ENTRY M0499 20220130 M119M0499 0 1 SUBENT M0499001 20220130 M119M0499 1 1 BIB 13 66 M0499 1 2 TITLE Photoneutron cross sections in Li-7. M0499 1 3 AUTHOR (H.Ferdinande,N.K.Sherman,K.H.Lokan,C.K.Ross) M0499 1 4 REFERENCE (J,CJP,55,428,1977) M0499 1 5 INSTITUTE (1CANOTC) M0499 1 6 FACILITY (LINAC,1CANOTC) M0499 1 7 INC-SOURCE (BRST) M0499 1 8 SAMPLE 500 g cylindrical target enriched to 99.9% Li-7. The M0499 1 9 target was wrapped in transparent tape to protect it M0499 1 10 from the atmosphere. M0499 1 11 METHOD (TOF) Photoneutrons were detected at an angle of 90 M0499 1 12 degrees with respect to the photon beam by a M0499 1 13 conventional time-of-flight system having a flight M0499 1 14 path of 32 m and a resolution of 0.4 ns/m. M0499 1 15 DETECTOR (SCIN) M0499 1 16 ANALYSIS (UNFLD) The bremsstrahlung end-point energy was M0499 1 17 increased in 2 MeV steps from 13 to 25 MeV. At each M0499 1 18 energy, photoneutron T-O-F spectra were measured from M0499 1 19 Li-7 and from (H-2)O and (D-2)O targets. This M0499 1 20 provided a ratio measurement of the 90-degrees M0499 1 21 differential ground-state cross section for the M0499 1 22 Li-7(g,n0)Li-6 reaction relative to H-2(g,n) M0499 1 23 differential cross section. Near 14.3 MeV a M0499 1 24 ground-state neutron from Li-7 has the same energy M0499 1 25 (7 MeV) as a deuterium photoneutron (Sherman 1970). M0499 1 26 Each time-of-flight spectrum was converted to a M0499 1 27 neutron energy distribution. Using the information M0499 1 28 about photon spectrum these energy distributions M0499 1 29 were converted into cross section. At each end-point M0499 1 30 energy the photon spectrum was measured from the M0499 1 31 difference between photoneutron spectra of M0499 1 32 geometrically identical targets of heavy and light M0499 1 33 water. Because the first excited state in final M0499 1 34 nucleus Li-6 lies at energy 2.185 MeV those neutrons M0499 1 35 resulting from photons within 2.185 MeV of the M0499 1 36 end-point energy can only result from the M0499 1 37 transitions to the ground state of Li-6. Although M0499 1 38 the 1.377 MeV gap between the first and second M0499 1 39 excited states in Li-6 is less than 2 MeV end-point M0499 1 40 steps used an approximate first-excited-state cross M0499 1 41 section was extracted by substracting the M0499 1 42 groundstate component from the experimental M0499 1 43 photoneutron spectrum for each run. This component M0499 1 44 was obtained by folding the measured ground-state M0499 1 45 cross section with the fitted photon distribution, M0499 1 46 to obtain the ground-state neutron component for M0499 1 47 this end-point energy. The ground-state component M0499 1 48 was substracted and the residual neutron spectrum M0499 1 49 was converted back to a cross section by dividing by M0499 1 50 the calculated bremsstrahlung spectrum. M0499 1 51 CORRECTION Corrections were used for detector dead time and M0499 1 52 detector efficiency. M0499 1 53 COMMENT Photoneutron energy spectra from Li-7 have been M0499 1 54 measured by time-of-flight method, for M0499 1 55 bremsstrahlung end-point energies increasing in 2 M0499 1 56 mev steps from 13 to 25 MeV. The ground-state and M0499 1 57 approximate firstexcited-state differential cross M0499 1 58 sections at 90 degrees have been obtained from 8.5 M0499 1 59 to 23 MeV. No pronounced fine structure has been M0499 1 60 observed. The integrated cross section values for M0499 1 61 both cross sections were obtained also. M0499 1 62 HISTORY (19910218C) M0499 1 63 (20130627A) Corrected by V.Varlamov: REACTION, M0499 1 64 STATUS, dates, lowercase. M0499 1 65 (20220130A) Corrected by V.Varlamov: MONITOR, PART-DET,M0499 1 66 COMMON, STATUS, EN-SEC in SUBENTs 002 - 005, INT,,BRA M0499 1 67 -> INT,,BRS in REACTION of SUBENTs 004,005. M0499 1 68 ENDBIB 66 0 M0499 1 69 COMMON 1 3 M0499 1 70 ANG M0499 1 71 ADEG M0499 1 72 90. M0499 1 73 ENDCOMMON 3 0 M0499 1 74 ENDSUBENT 73 0 M0499 199999 SUBENT M0499002 20220130 M119M0499 2 1 BIB 4 9 M0499 2 2 REACTION (3-LI-7(G,N)3-LI-6,PAR,DA,,BRS) M0499 2 3 ERR-ANALYS No information. M0499 2 4 STATUS (CURVE) Data presented on Fig. 4 M0499 2 5 of Can.J.Phys.,55(1977)428. M0499 2 6 The USA NIST digitizing. M0499 2 7 HISTORY (20130627A) Corrected by V.Varlamov: BRA -> BRS, M0499 2 8 ERR-ANALYS. M0499 2 9 (20220130A) Corrected by V.Varlamov: EN-SEC, COMMON, M0499 2 10 DATA (SUBENTs 002 and 003 merged), STATUS. M0499 2 11 ENDBIB 9 0 M0499 2 12 NOCOMMON 0 0 M0499 2 13 DATA 3 183 M0499 2 14 E-LVL EN DATA M0499 2 15 MEV MEV MU-B/SR M0499 2 16 0.0 8.4 1.54 M0499 2 17 0.0 8.63 2.93 M0499 2 18 0.0 8.64 .21 M0499 2 19 0.0 8.77 1.93 M0499 2 20 0.0 8.85 7.04 M0499 2 21 0.0 8.95 5.7 M0499 2 22 0.0 9.13 7.42 M0499 2 23 0.0 9.27 8.8 M0499 2 24 0.0 9.36 9.83 M0499 2 25 0.0 9.45 10.18 M0499 2 26 0.0 9.6 7.48 M0499 2 27 0.0 9.73 10.56 M0499 2 28 0.0 9.87 12.96 M0499 2 29 0.0 9.9 18.4 M0499 2 30 0.0 10.06 26.93 M0499 2 31 0.0 10.16 25.92 M0499 2 32 0.0 10.3 24.92 M0499 2 33 0.0 10.35 26.97 M0499 2 34 0.0 10.44 27.66 M0499 2 35 0.0 10.53 28.69 M0499 2 36 0.0 10.63 25.64 M0499 2 37 0.0 10.76 28.72 M0499 2 38 0.0 10.9 29.08 M0499 2 39 0.0 11.04 27.4 M0499 2 40 0.0 11.17 31.83 M0499 2 41 0.0 11.31 34.57 M0499 2 42 0.0 11.4 35.27 M0499 2 43 0.0 11.54 33.92 M0499 2 44 0.0 11.59 35.29 M0499 2 45 0.0 11.68 36.66 M0499 2 46 0.0 11.69 35.3 M0499 2 47 0.0 11.87 33.97 M0499 2 48 0.0 11.91 35.33 M0499 2 49 0.0 12.09 37.74 M0499 2 50 0.0 12.19 35.71 M0499 2 51 0.0 12.29 36.06 M0499 2 52 0.0 12.38 36.41 M0499 2 53 0.0 12.61 37.8 M0499 2 54 0.0 12.7 36.46 M0499 2 55 0.0 12.84 37.15 M0499 2 56 0.0 12.94 37.51 M0499 2 57 0.0 13.03 38.54 M0499 2 58 0.0 13.11 41.95 M0499 2 59 0.0 13.26 39.59 M0499 2 60 0.0 13.35 41.30 M0499 2 61 0.0 13.58 42.01 M0499 2 62 0.0 13.72 40.67 M0499 2 63 0.0 13.86 42.39 M0499 2 64 0.0 13.95 43.42 M0499 2 65 0.0 14.08 47.52 M0499 2 66 0.0 14.22 47.88 M0499 2 67 0.0 14.37 45.17 M0499 2 68 0.0 14.45 48.25 M0499 2 69 0.0 14.6 45.55 M0499 2 70 0.0 14.73 47.94 M0499 2 71 0.0 14.83 45.24 M0499 2 72 0.0 14.97 45.93 M0499 2 73 0.0 14.98 44.23 M0499 2 74 0.0 15.22 40.86 M0499 2 75 0.0 15.3 45.98 M0499 2 76 0.0 15.31 42.92 M0499 2 77 0.0 15.43 49.39 M0499 2 78 0.0 15.62 47.72 M0499 2 79 0.0 15.81 48.42 M0499 2 80 0.0 15.9 49.8 M0499 2 81 0.0 15.96 44.7 M0499 2 82 0.0 16.04 49.13 M0499 2 83 0.0 16.1 42.34 M0499 2 84 0.0 16.19 44.05 M0499 2 85 0.0 16.28 46.1 M0499 2 86 0.0 16.38 42.72 M0499 2 87 0.0 16.42 45.78 M0499 2 88 0.0 16.57 42.4 M0499 2 89 0.0 16.67 40.71 M0499 2 90 0.0 16.81 38.69 M0499 2 91 0.0 16.95 41.09 M0499 2 92 0.0 16.99 43.81 M0499 2 93 0.0 17.13 41.79 M0499 2 94 0.0 17.14 40.09 M0499 2 95 0.0 17.32 41.48 M0499 2 96 0.0 17.47 38.09 M0499 2 97 0.0 17.56 39.47 M0499 2 98 0.0 17.6 40.49 M0499 2 99 0.0 17.75 38.47 M0499 2 100 0.0 17.89 36.79 M0499 2 101 0.0 17.96 46.32 M0499 2 102 0.0 18.11 44.64 M0499 2 103 0.0 18.19 48.05 M0499 2 104 0.0 18.34 43.99 M0499 2 105 0.0 18.44 41.62 M0499 2 106 0.0 18.68 40.29 M0499 2 107 0.0 18.71 45.74 M0499 2 108 0.0 18.79 49.83 M0499 2 109 0.0 18.95 43.39 M0499 2 110 0.0 19.14 43.41 M0499 2 111 0.0 19.17 46.82 M0499 2 112 0.0 19.33 42.42 M0499 2 113 0.0 19.52 41.42 M0499 2 114 0.0 19.69 44.51 M0499 2 115 0.0 19.85 39.08 M0499 2 116 0.0 19.97 45.22 M0499 2 117 0.0 20.03 42.51 M0499 2 118 0.0 20.12 44.56 M0499 2 119 0.0 20.3 45.27 M0499 2 120 0.0 20.45 41.88 M0499 2 121 0.0 20.6 37.48 M0499 2 122 0.0 20.81 44.99 M0499 2 123 0.0 20.91 43.64 M0499 2 124 0.0 21.14 47.75 M0499 2 125 0.0 21.36 51.78 M0499 2 126 0.0 21.5 52.22 M0499 2 127 0.0 21.7 44.77 M0499 2 128 0.0 21.93 45.82 M0499 2 129 0.0 22.07 48.22 M0499 2 130 0.0 22.2 52.65 M0499 2 131 0.0 22.46 42.82 M0499 2 132 0.0 22.68 45.91 M0499 2 133 0.0 22.78 43.55 M0499 2 134 0.0 23.06 42.9 M0499 2 135 0.0 23.48 44.32 M0499 2 136 0.0 23.81 43.34 M0499 2 137 0.0 23.91 40.97 M0499 2 138 0.0 24.1 38.28 M0499 2 139 0.0 24.12 37.94 M0499 2 140 0.0 24.29 40. M0499 2 141 0.0 24.37 45.11 M0499 2 142 0.0 24.62 38. M0499 2 143 0.0 24.85 36.67 M0499 2 144 0.0 25.03 42.48 M0499 2 145 0.0 25.21 42.84 M0499 2 146 0.0 25.39 48.31 M0499 2 147 2.185 10.41 10.64 M0499 2 148 2.185 10.7 24.54 M0499 2 149 2.185 10.79 24.89 M0499 2 150 2.185 11.02 26.27 M0499 2 151 2.185 11.3 25.64 M0499 2 152 2.185 11.61 30.75 M0499 2 153 2.185 12.3 32.55 M0499 2 154 2.185 12.63 30.91 M0499 2 155 2.185 12.87 31.28 M0499 2 156 2.185 13.24 31.67 M0499 2 157 2.185 13.58 24.29 M0499 2 158 2.185 13.88 18.93 M0499 2 159 2.185 14.22 11.89 M0499 2 160 2.185 14.46 9.89 M0499 2 161 2.185 14.69 9.93 M0499 2 162 2.185 14.93 9.96 M0499 2 163 2.185 15.06 9.98 M0499 2 164 2.185 15.38 14.76 M0499 2 165 2.185 15.56 15.13 M0499 2 166 2.185 15.71 13.46 M0499 2 167 2.185 16.03 15.19 M0499 2 168 2.185 16.17 14.88 M0499 2 169 2.185 16.4 13.9 M0499 2 170 2.185 16.67 19.34 M0499 2 171 2.185 16.87 14.64 M0499 2 172 2.185 17.05 14.33 M0499 2 173 2.185 17.35 9.31 M0499 2 174 2.185 17.6 18.47 M0499 2 175 2.185 17.98 14.13 M0499 2 176 2.185 18.25 17.22 M0499 2 177 2.185 18.57 19.97 M0499 2 178 2.185 18.79 24.39 M0499 2 179 2.185 18.98 24.42 M0499 2 180 2.185 19.19 14.99 M0499 2 181 2.185 19.57 13.02 M0499 2 182 2.185 19.75 14.74 M0499 2 183 2.185 20.04 26.6 M0499 2 184 2.185 20.23 25.96 M0499 2 185 2.185 20.43 21.59 M0499 2 186 2.185 20.61 22.3 M0499 2 187 2.185 20.79 25.7 M0499 2 188 2.185 21.11 10.55 M0499 2 189 2.185 21.3 24.43 M0499 2 190 2.185 21.68 7.93 M0499 2 191 2.185 21.88 19.44 M0499 2 192 2.185 22.10 22.51 M0499 2 193 2.185 22.5 12.44 M0499 2 194 2.185 22.77 15.52 M0499 2 195 2.185 23.17 6.46 M0499 2 196 2.185 23.55 3.14 M0499 2 197 2.185 23.83 2.51 M0499 2 198 2.185 24.06 2.2 M0499 2 199 ENDDATA 185 0 M0499 2 200 ENDSUBENT 199 0 M0499 299999 NOSUBENT M0499003 20220130 M119M0499 3 1 SUBENT M0499004 20220130 M119M0499 4 1 BIB 5 11 M0499 4 2 REACTION (3-LI-7(G,N)3-LI-6,PAR,INT/DA,,4PI/BRS) M0499 4 3 ERR-ANALYS (DATA-ERR) No information on source of uncertainties. M0499 4 4 ANALYSIS Total integrated cross section was obtained from the M0499 4 5 90-degrees differential cross sections. M0499 4 6 STATUS (DEP,M0499003) Reaction cross section. M0499 4 7 (TABLE) Data from text M0499 4 8 of Can.J.Phys.,55(1977)428. M0499 4 9 HISTORY (20130627A) Corrected by V.Varlamov: ERR-ANALYS. M0499 4 10 (20220130A) Corrected by V.Varlamov: EN-SEC, ANALYSIS, M0499 4 11 NOCOMMON, STATUS, DATA (SUBENTs 004 and 005) merged, M0499 4 12 REACTION. M0499 4 13 ENDBIB 11 0 M0499 4 14 NOCOMMON 0 0 M0499 4 15 DATA 5 2 M0499 4 16 E-LVL EN-MIN EN-MAX DATA DATA-ERR M0499 4 17 MEV MEV MEV MB*MEV MB*MEV M0499 4 18 2.185 7.3 23. 17.2 3.4 M0499 4 19 0.0 7.3 23. 38.7 3.9 M0499 4 20 ENDDATA 4 0 M0499 4 21 ENDSUBENT 20 0 M0499 499999 NOSUBENT M0499005 20220130 M119M0499 5 1 ENDENTRY 5 0 M049999999999