ENTRY 12415 20220304 14981241500000001 SUBENT 12415001 20220304 14981241500100001 BIB 13 45 1241500100002 TITLE Fission Cross Section of U235 for Fast Neutrons 1241500100003 AUTHOR (B.C.Diven) 1241500100004 REFERENCE (J,PR,105,1350,1957) 1241500100005 #doi:10.1103/PhysRev.105.1350 1241500100006 (R,LA-1336,1953) Preliminary results. 1241500100007 INSTITUTE (1USALAS) 1241500100008 FACILITY (ACCEL,1USALAS) 2.5-MeV electrostatic accelerator. 1241500100009 INC-SOURCE (P-T) Monoenergetic neutrons produced in a tritium 1241500100010 target by protons from electrostatic accelerator. 1241500100011 DETECTOR (PROPC,FISCH) Double counter including proportional 1241500100012 counter for proton recoils and ionization chamber for 1241500100013 detection of fissions. 1241500100014 SAMPLE The U235 foils consisted of 200 to 500 microg of U235 1241500100015 coated onto a 2.6-cm-diameter circle on a 1241500100016 0.013-cm-thick disk of platinum. 1241500100017 METHOD (REC) The U235 fission cross section was measured 1241500100018 with about 80 keV resolution from 400 to 1.600 keV by 1241500100019 comparison with the n,p scattering cross section. 1241500100020 ERR-ANALYS (DATA-ERR) Standard deviation (root-mean-square 1241500100021 value) of about 3.5%. 1241500100022 (ERR-1) Extrapolation of recoil-proton pulse-height 1241500100023 distribution. 1241500100024 (ERR-2) Glycerol-tristearate weight and fitting of 1241500100025 observed experimental recoil-proton curves. 1241500100026 (ERR-3) Uranium foil thickness correction. 1241500100027 (ERR-4) Weight of 235U. Smaller errors considered: 1241500100028 Glycerol-tristearate thickness correction 0.5%, room 1241500100029 background neutrons 0.2%, counter scattering 0.4%, 1241500100030 foil scattering 0.3%, c.m. motion of fission 1241500100031 fragments 0.1%, target scattering 0.1%, hydrogen 1241500100032 contamination of counter 0.5%, hydrogen content of 1241500100033 glycerol-tristearate 0.5%. 1241500100034 CORRECTION Glycerol-tristearate thickness 5%, uranium foil 1241500100035 thickness 1.8%, room background of neutrons 1.3%, 1241500100036 counter scattering 1.3%, foil scattering 0.5%, c.m. 1241500100037 motion of fission fragments 0.6%, target scattering 1241500100038 0.2%, hydrogen contamination of counter 4.0%. 1241500100039 MONITOR (1-H-1(N,EL)1-H-1,,SIG) normalized at 1.272 MeV to n-p 1241500100040 scattering. 1241500100041 HISTORY (19760804T) Translated from SCISRS. 1241500100042 (19820519A) Converted to reaction formalism. 1241500100043 (20220304A) BP: Updated to new date formats, lower 1241500100044 case. corrections according last EXFOR rules and 1241500100045 Dict. Added doi, LA report, facility, method, sample, 1241500100046 incoming source, error analysis and corrections. 1241500100047 ENDBIB 45 0 1241500100048 COMMON 4 3 1241500100049 ERR-1 ERR-2 ERR-3 ERR-4 1241500100050 PER-CENT PER-CENT PER-CENT PER-CENT 1241500100051 2.6 1.5 1.1 1.0 1241500100052 ENDCOMMON 3 0 1241500100053 ENDSUBENT 52 0 1241500199999 SUBENT 12415002 20220304 14981241500200001 BIB 2 2 1241500200002 REACTION (92-U-235(N,F),,SIG) 1241500200003 STATUS (TABLE) Table I, page 1352 of Phys.Rev.105,1350,1957. 1241500200004 ENDBIB 2 0 1241500200005 NOCOMMON 0 0 1241500200006 DATA 5 14 1241500200007 EN EN-RSL DATA DATA-ERR MONIT 1241500200008 MEV MEV B B B 1241500200009 4.03E-01 3.9E-02 1.28 8.E-02 6.886 1241500200010 5.13E-01 3.9E-02 1.24 7.E-02 6.060 1241500200011 5.62E-01 3.9E-02 1.27 7.E-02 5.778 1241500200012 6.73E-01 4.1E-02 1.17 6.E-02 5.272 1241500200013 7.70E-01 4.0E-02 1.19 6.E-02 4.906 1241500200014 8.65E-01 3.9E-02 1.23 6.E-02 4.601 1241500200015 9.44E-01 3.9E-02 1.27 5.E-02 4.391 1241500200016 1.025 3.9E-02 1.26 5.E-02 4.200 1241500200017 1.095 3.9E-02 1.27 4.E-02 4.053 1241500200018 1.171 3.7E-02 1.27 4.E-02 3.980 1241500200019 1.272 3.5E-02 1.27 4.4E-02 3.737 1241500200020 1.424 3.5E-02 1.27 4.E-02 3.514 1241500200021 1.545 3.2E-02 1.30 5.E-02 3.306 1241500200022 1.620 3.0E-02 1.31 5.E-02 3.271 1241500200023 ENDDATA 16 0 1241500200024 ENDSUBENT 23 0 1241500299999 ENDENTRY 2 0 1241599999999