with neutron energy of spectrum 2169800100034 fractions 2169800100035 (ERR-5) Uncertainty in counting loss correction 2169800100036 (ERR-S) Statistical uncertainty 2169800100037 STATUS (TABLE) Tables in 75WASH,2,620,1975 2169800100038 HISTORY (19801211C) 2169800100039 (20101114A) SD:Updated to new date formats,lower case. 2169800100040 In Subents 003, 005 MONIT2 added, ERR-ANALYS corrected 2169800100041 in all Subents. 2169800100042 (20180829U) SD: ERR-ANALYS was updated in Subent 004. 2169800100043 (20200804U) SD: Refs without additional info deleted. 2169800100044 (20230209U) SD: ERR-ANALYS updated. 2169800100045 ENDBIB 43 0 2169800100046 NOCOMMON 0 0 2169800100047 ENDSUBENT 46 0 2169800199999 SUBENT 21698002 20230209 20231011 2169800200001 BIB 4 10 2169800200002 REACTION ((92-U-238(N,G)92-U-239,,SIG,,AV)/ 2169800200003 (79-AU-197(N,G)79-AU-198,,SIG,,AV)) 2169800200004 ERR-ANALYS (ERR-2,,3.) background correction gives an uncertainty 2169800200005 varying from 3% in the ranges 20-30 and 200-300 keV 2169800200006 to negligible values at high energies. 2169800200007 (ERR-3,1.,2.) Uncertainty in flux averaging by sample 2169800200008 cycling varies from less than 1% at low energies 2169800200009 to 2% above 200 keV. 2169800200010 STATUS (TABLE) Table I, columns 2 and 3 of 75WASH,2,620,1975 2169800200011 HISTORY (20230209U) SD: ERR-ANALYS updated. 2169800200012 ENDBIB 10 0 2169800200013 COMMON 3 3 2169800200014 ERR-1 ERR-4 ERR-5 2169800200015 PER-CENT PER-CENT PER-CENT 2169800200016 0.3 1.5 0.5 2169800200017 ENDCOMMON 3 0 2169800200018 DATA 4 22 2169800200019 EN-MIN EN-MAX DATA ERR-S 2169800200020 KEV KEV NO-DIM PER-CENT 2169800200021 20. 30. 0.8542 0.4 2169800200022 30. 40. 0.8704 0.3 2169800200023 40. 50. 0.8856 0.3 2169800200024 50. 60. 0.7823 0.4 2169800200025 60. 70. 0.7263 0.4 2169800200026 70. 80. 0.6635 0.4 2169800200027 80. 90. 0.6543 0.4 2169800200028 90. 100. 0.6430 0.5 2169800200029 100. 120. 0.6202 0.3 2169800200030 120. 140. 0.6015 0.4 2169800200031 140. 160. 0.5728 0.4 2169800200032 160. 180. 0.5694 0.5 2169800200033 180. 200. 0.5510 0.5 2169800200034 180. 223. 0.5689 1.0 2169800200035 223. 264. 0.5607 1.0 2169800200036 264. 309. 0.6104 1.0 2169800200037 317. 373. 0.6816 0.5 2169800200038 387. 431. 0.7872 0.5 2169800200039 423. 467. 0.7851 0.5 2169800200040 438. 483. 0.9092 0.5 2169800200041 483. 529. 1.0115 0.5 2169800200042 508. 564. 1.0735 0.5 2169800200043 ENDDATA 24 0 2169800200044 ENDSUBENT 43 0 2169800299999 SUBENT 21698003 20230209 20231011 2169800300001 BIB 7 24 2169800300002 REACTION (92-U-238(N,G)92-U-239,,SIG,,AV) 2169800300003 ANALYSIS Derived from ratio data, Subent 002. 2169800300004 MONITOR ((MONIT1)92-U-238(N,G)92-U-239,,SIG,,,EVAL) 2169800300005 ((MONIT2)79-AU-197(N,G)79-AU-198,,SIG,,AV) Average 2169800300006 values given in table I of 75WASH,2,620,1975 2169800300007 MONIT-REF ((MONIT1),M.G.Sowerby+,R,AERE-R-7273,1973) 2169800300008 ((MONIT2),D.Kompe,J,NP/A,133,513,1969) below 200 keV 2169800300009 ((MONIT2),C.Le Rigoleur+,R,CEA-N-1662,1973) above 2169800300010 200 keV 2169800300011 ERR-ANALYS (MONIT2-ERR,0.,5.) uncertainty in the shape of the gold2169800300012 cross section varies from 0 at the 20 keV 2169800300013 normalisation point to 3% at 20 keV and 5% at 500 keV 2169800300014 (ERR-2,,3.) background correction gives an uncertainty 2169800300015 varying from 3% in the ranges 20-30 and 200-300 keV 2169800300016 to negligible values at high energies. 2169800300017 (ERR-3,1.,2.) Uncertainty in flux averaging by sample 2169800300018 cycling varies from less than 1% at low energies 2169800300019 to 2% above 200 keV. 2169800300020 (ERR-6) Uncertainty of the tank efficiency for 238U 2169800300021 capture detection that assumed for the 2169800300022 normalization value 2169800300023 STATUS (TABLE) Table I, columns 3,4 and 5 from 75WASH,2,620 2169800300024 (DEP,21698002) 2169800300025 HISTORY (20230209U) SD: ERR-ANALYS updated. 2169800300026 ENDBIB 24 0 2169800300027 COMMON 4 3 2169800300028 ERR-1 ERR-4 ERR-5 ERR-6 2169800300029 PER-CENT PER-CENT PER-CENT PER-CENT 2169800300030 0.3 1.5 0.5 10. 2169800300031 ENDCOMMON 3 0 2169800300032 DATA 6 22 2169800300033 EN-MIN EN-MAX MONIT2 DATA ERR-S MONIT1 2169800300034 KEV KEV MB MB PER-CENT MB 2169800300035 20. 30. 667. 570. 0.4 2169800300036 30. 40. 546. 475. 0.3 2169800300037 40. 50. 467. 413.5 0.3 2169800300038 50. 60. 409. 320. 0.4 2169800300039 60. 70. 377. 274. 0.4 2169800300040 70. 80. 357. 237. 0.4 2169800300041 80. 90. 328. 215. 0.4 2169800300042 90. 100. 311. 200. 0.5 200.2169800300043 100. 120. 295. 183. 0.3 2169800300044 120. 140. 277. 167. 0.4 2169800300045 140. 160. 269. 154. 0.4 2169800300046 160. 180. 258. 147. 0.5 2169800300047 180. 200. 254. 140. 0.5 2169800300048 180. 223. 251. 143. 1.0 2169800300049 223. 264. 232. 130. 1.0 2169800300050 264. 309. 216. 132. 1.0 2169800300051 317. 373. 174. 119. 0.5 2169800300052 387. 431. 158. 124. 0.5 2169800300053 423. 467. 146. 115. 0.5 2169800300054 438. 483. 142. 129. 0.5 2169800300055 483. 529. 134.5 136. 0.5 2169800300056 508. 564. 125. 134. 0.5 2169800300057 ENDDATA 24 0 2169800300058 ENDSUBENT 57 0 2169800399999 SUBENT 21698004 20230209 20231011 2169800400001 BIB 4 10 2169800400002 REACTION ((92-U-238(N,G)92-U-239,,SIG,,AV)/ 2169800400003 (92-U-235(N,F),,SIG,,AV)) 2169800400004 ERR-ANALYS (ERR-2,,3.) background correction gives an uncertainty 2169800400005 varying from 3% in the ranges 20-30 and 200-300 keV 2169800400006 to negligible values at high energies. 2169800400007 (ERR-3,,0.5) Uncertainty in air correction 2169800400008 STATUS (TABLE) Table II from 75WASH,2,620,1975 2169800400009 HISTORY (20180829U) SD: ERR-ANALYS was updated. 2169800400010 (20230209U) SD: ERR-ANALYS was updated according to 2169800400011 presentation in the article. 2169800400012 ENDBIB 10 0 2169800400013 COMMON 3 3 2169800400014 ERR-1 ERR-4 ERR-5 2169800400015 PER-CENT PER-CENT PER-CENT 2169800400016 1. 1. 1. 2169800400017 ENDCOMMON 3 0 2169800400018 DATA 4 20 2169800400019 EN-MIN EN-MAX DATA ERR-S 2169800400020 KEV KEV NO-DIM PER-CENT 2169800400021 20. 30. 0.2476 4.0 2169800400022 30. 40. 0.2342 4.0 2169800400023 40. 50. 0.2159 4.0 2169800400024 50. 60. 0.1694 4.0 2169800400025 60. 70. 0.1581 4.0 2169800400026 70. 80. 0.1421 4.0 2169800400027 80. 90. 0.1279 4.0 2169800400028 90. 100. 0.1225 4.0 2169800400029 100. 120. 0.1200 4.0 2169800400030 120. 140. 0.1165 4.0 2169800400031 140. 180. 0.1123 5.0 2169800400032 180. 223. 0.1106 5.0 2169800400033 223. 264. 0.1102 5.0 2169800400034 264. 309. 0.0969 4.0 2169800400035 317. 373. 0.0948 4.0 2169800400036 387. 431. 0.0932 4.0 2169800400037 423. 467. 0.0964 4.0 2169800400038 438. 483. 0.1013 3.0 2169800400039 483. 529. 0.1085 4.0 2169800400040 508. 564. 0.1083 2.0 2169800400041 ENDDATA 22 0 2169800400042 ENDSUBENT 41 0 2169800499999 SUBENT 21698005 20230209 20231011 2169800500001 BIB 7 18 2169800500002 REACTION (92-U-238(N,G)92-U-239,,SIG,,AV) 2169800500003 ANALYSIS Derived from ratio measurement in Subent 004. 2169800500004 MONITOR ((MONIT1)92-U-238(N,G)92-U-239,,SIG,,,EVAL) 2169800500005 ((MONIT2)92-U-235(N,F),,SIG,,AV) Value given in table. 2169800500006 MONIT-REF (,M.G.Sowerby+,R,AERE-R-7273,1973) for both monitors 2169800500007 ERR-ANALYS (MONIT2-ERR,4.5,6.5) Uncertainty in ref. cross-section 2169800500008 (ERR-2,,3.) background correction gives an uncertainty 2169800500009 varying from 3% in the ranges 20-30 and 200-300 keV 2169800500010 to negligible values at high energies. 2169800500011 (ERR-3,,0.5) Uncertainty in air correction 2169800500012 (ERR-6) Uncertainty of the tank efficiency for 238U 2169800500013 capture detection that assumed for the 2169800500014 normalisation value 2169800500015 (ERR-T) Total error 2169800500016 STATUS (TABLE) Table II from 75WASH,2,620 2169800500017 (DEP,21698004) 2169800500018 HISTORY (20230209U) SD: ERR-ANALYS was updated according to 2169800500019 presentation in the article. 2169800500020 ENDBIB 18 0 2169800500021 COMMON 4 3 2169800500022 ERR-1 ERR-4 ERR-5 ERR-6 2169800500023 PER-CENT PER-CENT PER-CENT PER-CENT 2169800500024 1. 1. 1. 10. 2169800500025 ENDCOMMON 3 0 2169800500026 DATA 7 20 2169800500027 EN-MIN EN-MAX MONIT2 DATA ERR-S ERR-T 2169800500028 MONIT1 2169800500029 KEV KEV MB MB PER-CENT PER-CENT 2169800500030 MB 2169800500031 20. 30. 2148.3 532. 4. 12.2169800500032 2169800500033 30. 40. 2010.7 471. 4. 12.2169800500034 2169800500035 40. 50. 1908.4 412. 4. 12.2169800500036 2169800500037 50. 60. 1871.4 317. 4. 12.2169800500038 2169800500039 60. 70. 1808.8 286. 4. 12.2169800500040 2169800500041 70. 80. 1714.1 243.5 4. 12.2169800500042 2169800500043 80. 90. 1681. 215. 4. 12.2169800500044 2169800500045 90. 100. 1632.2 200. 4. 10.2169800500046 200. 2169800500047 100. 120. 1542. 185. 4. 12.2169800500048 2169800500049 120. 140. 1493. 174. 4. 12.2169800500050 2169800500051 140. 180. 1424. 160. 5. 13.2169800500052 2169800500053 180. 223. 1343. 148. 5. 13.2169800500054 2169800500055 223. 264. 1295. 143. 5. 13.2169800500056 2169800500057 264. 309. 1262. 122. 4. 12.2169800500058 2169800500059 317. 373. 1223. 116. 4. 12.2169800500060 2169800500061 387. 431. 1180. 110. 4. 12.2169800500062 2169800500063 423. 467. 1162. 112. 4. 12.2169800500064 2169800500065 438. 483. 1155. 117. 3. 12.2169800500066 2169800500067 483. 529. 1134. 123. 4. 12.2169800500068 2169800500069 508. 564. 1126. 122. 2. 12.2169800500070 2169800500071 ENDDATA 44 0 2169800500072 ENDSUBENT 71 0 2169800599999 ENDENTRY 5 0 2169899999999