ENTRY 10652 20080818 13491065200000001 SUBENT 10652001 20080818 13491065200100001 BIB 13 36 1065200100002 INSTITUTE (1USALRL) 1065200100003 REFERENCE (J,NSE,77,444,198104) 1065200100004 (R,UCID-17324,197611) Preliminary 241Am data 1065200100005 AUTHOR (J.W.Behrens,J.C.Browne) 1065200100006 TITLE Measurement of the Neutron-Induced Fission Cross 1065200100007 Sections of 241Am and 243Am Relative to 235U from 0.2 1065200100008 to 30 MeV 1065200100009 FACILITY (LINAC,1USALRL) 100-MeV linear accelerator. 1065200100010 INC-SOURCE (PHOTO) Photoneutrons from water-cooled tantalum target1065200100011 INC-SPECT Typical energy resolutoons at ~3% at 1 MeV and 6% at 1065200100012 20 MeV. 1065200100013 METHOD (TOF) Time of flight with 15.7-meter flight path. 1065200100014 Photofission induced by gamma flash used as main 1065200100015 timing reference. Threshold cross section method used 1065200100016 which analyzes spectra from three fission chambers- 1065200100017 Am sample, 235U target, and a mixture of both. 1065200100018 DETECTOR (IOCH) Low mass, parallel plate ionization fission 1065200100019 chamber with foils perpendicular to beam. 1065200100020 CORRECTION Corrections made for time-independent backgrounds, 1065200100021 sample impurities, and timing errors of am fission 1065200100022 chamber relative to the 235U fission chamber 1065200100023 ERR-ANALYS (ERR-SYS) Total systematic uncertainty 1065200100024 (ERR-S) Statistical uncertainty 1065200100025 (ERR-T) Total uncertainty; one standard deviation RMS 1065200100026 sum of statistical errors, systematic error, and 1065200100027 threshold-method cross section error. 1065200100028 (MONIT-ERR) Normalization uncertainty. 1065200100029 Uncertainty in energy scale is 3.5 keV at 1 MeV and 1065200100030 0.31 MeV at 20 MeV. 1065200100031 See reference for a detailed discussion of errors. 1065200100032 STATUS (APRVD) Approved by J.W.Behrens, 1981/2/18. 1065200100033 HISTORY (19770315C) 1065200100034 (19801222A) REFERENCE update. 1065200100035 (19810514A) REFERENCE update. 1065200100036 (20080818A) Converted to new date formats, lower case. 1065200100037 BIB update. Error heading updated. Monitor added. 1065200100038 ENDBIB 36 0 1065200100039 NOCOMMON 0 0 1065200100040 ENDSUBENT 39 0 1065200199999 SUBENT 10652002 20080818 13491065200200001 BIB 4 7 1065200200002 REACTION ((95-AM-241(N,F),,SIG)/(92-U-235(N,F),,SIG)) 1065200200003 SAMPLE 4-mg americium sample, enriched to 99.19% 241Am. Areal 1065200200004 density 0.02 mg/cm2. 1065200200005 120 mg uranium sample enriched to 99.91% 235U, areal 1065200200006 density 0.26 mg/cm2. 1065200200007 MONITOR ((95-AM-241(N,F),,SIG,,AV)/(92-U-235(N,F),,SIG,,AV)) 1065200200008 HISTORY (19801222A) Data replaced. 1065200200009 ENDBIB 7 0 1065200200010 COMMON 4 3 1065200200011 EN-NRM-MIN EN-NRM-MAX MONIT MONIT-ERR 1065200200012 MEV MEV NO-DIM PER-CENT 1065200200013 1.75 4.00 1.648 2.8 1065200200014 ENDCOMMON 3 0 1065200200015 DATA 5 63 1065200200016 EN DATA ERR-SYS ERR-S ERR-T 1065200200017 MEV NO-DIM PER-CENT PER-CENT PER-CENT 1065200200018 0.2189 0.019 1.0 38.4 38.5 1065200200019 0.2438 0.019 1.0 31.4 31.5 1065200200020 0.2732 0.023 1.0 23.3 23.5 1065200200021 0.3084 0.031 0.8 15.2 15.5 1065200200022 0.3507 0.037 0.8 12.2 12.5 1065200200023 0.3885 0.045 0.8 12.3 12.6 1065200200024 0.4172 0.049 0.8 11.3 11.7 1065200200025 0.4492 0.0663 0.8 8.8 9.3 1065200200026 0.4850 0.0817 0.8 6.6 7.2 1065200200027 0.5200 0.0918 0.8 7.1 7.7 1065200200028 0.5530 0.1275 0.8 5.4 6.1 1065200200029 0.5894 0.1455 0.8 4.8 5.6 1065200200030 0.6294 0.1976 0.8 4.0 4.9 1065200200031 0.6660 0.2649 0.8 3.7 4.7 1065200200032 0.6976 0.3316 0.8 3.1 4.3 1065200200033 0.7315 0.3881 0.8 2.8 4.0 1065200200034 0.7679 0.5375 0.8 2.3 3.7 1065200200035 0.8072 0.6466 0.8 2.1 3.6 1065200200036 0.8495 0.7788 0.8 1.9 3.5 1065200200037 0.8952 0.8986 0.8 1.6 3.3 1065200200038 0.9447 0.9948 0.8 1.5 3.3 1065200200039 0.9985 1.128 0.8 1.4 3.2 1065200200040 1.057 1.240 1.1 1.3 3.3 1065200200041 1.121 1.422 1.1 1.2 3.2 1065200200042 1.191 1.513 1.1 1.2 3.2 1065200200043 1.267 1.594 1.1 1.2 3.2 1065200200044 1.351 1.606 1.1 1.1 3.2 1065200200045 1.444 1.557 1.1 1.2 3.2 1065200200046 1.546 1.603 1.1 1.1 3.2 1065200200047 1.660 1.610 1.1 1.2 3.2 1065200200048 1.788 1.576 1.2 1.2 3.3 1065200200049 1.930 1.572 1.2 1.2 3.3 1065200200050 2.069 1.604 1.2 1.5 3.4 1065200200051 2.200 1.563 1.2 1.5 3.4 1065200200052 2.345 1.638 1.2 1.6 3.4 1065200200053 2.504 1.614 1.2 1.7 3.5 1065200200054 2.679 1.628 1.2 1.8 3.5 1065200200055 2.874 1.612 1.2 1.9 3.6 1065200200056 3.092 1.634 1.2 1.9 3.6 1065200200057 3.334 1.676 1.2 2.0 3.6 1065200200058 3.607 1.733 1.2 2.0 3.6 1065200200059 3.915 1.757 1.2 2.1 3.7 1065200200060 4.263 1.825 1.3 2.0 3.7 1065200200061 4.661 1.833 1.3 2.1 3.7 1065200200062 5.117 1.872 1.3 2.0 3.7 1065200200063 5.644 1.835 1.3 2.0 3.7 1065200200064 6.148 1.625 1.3 2.2 3.8 1065200200065 6.601 1.509 1.3 2.1 3.7 1065200200066 7.107 1.504 1.4 2.0 3.7 1065200200067 7.674 1.457 1.4 2.1 3.8 1065200200068 8.311 1.567 1.4 2.1 3.8 1065200200069 9.032 1.575 1.4 2.3 3.9 1065200200070 9.851 1.569 1.4 2.6 4.1 1065200200071 10.79 1.579 1.6 2.9 4.3 1065200200072 11.87 1.504 1.6 3.3 4.6 1065200200073 13.11 1.360 1.6 3.6 4.8 1065200200074 14.57 1.311 1.6 4.0 5.1 1065200200075 16.29 1.371 1.6 4.5 5.5 1065200200076 18.34 1.281 1.6 5.3 6.2 1065200200077 20.80 1.279 1.8 6.1 6.9 1065200200078 23.80 1.295 1.8 7.2 7.9 1065200200079 27.50 1.486 1.8 7.7 8.4 1065200200080 32.16 1.225 1.8 10.3 10.4 1065200200081 ENDDATA 65 0 1065200200082 ENDSUBENT 81 0 1065200299999 SUBENT 10652003 20080818 13491065200300001 BIB 4 7 1065200300002 REACTION ((95-AM-243(N,F),,SIG)/(92-U-235(N,F),,SIG)) 1065200300003 SAMPLE Total mass of 15-milligrams, 99.83% 243Am, areal 1065200300004 density 0.06 mg/cm2. 1065200300005 120 mg uranium sample enriched to 99.91% 235U, areal 1065200300006 density 0.26 mg/cm2. 1065200300007 MONITOR ((95-AM-243(N,F),,SIG,,AV)/(92-U-235(N,F),,SIG,,AV)) 1065200300008 HISTORY (19801222C) 1065200300009 ENDBIB 7 0 1065200300010 COMMON 4 3 1065200300011 EN-NRM-MIN EN-NRM-MAX MONIT MONIT-ERR 1065200300012 MEV MEV NO-DIM PER-CENT 1065200300013 1.75 4.00 1.391 2.8 1065200300014 ENDCOMMON 3 0 1065200300015 DATA 5 63 1065200300016 EN DATA ERR-SYS ERR-S ERR-T 1065200300017 MEV NO-DIM PER-CENT PER-CENT PER-CENT 1065200300018 0.2395 0.0087 1.2 18.3 18.6 1065200300019 0.3226 0.0145 1.0 16.1 16.4 1065200300020 0.3684 0.0160 1.0 14.0 14.3 1065200300021 0.4248 0.0255 1.0 9.1 9.6 1065200300022 0.4951 0.0456 1.0 5.2 6.0 1065200300023 0.5600 0.0662 0.9 5.7 6.4 1065200300024 0.6107 0.0781 0.9 4.9 5.7 1065200300025 0.6685 0.1479 0.9 3.3 4.4 1065200300026 0.7349 0.2465 0.9 2.5 3.9 1065200300027 0.7915 0.3521 0.9 2.8 4.1 1065200300028 0.8329 0.4963 0.9 2.4 3.8 1065200300029 0.8777 0.6282 0.9 2.0 3.6 1065200300030 0.9261 0.8057 0.9 1.7 3.4 1065200300031 0.9787 0.9567 0.9 1.6 3.3 1065200300032 1.028 1.141 0.8 1.7 3.4 1065200300033 1.074 1.183 0.8 1.6 3.3 1065200300034 1.123 1.284 0.8 1.6 3.3 1065200300035 1.175 1.316 0.8 1.5 3.3 1065200300036 1.231 1.360 0.8 1.5 3.3 1065200300037 1.292 1.380 0.8 1.5 3.3 1065200300038 1.356 1.396 0.8 1.5 3.3 1065200300039 1.426 1.407 0.8 1.5 3.3 1065200300040 1.501 1.351 0.8 1.5 3.3 1065200300041 1.582 1.315 0.8 1.6 3.3 1065200300042 1.670 1.331 0.8 1.7 3.4 1065200300043 1.766 1.327 0.8 1.6 3.3 1065200300044 1.870 1.283 0.8 1.7 3.4 1065200300045 1.984 1.308 0.8 1.7 3.4 1065200300046 2.108 1.277 0.8 1.8 3.4 1065200300047 2.244 1.299 0.8 1.9 3.5 1065200300048 2.394 1.364 0.8 1.9 3.5 1065200300049 2.560 1.349 0.8 2.0 3.5 1065200300050 2.744 1.369 0.8 2.1 3.6 1065200300051 2.947 1.379 0.8 2.2 3.6 1065200300052 3.135 1.417 0.8 2.6 3.9 1065200300053 3.299 1.461 0.8 2.7 4.0 1065200300054 3.476 1.450 0.8 2.8 4.0 1065200300055 3.667 1.470 0.8 3.0 4.2 1065200300056 3.874 1.523 0.8 2.8 4.0 1065200300057 4.100 1.449 0.9 2.8 4.1 1065200300058 4.346 1.528 0.9 2.8 4.1 1065200300059 4.616 1.505 0.9 2.8 4.1 1065200300060 4.910 1.549 0.9 2.7 4.0 1065200300061 5.235 1.608 0.9 2.6 3.9 1065200300062 5.592 1.630 0.9 2.6 3.9 1065200300063 5.988 1.557 0.9 2.5 3.9 1065200300064 6.427 1.536 0.9 2.3 3.7 1065200300065 6.916 1.434 0.9 2.2 3.7 1065200300066 7.464 1.338 1.3 2.3 3.8 1065200300067 8.080 1.269 1.3 2.4 3.9 1065200300068 8.776 1.364 1.3 2.5 4.0 1065200300069 9.567 1.287 1.3 2.8 4.2 1065200300070 10.47 1.403 1.5 3.0 4.4 1065200300071 11.51 1.385 1.5 3.4 4.7 1065200300072 12.71 1.179 1.5 3.8 5.0 1065200300073 14.11 1.194 1.5 4.0 5.1 1065200300074 15.76 1.167 1.8 4.4 5.5 1065200300075 17.72 1.213 1.8 4.9 5.9 1065200300076 20.07 1.249 1.9 5.4 6.4 1065200300077 22.93 1.216 1.9 6.3 7.2 1065200300078 26.45 1.055 1.9 7.5 8.2 1065200300079 30.88 1.137 1.9 8.4 9.1 1065200300080 36.53 1.197 1.9 9.5 10.1 1065200300081 ENDDATA 65 0 1065200300082 ENDSUBENT 81 0 1065200399999 ENDENTRY 3 0 1065299999999