ENTRY 10647 20080815 13491064700000001 SUBENT 10647001 20080815 13491064700100001 BIB 14 35 1064700100002 INSTITUTE (1USALRL) 1064700100003 REFERENCE (J,NSE,80,393,1982) 1064700100004 AUTHOR (J.W.Behrens,J.C.Browne,J.C.Walden) 1064700100005 TITLE Measurement of the Neutron-Induced Fission Cross 1064700100006 Section of 237Np Relative to 235U from 0.02 to 30 MeV 1064700100007 FACILITY (LINAC,1USALRL) 100-MeV Linear Accelerator 1064700100008 INC-SOURCE (PHOTO) Photoneutrons from water-cooled tantalum target1064700100009 INC-SPECT Typical energy resolutoons at ~3% at 1 MeV and 6% at 1064700100010 20 MeV. 1064700100011 SAMPLE Two fission chambers: a Np sample enriched to at least 1064700100012 99.86% 237Np, and a U sample enriched to 99.91% 235U. 1064700100013 METHOD (TOF) Time-of-flight 1064700100014 Ratios normalized using threshold method with three 1064700100015 samples: the 235U and 237Np chambers plus a chamber 1064700100016 containing a mixture of the 2 isotopes (66.75% 235U 1064700100017 and 33.25% 237Np). 1064700100018 DETECTOR (IOCH) Low mass, parallel plate ionization fission 1064700100019 chambers. 1064700100020 CORRECTION Data corrected for time independent background, flux 1064700100021 perturbation, multiple scattering, sample impurities, 1064700100022 and deadtime between detectors. 1064700100023 ERR-ANALYS (ERR-S) Statistical errors. 1064700100024 (ERR-T) Total uncertainty; one standard deviation RMS 1064700100025 sum of statistical errors, systematic error, and 1064700100026 normalization error. 1064700100027 Systematic uncertainty varies from 0.4% at 1.75 MeV 1064700100028 to 1.3% at 20 MeV. 1064700100029 (MONIT-ERR) Normalization uncertainty. 1064700100030 Uncertainty in energy scale is 3.5 keV at 1 MeV and 1064700100031 0.31 MeV at 20 MeV. 1064700100032 See reference for a detailed discussion of errors. 1064700100033 STATUS (APRVD) Approved by author 1977/6/20 1064700100034 HISTORY (19770307C) 1064700100035 (19820929A) Updated reference, Authors,BIB correction. 1064700100036 (20080815A) Converted to new date formats, lower case. 1064700100037 ENDBIB 35 0 1064700100038 NOCOMMON 0 0 1064700100039 ENDSUBENT 38 0 1064700199999 SUBENT 10647002 20080815 13491064700200001 BIB 4 5 1064700200002 REACTION ((93-NP-237(N,F),,SIG)/(92-U-235(N,F),,SIG)) 1064700200003 MONITOR ((93-NP-237(N,F),,SIG,,AV)/(92-U-235(N,F),,SIG,,AV)) 1064700200004 STATUS (TABLE) Data taken from Table I in UCID-17370 (1977). 1064700200005 HISTORY (19820929A) Removed STATUS, added errors. 1064700200006 (20080815A) Added new STATUS entry, monitor. 1064700200007 ENDBIB 5 0 1064700200008 COMMON 4 3 1064700200009 EN-NRM-MIN EN-NRM-MAX MONIT MONIT-ERR 1064700200010 MEV MEV NO-DIM PER-CENT 1064700200011 1.75 4.00 1.294 1.6 1064700200012 ENDCOMMON 3 0 1064700200013 DATA 4 129 1064700200014 EN DATA ERR-S ERR-T 1064700200015 MEV NO-DIM PER-CENT PER-CENT 1064700200016 0.02215 0.0066 18.2 18.3 1064700200017 0.02955 0.0045 23.7 23.8 1064700200018 0.04139 0.0076 11.7 11.9 1064700200019 0.05565 0.0080 11.1 11.3 1064700200020 0.06969 0.0092 9.1 9.3 1064700200021 0.08980 0.0113 6.9 7.2 1064700200022 0.1112 0.0120 7.4 7.6 1064700200023 0.1300 0.0148 5.5 5.8 1064700200024 0.1540 0.0187 4.6 4.9 1064700200025 0.1767 0.0226 4.9 5.2 1064700200026 0.1948 0.0226 4.6 4.9 1064700200027 0.2157 0.0250 4.1 4.5 1064700200028 0.2402 0.0294 3.4 3.8 1064700200029 0.2691 0.0389 2.7 3.2 1064700200030 0.2944 0.0489 3.1 3.6 1064700200031 0.3132 0.0606 2.6 3.1 1064700200032 0.3340 0.0706 2.2 2.8 1064700200033 0.3569 0.0919 2.1 2.7 1064700200034 0.3822 0.1181 1.6 2.3 1064700200035 0.4030 0.1510 2.0 2.6 1064700200036 0.4178 0.1802 1.9 2.6 1064700200037 0.4334 0.2223 1.7 2.4 1064700200038 0.4500 0.2531 1.5 2.3 1064700200039 0.4675 0.3070 1.2 2.1 1064700200040 0.4861 0.3692 1.1 2.0 1064700200041 0.5058 0.4121 1.0 2.0 1064700200042 0.5267 0.4704 1.0 2.0 1064700200043 0.5489 0.5188 0.9 1.9 1064700200044 0.5726 0.5983 0.8 1.9 1064700200045 0.5913 0.6508 1.1 2.0 1064700200046 0.6044 0.7006 1.0 2.0 1064700200047 0.6178 0.7422 1.0 2.0 1064700200048 0.6318 0.7637 1.0 2.0 1064700200049 0.6462 0.8030 1.0 2.0 1064700200050 0.6611 0.8536 0.9 1.9 1064700200051 0.6765 0.8829 0.9 1.9 1064700200052 0.6925 0.9194 0.9 1.9 1064700200053 0.7090 0.9616 0.8 1.9 1064700200054 0.7261 0.9577 0.9 1.9 1064700200055 0.7439 1.017 0.8 1.9 1064700200056 0.7623 1.053 0.8 1.9 1064700200057 0.7815 1.078 0.8 1.9 1064700200058 0.8013 1.092 0.8 1.9 1064700200059 0.8219 1.118 0.8 1.9 1064700200060 0.8434 1.129 0.7 1.8 1064700200061 0.8656 1.153 0.7 1.8 1064700200062 0.8888 1.153 0.7 1.8 1064700200063 0.9129 1.152 0.7 1.8 1064700200064 0.9380 1.169 0.7 1.8 1064700200065 0.9642 1.154 0.7 1.8 1064700200066 0.9915 1.164 0.7 1.8 1064700200067 1.020 1.194 0.7 1.8 1064700200068 1.050 1.179 0.7 1.8 1064700200069 1.081 1.199 0.6 1.8 1064700200070 1.113 1.189 0.6 1.8 1064700200071 1.147 1.180 0.6 1.8 1064700200072 1.182 1.199 0.6 1.8 1064700200073 1.219 1.219 0.6 1.8 1064700200074 1.258 1.209 0.6 1.8 1064700200075 1.299 1.231 0.6 1.8 1064700200076 1.342 1.222 0.6 1.8 1064700200077 1.387 1.237 0.6 1.8 1064700200078 1.434 1.259 0.6 1.8 1064700200079 1.484 1.251 0.6 1.8 1064700200080 1.536 1.244 0.6 1.8 1064700200081 1.591 1.252 0.6 1.8 1064700200082 1.650 1.265 0.7 1.8 1064700200083 1.711 1.245 0.7 1.8 1064700200084 1.776 1.252 0.7 1.8 1064700200085 1.845 1.254 0.7 1.8 1064700200086 1.918 1.285 0.7 1.8 1064700200087 1.995 1.273 0.7 1.8 1064700200088 2.077 1.270 0.7 1.8 1064700200089 2.164 1.266 0.7 1.8 1064700200090 2.257 1.263 0.8 1.8 1064700200091 2.356 1.271 0.8 1.8 1064700200092 2.461 1.285 0.8 1.8 1064700200093 2.574 1.282 0.8 1.8 1064700200094 2.695 1.270 0.8 1.8 1064700200095 2.824 1.313 0.9 1.9 1064700200096 2.963 1.323 0.9 1.9 1064700200097 3.112 1.291 0.9 1.9 1064700200098 3.274 1.309 0.9 1.9 1064700200099 3.448 1.310 1.0 1.9 1064700200100 3.636 1.305 1.0 1.9 1064700200101 3.840 1.333 1.0 1.9 1064700200102 4.062 1.312 1.0 2.0 1064700200103 4.304 1.321 1.0 2.0 1064700200104 4.568 1.309 1.0 2.0 1064700200105 4.857 1.284 1.0 2.0 1064700200106 5.093 1.309 1.3 2.2 1064700200107 5.259 1.348 1.3 2.2 1064700200108 5.434 1.357 1.3 2.2 1064700200109 5.618 1.415 1.3 2.2 1064700200110 5.812 1.413 1.2 2.1 1064700200111 6.015 1.446 1.2 2.1 1064700200112 6.230 1.374 1.1 2.1 1064700200113 6.456 1.296 1.1 2.1 1064700200114 6.695 1.302 1.1 2.1 1064700200115 6.947 1.244 1.1 2.1 1064700200116 7.214 1.247 1.1 2.1 1064700200117 7.497 1.227 1.1 2.1 1064700200118 7.796 1.221 1.1 2.1 1064700200119 8.114 1.218 1.1 2.1 1064700200120 8.453 1.199 1.1 2.1 1064700200121 8.812 1.210 1.2 2.2 1064700200122 9.196 1.130 1.3 2.2 1064700200123 9.605 1.150 1.3 2.2 1064700200124 10.04 1.136 1.4 2.3 1064700200125 10.51 1.141 1.5 2.4 1064700200126 11.01 1.155 1.6 2.4 1064700200127 11.55 1.142 1.7 2.5 1064700200128 12.13 1.138 1.7 2.5 1064700200129 12.75 1.061 1.8 2.6 1064700200130 13.43 1.044 1.8 2.6 1064700200131 14.16 0.9897 1.9 2.6 1064700200132 14.95 0.9817 2.0 2.7 1064700200133 15.81 0.9908 2.1 2.9 1064700200134 16.74 1.047 2.2 2.9 1064700200135 17.77 1.025 2.3 3.0 1064700200136 18.89 1.057 2.5 3.2 1064700200137 20.12 1.041 2.7 3.4 1064700200138 21.48 1.004 2.8 3.5 1064700200139 22.98 1.006 3.0 3.6 1064700200140 24.65 1.049 3.2 3.8 1064700200141 26.51 1.036 3.4 4.0 1064700200142 28.59 0.9681 3.7 4.2 1064700200143 30.93 1.047 3.8 4.3 1064700200144 33.57 1.028 4.1 4.6 1064700200145 ENDDATA 131 0 1064700200146 ENDSUBENT 145 0 1064700299999 ENDENTRY 2 0 1064799999999