ENTRY 13576 20200925 14731357600000001 SUBENT 13576001 20200925 14731357600100001 BIB 12 31 1357600100002 TITLE Measurement of the subthreshold neutron-induced 1357600100003 fission cross section of 240Pu relative to 235U from 1357600100004 5 to 300 keV 1357600100005 AUTHOR (J.W.Behrens) 1357600100006 INSTITUTE (1USANBS,1USALRL) 1357600100007 REFERENCE (J,NSE,85,314,1983) 1357600100008 (J,NSE,66,433,1978) 1357600100009 Results from the same experiment with wider bins 1357600100010 (R,UCID-17047,1976) 1357600100011 Preliminary subthreshold data 1357600100012 FACILITY (LINAC,1USALRL) 100-MeV electron linear accelerator 1357600100013 INC-SOURCE (PHOTO) Electron beam on a thick water-cooled Ta target1357600100014 Repetition rate = 1440 Hz 1357600100015 Pulse width = 10 nsec 1357600100016 SAMPLE 25 mg 240Pu sample containing 0.80at.% 239Pu, 0.55at.% 1357600100017 241Pu and 0.17 at.% 242Pu impurities. 1357600100018 (92-U-235,ENR=0.9991) 1357600100019 95 mg uranium sample 1357600100020 DETECTOR (FISCH) Parallel-plate ionization chambers 1357600100021 METHOD (TOF) Flight path of 15.7 m, and time resolution of 1357600100022 ~12 nsec (~1 nsec/m) and minimum channel widths of 1357600100023 8 nsec. 1357600100024 The time resolution was determined by the resolution 1357600100025 of the fission detector (6 nsec) and neutron burst 1357600100026 width (10 nsec). 1357600100027 CORRECTION Corrected for 1357600100028 - time-independent backgrounds 1357600100029 - impurities in 240Pu sample 1357600100030 STATUS No reply to author proof 1357600100031 HISTORY (19920420A) Moved from data set 10597 1357600100032 (20200925A) On. Recompiled. 1357600100033 ENDBIB 31 0 1357600100034 NOCOMMON 0 0 1357600100035 ENDSUBENT 34 0 1357600199999 SUBENT 13576002 20200925 14731357600200001 BIB 6 15 1357600200002 REACTION ((94-PU-240(N,F),,SIG)/(92-U-235(N,F),,SIG)) 1357600200003 MONITOR ((94-PU-240(N,F),,SIG,,AV)/(92-U-235(N,F),,SIG,,AV)) 1357600200004 Derived from fission ratio of 238U/240PU and 238U/235U1357600200005 MONIT-REF (10597000,J.W.Behrens+,J,NSE,66,433,1978) 1357600200006 238U:240Pu ratio 1357600200007 (10653004,J.W.Behrens+,J,NSE,63,250,1977) 1357600200008 238U:235U ratio 1357600200009 ERR-ANALYS (ERR-T) Root-mean-square sum including 1357600200010 - time-independent background 1357600200011 - sample impurity 1357600200012 (ERR-S) - statistical error 1357600200013 (MONIT-ERR) - normalization 1357600200014 STATUS (TABLE) Table I of Nucl.Sci.Eng.85(1983)314 1357600200015 (COREL,10597002) Data from same work above 330 keV 1357600200016 HISTORY (20200925U) On. MONIT-REF added. EN -> EN-MIN/MAX. 1357600200017 ENDBIB 15 0 1357600200018 COMMON 5 3 1357600200019 EN-RSL EN-NRM-MIN EN-NRM-MAX MONIT MONIT-ERR 1357600200020 NSEC/M MEV MEV NO-DIM PER-CENT 1357600200021 1. 1.75 4.00 1.366 1.8 1357600200022 ENDCOMMON 3 0 1357600200023 DATA 5 82 1357600200024 EN-MIN EN-MAX DATA ERR-S ERR-T 1357600200025 KEV KEV NO-DIM PER-CENT PER-CENT 1357600200026 5.502 6.321 0.0260 32.2 32.3 1357600200027 6.321 7.338 0.0458 17.6 17.8 1357600200028 7.338 8.621 0.0435 17.7 17.9 1357600200029 8.621 10.27 0.0179 35.0 35.1 1357600200030 10.27 12.45 0.0216 26.4 26.5 1357600200031 12.45 15.40 0.0328 15.9 16.1 1357600200032 15.40 16.30 0.0106 89.4 89.4 1357600200033 16.30 17.28 0.0441 22.9 23.0 1357600200034 17.28 18.35 0.0271 30.9 31.0 1357600200035 18.35 19.53 0.0268 28.5 28.6 1357600200036 19.53 20.83 0.0842 10.5 10.8 1357600200037 20.83 22.25 0.0318 22.4 22.5 1357600200038 22.25 23.83 0.0201 32.7 32.8 1357600200039 23.83 25.59 0.0269 24.9 25.0 1357600200040 25.59 27.54 0.0368 23.0 23.1 1357600200041 27.54 29.73 0.0281 21.1 21.2 1357600200042 29.73 32.19 0.0318 16.9 17.1 1357600200043 32.19 34.97 0.0777 8.3 8.6 1357600200044 34.97 36.49 0.0667 13.0 13.2 1357600200045 36.49 38.12 0.0300 23.1 23.2 1357600200046 38.12 39.86 0.0574 11.4 11.6 1357600200047 39.86 41.72 0.0687 10.7 11.0 1357600200048 41.72 43.71 0.0454 17.9 18.1 1357600200049 43.71 45.85 0.0565 12.2 12.4 1357600200050 45.85 48.15 0.0600 12.1 12.3 1357600200051 48.15 50.63 0.0238 30.0 30.1 1357600200052 50.63 53.31 0.0181 27.8 27.9 1357600200053 53.31 56.20 0.0272 17.4 17.6 1357600200054 56.20 59.34 0.0325 14.1 14.3 1357600200055 59.34 62.74 0.0374 11.5 11.7 1357600200056 62.74 66.45 0.0473 9.4 9.7 1357600200057 66.45 70.50 0.0575 8.1 8.4 1357600200058 70.50 74.93 0.0427 9.8 10.1 1357600200059 74.93 79.79 0.0355 15.0 15.2 1357600200060 79.79 82.39 0.0581 11.1 11.3 1357600200061 82.39 85.13 0.0600 10.0 10.3 1357600200062 85.13 88.01 0.0596 10.3 10.6 1357600200063 88.01 91.04 0.0700 9.4 9.7 1357600200064 91.04 94.22 0.0399 13.9 14.1 1357600200065 94.22 97.57 0.0261 19.5 19.6 1357600200066 97.57 101.1 0.0223 20.9 21.0 1357600200067 101.1 104.8 0.0354 12.6 12.8 1357600200068 104.8 108.8 0.0475 9.3 9.6 1357600200069 108.8 113.0 0.0434 9.4 9.7 1357600200070 113.0 117.4 0.0406 10.0 10.3 1357600200071 117.4 122.0 0.0331 10.9 11.1 1357600200072 122.0 127.0 0.0492 7.6 8.0 1357600200073 127.0 132.3 0.0515 6.8 7.2 1357600200074 132.3 137.9 0.0610 5.8 6.3 1357600200075 137.9 143.9 0.0522 6.6 7.0 1357600200076 143.9 147.0 0.0487 9.1 9.4 1357600200077 147.0 150.2 0.0392 10.6 10.9 1357600200078 150.2 153.6 0.0526 8.4 8.7 1357600200079 153.6 157.0 0.0468 8.6 8.9 1357600200080 157.0 160.6 0.0441 8.9 9.2 1357600200081 160.6 164.3 0.0612 6.8 7.1 1357600200082 164.3 168.1 0.0636 6.4 6.7 1357600200083 168.1 172.1 0.0596 6.6 6.9 1357600200084 172.1 176.2 0.0541 6.6 6.9 1357600200085 176.2 180.5 0.0561 6.3 6.6 1357600200086 180.5 184.9 0.0576 6.1 6.4 1357600200087 184.9 189.4 0.0593 5.9 6.2 1357600200088 189.4 194.2 0.0628 5.5 5.8 1357600200089 194.2 199.1 0.0570 5.6 5.9 1357600200090 199.1 204.2 0.0591 5.4 5.7 1357600200091 204.2 209.6 0.0713 4.9 5.3 1357600200092 209.6 215.1 0.0724 4.9 5.3 1357600200093 215.1 220.8 0.0805 4.3 4.7 1357600200094 220.8 226.8 0.0788 4.4 4.8 1357600200095 226.8 233.0 0.0691 4.7 5.1 1357600200096 233.0 239.5 0.0645 4.8 5.2 1357600200097 239.5 246.3 0.0698 4.4 4.8 1357600200098 246.3 253.3 0.0839 3.8 4.3 1357600200099 253.3 260.7 0.0831 3.8 4.3 1357600200100 260.7 268.4 0.0874 3.7 4.2 1357600200101 268.4 276.4 0.1028 3.4 3.9 1357600200102 276.4 284.8 0.1036 3.3 3.8 1357600200103 284.8 293.6 0.1089 3.1 3.7 1357600200104 293.6 302.8 0.1060 3.0 3.6 1357600200105 302.8 312.4 0.1044 2.8 3.4 1357600200106 312.4 322.5 0.1178 2.6 3.3 1357600200107 322.5 333.1 0.1231 2.4 3.1 1357600200108 ENDDATA 84 0 1357600200109 ENDSUBENT 108 0 1357600299999 ENDENTRY 2 0 1357699999999