ENTRY 21811 20210317 23022181100000001 SUBENT 21811001 20210317 23022181100100001 BIB 10 26 2181100100002 TITLE The 241Pu(n,f) cross-section and its normalization 2181100100003 AUTHOR (C.Wagemans, A.J.Deruytter) 2181100100004 INSTITUTE (2BLGMOL,2ZZZGEL) 2181100100005 REFERENCE (C,82ANTWER,,69,1982) 2181100100006 FACILITY (LINAC,2ZZZGEL) GELINA 2181100100007 INC-SOURCE (PHOTO) 100 MeV electrons on natural uranium target 2181100100008 SAMPLE 241Pu and 10B samples mounted back to back. 2181100100009 (94-PU-241,ENR=0.9102) 2181100100010 A Plutonium acetate layer (550 ug/cm2) electrosprayed 2181100100011 onto an Al disc. Isotopic compositions are 2181100100012 241Pu 91.02%, 238Pu 0.03%, 239Pu 1.17%, 2181100100013 240Pu 4.48%, 242pu 3.30% 2181100100014 (5-B-10,ENR=0.93) 2181100100015 Elemental 10B layer (184 ug/cm2 thick) prepared by 2181100100016 evaporating boron in a vacuum. 2181100100017 METHOD (TOF) Three measurements were performed: 2181100100018 Flight path of 9.3 m without Cd overlap filter, 2181100100019 Flight path of 9.3 m with Cd overlap filter, 2181100100020 Flight path of 30.45 m with 10B overlap filter. 2181100100021 DETECTOR (SIBAR) Two collinear Si-Au surface barrier detectors 2181100100022 HISTORY (19830114C) A.P.T. 2181100100023 (20180829A) SD:Updated to new date formats,lower case. 2181100100024 MONITOR corrected in Subent 002. Ref. INDC(EUR)-15 2181100100025 deleted (not relevant). 2181100100026 (20190722A) On. Major revisions in 002. 2181100100027 (20210317A) On. Major revisions in 002. 2181100100028 ENDBIB 26 0 2181100100029 NOCOMMON 0 0 2181100100030 ENDSUBENT 29 0 2181100199999 SUBENT 21811002 20210317 23022181100200001 BIB 9 35 2181100200002 REACTION (94-PU-241(N,F),,SIG,,AV) 2181100200003 MONITOR ((MONIT)94-PU-241(N,F),,SIG) 2181100200004 (5-B-10(N,A)3-LI-7,,SIG) 2181100200005 MONIT-REF ((MONIT)20807001,C.Wagemans+,J,NSE,60,44,1976) 2181100200006 CORRECTION Corrected for 2181100200007 - background determined with Rh Au Co and Mn neutron 2181100200008 filters together with a permanent Al neutron filter 2181100200009 (0.8% at thermal fission, 5% at 25 keV fission, 2181100200010 0.4% at thermal 10B(n,a), 1.5% at 25 keV 10B(n,a)) 2181100200011 - deviation of 10B(n,a)7Li cross section from 1/v by 2181100200012 using Sowerby's analytical expression 2181100200013 - fission of 239Pu impurity 2181100200014 REL-REF (R,,M.Sowerby+,C,70HELSINKI,1,161,1970) 2181100200015 10B(n,a) cross section analytical expression 2181100200016 (R,21704001,C.Wagemans+,J,ANE,7,495,1980) 2181100200017 239Pu(n,f) fission cross section for correction 2181100200018 ERR-ANALYS (ERR-T) Overall accuracy from 2181100200019 - 241Pu(n,f) and 10B(n,a) background, 2181100200020 - sample impurity, 2181100200021 - deviation of 10B(n,a) cross section from 1/v, 2181100200022 which is important above 1 keV, 2181100200023 - statistical error. 2181100200024 (MONIT-ERR) thermal constant (1015+/-7 b), 2181100200025 COMMENT Cyriel Wagemans (2021-03-15): 2181100200026 The actual normalization was done to the cross 2181100200027 section integral (0.02 eV - 0.10 eV)=60.11 b*eV 2181100200028 since in this way small fluctuations of the cross 2181100200029 section in the neighbourhood of 0.0253 eV are 2181100200030 neutralized. 2181100200031 STATUS (TABLE) Table 1 of Nucl.Data for Sci. & Technol., p69 2181100200032 HISTORY (19830117C) A.P.T. 2181100200033 (20180829A) SD: SF4=Li-7 added to MONITOR reaction. 2181100200034 ERR-T -> DATA-ERR. 2181100200035 (20190722A) On. MONITOR corrected. 2181100200036 (20210317A) On. DATA-ERR -> ERR-T. MONITOR corrected. 2181100200037 ENDBIB 35 0 2181100200038 COMMON 4 3 2181100200039 EN-NRM-MIN EN-NRM-MAX MONIT MONIT-ERR 2181100200040 EV EV B B 2181100200041 0.02 0.10 1015. 7. 2181100200042 ENDCOMMON 3 0 2181100200043 DATA 4 15 2181100200044 EN-MIN EN-MAX DATA ERR-T 2181100200045 EV EV B PER-CENT 2181100200046 0.02 0.1 751.3 2. 2181100200047 0.1 0.5 681.6 2. 2181100200048 0.5 1. 42.4 2. 2181100200049 1. 10. 189.7 2. 2181100200050 10. 20. 151.7 2. 2181100200051 20. 30. 85.5 2. 2181100200052 30. 40. 49.6 3. 2181100200053 40. 50. 45.5 3. 2181100200054 50. 100. 39.6 3. 2181100200055 100. 500. 23.6 3. 2181100200056 500. 1000. 12.1 3. 2181100200057 1000. 5000. 7.21 4. 2181100200058 5000. 10000. 4.2 4. 2181100200059 10000. 20000. 3.09 4. 2181100200060 20000. 30000. 2.76 4. 2181100200061 ENDDATA 17 0 2181100200062 ENDSUBENT 61 0 2181100299999 ENDENTRY 2 0 2181199999999