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