ENTRY 10253 20170724 14321025300000001 SUBENT 10253001 20170724 14321025300100001 BIB 14 32 1025300100002 TITLE Additional measurements of the ratio of the fission 1025300100003 cross sections of plutonium-239 and uranium-235 1025300100004 AUTHOR (W.P.Poenitz) 1025300100005 INSTITUTE (1USAANL) 1025300100006 REFERENCE (J,NSE,47,228,1972) 1025300100007 FACILITY (DYNAM) 8-MeV tandem dynamitron 1025300100008 INC-SOURCE (P-LI7) 1025300100009 INC-SPECT (EN-RSL-HW) Neutron energy spreads of 50 to 150 keV 1025300100010 (FWHM) 1025300100011 SAMPLE Samples electroplated on 0.025 cm Mo backings. 1025300100012 U samples (~35 ug/cm2 thick) with isotopic composition:1025300100013 235U(99.856%),236U(0.062%),238U(0.054%),234U(0.028%). 1025300100014 Pu samples (~45 ug/cm2 thick) with isotopic composition1025300100015 239Pu(98.843%),241Pu(0.049%),240Pu(1.007%). 1025300100016 METHOD (TOF) for background suppression. Overall time 1025300100017 resolution of ~4 ns. 1025300100018 DETECTOR (FISCH) Back-to-back gas scintillation fission 1025300100019 chambers. Effects due to scattering in backing and to 1025300100020 fragment momenta eliminated by reversing chambers. 1025300100021 CORRECTION Corrected for: 1025300100022 - second source neutron group, 1025300100023 - inelastic scattering in backing and fission counter,1025300100024 - in-scattering of lower energy neutrons from backing,1025300100025 - fissions from trace isotopes. 1025300100026 ERR-ANALYS (ERR-S) Statistical error 1025300100027 (ERR-1) Absolute error including 2.5% uncertainty 1025300100028 in the mass ratio 1025300100029 STATUS (APRVD) Approved by author 1025300100030 HISTORY (19720809C) 1025300100031 (19821118U) Converted to REACTION formalism. 1025300100032 (20011130A) Converted to new date formats, lower case. 1025300100033 (20170724A) On. ERR-ANALYS updated. Major rev. in 002. 1025300100034 ENDBIB 32 0 1025300100035 NOCOMMON 0 0 1025300100036 ENDSUBENT 35 0 1025300199999 SUBENT 10253002 20170724 14321025300200001 BIB 3 3 1025300200002 REACTION ((94-PU-239(N,F),,SIG)/(92-U-235(N,F),,SIG)) 1025300200003 STATUS (TABLE) Table I of Nucl.Sci.Eng.47(1972)228 1025300200004 HISTORY (20170724A) On. EN-RSL -> EN-RSL-HW, DATA-ERR -> ERR-1 1025300200005 ENDBIB 3 0 1025300200006 NOCOMMON 0 0 1025300200007 DATA 5 27 1025300200008 EN EN-RSL-HW DATA ERR-S ERR-1 1025300200009 MEV KEV NO-DIM NO-DIM NO-DIM 1025300200010 0.03 7. 0.796 0.008 0.02 1025300200011 0.50 25. 1.36 0.02 0.04 1025300200012 0.70 25. 1.41 0.02 0.04 1025300200013 0.80 25. 1.51 0.03 0.05 1025300200014 0.90 25. 1.45 0.02 0.04 1025300200015 0.95 25. 1.42 0.02 0.04 1025300200016 1.00 25. 1.39 0.02 0.04 1025300200017 1.05 25. 1.44 0.02 0.04 1025300200018 1.10 25. 1.47 0.03 0.04 1025300200019 1.15 25. 1.49 0.03 0.05 1025300200020 1.20 25. 1.54 0.03 0.05 1025300200021 1.25 25. 1.51 0.03 0.05 1025300200022 1.30 25. 1.58 0.03 0.05 1025300200023 1.35 25. 1.59 0.03 0.05 1025300200024 1.40 25. 1.59 0.06 0.07 1025300200025 1.50 25. 1.61 0.03 0.05 1025300200026 1.60 50. 1.59 0.03 0.05 1025300200027 1.80 50. 1.55 0.03 0.05 1025300200028 2.00 50. 1.56 0.03 0.05 1025300200029 2.40 50. 1.52 0.03 0.05 1025300200030 2.50 50. 1.52 0.03 0.05 1025300200031 3.00 75. 1.48 0.03 0.05 1025300200032 3.50 75. 1.59 0.03 0.05 1025300200033 4.00 75. 1.61 0.03 0.05 1025300200034 4.50 75. 1.62 0.03 0.05 1025300200035 5.00 75. 1.58 0.04 0.06 1025300200036 5.49 75. 1.57 0.04 0.06 1025300200037 ENDDATA 29 0 1025300200038 ENDSUBENT 37 0 1025300299999 ENDENTRY 2 0 1025399999999