ENTRY 20369 20051110 21742036900000001 SUBENT 20369001 20051110 21742036900100001 BIB 13 62 2036900100002 INSTITUTE (2BLGMOL) 2036900100003 REFERENCE (C,70HELSINKI,1,461,197006) 2036900100004 (W,CEULEMANS,197102) DATA ON CARDS. 2036900100005 AUTHOR (H.CEULEMANS, F.POORTMANS) 2036900100006 TITLE -The scattering cross-section of 92-u-235 between 2036900100007 0.025 ev and 1 eV.- 2036900100008 FACILITY (SPECC) Crystal spectrometer with a silicon single 2036900100009 crystal (111). 2036900100010 INC-SOURCE (REAC ) THE BR2 REACTOR OF SCK/CEN, MOL. 2036900100011 INC-SPECT .From the (111) planes of a silicon single crystal, 2036900100012 the second order diffraction is forbidden and third 2036900100013 plus higher order contamination amounted to less than 2036900100014 1 per cent. 2036900100015 .the neutron beam had a diameter of about 0.20 cm and 2036900100016 covered only part of the sample surface. 2036900100017 METHOD (DIFFR) The diffraction on the (111) planes of a 2036900100018 silicon crystal. 2036900100019 DETECTOR (PROPC) Scattering and fission neutrons detected in 2036900100020 a scattering chamber equipped with he-3 proportional 2036900100021 counters. 2036900100022 .The axes of the He3 proportional counters are parallel2036900100023 to the incident beam and scattering neutrons between 2036900100024 15 degrees and 165 degrees angles can be detected. 2036900100025 .fission counts in high energy channels used for 2036900100026 correcting for fission counts in the low channel, 2036900100027 see correction. 2036900100028 STATUS .Data taken from private communication and from 2036900100029 helsinki conference proceedings. 2036900100030 HISTORY (19710303C) 2036900100031 (19740929E) 2036900100032 (19820217A) A.P.T. SUBENTRY 007 ADDED, 'ISO-QUANT' 2036900100033 AND 'STANDARD' CHANGED TO 'REACTION' 2036900100034 AND 'MONITOR'. 2036900100035 (19820921E) 2036900100036 (19830420A) A.P.T. SUBWORK 7 SPLIT INTO TWO 2036900100037 SUBWORKS 2036900100038 (19830429E) 2036900100039 (19830727U) IN SE007,008 'COMMENT' CHANGED TO 2036900100040 'ANALYSIS' 2036900100041 (19831004E) 2036900100042 (19860415U)N.CH 2036900100043 (19860703E) 2036900100044 (20051110A) DATE is corrected. REACTION errors correct.2036900100045 CORRECTION .The third plus higher contamination in the neutrons 2036900100046 of the desired energy is less than 1 per cent. 2036900100047 .with high statistical accuracy the total cross-section2036900100048 was measured as a check on local thickness 2036900100049 fluctuations, and the conclusion is that the local 2036900100050 thickness is lower than the average thickness by 2036900100051 (1 +- 0.5) per cent. 2036900100052 .A simple yet reliable correction for the fraction of 2036900100053 the number of fission neutrons was made using the 2036900100054 high and low channel and a thin cd-shield around the 2036900100055 sample. 2036900100056 ERR-ANALYS .The experimental standard deviation is about 1 per- 2036900100057 cent. the errors of the cross section represents two 2036900100058 standard deviations for the 2nd series of experiments 2036900100059 consisting of a scan between 0.8 ev and 0.025 ev. 2036900100060 .for the 1st series experiments between 0.02 ev and 0.22036900100061 ev, the measurement was repeated a large number of 2036900100062 times such that the variance of the mean was less than2036900100063 0.5 per cent at each point. 2036900100064 ENDBIB 62 0 2036900100065 NOCOMMON 0 0 2036900100066 ENDSUBENT 65 0 2036900199999 SUBENT 20369002 20051110 21742036900200001 BIB 4 11 2036900200002 REACTION (23-V-0(N,G),,SIG) 2036900200003 ANALYSIS TOTAL CROSS-SECTION FROM SUBENTRY .004 FITTED TO THE 2036900200004 FORM SIGMA(TOT) = A + B/SQRT(E), WHERE 2036900200005 - A = SIGMA(EL) = 4.87+-0.05 BARN AND 2036900200006 - B = SIGMA(NG)*SQRT(E) = 0.81+-0.01 BARN*RT(EV). 2036900200007 STATUS (DEP,20369004) 2036900200008 .TAKEN FROM 1970 HELSINKI CONF.,VOL.1,P.461. 2036900200009 HISTORY (19740422C) 2036900200010 (19740929E) 2036900200011 (19820217A) A.P.T. 'ISO-QUANT' CHANGED TO 'REACTION' 2036900200012 (19820921E) 2036900200013 ENDBIB 11 0 2036900200014 NOCOMMON 0 0 2036900200015 DATA 3 1 2036900200016 EN DATA DATA-ERR 2036900200017 MEV B B 2036900200018 2.5300E-08 5.1200E+00 6.0000E-02 2036900200019 ENDDATA 3 0 2036900200020 ENDSUBENT 19 0 2036900299999 SUBENT 20369003 20051110 21742036900300001 BIB 5 15 2036900300002 REACTION (23-V-0(N,EL)23-V-0,,SIG) 2036900300003 ANALYSIS TOTAL CROSS-SECTION FROM SUBENTRY .004 FITTED TO THE 2036900300004 FORM SIGMA(TOT) = A + B/SQRT(E), WHERE 2036900300005 - A = SIGMA(EL) = 4.87+-0.05 BARN AND 2036900300006 - B = SIGMA(NG)*SQRT(E) = 0.81+-0.01 BARN*RT(EV). 2036900300007 COMMENT .A DIRECT COMPARISON WITH A SCATTERING MEASUREMENT AT 2036900300008 0.76 EV BASED ON LEAD, SIGMA(EL,PB) = 11.28+-0.06 B., 2036900300009 RAYBURN, WOLLAN, NUCL.PHYS.,61(1965)381, YIELDED THE 2036900300010 SAME RESULT. 2036900300011 STATUS (DEP,20369004) 2036900300012 .TAKEN FROM 1970 HELSINKI CONF.,VOL.1,P.461. 2036900300013 HISTORY (19740422C) 2036900300014 (19740929E) 2036900300015 (19820217A) A.P.T. 'ISO-QUANT' CHANGED TO 'REACTION' 2036900300016 (19820921E) 2036900300017 ENDBIB 15 0 2036900300018 NOCOMMON 0 0 2036900300019 DATA 3 1 2036900300020 EN DATA DATA-ERR 2036900300021 MEV B B 2036900300022 2.5300E-08 4.8700E+00 5.0000E-02 2036900300023 ENDDATA 3 0 2036900300024 ENDSUBENT 23 0 2036900399999 SUBENT 20369004 20051110 21742036900400001 BIB 6 13 2036900400002 REACTION (23-V-0(N,TOT),,SIG) 2036900400003 SAMPLE .DIAMETER 3.002 CM, THICKNESS 2.070E22 AT/B (SEE FLAG).2036900400004 FLAG (1.) SAMPLE THICKNESS 6.936E21 AT/B. 2036900400005 STATUS .TAKEN FROM PRIV.COMM. CEULEMANS, LETTER TO NDCC 7312202036900400006 HISTORY (19740902C) 2036900400007 (19740929E) 2036900400008 (19820217A) A.P.T. 'ISO-QUANT' CHANGED TO 'REACTION' 2036900400009 (19820921E) 2036900400010 ERR-ANALYS .Energy resolution based on the systematic error of 2036900400011 the crystal spectrometer. the relative values of the 2036900400012 energies were about ten times more accurate. 2036900400013 .the data error estimates are the results of 2036900400014 a statistical analysis on the raw transmission data. 2036900400015 ENDBIB 13 0 2036900400016 NOCOMMON 0 0 2036900400017 DATA 5 9 2036900400018 EN EN-RSL DATA DATA-ERR FLAG 2036900400019 MEV MEV B B NO-DIM 2036900400020 2.5240E-08 5.0000E-11 1.0080E+01 6.0000E-02 2036900400021 3.5750E-08 8.0000E-11 9.0600E+00 1.0000E-01 1.0000E+00 2036900400022 4.1350E-08 1.0000E-10 8.8000E+00 4.0000E-02 2036900400023 6.9420E-08 2.0000E-10 7.9300E+00 4.0000E-02 2036900400024 1.0050E-07 4.0000E-10 7.4100E+00 4.0000E-02 2036900400025 3.9500E-07 3.0000E-09 6.1200E+00 9.0000E-02 2036900400026 6.6040E-07 7.0000E-09 5.8500E+00 8.0000E-02 2036900400027 7.6300E-07 8.0000E-09 5.7800E+00 1.9000E-01 1.0000E+00 2036900400028 1.0030E-06 1.0000E-08 5.7600E+00 9.0000E-02 2036900400029 ENDDATA 11 0 2036900400030 ENDSUBENT 29 0 2036900499999 SUBENT 20369005 20051110 21742036900500001 BIB 6 21 2036900500002 REACTION (92-U-235(N,EL)92-U-235,,SIG) 2036900500003 SAMPLE .ROLLED METAL, DIAMETER = 3.09 CM, 2036900500004 AVERAGE THICKNESS = 0.3318 +- 0.002 G/CM2, 2036900500005 TOTAL MASS = 2.4884 +- 0.0002 G. 2036900500006 .ISOTOPIC COMPOSITION IN PER CENT, 2036900500007 U-235 93.154, U-234 0.781, 2036900500008 U-236 0.227, U-238 5.838. 2036900500009 MONITOR (23-V-0(N,EL)23-V-0,,SIG) Value taken from SAN 003 2036900500010 COMMENT .As the standard, vanadium was chosen because unlike 2036900500011 lead it does not show coherent scattering effects. 2036900500012 .the scattering cross was further checked by a direct 2036900500013 comparison with lead at about 0.76 ev where no 2036900500014 coherent scattering effects occur. 2036900500015 STATUS (DEP,20369003) 2036900500016 (DEP,20369004) 2036900500017 .Data taken from private communication ceulemans. 2036900500018 HISTORY (19710303C) 2036900500019 (19740929E) 2036900500020 (19820217A)A.P.T. 'ISO-QUANT' AND 'STANDARD' CHANGED TO2036900500021 'REACTION' AND 'MONITOR' 2036900500022 (19820921E) 2036900500023 ENDBIB 21 0 2036900500024 NOCOMMON 0 0 2036900500025 DATA 3 32 2036900500026 EN DATA DATA-ERR 2036900500027 MEV B B 2036900500028 2.4400E-08 1.5450E+01 4.8000E-02 2036900500029 2.5310E-08 1.4770E+01 2.2000E-02 2036900500030 2.7450E-08 1.3610E+01 5.1000E-02 2036900500031 3.1130E-08 1.3970E+01 3.1000E-02 2036900500032 3.3380E-08 1.4240E+01 3.7000E-02 2036900500033 3.5630E-08 1.4940E+01 4.3000E-02 2036900500034 4.1200E-08 1.4160E+01 7.0000E-03 2036900500035 4.1360E-08 1.3870E+01 3.6000E-02 2036900500036 4.8220E-08 1.3840E+01 2.3000E-02 2036900500037 5.7230E-08 1.4330E+01 1.5000E-02 2036900500038 5.7490E-08 1.4200E+01 2.0000E-02 2036900500039 6.9080E-08 1.3660E+01 2.9000E-02 2036900500040 6.9420E-08 1.3500E+01 3.6000E-02 2036900500041 8.5090E-08 1.3950E+01 4.6000E-02 2036900500042 8.5560E-08 1.3890E+01 2.8000E-02 2036900500043 1.0750E-07 1.3990E+01 3.9000E-02 2036900500044 1.0810E-07 1.3830E+01 2.0000E-02 2036900500045 1.4010E-07 1.3820E+01 4.0000E-02 2036900500046 1.4070E-07 1.3550E+01 3.3000E-02 2036900500047 1.9020E-07 1.3800E+01 5.1000E-02 2036900500048 1.9150E-07 1.3560E+01 2.5000E-02 2036900500049 2.1440E-07 1.3640E+01 7.9000E-02 2036900500050 2.4910E-07 1.4460E+01 4.1000E-01 2036900500051 2.7330E-07 1.3770E+01 8.7000E-02 2036900500052 2.7510E-07 1.3570E+01 1.0300E-01 2036900500053 3.1570E-07 1.3850E+01 8.5000E-02 2036900500054 3.6610E-07 1.3430E+01 1.4200E-01 2036900500055 4.2600E-07 1.3620E+01 1.3300E-01 2036900500056 4.2950E-07 1.3590E+01 9.6000E-02 2036900500057 5.1100E-07 1.3030E+01 2.0200E-01 2036900500058 6.1820E-07 1.3060E+01 8.6000E-02 2036900500059 7.6300E-07 1.3000E+01 1.1800E-01 2036900500060 ENDDATA 34 0 2036900500061 ENDSUBENT 60 0 2036900599999 SUBENT 20369006 20051110 21742036900600001 BIB 4 12 2036900600002 REACTION (92-U-235(N,EL)92-U-235,,SIG) 2036900600003 COMMENT .VALUE AT 2200 M/SEC INTERPOLATED FROM DATA IN 2036900600004 SUBENTRY 005, EXCLUDING GEOMETRY-DEPENDENT EFFECTS 2036900600005 STATUS (DEP,20369005) 2036900600006 (DEP,20369003) 2036900600007 (DEP,20369004) 2036900600008 .DATA TAKEN FROM 1970 HELSINKI CONF., VOL.1,P.461. 2036900600009 HISTORY (19710303C) 2036900600010 (19740929E) 2036900600011 (19820217A) A.P.T. 'ISO-QUANT' CHANGED TO 'REACTION' 2036900600012 COMMENT REWRITTEN. 2036900600013 (19820921E) 2036900600014 ENDBIB 12 0 2036900600015 NOCOMMON 0 0 2036900600016 DATA 3 1 2036900600017 EN DATA DATA-ERR 2036900600018 MEV B B 2036900600019 2.5300E-08 1.4300E+01 5.0000E-01 2036900600020 ENDDATA 3 0 2036900600021 ENDSUBENT 20 0 2036900699999 SUBENT 20369007 20051110 21742036900700001 BIB 5 19 2036900700002 REACTION (92-U-235(N,F),,SIG) 2036900700003 ANALYSIS .VALUES AT 2200 M/SEC CALCULATED FROM THE 2036900700004 ELASTIC CROSS SECTION IN SUBENTRY 006 2036900700005 AND THE FOLLOWING ASSUMED VALUES. 2036900700006 ASSUMED (ASSUM1,92-U-235(N,TOT),,SIG) AT 2200 M/SEC 2036900700007 (ASSUM2,92-U-235(N,ABS),,ALF) AT 2200 M/SEC 2036900700008 BOTH THE ABOVE VALUES TAKEN FROM G.C.HANNA+ 2036900700009 ATOMIC ENERGY REVIEW, VOL VII (1969) NO. 4 2036900700010 STATUS (DEP,20369006) 2036900700011 (DEP,20369005) 2036900700012 (DEP,20369003) 2036900700013 (DEP,20369004) 2036900700014 .DATA TAKEN FROM 1970 HELSNKI CONF.,VOL1,P.461. 2036900700015 HISTORY (19820217C) A.P.T. 2036900700016 (19820921E) 2036900700017 (19830420A) A.P.T. SUBWORK SPLIT INTO TWO PARTS. 2036900700018 (19830429E) 2036900700019 (19830727U) 'COMMENT' CHANGED TO 'ANALYSIS' 2036900700020 (19831004E) 2036900700021 ENDBIB 19 0 2036900700022 NOCOMMON 0 0 2036900700023 DATA 7 1 2036900700024 EN DATA DATA-ERR ASSUM1 ASSUM1-ERR ASSUM2 2036900700025 ASSUM2-ERR 2036900700026 EV B B B B NO-DIM 2036900700027 NO-DIM 2036900700028 2.5300E-02 5.8300E+02 4.5000E+00 6.9600E+02 3.5000E+00 1.6940E-012036900700029 1.9000E-03 2036900700030 ENDDATA 6 0 2036900700031 ENDSUBENT 30 0 2036900799999 SUBENT 20369008 20051110 21742036900800001 BIB 5 18 2036900800002 REACTION (92-U-235(N,G)92-U-236,,SIG) 2036900800003 ANALYSIS .VALUES AT 2200 M/SEC CALCULATED FROM THE 2036900800004 ELASTIC CROSS SECTION IN SUBENTRY 006 2036900800005 AND THE FOLLOWING ASSUMED VALUES. 2036900800006 ASSUMED (ASSUM1,92-U-235(N,TOT),,SIG) AT 2200 M/SEC 2036900800007 (ASSUM2,92-U-235(N,ABS),,ALF) AT 2200 M/SEC 2036900800008 BOTH THE ABOVE VALUES TAKEN FROM G.C.HANNA+ 2036900800009 ATOMIC ENERGY REVIEW, VOL VII (1969) NO. 4 2036900800010 STATUS (DEP,20369006) 2036900800011 (DEP,20369005) 2036900800012 (DEP,20369003) 2036900800013 (DEP,20369004) 2036900800014 .DATA TAKEN FROM 1970 HELSINKI CONF.,VOL1,P.461. 2036900800015 HISTORY (19830420A) A.P.T. THE DATA IN THIS SUBWORK WAS 2036900800016 ORIGINALLY CONTAINED IN SUBWORK 7 2036900800017 (19830429E) 2036900800018 (19830727U) 'COMMENT' CHANGED TO 'ANALYSIS' 2036900800019 (19831004E) 2036900800020 ENDBIB 18 0 2036900800021 NOCOMMON 0 0 2036900800022 DATA 7 1 2036900800023 EN DATA DATA-ERR ASSUM1 ASSUM1-ERR ASSUM2 2036900800024 ASSUM2-ERR 2036900800025 EV B B B B NO-DIM 2036900800026 NO-DIM 2036900800027 2.5300E-02 9.8700E+01 4.5000E+00 6.9600E+02 3.5000E+00 1.6940E-012036900800028 1.9000E-03 2036900800029 ENDDATA 6 0 2036900800030 ENDSUBENT 29 0 2036900899999 ENDENTRY 8 0 2036999999999