ENTRY 20143 20160725 22522014300000001 SUBENT 20143001 20160725 22522014300100001 BIB 12 45 2014300100002 INSTITUTE (2ZZZGEL) Authors. 2014300100003 (2BLGMOL) Experimental site. 2014300100004 REFERENCE (C,70HELSINKI,1,117,197006) Measurements U-235,Pu-239 2014300100005 (J,JNE,27,(9),645,197309) Data for U-235. 2014300100006 (J,ANE,1,(5),311,197405) data for Pu-239. 2014300100007 (W,WAGEMANS,19800527) cross section data of Pu-239. 2014300100008 (C,68WASH,1,491,196803) analysis meth., prelim. values 2014300100009 REL-REF (M,20131001,A.J.Deruytter+,J,JNE,25,263,197107) - value2014300100010 of fission integral cited. 2014300100011 AUTHOR (A.J.Deruytter, W.Becker) 2014300100012 TITLE Precise 2200 m/sec fission cross-sections of Pu-239 2014300100013 and U-235 2014300100014 FACILITY (REAC,2BLGMOL) Belgian BR2 high flux reactor. 2014300100015 (CHOPS,2BLGMOL) Slow chopper. 2014300100016 INC-SOURCE (REAC ) BR2-reactor, the slow chopper was installed 2014300100017 at the tangential beam tube T-7. 2014300100018 METHOD (TOF ) Time of flight, flight path = 2 m. 2014300100019 DETECTOR (SIBAR) One large Au-Si surface barrier detector was2014300100020 used for the detection of fission fragments and alpha-2014300100021 particles from B-10. The detection of the alphas and 2014300100022 fission fragments was made with excellent pulse-height2014300100023 resolution in low geometry. 2014300100024 ANALYSIS Straight line fit through 20 points between 0.005 and 2014300100025 0.1 eV for 2200 m/sec values and integrals. 2014300100026 MONITOR (5-B-10(N,A)3-LI-7,,SIG) = 3835 +- 5 barn at 2200 m/sec2014300100027 Evaporated boron layer. 2014300100028 The absolute B-10 contents was determined from direct 2014300100029 weighing in vacuum and correction for chemical and 2014300100030 isotopic analysis. 2014300100031 Isotopic composition of the elemental boron, B-weight,2014300100032 sample B64 * sample B74 2014300100033 B-10 * 20.127 +- 0.046 * 20.330 +- 0.065 2014300100034 B-11 * 79.873 +- 0.046 * 79.670 +- 0.065 2014300100035 boron (weights in micro-g B-10) 2014300100036 * 146.28 +- 0.38 * 99.11 +- 0.26 2014300100037 HISTORY (19710311C) 2014300100038 (19790426A) updated with data from ref. JNE,27,9 and 2014300100039 ANE,1,5. 2014300100040 (19800523A) G.C., Reaction strings corrected. 2014300100041 Data from private communication added. 2014300100042 (19800612E) 2014300100043 (20160725A) SD:Updated to new date formats,lower case. 2014300100044 Refs ANE,JNE update (issue numbers were parenthesized).2014300100045 Refs swapped (first ref was changed). One ref moved to 2014300100046 REL-REF. ERR-ANALYS update. 2014300100047 ENDBIB 45 0 2014300100048 COMMON 3 3 2014300100049 EN-NRM MONIT MONIT-ERR 2014300100050 EV B B 2014300100051 2.5300E-02 3835. 5. 2014300100052 ENDCOMMON 3 0 2014300100053 ENDSUBENT 52 0 2014300199999 SUBENT 20143002 20160725 22522014300200001 BIB 6 35 2014300200002 REACTION (92-U-235(N,F),,SIG) 2014300200003 SAMPLE Deposited on gold coated quartz 2014300200004 disks, U-235 was evaporated as U-F(4). 2014300200005 Isotopic composition in per-cent, 2014300200006 U-234 1.0812 +- 0.0020, U-235 93.336 +- 0.010, 2014300200007 U-236 0.2027 +- 0.0006, U-238 5.380 +- 0.005, 2014300200008 in U235-F(4) samples (U4,U5 NBS-930). 2014300200009 The amounts of U-235 on the foils were determined 2014300200010 from precise low-geometry alpha-counting. 2014300200011 The neutron induced fission rates were checked as a 2014300200012 relative control. 2014300200013 Weights of U-samples (weights in micro-g U-235) are 2014300200014 1597.8 +- 2.8 (sample U4), 3228.0 +- 5.7 (sample U5). 2014300200015 The determination of the specific activity of U-sample2014300200016 (nbs-930) is heavily dependent on the alpha-half-life 2014300200017 of U-234. 2014300200018 PART-DET (FF) Fission fragments. 2014300200019 COMMENT A final value for the 2200 m/sec fission cross-section2014300200020 of 92-U-235 was obtained, making use of a carefully 2014300200021 redetermined value of the U-234 alpha-half-life of 2014300200022 (2.446 +- 0.002)*E+5 years at CBNM. 2014300200023 The thermal fission cross section of U-235 as 2014300200024 recommended by the IAEA-review (Hanna et al.,Atomic 2014300200025 Energy Review,VII,4(1963)3.) may be too low by a few 2014300200026 barns. 2014300200027 .The Westcott g(F) values for 20.44 deg-C Maxwell- 2014300200028 distribution is g(F) = 0.9780 +- 0.0010. 2014300200029 STATUS (TABLE) From table 12 in ref JNE,27,9,645. 2014300200030 ERR-ANALYS (ERR-T) Total standard error 0.45% including: 2014300200031 (ERR-S) Statistical error 2014300200032 (ERR-1) uncertainty in ratio of N(10B)/N(235U) 2014300200033 (ERR-2) uncertainty in ratio of efficiencies for alpha-2014300200034 particles of B and fission fragments 2014300200035 * uncertainty in neutron velocity calibration 2014300200036 and MONIT-ERR (see Subent 001). 2014300200037 ENDBIB 35 0 2014300200038 NOCOMMON 0 0 2014300200039 DATA 6 1 2014300200040 EN DATA ERR-S ERR-1 ERR-2 ERR-T 2014300200041 MEV B PER-CENT PER-CENT PER-CENT B 2014300200042 2.5300E-08 587.6 0.15 0.38 0.14 2.6 2014300200043 ENDDATA 3 0 2014300200044 ENDSUBENT 43 0 2014300299999 SUBENT 20143003 20160725 22522014300300001 BIB 5 7 2014300300002 REACTION (92-U-235(N,F),,ARE) 2014300300003 PART-DET (FF) Fission fragments. 2014300300004 COMMENT A value of 19.02+-0.08 barn*eV is reported based 2014300300005 on IAEA best value, sigma(0,fission) = 580.2+-1.8 barn2014300300006 and used for normalization in EANDC(E)-129. 2014300300007 STATUS (TABLE) Published on p.673 in ref JNE,27,645. 2014300300008 ERR-ANALYS (DATA-ERR) No information given 2014300300009 ENDBIB 7 0 2014300300010 NOCOMMON 0 0 2014300300011 DATA 4 1 2014300300012 EN-RES-MAX EN-RES-MIN DATA DATA-ERR 2014300300013 MEV MEV B*EV B*EV 2014300300014 6.2390E-08 2.0600E-08 19.26 0.08 2014300300015 ENDDATA 3 0 2014300300016 ENDSUBENT 15 0 2014300399999 SUBENT 20143004 20160725 22522014300400001 BIB 6 33 2014300400002 REACTION (94-PU-239(N,F),,SIG) 2014300400003 The 2200 m/s fission cross-sections. 2014300400004 SAMPLE Deposited on gold coated quartz disks, 2014300400005 Pu-239 was deposited as Pu-acetate by electrospraying.2014300400006 Isotopic composition in per-cent, 2014300400007 Pu-239 99.979, Pu-240 0.02, Pu-241 0.001, 2014300400008 in Pu-acetate-samples (TP442-1 and TP442-3). 2014300400009 The amounts of U-235 and Pu-239 on the foils were 2014300400010 determined from precise low-geometry alpha-counting. 2014300400011 The neutron induced fission rates were checked as a 2014300400012 relative control. 2014300400013 Weights of Pu-samples (weights in micro-g Pu-239) are 2014300400014 267.72 +- 0.43 (sample TP442-1) and 1010.40 +- 1.62 2014300400015 (sample TP442-3). 2014300400016 PART-DET (FF) Fission fragments. 2014300400017 COMMENT The separation between the pile-up tail produced by 2014300400018 the alpha-particles of Pu-239 and the fission fragment2014300400019 pulse-height distribution was very good. 2014300400020 The Westcott g(F) values for 20.44 deg-C Maxwell- 2014300400021 distribution is 2014300400022 g(F)= 1.0540 +- 0.00018(BR2), 1.0566 +- 0.018(Linac). 2014300400023 For Pu-239, the present results seem to confirm 2014300400024 completely the recommended values (Hanna et al.,Atomic2014300400025 Energy Review,VII,4(1969)3 ). 2014300400026 STATUS (TABLE) From table 10 in ref ANE,1,5,311. 2014300400027 ERR-ANALYS (ERR-T) Total standard error 0.45% including: 2014300400028 (ERR-S) Statistical error 2014300400029 (ERR-1) uncertainty in number of 239Pu atoms 2014300400030 (ERR-2) uncertainty in number of 10B atoms 2014300400031 (ERR-3) uncertainty in ratio of efficiencies for alpha-2014300400032 particles of B and fission fragments 2014300400033 (ERR-4) uncertainty in neutron velocity calibration 2014300400034 and MONIT-ERR (see Subent 001). 2014300400035 ENDBIB 33 0 2014300400036 NOCOMMON 0 0 2014300400037 DATA 8 1 2014300400038 EN DATA ERR-T ERR-S ERR-1 ERR-2 2014300400039 ERR-3 ERR-4 2014300400040 MEV B B PER-CENT PER-CENT PER-CENT 2014300400041 PER-CENT PER-CENT 2014300400042 2.5300E-08 7.419E+02 3.4 0.20 0.16 0.26 2014300400043 0.15 0.15 2014300400044 ENDDATA 6 0 2014300400045 ENDSUBENT 44 0 2014300499999 SUBENT 20143005 20160725 22522014300500001 BIB 4 4 2014300500002 REACTION (94-PU-239(N,F),,ARE) 2014300500003 PART-DET (FF) Fission fragments 2014300500004 STATUS (TABLE) From p.319 in ref ANE,1,311 2014300500005 ERR-ANALYS (DATA-ERR) No information given 2014300500006 ENDBIB 4 0 2014300500007 NOCOMMON 0 0 2014300500008 DATA 4 1 2014300500009 EN-RES-MAX EN-RES-MIN DATA DATA-ERR 2014300500010 MEV MEV B*EV B*EV 2014300500011 6.0010E-08 2.0010E-08 2.5150E+01 1.3000E-01 2014300500012 ENDDATA 3 0 2014300500013 ENDSUBENT 12 0 2014300599999 SUBENT 20143006 20160725 22522014300600001 BIB 4 4 2014300600002 REACTION (94-PU-239(N,F),,SIG) 2014300600003 STATUS (TABLE) Data from private communication of Wagemans. 2014300600004 HISTORY (19800530A) G.C. Added data set. 2014300600005 ERR-ANALYS (DATA-ERR) No details given. 2014300600006 ENDBIB 4 0 2014300600007 NOCOMMON 0 0 2014300600008 DATA 3 33 2014300600009 EN DATA DATA-ERR 2014300600010 EV B B 2014300600011 8.6000E-03 1.2664E+03 2.9000E+01 2014300600012 8.9000E-03 1.2346E+03 2.9000E+01 2014300600013 9.3000E-03 1.2077E+03 2.6000E+01 2014300600014 9.7000E-03 1.1880E+03 2.7000E+01 2014300600015 1.0200E-02 1.1100E+03 2.4000E+01 2014300600016 1.0600E-02 1.1681E+03 2.3000E+01 2014300600017 1.1100E-02 1.0591E+03 1.9300E+01 2014300600018 1.1700E-02 1.0008E+03 1.7100E+01 2014300600019 1.2200E-02 1.0476E+03 1.6400E+01 2014300600020 1.2900E-02 1.0287E+03 1.5300E+01 2014300600021 1.3500E-02 1.0035E+03 1.3900E+01 2014300600022 1.4300E-02 9.9008E+02 1.3400E+01 2014300600023 1.5000E-02 9.4833E+02 1.2600E+01 2014300600024 1.5900E-02 8.9903E+02 1.2000E+01 2014300600025 1.6800E-02 8.9225E+02 1.1500E+01 2014300600026 1.7800E-02 8.0540E+02 1.0000E+01 2014300600027 1.8900E-02 8.4739E+02 9.2000E+00 2014300600028 2.0100E-02 8.1095E+02 8.0000E+00 2014300600029 2.1500E-02 8.0019E+02 7.5000E+00 2014300600030 2.2900E-02 7.6804E+02 6.8000E+00 2014300600031 2.4500E-02 7.4413E+02 6.5000E+00 2014300600032 2.6300E-02 7.3021E+02 6.1000E+00 2014300600033 2.8300E-02 7.0991E+02 5.6000E+00 2014300600034 3.0500E-02 6.8331E+02 5.2000E+00 2014300600035 3.3000E-02 6.5816E+02 5.0000E+00 2014300600036 3.5900E-02 6.3415E+02 4.6000E+00 2014300600037 3.9100E-02 6.1509E+02 4.4000E+00 2014300600038 4.2700E-02 5.9708E+02 4.2000E+00 2014300600039 4.6800E-02 5.6194E+02 3.8000E+00 2014300600040 5.1700E-02 5.4487E+02 3.7000E+00 2014300600041 5.7300E-02 5.2595E+02 3.4000E+00 2014300600042 6.3900E-02 5.0848E+02 3.3000E+00 2014300600043 7.1700E-02 4.9327E+02 3.3000E+00 2014300600044 ENDDATA 35 0 2014300600045 ENDSUBENT 44 0 2014300699999 ENDENTRY 6 0 2014399999999