ENTRY 22654 20020209 00002265400000001 SUBENT 22654001 20020209 00002265400100001 BIB 13 67 2265400100002 TITLE Neutron Capture Cross Section of 232Th 2265400100003 AUTHOR (K.WISSHAK,F.VOSS,F.KAEPPELER) 2265400100004 INSTITUTE (2GERKFK) Wisshak, Voss, Kaeppeler 2265400100005 REFERENCE (J,NSE,137,183,2001) Main Reference, Data are Given 2265400100006 (J,NIM/A,292,595,1990) .Detailed Descripton of 2265400100007 4Pi-Ba-F2 Detetor 2265400100008 (J,PR/C,42,(4),1731,199004) .Experimental Details 2265400100009 (J,PR/C,45,2470,1992) .Experimental and 2265400100010 Analysis Details 2265400100011 (J,PR/C,48,1401,1993) .Experimental Details 2265400100012 (R,FZKA-6275,1999) .Experimental, Methodical 2265400100013 And Analysis Details 2265400100014 METHOD (TOF) Flight Path is 79 Cm For Measuring Neutron 2265400100015 Capture and 260 Cm For Measuring Neutron 2265400100016 Transmission 2265400100017 (SITA) Single Target Arrangment 2265400100018 FACILITY (VDG,2GERKFK) 3.75 MV Van De Graaff Accelerator 2265400100019 Pulse Width is Apprx. 1 Ns, Repetition Rate 250 Khz, 2265400100020 Average Beam Current 2.1 Microamperes 2265400100021 DETECTOR (D4PI,SCIN) Karlsruhe 4PI Barium Fluoride Detector For 2265400100022 Detection of Capture Gamma-Rays. Detector Consists 2265400100023 Of 42 Hexagonal and Pentagonal Crystals Forming a 2265400100024 Spherical Shell of Ba-F2 with 10 Cm Inner Radius 2265400100025 And 15 Cm Thickness. Resolution of Energy is 7 % 2265400100026 At 2.5 MeV, Time Resolution 500 Picosec, Peak Effi- 2265400100027 Ciency 90 % at 1 MeV, Capture Events Registration 2265400100028 Probability is 95 % 2265400100029 (GLASD) Li-6 Glass Detector For Neutron Flux 2265400100030 Monitoring and Measuring Neutron Transmission 2265400100031 INC-SOURCE (P-LI7) Metallic Li Target of About 0.5 Mg/Cm2 Thick- 2265400100032 Ness on 0.2 mm Thick Copper Backing. 2265400100033 INC-SPECT .Proton Energy is 30 and 100 KeV Above the Reaction 2265400100034 Threshold 1.881 MeV Giving Continuous Neutron 2265400100035 Energy Distribution in Energy Ranges 5-100 and 5-225 2265400100036 KeV 2265400100037 SAMPLE .Thorium Samples were Metallic Disks with 15 mm Diam., 2265400100038 0.5 mm (1.5062E-3 ATOMS/BARN) And 0.9 mm (2.6114E-3 2265400100039 ATOMS/B) Thickness,1.0256 and 1.7781 Gram Weight, 2265400100040 11.62+-0.11 Gram/Cm3 Gravimetric Density 2265400100041 -Metallic Gold Samples As Standard Cross Sections 2265400100042 Two Metallic Disks 15 mm Diameter, O.4 mm (APRX 2.248 2265400100043 E-3 ATOMS/BARN EACH) Thickness, Aprx 1.299 Gram Weight2265400100044 -Graphite Samples were Used to Simulate the Background 2265400100045 Due to Neutron Scattering. 15 mm Diam., 2.5 mm 2265400100046 (13.6103E-3 ATOMS/B) Thickness, Weight 0.4797 Gram 2265400100047 CORRECTION .Corrections were Made For Natural Radioactivity of 2265400100048 Thorium Samples, For Number of Unobserved Events, 2265400100049 For Iple Scattering and Self-Shielding, 2265400100050 For Scattering on Samples' Impurities, For the Shift 2265400100051 Of the Sum Energy Spectrum 2265400100052 ERR-ANALYS (ERR-T) Total Error Equal to Sum 0F Statistical and 2265400100053 Total Systematic Error (MONITOR ERROR NOT 2265400100054 INCLUDED) 2265400100055 (ERR-1) Total Systematic Error = Quadratic Sum of 2265400100056 Constituent Errors 2265400100057 (ERR-2) Flight Path Error 2265400100058 (ERR-3) Neutron Flux Normalization Error 2265400100059 (ERR-4) Sample Mass Error - Elemental Impurities and 2265400100060 Oxigen Content 2265400100061 (ERR-5) Error Due to the Eveluation-1/Evaluation-2 2265400100062 Difference 2265400100063 (ERR-6) Error Due to Undetected Events 2265400100064 (ERR-7) Multiple Scattering Abd Self-Shielding 2265400100065 Correction Error 2265400100066 (ERR-8) Error Due to the Energy Shift 2265400100067 HISTORY (20020208C) + + Compiled by S.M. + + 2265400100068 (20020209U) Last checking has been done. 2265400100069 ENDBIB 67 0 2265400100070 COMMON 8 6 2265400100071 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 2265400100072 ERR-7 ERR-8 2265400100073 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2265400100074 PER-CENT PER-CENT 2265400100075 1.6 0.1 0.2 0.5 1. 0.82265400100076 0.5 0.5 2265400100077 ENDCOMMON 6 0 2265400100078 ENDSUBENT 77 0 2265400199999 SUBENT 22654002 20020209 00002265400200001 BIB 3 5 2265400200002 REACTION ((90-TH-232(N,G)90-TH-233,,SIG,,AV)/ 2265400200003 (79-AU-197(N,G)79-AU-198,,SIG,,AV)) Averaged Over 2265400200004 Energy Interval Given in Data Section 2265400200005 MONITOR .Absolute Measurement 2265400200006 STATUS . Data are Taken from Table V of Main Reference 2265400200007 ENDBIB 5 0 2265400200008 NOCOMMON 0 0 2265400200009 DATA 5 17 2265400200010 EN-MIN EN-MAX DATA ERR-S ERR-T 2265400200011 KEV KEV NO-DIM PER-CENT PER-CENT 2265400200012 5. 7.5 0.7436 3.7 4.0 2265400200013 7.5 10. 0.8432 2.6 3.1 2265400200014 10. 12.5 0.7888 2.0 2.6 2265400200015 12.5 15. 0.8544 1.7 2.3 2265400200016 15. 20. 0.8400 1.1 1.9 2265400200017 20. 25. 0.9822 0.8 1.8 2265400200018 25. 30. 0.9204 0.7 1.7 2265400200019 30. 40. 0.9358 0.6 1.7 2265400200020 40. 50. 0.9876 0.6 1.7 2265400200021 50. 60. 0.9147 0.6 1.7 2265400200022 60. 80. 0.8037 0.5 1.7 2265400200023 80. 100. 0.7516 0.5 1.7 2265400200024 100. 120. 0.6814 0.6 1.7 2265400200025 120. 150. 0.6558 0.9 1.8 2265400200026 150. 175. 0.6417 1.0 1.9 2265400200027 175. 200. 0.6263 1.0 1.9 2265400200028 200. 225. 0.6183 1.5 2.2 2265400200029 ENDDATA 19 0 2265400200030 ENDSUBENT 29 0 2265400299999 SUBENT 22654003 20020209 00002265400300001 BIB 4 7 2265400300002 REACTION (90-TH-232(N,G)90-TH-233,,SIG,,AV) Averaged Over 2265400300003 Energy Interval Given in Data Section 2265400300004 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 2265400300005 MONIT-REF (,W.RATYNSKI+,J,PR/C,37,595,1988) 2265400300006 (,V.MCLANE+,B,NEUT.CS 2,,1988) 2265400300007 STATUS . Data are Taken from Table V of Main Reference 2265400300008 (DEP,22654002) 2265400300009 ENDBIB 7 0 2265400300010 COMMON 1 3 2265400300011 MONIT-ERR 2265400300012 PER-CENT 2265400300013 1.5 2265400300014 ENDCOMMON 3 0 2265400300015 DATA 5 17 2265400300016 EN-MIN EN-MAX DATA ERR-T MONIT 2265400300017 KEV KEV MB PER-CENT MB 2265400300018 5. 7.5 1238.9 4. 1726.7 2265400300019 7.5 10. 1025.2 3.1 1215.7 2265400300020 10. 12.5 841.5 2.6 1066.7 2265400300021 12.5 15. 750.2 2.3 878. 2265400300022 15. 20. 620.5 1.9 738.8 2265400300023 20. 25. 589.4 1.8 600. 2265400300024 25. 30. 525.4 1.7 570.8 2265400300025 30. 40. 468.3 1.7 500.4 2265400300026 40. 50. 428. 1.7 433.3 2265400300027 50. 60. 356.4 1.7 389.6 2265400300028 60. 80. 280.8 1.7 349.4 2265400300029 80. 100. 224.2 1.7 298.3 2265400300030 100. 120. 197.7 1.7 290.1 2265400300031 120. 150. 179.8 1.8 274.1 2265400300032 150. 175. 169.2 1.9 263.7 2265400300033 175. 200. 158.2 1.9 252.6 2265400300034 200. 225. 153.6 2.2 248.5 2265400300035 ENDDATA 19 0 2265400300036 ENDSUBENT 35 0 2265400399999 ENDENTRY 3 0 2265499999999