ENTRY 10871 20200229 14641087100000001 SUBENT 10871001 20200229 14641087100100001 BIB 14 49 1087100100002 INSTITUTE (1USAOHO) 1087100100003 REFERENCE (J,NP/A,296,95,1978) 1087100100004 AUTHOR (J.Rapaport,T.S.Cheema,D.E.Bainum,R.W.Finlay, 1087100100005 J.D.Carlson) 1087100100006 TITLE Neutron scattering from Pb-208 1087100100007 FACILITY (VDGT,1USAOHO) 11-MeV tandem van de Graaff 1087100100008 INC-SOURCE (P-T) Protons on 1.7-ATM tritium gas for 7-MeV neutrons1087100100009 (D-D) Deuterons on 2.7-ATM deuterium gas for 9 and 1087100100010 11-MeV neutrons 1087100100011 (D-T) Deuterons on 1.7-ATM tritium gas for 20 and 1087100100012 26-MeV neutrons 1087100100013 SAMPLE 1.88-cm high by 2.00-cm diameter with mass of 67.08-gm.1087100100014 enriched to 99.75% Pb-208. 1087100100015 DETECTOR (SCIN) 5.08-cm thick by 18.4-cm diameter liquid scin- 1087100100016 tillator with photomultiplier used for scattered 1087100100017 neutrons with 7-20 MeV incident energy. Shielded with 1087100100018 paraffin, iron, water, and lead. Shadow bar also used.1087100100019 neutron flux monitored with 5.0-cm diameter by 5.0-cm 1087100100020 long liquid scintillator. 1087100100021 MONITOR Normalized by measurements of neutron flux per monitor 1087100100022 count at zero degrees with scattering sample removed. 1087100100023 METHOD (TOF) Time of flight with a 3.74-M path for 7-MeV 1087100100024 neutrons and a path of 6.62-M for other energies. 1087100100025 Detector threshold set to half of maximum scattered 1087100100026 energy. Sample suspended by light thread in center of 1087100100027 tritium or deuterium gas. Gamma events eliminated with1087100100028 pulse shape discrimination. Background measured and 1087100100029 subtracted channel by channel after monitor normaliz- 1087100100030 ation. 1087100100031 CORRECTION Corrected for- 1087100100032 -dead time 1087100100033 -source anisotropy 1087100100034 -relative detector efficiency 1087100100035 -finite geometry (Monte-Carlo method) 1087100100036 -neutron flux attenuation (Monte-Carlo method) 1087100100037 -multiple scattering (Monte-Carlo method) 1087100100038 -compound nucleus contributions (computer code HELENE)1087100100039 compound elastic differential cross sections subtracted1087100100040 from 7-MeV data (less than 3-percent at minima of ang-1087100100041 ular distribution). No correction applied at higher 1087100100042 energies. 1087100100043 ERR-ANALYS (ERR-T) Overall relative uncertainty, 5-10% 1087100100044 (ERR-1,,5.) Normalization uncertainty, less than 5% 1087100100045 STATUS (APRVD) Approved by J. Rapaport, 79/6/25. 1087100100046 (TABLE) Data received in private comm., Rapaport, 79/4.1087100100047 HISTORY (19790426C) 1087100100048 (19840221A) BIB correction. 1087100100049 (20200203U) OS. Converted ton lower case, minor BIB 1087100100050 changes 1087100100051 ENDBIB 49 0 1087100100052 NOCOMMON 0 0 1087100100053 ENDSUBENT 52 0 1087100199999 SUBENT 10871002 20200229 14641087100200001 BIB 2 2 1087100200002 REACTION (82-PB-208(N,EL)82-PB-208,,DA) 1087100200003 HISTORY (19840221A) Data error corrected. 1087100200004 ENDBIB 2 0 1087100200005 NOCOMMON 0 0 1087100200006 DATA 5 116 1087100200007 EN EN-RSL ANG-CM DATA-CM ERR-T 1087100200008 MEV MEV ADEG MB/SR MB/SR 1087100200009 7.0 0.04 20.10 3395. 84.9 1087100200010 7.0 0.04 25.12 1857. 65.0 1087100200011 7.0 0.04 30.14 884.0 26.5 1087100200012 7.0 0.04 35.16 413.4 12.4 1087100200013 7.0 0.04 40.18 229.5 6.88 1087100200014 7.0 0.04 45.20 135.7 4.07 1087100200015 7.0 0.04 50.21 99.50 2.98 1087100200016 7.0 0.04 55.23 42.10 1.47 1087100200017 7.0 0.04 60.24 10.70 0.374 1087100200018 7.0 0.04 65.25 17.40 0.870 1087100200019 7.0 0.04 70.26 71.20 2.14 1087100200020 7.0 0.04 75.27 136.3 4.09 1087100200021 7.0 0.04 85.28 177.5 5.32 1087100200022 7.0 0.04 95.28 76.30 2.29 1087100200023 7.0 0.04 105.27 9.100 0.455 1087100200024 7.0 0.04 115.25 27.50 0.962 1087100200025 7.0 0.04 125.23 63.00 2.20 1087100200026 7.0 0.04 135.20 73.00 2.92 1087100200027 7.0 0.04 145.16 36.50 1.46 1087100200028 9.0 0.11 15.07 2969. 89.1 1087100200029 9.0 0.11 20.10 1388. 41.6 1087100200030 9.0 0.11 25.12 483.0 14.5 1087100200031 9.0 0.11 30.14 149.8 5.99 1087100200032 9.0 0.11 35.16 175.3 7.01 1087100200033 9.0 0.11 40.18 258.4 7.75 1087100200034 9.0 0.11 45.20 267.0 8.01 1087100200035 9.0 0.11 50.21 175.3 5.26 1087100200036 9.0 0.11 55.23 76.30 2.29 1087100200037 9.0 0.11 60.24 41.10 1.23 1087100200038 9.0 0.11 65.25 63.50 1.90 1087100200039 9.0 0.11 70.26 107.8 3.23 1087100200040 9.0 0.11 75.27 134.8 4.04 1087100200041 9.0 0.11 80.27 134.7 4.04 1087100200042 9.0 0.11 85.28 105.3 3.16 1087100200043 9.0 0.11 90.28 72.10 2.16 1087100200044 9.0 0.11 95.28 33.20 0.996 1087100200045 9.0 0.11 105.27 24.00 0.720 1087100200046 9.0 0.11 115.25 54.20 1.63 1087100200047 9.0 0.11 125.23 41.80 1.25 1087100200048 9.0 0.11 135.20 14.30 0.715 1087100200049 9.0 0.11 140.18 11.90 0.595 1087100200050 9.0 0.11 150.14 13.00 0.650 1087100200051 11.0 0.09 15.07 3215. 96.5 1087100200052 11.0 0.09 20.09 1089. 38.1 1087100200053 11.0 0.09 25.12 148.5 4.45 1087100200054 11.0 0.09 30.14 85.00 2.55 1087100200055 11.0 0.09 35.16 359.4 12.6 1087100200056 11.0 0.09 40.18 473.0 14.2 1087100200057 11.0 0.09 45.19 388.3 11.6 1087100200058 11.0 0.09 50.21 212.0 6.36 1087100200059 11.0 0.09 55.23 79.70 3.19 1087100200060 11.0 0.09 60.24 58.60 1.76 1087100200061 11.0 0.09 65.25 99.50 2.98 1087100200062 11.0 0.09 70.26 135.4 4.06 1087100200063 11.0 0.09 75.27 128.3 3.85 1087100200064 11.0 0.09 80.27 89.10 3.12 1087100200065 11.0 0.09 85.27 48.10 2.16 1087100200066 11.0 0.09 90.28 26.50 1.19 1087100200067 11.0 0.09 95.27 17.80 1.69 1087100200068 11.0 0.09 100.27 22.80 1.03 1087100200069 11.0 0.09 105.27 26.40 0.924 1087100200070 11.0 0.09 110.26 32.40 1.13 1087100200071 11.0 0.09 115.25 30.20 1.06 1087100200072 11.0 0.09 120.24 25.20 0.882 1087100200073 11.0 0.09 125.23 14.40 0.504 1087100200074 11.0 0.09 135.19 9.900 0.891 1087100200075 11.0 0.09 145.16 19.40 0.776 1087100200076 20.0 0.11 15.07 5089. 153. 1087100200077 20.0 0.11 20.09 1081. 32.4 1087100200078 20.0 0.11 25.12 105.0 3.67 1087100200079 20.0 0.11 30.14 178.0 5.34 1087100200080 20.0 0.11 35.16 262.0 7.86 1087100200081 20.0 0.11 40.18 157.0 5.49 1087100200082 20.0 0.11 45.19 50.00 3.00 1087100200083 20.0 0.11 50.21 15.90 1.59 1087100200084 20.0 0.11 55.23 10.50 2.10 1087100200085 20.0 0.11 60.24 12.66 1.52 1087100200086 20.0 0.11 65.25 18.60 1.86 1087100200087 20.0 0.11 70.26 18.00 1.80 1087100200088 20.0 0.11 75.27 12.88 1.29 1087100200089 20.0 0.11 85.27 7.26 1.16 1087100200090 20.0 0.11 90.28 7.930 0.952 1087100200091 20.0 0.11 100.27 6.470 0.647 1087100200092 20.0 0.11 110.26 1.990 0.279 1087100200093 20.0 0.11 120.24 3.580 0.465 1087100200094 20.0 0.11 135.19 3.690 0.406 1087100200095 20.0 0.11 145.16 4.690 0.516 1087100200096 26.0 0.06 15.07 3496. 69.9 1087100200097 26.0 0.06 20.09 537.4 11.8 1087100200098 26.0 0.06 25.12 32.90 1.25 1087100200099 26.0 0.06 30.14 117.0 5.03 1087100200100 26.0 0.06 35.16 84.30 4.81 1087100200101 26.0 0.06 40.18 51.70 1.09 1087100200102 26.0 0.06 45.19 53.60 2.95 1087100200103 26.0 0.06 50.21 32.80 0.853 1087100200104 26.0 0.06 55.23 20.80 1.10 1087100200105 26.0 0.06 60.24 35.50 1.10 1087100200106 26.0 0.06 65.25 48.40 1.31 1087100200107 26.0 0.06 70.26 37.80 1.21 1087100200108 26.0 0.06 75.27 21.20 1.06 1087100200109 26.0 0.06 80.27 20.50 0.82 1087100200110 26.0 0.06 85.27 22.40 1.08 1087100200111 26.0 0.06 90.28 23.90 0.765 1087100200112 26.0 0.06 95.27 15.30 0.964 1087100200113 26.0 0.06 100.27 8.100 0.810 1087100200114 26.0 0.06 105.27 6.100 0.616 1087100200115 26.0 0.06 110.26 8.500 0.688 1087100200116 26.0 0.06 115.25 6.500 0.656 1087100200117 26.0 0.06 120.24 4.000 0.724 1087100200118 26.0 0.06 125.23 4.200 0.449 1087100200119 26.0 0.06 130.21 5.200 0.530 1087100200120 26.0 0.06 135.19 4.600 0.488 1087100200121 26.0 0.06 140.18 3.800 0.384 1087100200122 26.0 0.06 145.16 5.400 0.540 1087100200123 26.0 0.06 150.14 4.000 0.692 1087100200124 26.0 0.06 155.12 5.400 0.821 1087100200125 ENDDATA 118 0 1087100200126 ENDSUBENT 125 0 1087100299999 ENDENTRY 2 0 1087199999999