ENTRY 10647 20240229 1064700000001 SUBENT 10647001 20240229 20240513 1064700100001 BIB 12 26 1064700100002 TITLE Measurement of the neutron-induced fission cross 1064700100003 section of neptunium-237 relative to uranium-235 from 1064700100004 20 keV to 30 MeV 1064700100005 AUTHOR (J.W.Behrens, J.C.Browne, J.C.Walden) 1064700100006 INSTITUTE (1USALRL) 1064700100007 REFERENCE (J,NSE,80,393,1982) 1064700100008 FACILITY (LINAC,1USALRL) 100-MeV electron linear accelerator 1064700100009 INC-SOURCE (PHOTO) Photoneutrons from water-cooled tantalum target1064700100010 INC-SPECT Typical energy resolutions of ~3% at 1 MeV and 6% at 1064700100011 20 MeV 1064700100012 DETECTOR (FISCH) Low mass, parallel plate ionization fission 1064700100013 chambers. 1064700100014 METHOD (TOF) 15.7 m flight path length. 1064700100015 Photofission induced by gamma flash used as main 1064700100016 timing reference. 1064700100017 CORRECTION Data corrected for 1064700100018 . time independent background 1064700100019 . flux perturbation 1064700100020 . multiple scattering 1064700100021 . sample impurities 1064700100022 . deadtime between detectors. 1064700100023 STATUS (APRVD) Approved by author 1977/6/20 1064700100024 HISTORY (19770307C) 1064700100025 (19820929A) Updated reference, Authors,BIB correction. 1064700100026 (20080815A) Converted to new date formats, lower case. 1064700100027 (20240229A) VT. Major revision in 002. 003 created. 1064700100028 ENDBIB 26 0 1064700100029 NOCOMMON 0 0 1064700100030 ENDSUBENT 29 0 1064700199999 SUBENT 10647002 20240227 20240513 1064700200001 BIB 6 14 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 SAMPLE . 237Np sample (60 mg, 0.19 mg/cm2, >99.86% enrichment1064700200005 . 235U sample (150 mg, 0.19 mg/cm2, 99.91% enrichment)1064700200006 ERR-ANALYS (ERR-T) One standard deviation RMS sum of 1064700200007 (ERR-S) Statistical uncertainty 1064700200008 (ERR-SYS) Systematic uncertainty 1064700200009 (MONIT-ERR) Normalization uncertainty 1064700200010 STATUS (TABLE,,J.W.Behrens+,J,NSE,80,393,1982) Table IV 1064700200011 (DEP,10647003) Ratio determined by the 1064700200012 threshold cross-section method 1064700200013 HISTORY (19820929A) Removed STATUS, added errors. 1064700200014 (20080815A) Added new STATUS entry, monitor. 1064700200015 (20240229A) VT. ERR-SYS added. Numerical data checked. 1064700200016 ENDBIB 14 0 1064700200017 COMMON 4 3 1064700200018 EN-NRM-MIN EN-NRM-MAX MONIT MONIT-ERR 1064700200019 MEV MEV NO-DIM PER-CENT 1064700200020 1.75 4.00 1.294 1.6 1064700200021 ENDCOMMON 3 0 1064700200022 DATA 5 129 1064700200023 EN DATA ERR-S ERR-T ERR-SYS 1064700200024 MEV NO-DIM PER-CENT PER-CENT PER-CENT 1064700200025 0.02215 0.0066 18.2 18.3 1.1 1064700200026 0.02955 0.0045 23.7 23.8 1.1 1064700200027 0.04139 0.0076 11.7 11.9 1.1 1064700200028 0.05565 0.0080 11.1 11.3 1.1 1064700200029 0.06969 0.0092 9.1 9.3 1.1 1064700200030 0.08980 0.0113 6.9 7.2 1.1 1064700200031 0.1112 0.0120 7.4 7.6 0.7 1064700200032 0.1300 0.0148 5.5 5.8 0.7 1064700200033 0.1540 0.0187 4.6 4.9 0.7 1064700200034 0.1767 0.0226 4.9 5.2 0.7 1064700200035 0.1948 0.0226 4.6 4.9 0.7 1064700200036 0.2157 0.0250 4.1 4.5 0.7 1064700200037 0.2402 0.0294 3.4 3.8 0.7 1064700200038 0.2691 0.0389 2.7 3.2 0.7 1064700200039 0.2944 0.0489 3.1 3.6 0.7 1064700200040 0.3132 0.0606 2.6 3.1 0.6 1064700200041 0.3340 0.0706 2.2 2.8 0.6 1064700200042 0.3569 0.0919 2.1 2.7 0.6 1064700200043 0.3822 0.1181 1.6 2.3 0.6 1064700200044 0.4030 0.1510 2.0 2.6 0.6 1064700200045 0.4178 0.1802 1.9 2.6 0.6 1064700200046 0.4334 0.2223 1.7 2.4 0.6 1064700200047 0.4500 0.2531 1.5 2.3 0.6 1064700200048 0.4675 0.3070 1.2 2.1 0.6 1064700200049 0.4861 0.3692 1.1 2.0 0.6 1064700200050 0.5058 0.4121 1.0 2.0 0.5 1064700200051 0.5267 0.4704 1.0 2.0 0.5 1064700200052 0.5489 0.5188 0.9 1.9 0.5 1064700200053 0.5726 0.5983 0.8 1.9 0.5 1064700200054 0.5913 0.6508 1.1 2.0 0.5 1064700200055 0.6044 0.7006 1.0 2.0 0.5 1064700200056 0.6178 0.7422 1.0 2.0 0.5 1064700200057 0.6318 0.7637 1.0 2.0 0.5 1064700200058 0.6462 0.8030 1.0 2.0 0.5 1064700200059 0.6611 0.8536 0.9 1.9 0.5 1064700200060 0.6765 0.8829 0.9 1.9 0.5 1064700200061 0.6925 0.9194 0.9 1.9 0.5 1064700200062 0.7090 0.9616 0.8 1.9 0.5 1064700200063 0.7261 0.9577 0.9 1.9 0.5 1064700200064 0.7439 1.017 0.8 1.9 0.5 1064700200065 0.7623 1.053 0.8 1.9 0.5 1064700200066 0.7815 1.078 0.8 1.9 0.5 1064700200067 0.8013 1.092 0.8 1.9 0.5 1064700200068 0.8219 1.118 0.8 1.9 0.5 1064700200069 0.8434 1.129 0.7 1.8 0.5 1064700200070 0.8656 1.153 0.7 1.8 0.5 1064700200071 0.8888 1.153 0.7 1.8 0.5 1064700200072 0.9129 1.152 0.7 1.8 0.5 1064700200073 0.9380 1.169 0.7 1.8 0.5 1064700200074 0.9642 1.154 0.7 1.8 0.5 1064700200075 0.9915 1.164 0.7 1.8 0.5 1064700200076 1.020 1.194 0.7 1.8 0.5 1064700200077 1.050 1.179 0.7 1.8 0.5 1064700200078 1.081 1.199 0.6 1.8 0.5 1064700200079 1.113 1.189 0.6 1.8 0.5 1064700200080 1.147 1.180 0.6 1.8 0.5 1064700200081 1.182 1.199 0.6 1.8 0.5 1064700200082 1.219 1.219 0.6 1.8 0.5 1064700200083 1.258 1.209 0.6 1.8 0.5 1064700200084 1.299 1.231 0.6 1.8 0.5 1064700200085 1.342 1.222 0.6 1.8 0.5 1064700200086 1.387 1.237 0.6 1.8 0.5 1064700200087 1.434 1.259 0.6 1.8 0.5 1064700200088 1.484 1.251 0.6 1.8 0.5 1064700200089 1.536 1.244 0.6 1.8 0.5 1064700200090 1.591 1.252 0.6 1.8 0.5 1064700200091 1.650 1.265 0.7 1.8 0.5 1064700200092 1.711 1.245 0.7 1.8 0.5 1064700200093 1.776 1.252 0.7 1.8 0.4 1064700200094 1.845 1.254 0.7 1.8 0.4 1064700200095 1.918 1.285 0.7 1.8 0.4 1064700200096 1.995 1.273 0.7 1.8 0.4 1064700200097 2.077 1.270 0.7 1.8 0.4 1064700200098 2.164 1.266 0.7 1.8 0.4 1064700200099 2.257 1.263 0.8 1.8 0.4 1064700200100 2.356 1.271 0.8 1.8 0.4 1064700200101 2.461 1.285 0.8 1.8 0.4 1064700200102 2.574 1.282 0.8 1.8 0.4 1064700200103 2.695 1.270 0.8 1.8 0.4 1064700200104 2.824 1.313 0.9 1.9 0.4 1064700200105 2.963 1.323 0.9 1.9 0.4 1064700200106 3.112 1.291 0.9 1.9 0.4 1064700200107 3.274 1.309 0.9 1.9 0.4 1064700200108 3.448 1.310 1.0 1.9 0.4 1064700200109 3.636 1.305 1.0 1.9 0.4 1064700200110 3.840 1.333 1.0 1.9 0.4 1064700200111 4.062 1.312 1.0 2.0 0.7 1064700200112 4.304 1.321 1.0 2.0 0.7 1064700200113 4.568 1.309 1.0 2.0 0.7 1064700200114 4.857 1.284 1.0 2.0 0.7 1064700200115 5.093 1.309 1.3 2.2 0.7 1064700200116 5.259 1.348 1.3 2.2 0.7 1064700200117 5.434 1.357 1.3 2.2 0.7 1064700200118 5.618 1.415 1.3 2.2 0.7 1064700200119 5.812 1.413 1.2 2.1 0.7 1064700200120 6.015 1.446 1.2 2.1 0.7 1064700200121 6.230 1.374 1.1 2.1 0.7 1064700200122 6.456 1.296 1.1 2.1 0.7 1064700200123 6.695 1.302 1.1 2.1 0.7 1064700200124 6.947 1.244 1.1 2.1 0.7 1064700200125 7.214 1.247 1.1 2.1 0.9 1064700200126 7.497 1.227 1.1 2.1 0.9 1064700200127 7.796 1.221 1.1 2.1 0.9 1064700200128 8.114 1.218 1.1 2.1 0.9 1064700200129 8.453 1.199 1.1 2.1 0.9 1064700200130 8.812 1.210 1.2 2.2 0.9 1064700200131 9.196 1.130 1.3 2.2 0.9 1064700200132 9.605 1.150 1.3 2.2 0.9 1064700200133 10.04 1.136 1.4 2.3 0.9 1064700200134 10.51 1.141 1.5 2.4 0.9 1064700200135 11.01 1.155 1.6 2.4 0.9 1064700200136 11.55 1.142 1.7 2.5 0.9 1064700200137 12.13 1.138 1.7 2.5 0.9 1064700200138 12.75 1.061 1.8 2.6 0.9 1064700200139 13.43 1.044 1.8 2.6 0.9 1064700200140 14.16 0.9897 1.9 2.6 0.9 1064700200141 14.95 0.9817 2.0 2.7 0.9 1064700200142 15.81 0.9908 2.1 2.9 1.1 1064700200143 16.74 1.047 2.2 2.9 1.1 1064700200144 17.77 1.025 2.3 3.0 1.1 1064700200145 18.89 1.057 2.5 3.2 1.1 1064700200146 20.12 1.041 2.7 3.4 1.3 1064700200147 21.48 1.004 2.8 3.5 1.3 1064700200148 22.98 1.006 3.0 3.6 1.3 1064700200149 24.65 1.049 3.2 3.8 1.3 1064700200150 26.51 1.036 3.4 4.0 1.3 1064700200151 28.59 0.9681 3.7 4.2 1.3 1064700200152 30.93 1.047 3.8 4.3 1.3 1064700200153 33.57 1.028 4.1 4.6 1.3 1064700200154 ENDDATA 131 0 1064700200155 ENDSUBENT 154 0 1064700299999 SUBENT 10647003 20240229 20240513 1064700300001 BIB 6 12 1064700300002 REACTION ((93-NP-237(N,F),,SIG,,AV)/(92-U-235(N,F),,SIG,,AV)) 1064700300003 SAMPLE Mixture of 237Np and 235U (50 mg, 0.16 mg/cm2, 1064700300004 235U/237Np atom number ratio (eta)=2.007+/-0.020 1064700300005 determined by coulometry at LLNL) 1064700300006 METHOD Threshold cross-section method 1064700300007 ERR-ANALYS (ERR-1) Statistics in eta measurement 1064700300008 (ERR-2) Statistics in 237Np/235U count rate ratio 1064700300009 (ERR-3) Systematic error in eta measurement 1064700300010 (ERR-4) Systematic error in 237Np/235U count rate ratio1064700300011 (ERR-T) Total uncertainty 1064700300012 STATUS (TABLE,,J.W.Behrens+,J,NSE,80,393,1982) Table III 1064700300013 HISTORY (20240229C) VT 1064700300014 ENDBIB 12 0 1064700300015 COMMON 4 3 1064700300016 ERR-1 ERR-2 ERR-3 ERR-4 1064700300017 PER-CENT PER-CENT PER-CENT PER-CENT 1064700300018 0.37 1.11 0.94 0.61 1064700300019 ENDCOMMON 3 0 1064700300020 DATA 4 1 1064700300021 EN-MIN EN-MAX DATA ERR-T 1064700300022 MEV MEV NO-DIM PER-CENT 1064700300023 1.75 4.00 1.294 1.6 1064700300024 ENDDATA 3 0 1064700300025 ENDSUBENT 24 0 1064700399999 ENDENTRY 3 0 1064799999999