ENTRY 10793 20140625 14021079300000001 SUBENT 10793001 20140625 14021079300100001 BIB 7 13 1079300100002 TITLE Neutron Cross Sections of Thorium-232 1079300100003 AUTHOR (R.E.Chrien,H.I.Liou,M.J.Kenny,M.L.Stelts) 1079300100004 REFERENCE (J,NSE,72,202,197911) 1079300100005 (J,BAP,23,637(KL13),197804) 1079300100006 INSTITUTE (1USABNL) 1079300100007 FACILITY (REAC,1USABNL) High Flux Beam Reactor (HFBR). 1079300100008 STATUS (APRVD) Approved by R.E.Chrien, 1979/6/20. 1079300100009 (TABLE) Data taken from tables in main reference. 1079300100010 HISTORY (19790321C) 1079300100011 (19800117) Reference updated. 1079300100012 (20101022A) VM:updated to new date formats,lower case. 1079300100013 BIB updates. 1079300100014 (20140625A) BP: Updated the information. 1079300100015 ENDBIB 13 0 1079300100016 NOCOMMON 0 0 1079300100017 ENDSUBENT 16 0 1079300199999 SUBENT 10793002 20101022 13681079300200001 BIB 12 40 1079300200002 REACTION (90-TH-232(N,G)90-TH-233,,SIG,,MXW) 1079300200003 INC-SOURCE Tailored beam facility with filter of Bi. 1079300200004 INC-SPECT Thermal beam from reactor altered significantly by 1079300200005 Bi-filter. Neutron peaks at 0.01-eV and 0.025-eV with 1079300200006 sharp drop in tail beyond 0.1-eV. 1079300200007 SAMPLE Two samples with thickness 7.56 and 8.086 atoms/B. 1079300200008 DETECTOR (GELI) Germanium lithium detector with 4-percent rela- 1079300200009 tive efficiency. Efficiency measured with Hf-180-m 1079300200010 decay gamma. 1079300200011 (FISCH) 235U fission chamber to monitor beam. 1079300200012 DECAY-DATA (90-TH-233,22.2MIN,B) 1079300200013 (91-PA-233,27.0D,DG,311.,0.385) 1079300200014 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 1079300200015 DECAY-MON (79-AU-198-G,2.696D,DG,411.,0.955) 1079300200016 METHOD (ACTIV) Simultaneous irradiation of thorium sample and 1079300200017 gold monitor. Target located 10.00-cm from detector. 1079300200018 Boron-10 used to determine absolute neutron flux for 1079300200019 monitor cross section measurement. 1079300200020 CORRECTION Corrected for- 1079300200021 .decay prior and during each time period, 1079300200022 .dead time losses, 1079300200023 .non 1/V behavior of gold, 1079300200024 .neutron attenuation in sample (approx 0.1%), 1079300200025 .fast neutrons in thermal beam, 1079300200026 .thermal neutrons in keV beam. 1079300200027 corrections to counting rates assumes time independent 1079300200028 flux over irradiation period. 1079300200029 ERR-ANALYS (DATA-ERR) Quoted errors due to: 1079300200030 .counting statistics, 1079300200031 .detector efficiency corrections, 1079300200032 .peak fitting, 1079300200033 .sample thickness, 1079300200034 .neutron and gamma absorption, 1079300200035 .dead time. 1079300200036 Does not include: 1079300200037 .systematic errors in decay constants, 1079300200038 .errors in branching ratios, 1079300200039 .errors in standard gold and boron cross sections. 1079300200040 HISTORY (19810529A) DECAY-MON correction. 1079300200041 Updates to subentries 004-005, 007-008. 1079300200042 ENDBIB 40 0 1079300200043 NOCOMMON 0 0 1079300200044 DATA 4 1 1079300200045 EN-DUMMY DATA DATA-ERR MONIT 1079300200046 EV B B B 1079300200047 0.0253 7.41 0.08 98.8 1079300200048 ENDDATA 3 0 1079300200049 ENDSUBENT 48 0 1079300299999 SUBENT 10793003 20101022 13681079300300001 BIB 11 38 1079300300002 REACTION (90-TH-232(N,G)90-TH-233,,SIG) 1079300300003 INC-SOURCE Tailored beam facility with filters of Sc(2-keV) or 1079300300004 Fe-56(24.3-keV). 1079300300005 SAMPLE Sample thickness - 2 keV=8.720 atoms/B. 1079300300006 - 24 keV=8.386 atoms/B. 1079300300007 DETECTOR (GELI) 10B-Ge(Li) detector with 4% relative efficiency.1079300300008 Efficiency measured with 180(m)Hf decay gamma. 1079300300009 (FISCH) 235U fission chamber to monitor beam. 1079300300010 DECAY-DATA (90-TH-233,22.2MIN,B) 1079300300011 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) Calculated by averaging 1079300300012 results of BNL-325, Vol.I (1973) over neutron 1079300300013 spectrum. 1079300300014 DECAY-MON (79-AU-198-G,2.696D,DG,411.,0.955) 1079300300015 METHOD (ACTIV) Simultaneous irradiation of thorium sample and 1079300300016 gold monitor. Target located 10.00-cm from detector. 1079300300017 Boron-10 used to determine absolute neutron flux for 1079300300018 monitor cross section measurement. 1079300300019 CORRECTION Corrected for: 1079300300020 .decay prior and during each time period, 1079300300021 .dead time losses, 1079300300022 .non 1/V behavior of gold, 1079300300023 .neutron attenuation in sample (approx 0.1%), 1079300300024 .fast neutrons in thermal beam, 1079300300025 .thermal neutrons in keV beam. 1079300300026 corrections to counting rates assumes time independent 1079300300027 flux over irradiation period. 1079300300028 ERR-ANALYS (DATA-ERR) Quoted errors due to: 1079300300029 .counting statistics, 1079300300030 .detector efficiency corrections, 1079300300031 .peak fitting, 1079300300032 .sample thickness, 1079300300033 .neutron and gamma absorption, 1079300300034 .dead time. 1079300300035 Does not include: 1079300300036 .systematic errors in decay constants, 1079300300037 .errors in branching ratios, 1079300300038 .errors in standard gold and boron cross sections. 1079300300039 HISTORY (19810529A) DECAY-MON correction. 1079300300040 ENDBIB 38 0 1079300300041 NOCOMMON 0 0 1079300300042 DATA 4 2 1079300300043 EN DATA DATA-ERR MONIT 1079300300044 KEV B B B 1079300300045 2. 1.96 0.10 4.31 1079300300046 24. 0.540 0.014 0.620 1079300300047 ENDDATA 4 0 1079300300048 ENDSUBENT 47 0 1079300399999 SUBENT 10793004 20101022 13681079300400001 BIB 8 22 1079300400002 REACTION (90-TH-232(N,TOT),,SIG) 1079300400003 Inter-resonance cross section. 1079300400004 FACILITY (CHOPF,1USABNL) Fast chopper 1079300400005 SAMPLE 5.69-Cm x 5.69-cm with thickness (in b/atom) of 1079300400006 8.77, 20.7, 53.2, 218, 888, 2700. 1079300400007 DETECTOR (GELI) Germanium-lithium diode detector with boron-10 1079300400008 slab. Relative efficiency is 10%. 1079300400009 (FISCH) 235U fission chamber to monitor beam. 1079300400010 METHOD (TOF) Time of flight with flight path of 21.7-meters. 1079300400011 Dead time correction determined by injecting pulser of1079300400012 know rate uncorrelated with chopper. Beam dependent 1079300400013 background deduced from blacked-out resonances from 1079300400014 two thickest samples. Samples were rapidly cycled in 1079300400015 and out of beam. 1079300400016 CORRECTION Dead time correction exceeds 10% for high-energy 1079300400017 thin-sample measurements. Corrected for background. 1079300400018 Beam dependent background approx 1.3% with no sample. 1079300400019 ERR-ANALYS (ERR-SYS) Data error given is estimated systematic 1079300400020 uncertainty. 1079300400021 Normalization uncertainty approx 2%. 1079300400022 Statistical uncertainties are negligible. 1079300400023 HISTORY (20101022A) Updated error heading 1079300400024 ENDBIB 22 0 1079300400025 COMMON 1 3 1079300400026 ERR-SYS 1079300400027 PER-CENT 1079300400028 2.5 1079300400029 ENDCOMMON 3 0 1079300400030 DATA 2 14 1079300400031 EN DATA 1079300400032 EV B 1079300400033 7.38 11.59 1079300400034 8.68 11.42 1079300400035 10.15 11.29 1079300400036 12.02 11.07 1079300400037 14.47 10.91 1079300400038 16.83 10.61 1079300400039 19.81 9.95 1079300400040 27.82 12.94 1079300400041 33.15 11.78 1079300400042 38.61 11.29 1079300400043 49.73 10.41 1079300400044 63.12 8.72 1079300400045 82.74 13.68 1079300400046 95.58 12.05 1079300400047 ENDDATA 16 0 1079300400048 ENDSUBENT 47 0 1079300499999 SUBENT 10793005 20101022 13681079300500001 BIB 9 21 1079300500002 REACTION 1(90-TH-232(N,0),,EN) 1079300500003 2(90-TH-232(N,0),,J) 1079300500004 3(90-TH-232(N,EL),,WID) 1079300500005 4(90-TH-232(N,G),,WID) 1079300500006 FACILITY (CHOPF) Fast chopper 1079300500007 SAMPLE Metallic Th-232 with inverse density of 218-barns/atom 1079300500008 and thin foil with inverse density of 880-barns/atom. 1079300500009 METHOD (TOF) Time of flight with 21.7-meter flight path. Thick1079300500010 thorium slab placed at detector position while thin 1079300500011 foil was rotated in and out of the beam. Normalized to1079300500012 open beam based on run time. Dead time correction 1079300500013 determined by injecting pulser of known rate uncorrel-1079300500014 ated with chopper. 1079300500015 DETECTOR (GELI) Germanium-lithium diode detector with boron-10 1079300500016 slab. Relative efficiency is 10-percent. 1079300500017 (FISCH) U-235 fission chamber to monitor beam. 1079300500018 ANALYSIS (AREA) Area analysis of self indication measurements. 1079300500019 CORRECTION Corrected for dead time and background. 1079300500020 ERR-ANALYS (ERR-S) Quoted uncertainties are statistical only. 1079300500021 HISTORY (20101022A) Added Spin J as data field. Updated error 1079300500022 heading. 1079300500023 ENDBIB 21 0 1079300500024 NOCOMMON 0 0 1079300500025 DATA 6 4 1079300500026 DATA 1DATA 2DATA 3ERR-S 3DATA 4ERR-S 41079300500027 EV NO-DIM MILLI-EV MILLI-EV MILLI-EV MILLI-EV 1079300500028 21.78 0.5 2.11 0.02 24.0 0.2 1079300500029 23.43 0.5 3.68 0.02 26.1 0.2 1079300500030 59.49 0.5 3.96 0.03 25.1 0.3 1079300500031 69.07 0.5 41.4 0.3 22.7 0.4 1079300500032 ENDDATA 6 0 1079300500033 ENDSUBENT 32 0 1079300599999 SUBENT 10793006 20101022 13681079300600001 BIB 8 20 1079300600002 REACTION 1(90-TH-232(N,0),,EN) 1079300600003 2(90-TH-232(N,EL),,WID) 1079300600004 3(90-TH-232(N,G),,WID) 1079300600005 FACILITY (CHOPF) Fast chopper 1079300600006 SAMPLE 5.69-Cm by 5.69-cm with thickness (in centimeters) of 1079300600007 3.81, 1.59, 0.635, 0.152, 0.0381, 0.0127 . 1079300600008 METHOD (TOF) Time of flight with flight path of 21.7 meters. 1079300600009 Dead time correction determined by injecting pulser of1079300600010 know rate uncorrelated with chopper. Beam dependent 1079300600011 background deduced from blacked-out resonances from 1079300600012 two thickest samples. Samples were rapidly cycled in 1079300600013 and out of beam. 1079300600014 DETECTOR (GELI) Germanium-lithium diode detector with boron-10 1079300600015 slab. Relative efficiency is 10%. 1079300600016 (FISCH) 235U fission chamber to monitor beam. 1079300600017 ANALYSIS (SHAPE,MLA) Multilevel shape fit to transmission data 1079300600018 using reduced r-function formalism. 1079300600019 CORRECTION Dead time correction exceeds 10% for high-energy 1079300600020 thin-sample measurements. Corrected for background. 1079300600021 ERR-ANALYS No information on uncertainties. 1079300600022 ENDBIB 20 0 1079300600023 NOCOMMON 0 0 1079300600024 DATA 3 4 1079300600025 DATA 1DATA 2DATA 3 1079300600026 EV MILLI-EV MILLI-EV 1079300600027 21.78 2.1 24.0 1079300600028 23.43 3.7 26.0 1079300600029 59.49 4.0 25.0 1079300600030 69.07 41.0 22.5 1079300600031 ENDDATA 6 0 1079300600032 ENDSUBENT 31 0 1079300699999 SUBENT 10793007 20101022 13681079300700001 BIB 4 9 1079300700002 REACTION 1(90-TH-232(N,0),,EN) 1079300700003 2(90-TH-232(N,EL),,WID) 1079300700004 3(90-TH-232(N,G),,WID) 1079300700005 ERR-ANALYS (ERR-T) Quoted uncertainties include all statistical 1079300700006 and estimated systematic errors. 1079300700007 STATUS (DEP,10793004) 1079300700008 (DEP,10793005) 1079300700009 Data is combined average of shape and area analysis 1079300700010 HISTORY (20101022A) Updated error heading 1079300700011 ENDBIB 9 0 1079300700012 NOCOMMON 0 0 1079300700013 DATA 5 4 1079300700014 DATA 1DATA 2DATA-ERR 2DATA 3DATA-ERR 3 1079300700015 EV MILLI-EV MILLI-EV MILLI-EV MILLI-EV 1079300700016 21.78 2.1 0.1 24.0 1.5 1079300700017 23.43 3.7 0.2 26.0 1.5 1079300700018 59.49 4.0 0.3 25.0 2.0 1079300700019 69.07 41.2 3.0 22.6 2.0 1079300700020 ENDDATA 6 0 1079300700021 ENDSUBENT 20 0 1079300799999 SUBENT 10793008 20140625 14021079300800001 BIB 9 17 1079300800002 REACTION (90-TH-232(N,G)90-TH-233,,SIG) 1079300800003 SAMPLE Foil 5.69 by 5.69 by 0.1524-cm with inverse thickness 1079300800004 218 b/atom. 57.29 g metallic sample. 1079300800005 DETECTOR (GELI) High resolution germanium-lithium detector, 1079300800006 40-deg from neutron beam direction. 1079300800007 MONITOR (90-TH-232(N,G)90-TH-233,,SIG) To obtain an absolute 1079300800008 value for the capture cs, authors extrapolated their 1079300800009 measurements to 0.0253 eV and used the previously 1079300800010 measured value of 7.4 b for normalization. 1079300800011 METHOD Detection of 472.29-, 522.74-, and 566.61-keV gammas. 1079300800012 CORRECTION Corrected for dead time, finite sample thickness, gamma1079300800013 absorption and neutron multiple scattering 1079300800014 ERR-ANALYS (ERR-S) Statistical uncertainty given. 1079300800015 STATUS (TABLE) Table VIII, page 213 of J,NSE,72,202,1979. 1079300800016 HISTORY (20101022A) Updated error heading. Added standard data 1079300800017 to common section; deleted momentum. 1079300800018 (20140625A) BP: Corrected monitor reaction and value. 1079300800019 ENDBIB 17 0 1079300800020 COMMON 2 3 1079300800021 EN-NRM MONIT 1079300800022 EV B 1079300800023 0.0253 7.40 1079300800024 ENDCOMMON 3 0 1079300800025 DATA 3 45 1079300800026 EN DATA ERR-S 1079300800027 EV B B 1079300800028 0.0346 5.64 0.41 1079300800029 0.0368 6.54 0.34 1079300800030 0.0391 5.72 0.30 1079300800031 0.0417 5.81 0.27 1079300800032 0.0445 5.52 0.24 1079300800033 0.0476 5.02 0.21 1079300800034 0.0510 4.79 0.19 1079300800035 0.0549 4.76 0.17 1079300800036 0.0592 4.47 0.16 1079300800037 0.0640 4.32 0.15 1079300800038 0.0695 3.95 0.14 1079300800039 0.0756 4.06 0.13 1079300800040 0.0827 3.67 0.12 1079300800041 0.0907 3.58 0.12 1079300800042 0.1000 3.38 0.12 1079300800043 0.1108 3.28 0.12 1079300800044 0.1234 3.15 0.12 1079300800045 0.1384 2.82 0.13 1079300800046 0.1562 2.75 0.15 1079300800047 0.1777 2.62 0.16 1079300800048 0.2039 2.57 0.18 1079300800049 0.2364 2.48 0.20 1079300800050 0.2774 2.60 0.21 1079300800051 0.3301 2.10 0.20 1079300800052 0.3992 1.89 0.19 1079300800053 0.4927 1.58 0.17 1079300800054 0.5342 1.43 0.18 1079300800055 0.6002 1.23 0.16 1079300800056 0.6792 1.27 0.14 1079300800057 0.7749 1.06 0.13 1079300800058 0.8923 0.929 0.116 1079300800059 1.039 1.11 0.10 1079300800060 1.224 0.872 0.090 1079300800061 1.464 0.732 0.078 1079300800062 1.782 0.618 0.067 1079300800063 2.217 0.526 0.056 1079300800064 2.715 0.472 0.060 1079300800065 3.248 0.397 0.053 1079300800066 3.955 0.378 0.046 1079300800067 4.920 0.325 0.040 1079300800068 6.092 0.295 0.040 1079300800069 7.473 0.284 0.036 1079300800070 9.382 0.235 0.032 1079300800071 11.66 0.183 0.032 1079300800072 14.81 0.248 0.030 1079300800073 ENDDATA 47 0 1079300800074 ENDSUBENT 73 0 1079300899999 ENDENTRY 8 0 1079399999999