ENTRY 10759 20091113 13601075900000001 SUBENT 10759001 20091113 13601075900100001 BIB 10 26 1075900100002 INSTITUTE (1USAORL) 1075900100003 REFERENCE (R,ORNL-TM-6246,197805) 1075900100004 AUTHOR (R.Gwin,R.R.Spencer,R.W.Ingle,J.H.Todd,H.Weaver) 1075900100005 TITLE Measurements of the Average Number of Prompt Neutrons 1075900100006 Emitted per Fission of 239Pu and 235U. 1075900100007 FACILITY (LINAC,1USAORL) Oak Ridge Electron Linear Accelerator 1075900100008 SAMPLE The fissile isotopes were deposited on aluminum discs 1075900100009 to a surface density of 1+-0.3 gram/m. 1075900100010 DETECTOR (SCIN) Gadolinium-loaded liquid scintillator 1075900100011 (with an efficiency of about 83%) used to detect 1075900100012 fission neutrons. 1075900100013 (FISCH) Fission chamber (efficiency 95%) used to 1075900100014 define fission events. 1075900100015 CORRECTION Corrected for: 1075900100016 . false fissions, 1075900100017 . displacement of fission samples from center of 1075900100018 liquid scintillator, 1075900100019 . backgrounds in the neutron detector, 1075900100020 . pulse pile up, 1075900100021 . fission spectrum differences. 1075900100022 STATUS (APRVD) Approved by R. Gwin, 1984/3/2. 1075900100023 HISTORY (19780801C) 1075900100024 (19830829U) BIB corrections 1075900100025 (19841024A) subentries 2 and 3 moved to an 12906. 1075900100026 (20091113A) VM:Updated to new date formats,lower case. 1075900100027 BIB updates. 1075900100028 ENDBIB 26 0 1075900100029 NOCOMMON 0 0 1075900100030 ENDSUBENT 29 0 1075900199999 NOSUBENT 10759002 19841024 00001075900200001 NOSUBENT 10759003 19841024 00001075900300001 SUBENT 10759004 20091113 13601075900400001 BIB 5 7 1075900400002 REACTION ((94-PU-239(N,F),PR,NU)/(98-CF-252(0,F),PR,NU)) 1075900400003 METHOD (TOF). 21.6-m flight path. 1075900400004 ERR-ANALYS (DATA-ERR) Uncertainties include statistical errors and1075900400005 a 0.25% uncertainty due to discrepant results from 1075900400006 the two 252Cf fission chambers. 1075900400007 STATUS (TABLE) Data taken from table in report. 1075900400008 HISTORY (19840305A) Bib update. 1075900400009 ENDBIB 7 0 1075900400010 NOCOMMON 0 0 1075900400011 DATA 4 43 1075900400012 EN-MIN EN-MAX DATA DATA-ERR 1075900400013 KEV KEV NO-DIM NO-DIM 1075900400014 0.050 0.100 0.7701 0.0021 1075900400015 0.10 0.20 0.7750 0.0038 1075900400016 0.20 0.30 0.7716 0.0040 1075900400017 0.30 0.40 0.7650 0.0050 1075900400018 0.40 0.50 0.7668 0.0044 1075900400019 0.51 0.61 0.7631 0.0039 1075900400020 0.61 0.71 0.7585 0.0098 1075900400021 0.71 0.80 0.7841 0.0086 1075900400022 0.80 0.90 0.7734 0.0078 1075900400023 0.90 1.00 0.7662 0.0071 1075900400024 1.0 2.0 0.7690 0.0035 1075900400025 2.0 3.0 0.7848 0.0110 1075900400026 3.0 4.0 0.7676 0.0080 1075900400027 4.0 5.0 0.7661 0.0109 1075900400028 5.0 6.0 0.7577 0.0131 1075900400029 6.0 7.0 0.7490 0.0108 1075900400030 7.0 8.0 0.7669 0.0055 1075900400031 8.0 9.0 0.7582 0.0159 1075900400032 9.0 10.0 0.7593 0.0167 1075900400033 10.0 20.0 0.7711 0.0063 1075900400034 20.0 30.0 0.7715 0.0082 1075900400035 30.0 40.0 0.7598 0.0138 1075900400036 40. 50. 0.7609 0.0081 1075900400037 50. 60. 0.7675 0.0069 1075900400038 60. 74. 0.7665 0.0070 1075900400039 74. 85. 0.7522 0.0092 1075900400040 85. 94. 0.7565 0.0191 1075900400041 94. 100. 0.7654 0.0189 1075900400042 100. 200. 0.7793 0.0045 1075900400043 200. 300. 0.7746 0.0043 1075900400044 300. 400. 0.7764 0.0042 1075900400045 400. 500. 0.7870 0.0043 1075900400046 500. 600. 0.7892 0.0046 1075900400047 600. 710. 0.7903 0.0047 1075900400048 710. 800. 0.7936 0.0048 1075900400049 800. 920. 0.7944 0.0049 1075900400050 920. 1000. 0.8012 0.0051 1075900400051 1000. 2100. 0.8179 0.0024 1075900400052 2100. 3100. 0.8575 0.0041 1075900400053 3100. 4100. 0.8994 0.0054 1075900400054 4100. 5100. 0.9376 0.0070 1075900400055 5100. 6400. 0.9812 0.0077 1075900400056 6400. 7200. 1.0226 0.0080 1075900400057 ENDDATA 45 0 1075900400058 ENDSUBENT 57 0 1075900499999 SUBENT 10759005 20091113 13601075900500001 BIB 4 6 1075900500002 REACTION ((92-U-235(N,F),PR,NU)/(98-CF-252(0,F),PR,NU)) 1075900500003 METHOD (TOF). 21.6-M flight path. 1075900500004 STATUS (SPSDD) Authors suggest that these data not be used 1075900500005 because of problems in background. 1075900500006 HISTORY (19801210U) Status change. 1075900500007 (19840305A) Bib update. 1075900500008 ENDBIB 6 0 1075900500009 NOCOMMON 0 0 1075900500010 NODATA 0 0 1075900500011 ENDSUBENT 10 0 1075900599999 SUBENT 10759006 20091113 13601075900600001 BIB 3 4 1075900600002 REACTION ((94-PU-239(N,F),PR,NU)/(98-CF-252(0,F),PR,NU)) 1075900600003 STATUS (SPSDD,13101004) 1075900600004 HISTORY (19840305A) Bib update. 1075900600005 (19870122A) Data superseded. 1075900600006 ENDBIB 4 0 1075900600007 NOCOMMON 0 0 1075900600008 NODATA 0 0 1075900600009 ENDSUBENT 8 0 1075900699999 ENDENTRY 6 0 1075999999999