ENTRY M0499 20220130 M119M049900000001 SUBENT M0499001 20220130 M119M049900100001 BIB 13 66 M049900100002 TITLE Photoneutron cross sections in Li-7. M049900100003 AUTHOR (H.Ferdinande,N.K.Sherman,K.H.Lokan,C.K.Ross) M049900100004 REFERENCE (J,CJP,55,428,1977) M049900100005 INSTITUTE (1CANOTC) M049900100006 FACILITY (LINAC,1CANOTC) M049900100007 INC-SOURCE (BRST) M049900100008 SAMPLE 500 g cylindrical target enriched to 99.9% Li-7. The M049900100009 target was wrapped in transparent tape to protect it M049900100010 from the atmosphere. M049900100011 METHOD (TOF) Photoneutrons were detected at an angle of 90 M049900100012 degrees with respect to the photon beam by a M049900100013 conventional time-of-flight system having a flight M049900100014 path of 32 m and a resolution of 0.4 ns/m. M049900100015 DETECTOR (SCIN) M049900100016 ANALYSIS (UNFLD) The bremsstrahlung end-point energy was M049900100017 increased in 2 MeV steps from 13 to 25 MeV. At each M049900100018 energy, photoneutron T-O-F spectra were measured from M049900100019 Li-7 and from (H-2)O and (D-2)O targets. This M049900100020 provided a ratio measurement of the 90-degrees M049900100021 differential ground-state cross section for the M049900100022 Li-7(g,n0)Li-6 reaction relative to H-2(g,n) M049900100023 differential cross section. Near 14.3 MeV a M049900100024 ground-state neutron from Li-7 has the same energy M049900100025 (7 MeV) as a deuterium photoneutron (Sherman 1970). M049900100026 Each time-of-flight spectrum was converted to a M049900100027 neutron energy distribution. Using the information M049900100028 about photon spectrum these energy distributions M049900100029 were converted into cross section. At each end-point M049900100030 energy the photon spectrum was measured from the M049900100031 difference between photoneutron spectra of M049900100032 geometrically identical targets of heavy and light M049900100033 water. Because the first excited state in final M049900100034 nucleus Li-6 lies at energy 2.185 MeV those neutrons M049900100035 resulting from photons within 2.185 MeV of the M049900100036 end-point energy can only result from the M049900100037 transitions to the ground state of Li-6. Although M049900100038 the 1.377 MeV gap between the first and second M049900100039 excited states in Li-6 is less than 2 MeV end-point M049900100040 steps used an approximate first-excited-state cross M049900100041 section was extracted by substracting the M049900100042 groundstate component from the experimental M049900100043 photoneutron spectrum for each run. This component M049900100044 was obtained by folding the measured ground-state M049900100045 cross section with the fitted photon distribution, M049900100046 to obtain the ground-state neutron component for M049900100047 this end-point energy. The ground-state component M049900100048 was substracted and the residual neutron spectrum M049900100049 was converted back to a cross section by dividing by M049900100050 the calculated bremsstrahlung spectrum. M049900100051 CORRECTION Corrections were used for detector dead time and M049900100052 detector efficiency. M049900100053 COMMENT Photoneutron energy spectra from Li-7 have been M049900100054 measured by time-of-flight method, for M049900100055 bremsstrahlung end-point energies increasing in 2 M049900100056 mev steps from 13 to 25 MeV. The ground-state and M049900100057 approximate firstexcited-state differential cross M049900100058 sections at 90 degrees have been obtained from 8.5 M049900100059 to 23 MeV. No pronounced fine structure has been M049900100060 observed. The integrated cross section values for M049900100061 both cross sections were obtained also. M049900100062 HISTORY (19910218C) M049900100063 (20130627A) Corrected by V.Varlamov: REACTION, M049900100064 STATUS, dates, lowercase. M049900100065 (20220130A) Corrected by V.Varlamov: MONITOR, PART-DET,M049900100066 COMMON, STATUS, EN-SEC in SUBENTs 002 - 005, INT,,BRA M049900100067 -> INT,,BRS in REACTION of SUBENTs 004,005. M049900100068 ENDBIB 66 0 M049900100069 COMMON 1 3 M049900100070 ANG M049900100071 ADEG M049900100072 90. M049900100073 ENDCOMMON 3 0 M049900100074 ENDSUBENT 73 0 M049900199999 SUBENT M0499002 20220130 M119M049900200001 BIB 4 9 M049900200002 REACTION (3-LI-7(G,N)3-LI-6,PAR,DA,,BRS) M049900200003 ERR-ANALYS No information. M049900200004 STATUS (CURVE) Data presented on Fig. 4 M049900200005 of Can.J.Phys.,55(1977)428. M049900200006 The USA NIST digitizing. M049900200007 HISTORY (20130627A) Corrected by V.Varlamov: BRA -> BRS, M049900200008 ERR-ANALYS. M049900200009 (20220130A) Corrected by V.Varlamov: EN-SEC, COMMON, M049900200010 DATA (SUBENTs 002 and 003 merged), STATUS. M049900200011 ENDBIB 9 0 M049900200012 NOCOMMON 0 0 M049900200013 DATA 3 183 M049900200014 E-LVL EN DATA M049900200015 MEV MEV MU-B/SR M049900200016 0.0 8.4 1.54 M049900200017 0.0 8.63 2.93 M049900200018 0.0 8.64 .21 M049900200019 0.0 8.77 1.93 M049900200020 0.0 8.85 7.04 M049900200021 0.0 8.95 5.7 M049900200022 0.0 9.13 7.42 M049900200023 0.0 9.27 8.8 M049900200024 0.0 9.36 9.83 M049900200025 0.0 9.45 10.18 M049900200026 0.0 9.6 7.48 M049900200027 0.0 9.73 10.56 M049900200028 0.0 9.87 12.96 M049900200029 0.0 9.9 18.4 M049900200030 0.0 10.06 26.93 M049900200031 0.0 10.16 25.92 M049900200032 0.0 10.3 24.92 M049900200033 0.0 10.35 26.97 M049900200034 0.0 10.44 27.66 M049900200035 0.0 10.53 28.69 M049900200036 0.0 10.63 25.64 M049900200037 0.0 10.76 28.72 M049900200038 0.0 10.9 29.08 M049900200039 0.0 11.04 27.4 M049900200040 0.0 11.17 31.83 M049900200041 0.0 11.31 34.57 M049900200042 0.0 11.4 35.27 M049900200043 0.0 11.54 33.92 M049900200044 0.0 11.59 35.29 M049900200045 0.0 11.68 36.66 M049900200046 0.0 11.69 35.3 M049900200047 0.0 11.87 33.97 M049900200048 0.0 11.91 35.33 M049900200049 0.0 12.09 37.74 M049900200050 0.0 12.19 35.71 M049900200051 0.0 12.29 36.06 M049900200052 0.0 12.38 36.41 M049900200053 0.0 12.61 37.8 M049900200054 0.0 12.7 36.46 M049900200055 0.0 12.84 37.15 M049900200056 0.0 12.94 37.51 M049900200057 0.0 13.03 38.54 M049900200058 0.0 13.11 41.95 M049900200059 0.0 13.26 39.59 M049900200060 0.0 13.35 41.30 M049900200061 0.0 13.58 42.01 M049900200062 0.0 13.72 40.67 M049900200063 0.0 13.86 42.39 M049900200064 0.0 13.95 43.42 M049900200065 0.0 14.08 47.52 M049900200066 0.0 14.22 47.88 M049900200067 0.0 14.37 45.17 M049900200068 0.0 14.45 48.25 M049900200069 0.0 14.6 45.55 M049900200070 0.0 14.73 47.94 M049900200071 0.0 14.83 45.24 M049900200072 0.0 14.97 45.93 M049900200073 0.0 14.98 44.23 M049900200074 0.0 15.22 40.86 M049900200075 0.0 15.3 45.98 M049900200076 0.0 15.31 42.92 M049900200077 0.0 15.43 49.39 M049900200078 0.0 15.62 47.72 M049900200079 0.0 15.81 48.42 M049900200080 0.0 15.9 49.8 M049900200081 0.0 15.96 44.7 M049900200082 0.0 16.04 49.13 M049900200083 0.0 16.1 42.34 M049900200084 0.0 16.19 44.05 M049900200085 0.0 16.28 46.1 M049900200086 0.0 16.38 42.72 M049900200087 0.0 16.42 45.78 M049900200088 0.0 16.57 42.4 M049900200089 0.0 16.67 40.71 M049900200090 0.0 16.81 38.69 M049900200091 0.0 16.95 41.09 M049900200092 0.0 16.99 43.81 M049900200093 0.0 17.13 41.79 M049900200094 0.0 17.14 40.09 M049900200095 0.0 17.32 41.48 M049900200096 0.0 17.47 38.09 M049900200097 0.0 17.56 39.47 M049900200098 0.0 17.6 40.49 M049900200099 0.0 17.75 38.47 M049900200100 0.0 17.89 36.79 M049900200101 0.0 17.96 46.32 M049900200102 0.0 18.11 44.64 M049900200103 0.0 18.19 48.05 M049900200104 0.0 18.34 43.99 M049900200105 0.0 18.44 41.62 M049900200106 0.0 18.68 40.29 M049900200107 0.0 18.71 45.74 M049900200108 0.0 18.79 49.83 M049900200109 0.0 18.95 43.39 M049900200110 0.0 19.14 43.41 M049900200111 0.0 19.17 46.82 M049900200112 0.0 19.33 42.42 M049900200113 0.0 19.52 41.42 M049900200114 0.0 19.69 44.51 M049900200115 0.0 19.85 39.08 M049900200116 0.0 19.97 45.22 M049900200117 0.0 20.03 42.51 M049900200118 0.0 20.12 44.56 M049900200119 0.0 20.3 45.27 M049900200120 0.0 20.45 41.88 M049900200121 0.0 20.6 37.48 M049900200122 0.0 20.81 44.99 M049900200123 0.0 20.91 43.64 M049900200124 0.0 21.14 47.75 M049900200125 0.0 21.36 51.78 M049900200126 0.0 21.5 52.22 M049900200127 0.0 21.7 44.77 M049900200128 0.0 21.93 45.82 M049900200129 0.0 22.07 48.22 M049900200130 0.0 22.2 52.65 M049900200131 0.0 22.46 42.82 M049900200132 0.0 22.68 45.91 M049900200133 0.0 22.78 43.55 M049900200134 0.0 23.06 42.9 M049900200135 0.0 23.48 44.32 M049900200136 0.0 23.81 43.34 M049900200137 0.0 23.91 40.97 M049900200138 0.0 24.1 38.28 M049900200139 0.0 24.12 37.94 M049900200140 0.0 24.29 40. M049900200141 0.0 24.37 45.11 M049900200142 0.0 24.62 38. M049900200143 0.0 24.85 36.67 M049900200144 0.0 25.03 42.48 M049900200145 0.0 25.21 42.84 M049900200146 0.0 25.39 48.31 M049900200147 2.185 10.41 10.64 M049900200148 2.185 10.7 24.54 M049900200149 2.185 10.79 24.89 M049900200150 2.185 11.02 26.27 M049900200151 2.185 11.3 25.64 M049900200152 2.185 11.61 30.75 M049900200153 2.185 12.3 32.55 M049900200154 2.185 12.63 30.91 M049900200155 2.185 12.87 31.28 M049900200156 2.185 13.24 31.67 M049900200157 2.185 13.58 24.29 M049900200158 2.185 13.88 18.93 M049900200159 2.185 14.22 11.89 M049900200160 2.185 14.46 9.89 M049900200161 2.185 14.69 9.93 M049900200162 2.185 14.93 9.96 M049900200163 2.185 15.06 9.98 M049900200164 2.185 15.38 14.76 M049900200165 2.185 15.56 15.13 M049900200166 2.185 15.71 13.46 M049900200167 2.185 16.03 15.19 M049900200168 2.185 16.17 14.88 M049900200169 2.185 16.4 13.9 M049900200170 2.185 16.67 19.34 M049900200171 2.185 16.87 14.64 M049900200172 2.185 17.05 14.33 M049900200173 2.185 17.35 9.31 M049900200174 2.185 17.6 18.47 M049900200175 2.185 17.98 14.13 M049900200176 2.185 18.25 17.22 M049900200177 2.185 18.57 19.97 M049900200178 2.185 18.79 24.39 M049900200179 2.185 18.98 24.42 M049900200180 2.185 19.19 14.99 M049900200181 2.185 19.57 13.02 M049900200182 2.185 19.75 14.74 M049900200183 2.185 20.04 26.6 M049900200184 2.185 20.23 25.96 M049900200185 2.185 20.43 21.59 M049900200186 2.185 20.61 22.3 M049900200187 2.185 20.79 25.7 M049900200188 2.185 21.11 10.55 M049900200189 2.185 21.3 24.43 M049900200190 2.185 21.68 7.93 M049900200191 2.185 21.88 19.44 M049900200192 2.185 22.10 22.51 M049900200193 2.185 22.5 12.44 M049900200194 2.185 22.77 15.52 M049900200195 2.185 23.17 6.46 M049900200196 2.185 23.55 3.14 M049900200197 2.185 23.83 2.51 M049900200198 2.185 24.06 2.2 M049900200199 ENDDATA 185 0 M049900200200 ENDSUBENT 199 0 M049900299999 NOSUBENT M0499003 20220130 M119M049900300001 SUBENT M0499004 20220130 M119M049900400001 BIB 5 11 M049900400002 REACTION (3-LI-7(G,N)3-LI-6,PAR,INT/DA,,4PI/BRS) M049900400003 ERR-ANALYS (DATA-ERR) No information on source of uncertainties. M049900400004 ANALYSIS Total integrated cross section was obtained from the M049900400005 90-degrees differential cross sections. M049900400006 STATUS (DEP,M0499003) Reaction cross section. M049900400007 (TABLE) Data from text M049900400008 of Can.J.Phys.,55(1977)428. M049900400009 HISTORY (20130627A) Corrected by V.Varlamov: ERR-ANALYS. M049900400010 (20220130A) Corrected by V.Varlamov: EN-SEC, ANALYSIS, M049900400011 NOCOMMON, STATUS, DATA (SUBENTs 004 and 005) merged, M049900400012 REACTION. M049900400013 ENDBIB 11 0 M049900400014 NOCOMMON 0 0 M049900400015 DATA 5 2 M049900400016 E-LVL EN-MIN EN-MAX DATA DATA-ERR M049900400017 MEV MEV MEV MB*MEV MB*MEV M049900400018 2.185 7.3 23. 17.2 3.4 M049900400019 0.0 7.3 23. 38.7 3.9 M049900400020 ENDDATA 4 0 M049900400021 ENDSUBENT 20 0 M049900499999 NOSUBENT M0499005 20220130 M119M049900500001 ENDENTRY 5 0 M049999999999