ENTRY 20364 20071219 21902036400000001 SUBENT 20364001 20071219 21902036400100001 BIB 13 65 2036400100002 INSTITUTE (2GERKFK) 2036400100003 REFERENCE (J,NSE,51,124,197306) Main reference 2036400100004 (R,KFK-1227,1972) Similar to main ref. Final paper. 2036400100005 (C,70HELSINKI,2,77,197006) Prel.Sample masses, 2036400100006 superseded 2036400100007 AUTHOR (F.Kaeppeler, E.Pfletschinger) 2036400100008 TITLE -A measurement of the fission cross section of 2036400100009 plutonium-241 relative to uranium-235.- 2036400100010 FACILITY (VDG) Karlsruhe 3 MV pulsed Van de Graaff 2036400100011 accelerator,pulse width 1 nsec, repetition Rate 1 MHz 2036400100012 INC-SOURCE (P-LI7) Proton-lithium 7. 2036400100013 SAMPLE .U or Pu acetate electrosprayed onto 90 micro-g/cm2 2036400100014 VYNS foils (85 pc. Pvc, 15 pc. Polyvinyl acetate), 2036400100015 metallized with 30 micro-g/cm2 Al. Sample diam. 5 cm. 2036400100016 . U sample masses Pu sample masses 2036400100017 2.315 milli-g +- 1.0 pc. 0.438 milli-g +- 1.8 pc. 2036400100018 *2.073 milli-g +- 1.0 pc. *0.471 milli-g +- 1.8 pc. 2036400100019 *2.002 milli-g +- 1.0 pc. 0.468 milli-g +- 1.8 pc. 2036400100020 0.513 milli-g +- 1.8 pc. 2036400100021 * Samples for quantitative measurements (the others 2036400100022 served only to get data for corrections). 2036400100023 .Isotopic composition 2036400100024 U samples Pu samples 2036400100025 U-234 0.169 at.-Pc. Pu-239 1.83 at.-Pc.2036400100026 U-235 99.499+-0.05at.-Pc. Pu-240 7.25 at.-Pc.2036400100027 U-236 0.027 at.-Pc. Pu-241 89.50+-0.08at.-Pc.2036400100028 U-238 0.353 at.-Pc. Pu-242 1.42 at.-Pc.2036400100029 Am-241 6.94+-1.4 at.-Pc.2036400100030 .Final mass values used. Communication from author. 2036400100031 METHOD (TOF) Time of flight, path = 37.7 cm, 2036400100032 time resolution 9 nsec/m below 300 keV and 1.4 nsec/m 2036400100033 at higher energies. 2036400100034 DETECTOR (SCIN) 2 identical argon-filled gas scintillation 2036400100035 chambers containing samples of Pu-241 and U-235. 2036400100036 .Good discrimination against alpha-background by 2036400100037 coincidence. 2036400100038 STATUS .Taken from nucl.Sci.Eng.,51(1973)124. 2036400100039 CORRECTION .Corrected for finite foil and backing thickness, dead 2036400100040 time, fission counts from Am-241 and other impurities.2036400100041 ERR-ANALYS .Error sources considered and uncertainty estimates 2036400100042 are : 2036400100043 (ERR-SYS) The energy-independent error of 2.75 pc. 2036400100044 Resulting from these errors must be combined 2036400100045 with the statistical errors given to obtain the total 2036400100046 uncertainties. 2036400100047 (ERR-1) Error due to correction for (N,g) background 2036400100048 for U-235 0.4% 2036400100049 (ERR-2) Error due to absorption losses in the U-235 2036400100050 samples 1.2% 2036400100051 (ERR-3) Error due to absorption losses in the Pu-241 2036400100052 samples 1.0% 2036400100053 (ERR-4) Error due to electronic threshold correction 2036400100054 for U-235 0.1% 2036400100055 (ERR-5) Error due to electronic threshold correction 2036400100056 for Pu-241 0.2% 2036400100057 (ERR-6) Error due to sample mass of U-235 1.0% 2036400100058 (ERR-7) Error due to sample mass of Pu-241 1.8% 2036400100059 (ERR-8) Error due to asymmetry in neutron flux 0.8% 2036400100060 HISTORY (19710813C) Preliminary values compiled. 2036400100061 (19721003A) Superseded by revised values. 2036400100062 (19740929E) 2036400100063 composition 2036400100064 (20071219A) Date corrected to 4-digit year 2036400100065 errors specified after N.Ohtsuka comments - SM 2036400100066 (20071219U) Last checking has been done. 2036400100067 ENDBIB 65 0 2036400100068 COMMON 9 6 2036400100069 ERR-SYS ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 2036400100070 ERR-6 ERR-7 ERR-8 2036400100071 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2036400100072 PER-CENT PER-CENT PER-CENT 2036400100073 2.75 0.4 1.2 1. 0.1 0.22036400100074 1.0 1.8 0.8 2036400100075 ENDCOMMON 6 0 2036400100076 ENDSUBENT 75 0 2036400199999 SUBENT 20364002 20071219 21902036400200001 BIB 4 6 2036400200002 REACTION ((94-PU-241(N,F),,SIG)/ 2036400200003 (92-U-235(N,F),,SIG)) 2036400200004 PART-DET (FF) Fission fragments. 2036400200005 COMMENT .Results after final mass determination. 2036400200006 HISTORY (20071219A) DATA-ERR changed to ERR-S 2036400200007 (20071219U) Last checking has been done. 2036400200008 ENDBIB 6 0 2036400200009 NOCOMMON 0 0 2036400200010 DATA 5 43 2036400200011 EN EN-RSL EN-RSL DATA ERR-S 2036400200012 MEV PER-CENT MEV NO-DIM PER-CENT 2036400200013 1.3700E-02 1.0000E+01 1.2520E+00 3.0 2036400200014 1.5700E-02 1.0000E+01 1.2770E+00 2.7 2036400200015 1.7600E-02 1.0000E+01 1.3180E+00 2.5 2036400200016 1.9500E-02 1.0000E+01 1.2050E+00 2.4 2036400200017 2.1500E-02 1.0000E+01 1.3060E+00 2.3 2036400200018 2.3900E-02 1.0000E+01 1.2220E+00 1.8 2036400200019 2.6800E-02 1.0000E+01 1.3430E+00 1.7 2036400200020 2.9700E-02 1.0000E+01 1.2580E+00 1.6 2036400200021 3.2500E-02 1.0000E+01 1.2430E+00 1.7 2036400200022 3.5400E-02 1.0000E+01 1.2410E+00 1.6 2036400200023 3.8900E-02 1.0000E+01 1.2790E+00 1.5 2036400200024 4.2700E-02 1.0000E+01 1.2900E+00 1.4 2036400200025 4.6700E-02 1.0000E+01 1.2800E+00 1.3 2036400200026 5.1700E-02 1.0000E+01 1.2410E+00 1.3 2036400200027 5.6900E-02 1.0000E+01 1.2380E+00 1.3 2036400200028 6.3200E-02 1.0000E+01 1.2250E+00 1.2 2036400200029 6.9800E-02 1.0000E+01 1.3050E+00 1.3 2036400200030 7.7400E-02 1.0000E+01 1.3140E+00 1.3 2036400200031 8.4600E-02 1.0000E+01 1.3060E+00 1.4 2036400200032 9.3600E-02 1.0000E+01 1.3120E+00 1.2 2036400200033 1.0380E-01 1.0000E+01 1.3380E+00 1.2 2036400200034 1.1350E-01 1.0000E+01 1.3450E+00 1.3 2036400200035 1.2520E-01 1.0000E+01 1.3730E+00 1.4 2036400200036 1.3730E-01 1.0000E+01 1.3530E+00 1.5 2036400200037 1.5110E-01 1.0000E+01 1.3370E+00 1.6 2036400200038 1.6690E-01 1.0000E+01 1.3600E+00 1.7 2036400200039 1.9200E-01 1.6000E-02 1.3820E+00 1.8 2036400200040 2.3000E-01 1.9000E-02 1.3600E+00 1.4 2036400200041 2.7300E-01 2.0000E-02 1.3960E+00 1.5 2036400200042 3.2400E-01 2.9000E-02 1.3800E+00 1.9 2036400200043 3.8800E-01 1.8000E-02 1.2610E+00 1.7 2036400200044 4.3600E-01 2.2000E-02 1.2570E+00 1.6 2036400200045 4.8600E-01 2.5000E-02 1.3150E+00 1.4 2036400200046 5.3500E-01 3.2000E-02 1.3050E+00 0.9 2036400200047 5.8400E-01 2.3000E-02 1.2650E+00 1.1 2036400200048 6.3300E-01 2.9000E-02 1.3200E+00 1.5 2036400200049 6.7800E-01 3.3000E-02 1.2870E+00 1.3 2036400200050 7.4000E-01 3.1000E-02 1.3530E+00 1.8 2036400200051 7.9000E-01 3.8000E-02 1.3200E+00 1.9 2036400200052 8.7000E-01 3.2000E-02 1.3200E+00 1.7 2036400200053 9.4500E-01 4.0000E-02 1.2290E+00 1.7 2036400200054 1.0350E+00 4.0000E-02 1.2630E+00 2.1 2036400200055 1.1330E+00 4.9000E-02 1.2670E+00 2.1 2036400200056 ENDDATA 45 0 2036400200057 ENDSUBENT 56 0 2036400299999 ENDENTRY 2 0 2036499999999