ENTRY 40552 20240614 421740552000 1 SUBENT 40552001 20240614 421740552001 1 BIB 13 33 40552001 2 TITLE Absolute measurements of fission cross-sections for 40552001 3 U-233, Np-237 and Pu-239 by 14.8 MeV neutrons 40552001 4 AUTHOR (I.D.Alkhazov,S.S.Kovalenko,O.I.Kostochkin,L.Z.Malkin, 40552001 5 K.A.Petrzhak,A.M.Sokolov,A.V.Fomichev,V.I.Shpakov, 40552001 6 V.M.Adamov,B.M.Alexandrov,L.V.Drapchinsky, 40552001 7 G.Yu.Kudriavsev,D.A.Pleskachevsky) 40552001 8 V.I.Shapakov (misprint in 77NBS) = V.I.Shpakov 40552001 9 INSTITUTE (4RUSRI) 40552001 10 REFERENCE ((C,77KIEV,3,155,1977)= 40552001 11 (R,INDC(CCP)-118,(3),155,1977)) Data given 40552001 12 (C,77NBS,,313,1977) First author V.M.Adamov. 40552001 13 Same 237Np(n,f) cross section given. 40552001 14 MONITOR Absolute measurements 40552001 15 METHOD (ASSOP) 40552001 16 FACILITY (CCW) 40552001 17 DETECTOR (FISCH) Ionization and scintillation gas chambers 40552001 18 for fission fragments 40552001 19 (SOLST) Plastic scintillator for alpha-particles 40552001 20 INC-SOURCE (D-T) 40552001 21 PART-DET (FF,A) 40552001 22 CORRECTION on ionization chamber efficiency (0.8+-0.2 %), 40552001 23 on fission fragment absorption in target (1.19+-0.12 %)40552001 24 on neutron flux absorption (10.8+-0.2 %) 40552001 25 COMMENT Data are compared with another authors data.40552001 26 HISTORY (19780909C) Compiled at the centre 40552001 27 (19861021A) Data in SAN 002, 004 deleted on the reason40552001 28 of the data repetition in SANS 40547003, 40552001 29 40547009 40552001 30 (20200311A) M.M. Refs. 77NBS,,313,1977, INDC(CCP)-118 40552001 31 were added. 40552001 32 Upper -> lower case correction. 40552001 33 Dates were corrected for 4-digits year. 40552001 34 (20230303A) Subent 003 was corrected. 40552001 35 ENDBIB 33 0 40552001 36 COMMON 1 3 40552001 37 EN 40552001 38 MEV 40552001 39 14.8 40552001 40 ENDCOMMON 3 0 40552001 41 ENDSUBENT 40 0 4055200199999 NOSUBENT 40552002 20200311 418640552 2 1 SUBENT 40552003 20240614 421740552003 1 BIB 6 45 40552003 2 REACTION (93-NP-237(N,F),,SIG) 40552003 3 DECAY-DATA (93-NP-237,2.11E+06YR) (2.11+-0.01)*10**6 yr HL was 40552003 4 used to define number of nuclei in the sample. 40552003 5 ERR-ANALYS (ERR-1) Error in the solid angle arising at the 40552003 6 weighing of the sample in the small-solid- 40552003 7 angle camera 40552003 8 (ERR-2) Statistical error arising at the sample 40552003 9 weighing in the small-solid-angle camera 40552003 10 (ERR-3) Error of the isotope fraction determination 40552003 11 at the sample weighing 40552003 12 (ERR-4) Error of the fissionable isotope half-life 40552003 13 influencing on the sample weighing 40552003 14 (ERR-5) Statistical error arising by the number-of- 40552003 15 fissions determination of isotope under study 40552003 16 (ERR-6) Error due to the random coincidence number 40552003 17 by the fission number determination 40552003 18 (ERR-7) Error due to the neutron flux losses by the 40552003 19 fission number determination 40552003 20 (ERR-8) Error due to the extrapolation of the 40552003 21 fission-fragments-spectrum to zero-energy 40552003 22 arising by the number-of-fission determination40552003 23 (ERR-9) Error due to the correction on neutron 40552003 24 absorption in the layer by the number-of- 40552003 25 fissions determination 40552003 26 (ERR-10) Error due to the fission of the admixture 40552003 27 isotopes 40552003 28 (ERR-11) Error due to the associated-particles 40552003 29 number determination 40552003 30 (ERR-T) Total error ( 0.047 b absolute value) 40552003 31 (ERR-S) Statistical error of fission counts 40552003 32 STATUS (TABLE) Table 1 - uncertainties, Table 2 - CS 40552003 33 of INDC(CCP)-118,v.3,p.155,1977. 40552003 34 The same CS in Conf.Proc.77BNS,,313,1977 40552003 35 (COREL,40911006) Next measurement with improved 40552003 36 1980 - 1981 years). 40552003 37 REL-REF (A,,P.H.White+,R,EANDC(UK)-77S,1966) 40552003 38 2.36+-0.09 b at 14.1 MeV 40552003 39 (A,,A.Moat,W,MOAT,1969) Ref.in review of W.Hart 40552003 40 2.50+-0.07 b at 14.0 MeV 40552003 41 (A,,A.N.Protopopov+,J,JNE/B,9,157,1959) 40552003 42 2.40+-0.03 b at 14.0 MeV 40552003 43 (O,40553002,V.M.Adamov+,C,77NBS,,313,1977) 40552003 44 Data for incident neutrons of Cf-252 spectrum 40552003 45 HISTORY (20230303A) ERR-T=0.047 b was deleted from data block 40552003 46 according to memo CP-D/1070. 40552003 47 ENDBIB 45 0 40552003 48 COMMON 11 6 40552003 49 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 40552003 50 ERR-7 ERR-8 ERR-9 ERR-10 ERR-11 40552003 51 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 40552003 52 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 40552003 53 .3 .45 .1 .47 1.4 .2 40552003 54 1.0 .30 .30 .15 .05 40552003 55 ENDCOMMON 6 0 40552003 56 DATA 3 1 40552003 57 DATA ERR-S ERR-T 40552003 58 B PER-CENT PER-CENT 40552003 59 2.430 1.4 1.94 40552003 60 ENDDATA 3 0 40552003 61 ENDSUBENT 60 0 4055200399999 NOSUBENT 40552004 20200311 418640552 4 1 ENDENTRY 4 0 4055299999999