ENTRY 10735 20090912 13551073500000001 SUBENT 10735001 20090912 13551073500100001 BIB 8 13 1073500100002 INSTITUTE (1USAANL) 1073500100003 REFERENCE (R,ANL-NDM-42,197803) 1073500100004 AUTHOR (W.P.Poenitz,D.L.Smith) 1073500100005 TITLE Fast neutron radiative capture cross sections of 232Th 1073500100006 FACILITY (DYNAM,1USAANL) Tandem dynamitron 1073500100007 INC-SOURCE (P-LI7) 3-Li-7(p,n)4-Be-7 at all energies. 1073500100008 For 50-300keV, a pseudo white neutron spectrum was 1073500100009 used. 1073500100010 Between 500keV and 2MeV, monoenergetic neutrons were 1073500100011 used. 1073500100012 STATUS (TABLE) Data taken from Table 3 ib report. 1073500100013 HISTORY (19780801C) 1073500100014 (20090911A) VM:Updated to new date formats,lower case. 1073500100015 ENDBIB 13 0 1073500100016 NOCOMMON 0 0 1073500100017 ENDSUBENT 16 0 1073500199999 SUBENT 10735002 20090912 13551073500200001 BIB 8 22 1073500200002 REACTION (90-TH-232(N,G)90-TH-233,,SIG) 1073500200003 SAMPLE The samples were .03cm thick strips of thorium metal 1073500200004 of about 2.65 cm width and 5.3 cm length. 1073500200005 DETECTOR (STANK)Large liquid scintillator tank. 1073500200006 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) ENDF/B-IV cross section.1073500200007 METHOD (TOF) Time of flight. Prompt gamma-ray detection. 1073500200008 CORRECTION Corrections were applied for: 1073500200009 . transmission through the sample, 1073500200010 . elastic and inelastic scattering of neutrons within 1073500200011 the sample 1073500200012 . change in efficiency of the detector with changing 1073500200013 maximum energy of the gamma cascades. 1073500200014 At higher energies corrections were applied for the 1073500200015 second neutron group obtained with the 7Li(p,n) 1073500200016 reaction and for the fission events in the thorium 1073500200017 samples. 1073500200018 ERR-ANALYS (ERR-T) Major uncertainties for the shape data are 1073500200019 due to normalization (3.8% at 500keV and 5.5% below) 1073500200020 and the gold reference cross section (5%). 1073500200021 (ERR-S) Statistical uncertainties. 1073500200022 (ERR-SYS) Systematic uncertainties. 1073500200023 HISTORY (20090911A) Uncertainties updated. 1073500200024 ENDBIB 22 0 1073500200025 COMMON 3 3 1073500200026 ERR-S ERR-SYS EN-NRM 1073500200027 PER-CENT PER-CENT KEV 1073500200028 3. 2. 500. 1073500200029 ENDCOMMON 3 0 1073500200030 DATA 5 15 1073500200031 EN EN-ERR EN-RSL DATA ERR-T 1073500200032 MEV MEV MEV B B 1073500200033 0.0584 0.005 0.0032 0.377 0.031 1073500200034 0.0648 0.005 0.0035 0.340 0.028 1073500200035 0.0724 0.005 0.0040 0.303 0.025 1073500200036 0.0810 0.005 0.0049 0.251 0.021 1073500200037 0.105 0.005 0.0072 0.216 0.018 1073500200038 0.121 0.005 0.0090 0.211 0.017 1073500200039 0.141 0.005 0.012 0.200 0.016 1073500200040 0.167 0.005 0.015 0.192 0.016 1073500200041 0.200 0.005 0.019 0.172 0.014 1073500200042 0.244 0.005 0.026 0.142 0.012 1073500200043 0.305 0.005 0.035 0.152 0.012 1073500200044 0.50 0.01 0.03 0.155 0.011 1073500200045 0.60 0.01 0.03 0.168 0.012 1073500200046 0.70 0.01 0.03 0.177 0.013 1073500200047 0.85 0.01 0.03 0.166 0.012 1073500200048 ENDDATA 17 0 1073500200049 ENDSUBENT 48 0 1073500299999 SUBENT 10735003 20090912 13551073500300001 BIB 9 36 1073500300002 REACTION (90-TH-232(N,G)90-TH-233,,SIG) 1073500300003 MONITOR (92-U-235(N,F),,SIG) 1073500300004 SAMPLE The thorium samples were 0.013 or 0.020-cm-thick discs 1073500300005 of metallic thorium, 99.9% 232Th with a diameter of 1073500300006 1.588cm. 1073500300007 METHOD (ACTIV) 1073500300008 DECAY-DATA (91-PA-233,,DG,311.,0.377) 1073500300009 DETECTOR (GELI) Activities measured by a coaxial germanium- 1073500300010 lithium detector. 1073500300011 CORRECTION Corrections were applied for: 1073500300012 . bias in the detected fission counts (1-2%) 1073500300013 . total fission fragment absorption (0.6-2.5%) 1073500300014 . neutrons scattered in the source material,the 1073500300015 fission counter,and sample backings (0.2-3.8%) 1073500300016 Angular distribution of the source,different sample 1073500300017 sizes, distance from the source, path through the 1073500300018 sample, neutron flux as a function of energy and 1073500300019 transmission through the sample backings were all 1073500300020 accounted for. 1073500300021 ERR-ANALYS (ERR-T) Total uncertainty 1073500300022 (ERR-S) Statistical uncertainty 1073500300023 Systematic errors due to uncertainty in: 1073500300024 (ERR-1) fissile deposit mass, 1073500300025 (ERR-2) detector counting efficiency, 1073500300026 (ERR-3) thorium mass, 1073500300027 (ERR-4) 233Pa half-life, 1073500300028 (ERR-5) 235U(n,f) cross section, 1073500300029 (ERR-6,0.6,1.0) for sample gamma-ray absorption, 1073500300030 (ERR-7,0.1,0.8) neutron multiple scattering, 1073500300031 (ERR-8,0.5,2.0) background, 1073500300032 (ERR-9,0.5,1.6) sample geometry and neutron-source 1073500300033 anisotropy, 1073500300034 (ERR-10) for dead-time, 1073500300035 (ERR-11) statistics of fission counting, 1073500300036 (ERR-12) gamma-ray counting distance reproducibility. 1073500300037 HISTORY (20090911A) Uncertainties added in coded form. 1073500300038 ENDBIB 36 0 1073500300039 COMMON 8 6 1073500300040 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-10 1073500300041 ERR-11 ERR-12 1073500300042 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 1073500300043 PER-CENT PER-CENT 1073500300044 1. 0.9 0.5 0.5 3. 0.2 1073500300045 0.2 0.5 1073500300046 ENDCOMMON 6 0 1073500300047 DATA 6 7 1073500300048 EN EN-ERR EN-RSL DATA ERR-T ERR-S 1073500300049 MEV MEV MEV B B PER-CENT 1073500300050 0.244 0.006 0.038 0.147 0.006 1.2 1073500300051 0.500 0.010 0.055 0.155 0.006 0.4 1073500300052 0.622 0.011 0.052 0.180 0.008 1.4 1073500300053 1.013 0.011 0.057 0.137 0.006 1.4 1073500300054 1.497 0.010 0.049 0.111 0.005 2.5 1073500300055 1.984 0.012 0.050 0.076 0.008 10.5 1073500300056 2.480 0.015 0.080 0.050 0.003 3.6 1073500300057 ENDDATA 9 0 1073500300058 ENDSUBENT 57 0 1073500399999 SUBENT 10735004 20090912 13551073500400001 BIB 10 22 1073500400002 REACTION (90-TH-232(N,G)90-TH-233,,SIG) 1073500400003 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 1073500400004 MONIT-REF (10432001,MACKLIN+,J,PR/C,11,1270,1975) 1073500400005 (,W.P Poenitz,C,70ANL,,1970) paper number and page not 1073500400006 given. 1073500400007 SAMPLE 0.020-cm thick metallic thorium sample. 1073500400008 METHOD (ACTIV) 1073500400009 DECAY-DATA (91-PA-233,,DG,311.,0.377) 1073500400010 DETECTOR (GELI) Germanium-lithium detector 1073500400011 CORRECTION Corrections were made for gamma-ray absorption of the 1073500400012 gold disc. 1073500400013 Correction for scattered neutrons and self shielding 1073500400014 for the measured ratio is small (0.3%), though 1073500400015 corrections for individual samples are in 2-3% range. 1073500400016 ERR-ANALYS (ERR-T) Major contributions to uncertainty are due to: 1073500400017 . counting statistics of the 233Pa activity, 1073500400018 . gold cross section (3%) 1073500400019 Other uncertainties are similar to those in for the 1073500400020 data relative to235U and are small(<1%). 1073500400021 (ERR-S) Statistical uncertainty. 1073500400022 HISTORY (19790501A) Data unit corrected. 1073500400023 (20090911A) Uncertainties updated. 1073500400024 ENDBIB 22 0 1073500400025 COMMON 2 3 1073500400026 MONIT MONIT-ERR 1073500400027 B B 1073500400028 0.576 0.017 1073500400029 ENDCOMMON 3 0 1073500400030 DATA 6 1 1073500400031 EN EN-ERR EN-RSL DATA ERR-T ERR-S 1073500400032 MEV MEV MEV B B PER-CENT 1073500400033 0.030 0.001 0.013 0.464 0.028 4.7 1073500400034 ENDDATA 3 0 1073500400035 ENDSUBENT 34 0 1073500499999 ENDENTRY 4 0 1073599999999