ENTRY 21669 20170124 22592166900000001 SUBENT 21669001 20170124 22592166900100001 BIB 13 104 2166900100002 INSTITUTE (2FR BRC) 2166900100003 REFERENCE (P,NEANDC(E)-194,66,1978) Abstract. 2166900100004 Initial publication 2166900100005 (W,FREHAUT,19800924) Reply to data request. 2166900100006 See STATUS in Subent 002 . 2166900100007 (R,CEA-R-6447,201611) Revised data . 2166900100008 AUTHOR (J.Frehaut) 2166900100009 TITLE -The C-13(n,2n) cross section -. 2166900100010 REL-REF (M,,J.Frehaut+,J,NIM,135,511,1976) 2166900100011 (I,21568001,J.Frehaut+,J,NSE,74,29,1980) 2166900100012 Two refs. for setup, method, corrections details 2166900100013 (O,21568001,J.Frehaut,R,CEA-R-6447,201611) 2166900100014 U-235, U-238 (n,2n) cross section 2166900100015 (O,21971004,J.Frehaut,R,CEA-R-6447,201611) 2166900100016 H-2 n,2n cross section 2166900100017 (O,20416001,J.Frehaut,R,CEA-R-6447,201611) 2166900100018 Lot of other n,2n cross-sections . 2166900100019 FACILITY (VDG) Van de Graaff. 2166900100020 INC-SOURCE (D-D) Deuterium beam on deuterium target. 2166900100021 SAMPLE .No details. 2166900100022 METHOD (ASSOP) Detection of emitted neutrons. 2166900100023 DETECTOR (SCIN ) Large liquid scintillator. 2166900100024 Neutron detection efficiency as function of energy: 2166900100025 En,MeV Efficiency smoothed,% Efficiency ,% 2166900100026 0.25 80.00 79.90 2166900100027 0.50 79.80 77.90 2166900100028 0.75 79.60 79.20 2166900100029 1.00 79.30 80.70 2166900100030 1.25 78.90 79.30 2166900100031 1.50 78.40 79.30 2166900100032 1.75 77.70 77.10 2166900100033 2.00 76.90 77.20 2166900100034 2.25 75.90 73.10 2166900100035 2.50 74.90 71.90 2166900100036 2.75 73.80 75.70 2166900100037 3.00 72.70 74.30 2166900100038 3.25 71.40 71.80 2166900100039 3.50 70.30 70.10 2166900100040 3.75 69.30 70.40 2166900100041 4.00 68.40 68.50 2166900100042 4.25 67.40 70.20 2166900100043 4.50 66.40 66.60 2166900100044 4.75 65.40 63.20 2166900100045 5.00 64.60 64.60 2166900100046 5.25 63.70 64.80 2166900100047 5.50 62.90 61.70 2166900100048 5.75 62.10 63.20 2166900100049 6.00 61.30 60.60 2166900100050 6.25 60.60 61.40 2166900100051 6.50 59.90 59.20 2166900100052 6.75 59.30 56.00 2166900100053 7.00 58.80 56.40 2166900100054 7.25 58.20 57.70 2166900100055 7.50 57.50 59.20 2166900100056 7.75 56.80 58.20 2166900100057 8.00 56.00 56.90 2166900100058 8.25 55.20 56.50 2166900100059 8.50 54.20 51.00 2166900100060 8.75 53.30 51.00 2166900100061 9.00 52.30 53.90 2166900100062 9.25 51.30 51.00 2166900100063 9.50 50.20 49.80 2166900100064 9.75 49.90 50.30 2166900100065 10.00 49.50 49.90 2166900100066 ASSUMED (ASSUM,98-CF-252(0,F),,NU) Spontaneous fission used for2166900100067 detector efficiency calibration. 2166900100068 And Maxwellian spectrum temperature 1.43 MeV. 2166900100069 MONITOR (92-U-235(N,F),,SIG) MONIT-REFs in data Subents. 2166900100070 Sowerby Standard2007 Ratio 2166900100071 En,MeV Cross-section,barn No-dim.2166900100072 1. 0.0121 0.01355 1.1240 2166900100073 1.2 0.0393 0.0336 0.8555 2166900100074 1.4 0.129 0.1912 1.4806 2166900100075 1.6 0.372 0.4233 1.1379 2166900100076 1.8 0.487 0.4839 0.9938 2166900100077 2. 0.522 0.5340 1.0230 2166900100078 2.2 0.525 0.5471 1.0421 2166900100079 2.4 0.515 0.5463 1.0608 2166900100080 2.6 0.507 0.5411 1.0673 2166900100081 2.8 0.503 0.5372 1.0680 2166900100082 3. 0.502 0.5237 1.0432 2166900100083 3.5 0.506 0.5430 1.0731 2166900100084 4. 0.512 0.5544 1.0828 2166900100085 4.5 0.513 0.5593 1.0903 2166900100086 5. 0.514 0.5467 1.0636 2166900100087 5.5 0.54 0.5463 1.0117 2166900100088 6. 0.613 0.6108 0.9964 2166900100089 6.5 0.753 0.8158 1.0834 2166900100090 7. 0.874 0.9387 1.0740 2166900100091 8. 0.956 1.0111 1.0576 2166900100092 9. 0.963 1.0094 1.0482 2166900100093 10. 0.952 1.0013 1.0518 2166900100094 11. 0.954 1.0019 1.0502 2166900100095 12. 0.966 0.9850 1.0197 2166900100096 13. 1.008 1.0151 1.0070 2166900100097 14. 1.126 1.1434 1.0155 2166900100098 15. 1.238 1.2346 0.9973 2166900100099 HISTORY (19801016C) 2166900100100 (19801104E) 2166900100101 (20170124A) M.M. Upper -> lower case correction. 2166900100102 Dates were corrected for 4-digits year. 2166900100103 REL-REFs were added. 2166900100104 New ref. R,CEA-R-6447 was added. 2166900100105 Subent 003 was added. 2166900100106 ENDBIB 104 0 2166900100107 COMMON 1 3 2166900100108 ASSUM 2166900100109 PRT/FIS 2166900100110 3.732 2166900100111 ENDCOMMON 3 0 2166900100112 ENDSUBENT 111 0 2166900199999 SUBENT 21669002 20170124 22592166900200001 BIB 5 18 2166900200002 REACTION (6-C-13(N,2N)6-C-12,,SIG) Cross section. 2166900200003 MONIT-REF (,M.G.Sowerby+,R,AERE-R-72/73,1973) 2166900200004 STATUS (UNOBT) Because of the large uncertainties associated 2166900200005 with the neutron efficiency correction, the author 2166900200006 does not wish to issue numerical data. The graph in 2166900200007 NEANDC(E)-194 should be considered only as a 2166900200008 qualitative illustration of the cross section 2166900200009 excitation function. 2166900200010 CORRECTION .No correction was made in detector efficiency for 2166900200011 the difference between the spontaneous fis. spectrum 2166900200012 and the c-13(n,2n) neutron emission spectrum. There 2166900200013 is certainly a large difference but as the C-13 2166900200014 Neutron spectrum is unknown and the correction could 2166900200015 be as large as 50 percent and could depend on the 2166900200016 incident energy the measurement is not considered 2166900200017 as quantitatively reliable. 2166900200018 HISTORY (19801016C) 2166900200019 (19801104E) 2166900200020 ENDBIB 18 0 2166900200021 COMMON 2 3 2166900200022 EN-MIN EN-MAX 2166900200023 MEV MEV 2166900200024 5. 14. 2166900200025 ENDCOMMON 3 0 2166900200026 NODATA 0 0 2166900200027 ENDSUBENT 26 0 2166900299999 SUBENT 21669003 20170124 22592166900300001 BIB 6 20 2166900300002 REACTION (6-C-13(N,2N)6-C-12,,SIG) Cross section. 2166900300003 MONIT-REF (,,R,STI/PUB-1291,2007) 2166900300004 International Evaluation of neutron cross-section 2166900300005 Standards. IAEA,Vienna, 2007. 2166900300006 CORRECTION Background correction. 2166900300007 For dead time losses. 2166900300008 Efficiency correction. 2166900300009 Multiple event correction. 2166900300010 For events not induced in sample. 2166900300011 For (n,2n) reactions induced by non-monoenergetic 2166900300012 neutrons. 2166900300013 Correction in the flux measurement. 2166900300014 For the effect of (n,2n) reaction in the axial tube 2166900300015 of scintillator tank - estimated to be negligible. 2166900300016 For reactions induced by degradated neutrons ( -3%) 2166900300017 and loss of secondary neutrons in sample ( +0.5%) . 2166900300018 ERR-ANALYS (DATA-ERR) Type of error is not explained in the 2166900300019 article. 2166900300020 STATUS (TABLE) Table 22 of R,CEA-R-6447,201611 2166900300021 HISTORY (20170124C) M.M. Subent was added 2166900300022 ENDBIB 20 0 2166900300023 NOCOMMON 0 0 2166900300024 DATA 4 16 2166900300025 EN EN-ERR DATA DATA-ERR 2166900300026 MEV MEV MB MB 2166900300027 7.41 0.165 10. 10. 2166900300028 7.93 0.150 19. 8. 2166900300029 8.18 0.145 90. 12. 2166900300030 8.44 0.135 114. 10. 2166900300031 8.94 0.125 90. 12. 2166900300032 9.44 0.115 99. 8. 2166900300033 10.42 0.100 115. 10. 2166900300034 10.91 0.095 196. 13. 2166900300035 11.40 0.090 218. 13. 2166900300036 11.88 0.085 209. 15. 2166900300037 12.36 0.085 204. 16. 2166900300038 12.85 0.080 220. 18. 2166900300039 13.33 0.075 298. 23. 2166900300040 13.80 0.075 289. 31. 2166900300041 14.28 0.070 255. 25. 2166900300042 14.76 0.065 221. 28. 2166900300043 ENDDATA 18 0 2166900300044 ENDSUBENT 43 0 2166900399999 ENDENTRY 3 0 2166999999999