ENTRY 22211 20200925 22952221100000001 SUBENT 22211001 20200925 22952221100100001 BIB 12 50 2221100100002 TITLE Measurement of fast neutron induced fission cross 2221100100003 section ratios of Pu-240 and Pu-242 relative to U-235 2221100100004 AUTHOR (T.Iwasaki, F.Manabe, M.Baba, S.Matsuyama, H.Kimiyama, 2221100100005 N.Hirakawa) 2221100100006 REFERENCE (J,NST,27,885,1990) 2221100100007 (C,88MITO,,119,1988) 2221100100008 242Pu(n,f)/235U(n,f) in fig 2221100100009 (S,JAERI-M-88-065,357,1988)) 2221100100010 242Pu(n,f)/235U(n,f) in fig 2221100100011 INSTITUTE (2JPNTOH) 2221100100012 FACILITY (DYNAM,2JPNTOH) 4.5 MV Dynamitron accelerator 2221100100013 INC-SOURCE (P-LI7) En=0.6-1.4 MeV: 720 ug/cm2 LiF on Cu plate 2221100100014 En=1.4-1.8 MeV: 840 ug/cm2 LiF on Pt plate 2221100100015 (P-T) En=0.9-2.2 MeV: 600 ug/cm2 T-Ti 2221100100016 En=1.8-2.7 MeV: 2.5 mg/cm2 T-Ti 2221100100017 (D-D) En=3.6-6.9 MeV: D2 gas (1.5 atm) in Cu gas cell2221100100018 (10 mm inner diam., 30 mm length, sealed with 2221100100019 a 2.2 um thick Havar foil 2221100100020 INC-SPECT The neutron spectrum was measured by TOF by using a 2221100100021 NE213 scintillator (5.08 cm diam., 5.08 cm thick). 2221100100022 Since the solid angle for the fission chamber was 2221100100023 larger, the effective neutron spectrum was calculated 2221100100024 using a MONTE CARLO code. 2221100100025 SAMPLE Each sample (10-90 ug/cm2, 25 mm in diam.) 2221100100026 electroplated on a Pt plate (0.3 mm thick, 36 mm in 2221100100027 diam.), sintered into oxide to fix to the plate. 2221100100028 The number of atoms was detemrined by low geometry 2221100100029 alpha-spectrometry and impurities were analyzed by 2221100100030 mass spectrometry. 2221100100031 METHOD (TOF) TOF and pulse height signals recorded 2221100100032 DETECTOR (FISCH) Parallel plate low mass ionization chamber 2221100100033 (44 mm diam., 32 mm height) placed about 3 cm from 2221100100034 the neutron producing target. 2221100100035 The Pu and U samples mounted back-to-back were 2221100100036 rotated by 180 deg between the 1st and 2nd runs 2221100100037 (BF3) Placed about 6 m from the target at 90 deg to 2221100100038 the beam to monitor stablity of neutron generation. 2221100100039 CORRECTION Corrected for 2221100100040 - spontaneous fissions 2221100100041 - fissions by room-scattered neutrons, 2221100100042 - fission counts obscured by alpha-pulses 2221100100043 - self-absorption of fission fragments in sample foil 2221100100044 - non-uniformity of fission sample thickness 2221100100045 - impurity nuclides in fission sample 2221100100046 - parasitic neutrons and scattered neutrons 2221100100047 HISTORY (19930116C) N.O. 2221100100048 (19930329E) 2221100100049 (20071016A) Date is corrected. Covariance matrices 2221100100050 added to SAN 002, 003 - SM 2221100100051 (20200925A) On. Recompiled. 2221100100052 ENDBIB 50 0 2221100100053 NOCOMMON 0 0 2221100100054 ENDSUBENT 53 0 2221100199999 SUBENT 22211002 20200925 22952221100200001 BIB 7 46 2221100200002 REACTION ((94-PU-240(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2221100200003 SAMPLE (92-U-235,ENR=0.9991) 2221100200004 233U(5E-6%), 234U(0.03%), 236U(0.02%), 238U(0.04%). 2221100200005 90.51 ug/cm2 (U-235a) and 149.9 ug/cm2 (U-235b) 2221100200006 (94-PU-240,ENR=0.9868) 2221100200007 238Pu(0.007%),239Pu(0.75%),241Pu(0.32%),242Pu(0.24%). 2221100200008 97.08 ug/cm2 2221100200009 COVARIANCE (XY,19,EN,MEV) 2221100200010 0.669 0.796 0.922 1.014 1.203 1.400 1.579 1.652 2221100200011 1.892 2.124 2.389 2.621 3.609 4.021 4.579 5.270 2221100200012 5.699 6.262 6.567 2221100200013 (Z,190,PER-CENT,COR) 2221100200014 100 2221100200015 41 100 2221100200016 34 37 100 2221100200017 34 35 28 100 2221100200018 34 26 25 26 100 2221100200019 41 32 30 31 37 100 2221100200020 43 36 32 33 36 43 100 2221100200021 43 31 30 32 40 48 47 100 2221100200022 50 48 40 40 40 48 50 50 100 2221100200023 44 32 31 33 41 48 48 54 52 100 2221100200024 45 33 32 33 41 49 48 54 53 55 100 2221100200025 41 27 28 30 40 47 46 53 48 54 55 100 2221100200026 49 55 42 40 35 43 47 43 59 44 46 40 100 2221100200027 48 50 39 39 36 43 46 44 57 45 46 41 59 2221100200028 100 2221100200029 46 45 37 37 37 44 46 46 55 47 48 44 55 2221100200030 54 100 2221100200031 44 42 35 35 35 42 44 44 52 45 46 42 51 2221100200032 49 49 100 2221100200033 36 28 26 27 32 38 38 42 42 42 43 41 37 2221100200034 38 39 37 100 2221100200035 31 22 22 23 29 34 33 38 36 38 38 37 31 2221100200036 32 33 32 30 100 2221100200037 36 37 29 29 27 33 35 34 43 35 35 32 43 2221100200038 41 40 38 29 25 100 2221100200039 ERR-ANALYS (ERR-T) Overall uncertainty (1.5-2.6%) 2221100200040 (ERR-1) Number of 240Pu atoms (0.3%) 2221100200041 (ERR-2,1.0,2.1) Fission rates (1.0-2.1%) 2221100200042 (ERR-3,0.1,1.8) Correction (0.1-1.8%) 2221100200043 MISC-COL (MISC) Overall uncertainty in the absolute unit 2221100200044 STATUS (TABLE) Table 5 of J.Nucl.Sci.Technol.27(1990)885 2221100200045 HISTORY (20071016A) S.M. Covariation matrix added from 2221100200046 main reference. SAMPLE keyword moved from SAN 001 2221100200047 (20200925A) On. COVARIANCE reformatted. Data checked. 2221100200048 ENDBIB 46 0 2221100200049 COMMON 1 3 2221100200050 ERR-1 2221100200051 PER-CENT 2221100200052 0.3 2221100200053 ENDCOMMON 3 0 2221100200054 DATA 5 19 2221100200055 EN EN-RSL-HW DATA ERR-T MISC 2221100200056 MEV MEV NO-DIM PER-CENT NO-DIM 2221100200057 0.669 0.040 0.699 1.87 0.013 2221100200058 0.796 0.033 1.034 2.51 0.026 2221100200059 0.922 0.048 1.162 2.58 0.030 2221100200060 1.014 0.059 1.195 2.45 0.029 2221100200061 1.203 0.073 1.254 1.98 0.025 2221100200062 1.400 0.069 1.238 1.71 0.021 2221100200063 1.579 0.056 1.249 1.74 0.022 2221100200064 1.652 0.340 1.288 1.54 0.020 2221100200065 1.892 0.334 1.314 1.61 0.021 2221100200066 2.124 0.330 1.303 1.52 0.020 2221100200067 2.389 0.326 1.293 1.52 0.020 2221100200068 2.621 0.318 1.333 1.55 0.021 2221100200069 3.609 0.390 1.427 1.85 0.026 2221100200070 4.021 0.304 1.407 1.82 0.026 2221100200071 4.579 0.256 1.428 1.76 0.025 2221100200072 5.270 0.242 1.464 1.85 0.027 2221100200073 5.699 0.246 1.506 1.99 0.030 2221100200074 6.262 0.260 1.456 2.23 0.032 2221100200075 6.567 0.270 1.393 2.44 0.034 2221100200076 ENDDATA 21 0 2221100200077 ENDSUBENT 76 0 2221100299999 SUBENT 22211003 20200925 22952221100300001 BIB 7 43 2221100300002 REACTION ((94-PU-242(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2221100300003 SAMPLE (92-U-235,ENR=0.9991) 2221100300004 233U(5E-6%), 234U(0.03%), 236U(0.02%), 238U(0.04%). 2221100300005 90.51 ug/cm2 (U-235a) and 149.9 ug/cm2 (U-235b) 2221100300006 (94-PU-242,ENR=0.9984) 2221100300007 238Pu(0.003%),239Pu(0.02%),240Pu(0.08%),241Pu(0.04%), 2221100300008 241Am(0.02%). 2221100300009 10.46 ug/cm2. 2221100300010 COVARIANCE (XY,17,EN,MEV) 2221100300011 0.597 0.797 0.898 0.906 1.010 1.098 1.117 1.193 2221100300012 1.376 1.390 1.693 2.144 3.908 5.182 5.700 6.195 2221100300013 6.759 2221100300014 (Z,153,PER-CENT,COR) 2221100300015 100 2221100300016 46 100 2221100300017 40 32 100 2221100300018 56 43 37 100 2221100300019 37 29 25 34 100 2221100300020 56 44 38 53 35 100 2221100300021 37 30 26 35 24 35 100 2221100300022 40 32 28 37 26 38 26 100 2221100300023 55 44 38 51 35 52 35 38 100 2221100300024 57 45 38 53 35 54 36 38 53 100 2221100300025 57 45 39 54 35 55 36 39 53 55 100 2221100300026 52 41 36 49 33 50 33 36 49 51 52 100 2221100300027 58 45 39 54 35 54 36 38 53 55 55 51 100 2221100300028 49 38 33 46 30 47 31 33 46 47 48 44 48 2221100300029 100 2221100300030 46 36 31 44 29 44 29 31 43 45 45 42 45 2221100300031 39 100 2221100300032 43 34 29 40 27 41 27 29 40 42 42 39 42 2221100300033 37 35 100 2221100300034 39 31 26 37 24 38 25 26 37 38 39 36 38 2221100300035 34 32 30 100 2221100300036 ERR-ANALYS (ERR-T) Overall uncertainty (1.8-2.7%) 2221100300037 (ERR-1) Number of 240Pu atoms (0.8%) 2221100300038 (ERR-2,1.0,2.3) Fission rates (1.0-2.3%) 2221100300039 (ERR-3,0.0,2.1) Correction (0.0-2.1%) 2221100300040 MISC-COL (MISC) Overall uncertainty in the absolute unit 2221100300041 STATUS (TABLE) Table 6 of J.Nucl.Sci.Technol.27(1990)885 2221100300042 HISTORY (20071016A) S.M. Covariation matrix added from 2221100300043 main reference. SAMPLE keyword moved from SAN 001 2221100300044 (20200925A) On. COVARIANCE reformatted. Data checked. 2221100300045 ENDBIB 43 0 2221100300046 COMMON 1 3 2221100300047 ERR-1 2221100300048 PER-CENT 2221100300049 0.8 2221100300050 ENDCOMMON 3 0 2221100300051 DATA 5 17 2221100300052 EN EN-RSL-HW DATA ERR-T MISC 2221100300053 MEV MEV NO-DIM PER-CENT NO-DIM 2221100300054 0.597 0.066 0.344 1.75 0.006 2221100300055 0.797 0.061 0.747 2.19 0.016 2221100300056 0.898 0.055 0.933 2.52 0.024 2221100300057 0.906 0.055 0.991 1.86 0.018 2221100300058 1.010 0.062 1.123 2.73 0.031 2221100300059 1.098 0.064 1.203 1.81 0.022 2221100300060 1.117 0.054 1.181 2.69 0.032 2221100300061 1.193 0.061 1.169 2.50 0.029 2221100300062 1.376 0.058 1.074 1.85 0.020 2221100300063 1.390 0.063 1.142 1.81 0.021 2221100300064 1.693 0.071 1.078 1.80 0.019 2221100300065 2.144 0.077 1.067 1.95 0.021 2221100300066 3.908 0.316 1.111 1.82 0.020 2221100300067 5.182 0.252 1.159 2.15 0.025 2221100300068 5.700 0.258 1.261 2.28 0.029 2221100300069 6.195 0.272 1.293 2.44 0.032 2221100300070 6.759 0.288 1.231 2.71 0.033 2221100300071 ENDDATA 19 0 2221100300072 ENDSUBENT 71 0 2221100399999 ENDENTRY 3 0 2221199999999