ENTRY 14728 20220117 14951472800000001 SUBENT 14728001 20220117 14951472800100001 BIB 7 9 1472800100002 TITLE Fission cross section of 25 for 0.01 to 1000 eV 1472800100003 neutrons 1472800100004 AUTHOR (E.E.Anderson,L.S.Lavatelli,B.D.McDaniel,R.B.Sutton) 1472800100005 REFERENCE (R,LA-82,1944) 1472800100006 INSTITUTE (1USALAS) 1472800100007 FACILITY (CYCLO,1USALAS) 1472800100008 DETECTOR (BF3,FISCH) Two BF3 chambers were used as detectors, 1472800100009 25 fission chamber. 1472800100010 HISTORY (20220117C) BP 1472800100011 ENDBIB 9 0 1472800100012 NOCOMMON 0 0 1472800100013 ENDSUBENT 12 0 1472800199999 SUBENT 14728002 20220117 14951472800200001 BIB 6 16 1472800200002 REACTION ((92-U-235(N,F),,SIG)/(5-B-10(N,A)3-LI-7,,SIG)) 1472800200003 REL-REF (M,14724001,C.L.Bailey+,R,LA-46,1944) Boron absorption 1472800200004 method results. 1472800200005 SAMPLE The 25 chamber: Enriched uranium oxide, for which the 1472800200006 ratio of 235U to 238U was about 1 to 8, was sprayed 1472800200007 onto each side of the foils to the thickness of 1 mg 1472800200008 per cm2 of uranium. There was a total of 7.74 gm of 1472800200009 uranium in a chamber, of which about 0.89 gram was 1472800200010 235U. 1472800200011 METHOD (TOF) Hydrogenous material was used to reduce the 1472800200012 energy of neutrons to the region below 1000 eV. A 1472800200013 slow neutron velocity spectrometer was used to select 1472800200014 neutrons of the desired energy. 1472800200015 STATUS (CURVE) Fig. 10, page 43. 1472800200016 COMMENT Compiler's comment: Continuous fitted curve was 1472800200017 digitized. Points were chosen by the compiler. 1472800200018 ENDBIB 16 0 1472800200019 NOCOMMON 0 0 1472800200020 DATA 2 83 1472800200021 EN DATA 1472800200022 EV NO-DIM 1472800200023 1.023E-02 1.035 1472800200024 1.524E-02 1.025 1472800200025 1.971E-02 1.019 1472800200026 2.484E-02 1.003 1472800200027 3.011E-02 1.003 1472800200028 3.469E-02 0.981 1472800200029 3.944E-02 0.981 1472800200030 4.428E-02 0.970 1472800200031 5.035E-02 0.965 1472800200032 6.106E-02 0.948 1472800200033 7.124E-02 0.926 1472800200034 8.101E-02 0.916 1472800200035 9.095E-02 0.883 1472800200036 1.008E-01 0.877 1472800200037 1.501E-01 0.839 1472800200038 1.991E-01 0.932 1472800200039 2.509E-01 1.046 1472800200040 2.745E-01 1.041 1472800200041 3.004E-01 0.997 1472800200042 3.506E-01 0.861 1472800200043 3.988E-01 0.752 1472800200044 4.477E-01 0.665 1472800200045 5.027E-01 0.610 1472800200046 6.097E-01 0.529 1472800200047 6.933E-01 0.512 1472800200048 7.985E-01 0.550 1472800200049 9.077E-01 0.659 1472800200050 9.929E-01 0.763 1472800200051 1.072E+00 0.850 1472800200052 1.144E+00 0.752 1472800200053 1.252E+00 0.501 1472800200054 1.500E+00 0.338 1472800200055 2.015E+00 0.272 1472800200056 2.540E+00 0.332 1472800200057 2.962E+00 0.507 1472800200058 3.157E+00 0.665 1472800200059 3.410E+00 0.681 1472800200060 3.929E+00 0.490 1472800200061 4.033E+00 0.387 1472800200062 4.470E+00 0.305 1472800200063 4.954E+00 0.338 1472800200064 5.852E+00 0.512 1472800200065 6.908E+00 0.905 1472800200066 7.843E+00 1.520 1472800200067 8.040E+00 1.847 1472800200068 8.679E+00 2.087 1472800200069 9.494E+00 2.136 1472800200070 1.013E+01 2.071 1472800200071 1.489E+01 1.940 1472800200072 1.607E+01 2.251 1472800200073 1.691E+01 2.496 1472800200074 1.972E+01 2.747 1472800200075 2.187E+01 2.507 1472800200076 2.394E+01 2.256 1472800200077 2.688E+01 2.153 1472800200078 2.903E+01 2.256 1472800200079 3.134E+01 2.496 1472800200080 3.471E+01 2.741 1472800200081 3.843E+01 3.019 1472800200082 4.151E+01 3.079 1472800200083 4.370E+01 3.079 1472800200084 4.844E+01 3.008 1472800200085 5.953E+01 2.741 1472800200086 6.032E+01 2.670 1472800200087 6.774E+01 2.529 1472800200088 7.905E+01 2.447 1472800200089 8.874E+01 2.425 1472800200090 9.962E+01 2.431 1472800200091 1.239E+02 2.507 1472800200092 1.483E+02 2.599 1472800200093 1.797E+02 2.752 1472800200094 1.992E+02 2.796 1472800200095 2.478E+02 2.888 1472800200096 2.966E+02 2.861 1472800200097 3.461E+02 2.801 1472800200098 3.936E+02 2.757 1472800200099 4.363E+02 2.698 1472800200100 5.026E+02 2.654 1472800200101 5.940E+02 2.632 1472800200102 6.930E+02 2.649 1472800200103 7.879E+02 2.681 1472800200104 8.845E+02 2.687 1472800200105 9.677E+02 2.719 1472800200106 ENDDATA 85 0 1472800200107 ENDSUBENT 106 0 1472800299999 SUBENT 14728003 20220117 14951472800300001 BIB 3 5 1472800300002 REACTION 1(92-U-235(N,0),,EN) 1472800300003 2(92-U-235(N,F),,WID) 1472800300004 ANALYSIS A method of visual inspection. 1472800300005 STATUS (DEP,14728002) 1472800300006 (TABLE) pages 21,2. 1472800300007 ENDBIB 5 0 1472800300008 NOCOMMON 0 0 1472800300009 DATA 2 4 1472800300010 DATA 1DATA 2 1472800300011 EV EV 1472800300012 0.25 0.2 1472800300013 1.0 1472800300014 3.3 1472800300015 9.5 1472800300016 ENDDATA 6 0 1472800300017 ENDSUBENT 16 0 1472800399999 SUBENT 14728004 20220117 14951472800400001 BIB 7 23 1472800400002 REACTION (92-U-235(N,TOT),,SIG) 1472800400003 REL-REF (O,14666001,A.O.Hanson,R,CF-618,1943) Wisconsin values.1472800400004 SAMPLE (92-U-235,ENR=0.1374) A sample of uranium oxides 1472800400005 enriched in 25, was used. The amount of 235U 1472800400006 contained in the sample was 13.74% by weight of the 1472800400007 total amount of uranium present. The entire sample of 1472800400008 the oxide weighed 309.6 gm., but was divided into two 1472800400009 parts. These two parts, designated as #l and #2 1472800400010 contained approximately two third and one thirds, 1472800400011 respectively, of the total amount. The samples were 1472800400012 placed in cylindrical aluminum containers having an 1472800400013 inside diameter of 2.50 inches. Two other samples,#3 1472800400014 and #4 were made of normal tuballoy oxide. These were 1472800400015 placed in containers similar the enriched samples. 1472800400016 METHOD (TRN) The absolute transmission for various absorbers. 1472800400017 ERR-ANALYS (ERR-S) The probable errors are the statistical 1472800400018 errors associated with the timed counts only and do 1472800400019 not include the error in the total transmission. 1472800400020 ASSUMED (ASSUM1,92-U-238(N,SCT)92-U-238,,SIG) 1472800400021 (ASSUM2,92-U-238(N,G)92-U-239,,SIG) 1472800400022 (ASSUM3,92-U-235(N,G)92-U-236,,SIG) 1472800400023 (ASSUM4,8-O-0(N,SCT)8-O-0,,SIG) 1472800400024 STATUS (TABLE) page 27. 1472800400025 ENDBIB 23 0 1472800400026 NOCOMMON 0 0 1472800400027 DATA 7 1 1472800400028 EN DATA ERR-S ASSUM1 ASSUM2 ASSUM3 1472800400029 ASSUM4 1472800400030 EV B B B B B 1472800400031 B 1472800400032 0.0253 650.0 16.0 8.0 3.0 4.61472800400033 3.3 1472800400034 ENDDATA 6 0 1472800400035 ENDSUBENT 34 0 1472800499999 ENDENTRY 4 0 1472899999999