ENTRY 10795 20101022 13681079500000001 SUBENT 10795001 20101022 13681079500100001 BIB 14 36 1079500100002 INSTITUTE (1USALAS) 1079500100003 REFERENCE (C,78HARWELL,,1054,197809) 1079500100004 AUTHOR (L.R.Veeser,E.D.Arthur) 1079500100005 TITLE Measurement of (n,3n) cross sections for 235U and 238U 1079500100006 FACILITY (VDG,1USALAS) Van-de-graaff. 1079500100007 INC-SOURCE (D-T) Deuterons on tritium gas 1079500100008 INC-SPECT Neutron energy resolution due due mainly to spread in 1079500100009 deuterium energies in tritium cell. 1079500100010 DETECTOR (STANK) 75-cm diameter Gd loaded liquid scintillation 1079500100011 tank. Efficiency approximately 0.70. 1079500100012 (FISCH) fission chamber 1079500100013 (SCIN) 5-cm x 5-cm liquid scintillator to monitor 1079500100014 neutron flux. Accuracy better than +-5%. 1079500100015 MONITOR Measured gadolinium capture gamma-rays in liquid 1079500100016 scintillator and normalized data using absolute 1079500100017 differential efficiency measurements of Verbinski, 1079500100018 et al., Nucl.Instr.Meth. 65,8 (1965). 1079500100019 Detector efficiency relative to 252Cf spontaneous 1079500100020 fission prompt nu(bar) = 3.733. 1079500100021 CORRECTION Corrections made for dead times and background on all 1079500100022 runs. Sample run corrected for multiple fissions. 1079500100023 Final cross sectional values corrected for tank 1079500100024 efficiency, target mass and incident neutron flux. 1079500100025 METHOD Two series of runs made for each measurement, one with 1079500100026 large sample and one with fission chamber to subtract 1079500100027 fission neutrons. 1079500100028 ERR-ANALYS (DATA-ERR) Data errors due to: 1079500100029 .statistical uncertainties, 1079500100030 .uncertainties in corrections, 1079500100031 .uncertainties in efficiencies (+-0.01). 1079500100032 Estimated 5% error in neutron flux not included. 1079500100033 STATUS (APRVD) Approved by L.R.Veeser, 1978/12/18. 1079500100034 (TABLE) Data taken from tables in reference. 1079500100035 HISTORY (19781114C) 1079500100036 (20101022A) VM:Updated to new date formats,lower case. 1079500100037 BIB updates. 1079500100038 ENDBIB 36 0 1079500100039 NOCOMMON 0 0 1079500100040 ENDSUBENT 39 0 1079500199999 SUBENT 10795002 20101022 13681079500200001 BIB 2 2 1079500200002 REACTION (92-U-235(N,3N)92-U-233,,SIG) 1079500200003 SAMPLE 6-Cm diameter disk, 18-gms. 1079500200004 ENDBIB 2 0 1079500200005 NOCOMMON 0 0 1079500200006 DATA 4 5 1079500200007 EN EN-RSL DATA DATA-ERR 1079500200008 MEV MEV MB MB 1079500200009 14.8 0.20 87. 24. 1079500200010 17.0 0.20 206. 29. 1079500200011 19.0 0.15 258. 27. 1079500200012 20.0 0.12 265. 40. 1079500200013 21.0 0.12 277. 46. 1079500200014 ENDDATA 7 0 1079500200015 ENDSUBENT 14 0 1079500299999 SUBENT 10795003 20101022 13681079500300001 BIB 2 2 1079500300002 REACTION (92-U-235(N,4N)92-U-232,,SIG) 1079500300003 SAMPLE 6-Cm diameter disk, 18-gms. 1079500300004 ENDBIB 2 0 1079500300005 NOCOMMON 0 0 1079500300006 DATA 4 2 1079500300007 EN EN-RSL DATA DATA-ERR 1079500300008 MEV MEV MB MB 1079500300009 20.0 0.12 26. 28. 1079500300010 21.0 0.12 91. 32. 1079500300011 ENDDATA 4 0 1079500300012 ENDSUBENT 11 0 1079500399999 SUBENT 10795004 20101022 13681079500400001 BIB 2 2 1079500400002 REACTION (92-U-238(N,2N)92-U-237,,SIG) 1079500400003 SAMPLE 6-Cm diameter disk, 31-gms. 1079500400004 ENDBIB 2 0 1079500400005 NOCOMMON 0 0 1079500400006 DATA 4 5 1079500400007 EN EN-RSL DATA DATA-ERR 1079500400008 MEV MEV MB MB 1079500400009 14.7 0.15 673. 41. 1079500400010 16.0 0.20 451. 82. 1079500400011 17.0 0.20 366. 75. 1079500400012 18.0 0.15 234. 85. 1079500400013 19.0 0.15 273. 88. 1079500400014 ENDDATA 7 0 1079500400015 ENDSUBENT 14 0 1079500499999 SUBENT 10795005 20101022 13681079500500001 BIB 2 2 1079500500002 REACTION (92-U-238(N,3N)92-U-236,,SIG) 1079500500003 SAMPLE 6-Cm diameter disk, 31-gms. 1079500500004 ENDBIB 2 0 1079500500005 NOCOMMON 0 0 1079500500006 DATA 4 8 1079500500007 EN EN-RSL DATA DATA-ERR 1079500500008 MEV MEV MB MB 1079500500009 14.7 0.15 468. 40. 1079500500010 16.0 0.20 597. 62. 1079500500011 17.0 0.20 824. 62. 1079500500012 18.0 0.15 835. 62. 1079500500013 19.0 0.15 806. 61. 1079500500014 20.0 0.12 625. 39. 1079500500015 21.0 0.12 607. 62. 1079500500016 22.0 0.12 363. 80. 1079500500017 ENDDATA 10 0 1079500500018 ENDSUBENT 17 0 1079500599999 SUBENT 10795006 20101022 13681079500600001 BIB 2 2 1079500600002 REACTION (92-U-238(N,4N)92-U-235,,SIG) 1079500600003 SAMPLE 6-Cm diameter disk,31-gms. 1079500600004 ENDBIB 2 0 1079500600005 NOCOMMON 0 0 1079500600006 DATA 4 2 1079500600007 EN EN-RSL DATA DATA-ERR 1079500600008 MEV MEV MB MB 1079500600009 21.0 0.12 30. 39. 1079500600010 22.0 0.12 135. 55. 1079500600011 ENDDATA 4 0 1079500600012 ENDSUBENT 11 0 1079500699999 ENDENTRY 6 0 1079599999999