ENTRY 31425 20240324 32133142500000001 SUBENT 31425001 20240324 32133142500100001 BIB 12 31 3142500100002 TITLE Measurement of the fission cross-section ratio for 3142500100003 237Np/235U around 14 MeV neutron energies 3142500100004 AUTHOR (L.Desdin, S.Szegedi, J.Csikai) 3142500100005 INSTITUTE (3HUNKOS) 3142500100006 REFERENCE (J,AHP,65,271,1989) 3142500100007 SAMPLE 235U (481 ug) and 237Np (418 ug) as tetrafluorides 3142500100008 deposited onto Al holders. 3142500100009 (93-NP-237,ENR=0.999917) 3142500100010 (92-U-235,ENR=0.999955) 3142500100011 FACILITY (CCW,3HUNKOS) 180 kV accelerator 3142500100012 INC-SOURCE (D-T) Neutrons from 180 keV deuterons at 0, 30, 60 3142500100013 90 and 120 deg. 3142500100014 DETECTOR (IOCH) Low-mass double ionization chamber placed at a 3142500100015 distance of 7 cm from the beam spot on the tritium 3142500100016 target. 3142500100017 The samples were placed back-to-back in the chamber 3142500100018 and measurement was replaced by swapping the 3142500100019 positions of 237Np and 235U. 3142500100020 CORRECTION Corrected for 3142500100021 . extrapolation to zero bias (2-4%) 3142500100022 . fission fragment loss in sample deposits (1.8%) 3142500100023 . thermal and epithermal neutrons (1%) 3142500100024 ERR-ANALYS (ERR-T) The total uncertainty (4.3-4.4%)3142500100025 (ERR-S,0.6,0.8) statistical error (0.6-0.8%)3142500100026 (ERR-1,0.4,0.8) extrapolation to zero bias (0.4-0.8%)3142500100027 (ERR-2) fission fragment loss in sample deposits(0.18%)3142500100028 (ERR-3) mass ratio (4.24%)3142500100029 STATUS (TABLE,,L.Desdin+,J,AHP,65,271,1989) Table 3 3142500100030 HISTORY (19931123C) HW 3142500100031 (20090730U) SD: Updated to new date formats, lower case3142500100032 (20240324A) VT+On. Revision in 002. ERR-3 added in 001.3142500100033 ENDBIB 31 0 3142500100034 COMMON 2 3 3142500100035 ERR-2 ERR-3 3142500100036 PER-CENT PER-CENT 3142500100037 0.18 4.24 3142500100038 ENDCOMMON 3 0 3142500100039 ENDSUBENT 38 0 3142500199999 SUBENT 31425002 20240324 32133142500200001 BIB 2 2 3142500200002 REACTION ((93-NP-237(N,F),,SIG)/(92-U-235(N,F),,SIG)) 3142500200003 HISTORY (20240324A) VT+On. EN-ERR -> EN-RSL-HW 3142500200004 ENDBIB 2 0 3142500200005 NOCOMMON 0 0 3142500200006 DATA 4 5 3142500200007 EN EN-RSL-HW DATA ERR-T 3142500200008 MEV MEV NO-DIM NO-DIM 3142500200009 14.80 0.17 0.999 0.043 3142500200010 14.70 0.15 1.054 0.046 3142500200011 14.45 0.12 1.042 0.045 3142500200012 14.12 0.08 1.021 0.044 3142500200013 13.75 0.10 1.006 0.043 3142500200014 ENDDATA 7 0 3142500200015 ENDSUBENT 14 0 3142500299999 ENDENTRY 2 0 3142599999999