ENTRY 40011 20141114 41674001100000001 SUBENT 40011001 20141114 41674001100100001 BIB 15 56 4001100100002 TITLE On variation of the kinetic energy of the fragments 4001100100003 from 92-U-235 fission by 0.15-1.68 MeV neutrons 4001100100004 AUTHOR (E.Dermendzhiev, N.Kashukeev, Ts.Panteleev, 4001100100005 Tyan San Khak) 4001100100006 INSTITUTE (4ZZZDUB) 4001100100007 REFERENCE (R,JINR-P3-4873,196912) 4001100100008 REL-REF (I,,S.Bochvarov+,R,JINR-P3-4110,1968) 4001100100009 (I,,V.Z.Mikhaylova+,J,NIM,66,25,1968) 4001100100010 MONITOR No information. 4001100100011 Absolute counting of fission events. 4001100100012 COMMENT Of compiler M.M. 4001100100013 Initially, this MONITOR was compiled in 1970 by reactio4001100100014 (U-235(N,F),,DE,FF,REL)=1. . 4001100100015 In 2014 reaction is 4001100100016 "(U-235(N,F),,AKE,FF) =1. at thermal fission" , 4001100100017 what is wrong, because AKE,FF at thermal fission is 4001100100018 about 170 MeV (TKE) . 4001100100019 FACILITY (VDG,4ZZZDUB) Van de Graaff EG-5 4001100100020 Proton current ~20-30 microA. 4001100100021 INC-SOURCE (P-LI7) Thickness of Li target is 0.38 mg/cm2, 4001100100022 diameter is equal to 1cm . 4001100100023 Energy resolution at all points is about 0.08 MeV. 4001100100024 For fast neutrons in 0.15 MeV - 1.68 MeV energy range.4001100100025 - Thermal neutrons were obtained by slowing-down in 4001100100026 paraffin block. 4001100100027 SAMPLE Two samples in ionization chamber. Diameter 9.2 cm . 4001100100028 Thickness ~ 1.8 mg/cm2 . 4001100100029 METHOD (FISCT) 4001100100030 Cyclic measurements at fast and thermal neutron beams 4001100100031 about 30 min at each beam. 4001100100032 2PI geometry in combination with samples rotation at 4001100100033 45 deg to avoid influence from angular anisotropy of 4001100100034 fission fragments. 4001100100035 PART-DET (FF) Fission-fragments 4001100100036 DETECTOR (FISCH) Double ionization fission chamber. 4001100100037 Registration discrimination thresholds 55-60 MeV and 4001100100038 20 MeV. 4001100100039 ERR-ANALYS (DATA-ERR) Standard deviation. 4001100100040 HISTORY (19700619R) 4001100100041 (19700619C) 4001100100042 (19830303A) corrected in BNL 4001100100043 (19971214A) corrected in CJD 4001100100044 (20141114A) SD: Updated to new date formats,lower case.4001100100045 Code in METHOD deleted. SF6=KE -> AKE in MONITOR and 4001100100046 REACTION code according to EXFOR rules in Subents 1-3.4001100100047 (20141223A) M.M. The article was checked, 4001100100048 BIB information was updated in FACILITY,INC-SOURCE, 4001100100049 METHOD,SAMPLE,DETECTOR,ERR-ANALYS,ANALYSIS,STATUS, 4001100100050 REL-REF,EN-SEC,COMMENTs. 4001100100051 MONITOR was deleted as wrong - see COMMENT of compiler.4001100100052 Reaction was corrected (see ANALYSIS in Subent 002) : 4001100100053 (92-U-235(N,F),,AKE,FF,REL) -> 4001100100054 ((92-U-235(N,F),PAR/PRE,FY,,REL/MSC)// 4001100100055 (92-U-235(N,F),PAR/PRE,FY,,REL/MSC)) . 4001100100056 EN -> EN-NM; E1-MIN,E2-MIN, EN-DN, EN-SEC were added. 4001100100057 ARB-UNITS -> NO-DIM . 4001100100058 ENDBIB 56 0 4001100100059 COMMON 1 3 4001100100060 EN-RSL-FW 4001100100061 MEV 4001100100062 0.08 4001100100063 ENDCOMMON 3 0 4001100100064 ENDSUBENT 63 0 4001100199999 SUBENT 40011002 20141114 41674001100200001 BIB 6 45 4001100200002 REACTION ((92-U-235(N,F),PAR/PRE,FY,,MSC)// 4001100200003 (92-U-235(N,F),PAR/PRE,FY,,MSC)) 4001100200004 See ANALYSIS for explanation of measured quantity. 4001100200005 ANALYSIS Relative yield W of fission fragments was defined as: 4001100200006 W=(N1fast/N2fast)/(N1thermal/N2thermal), 4001100200007 N1 - number of counts in 1st sample with high 4001100200008 discrimination threshold E1=55-60 MeV, 4001100200009 N2 - number of counts in 2nd sample with low 4001100200010 discrimination threshold E2=20 MeV; corrected for 4001100200011 backgrounds due to alpha-particles 4001100200012 ( average background ~ 2count/min). 4001100200013 fast - for fast neutrons, 4001100200014 thermal - for thermal neutrons. 4001100200015 Maximal counts rate in measurement at thermal neutrons 4001100200016 about 200 count/sec. 4001100200017 EN-SEC (E1-MIN,FF) High discrimination threshold E1=55-60 MeV.4001100200018 (E2-MIN,FF) Low discrimination threshold E2=20 MeV. 4001100200019 COMMENT Of compiler M.M. 4001100200020 On Fig.1 these data are given in two Y scales: 4001100200021 left - W ( see ANALYSIS), right - deltaEk, where 4001100200022 deltaEk - average deviation of fission fragments 4001100200023 kinetic energy at fission by fast neutrons EKfast 4001100200024 from one at fission by thermal neutrons EKthermal, 4001100200025 EKfast-EKthermal. 4001100200026 Scale values correspondence: 4001100200027 W,no-dim deltaEk,MeV 4001100200028 0.96 -0.8 4001100200029 0.98 -0.4 4001100200030 1.00 0. 4001100200031 1.02 0.4 4001100200032 1.04 0.8 4001100200033 So, to define deltaEk (MeV) from W values (no-dim), 4001100200034 a formula could be applied: 4001100200035 deltaEk= (W-1.)*20 . 4001100200036 STATUS (PRELM) Preliminary measurement. 4001100200037 (TABLE) Table 1 of R,JINR-P3-4873,1969 . 4001100200038 HISTORY (19971214A) Reaction quantity corrected 4001100200039 (20141114A) SD: SF6=KE -> AKE in REACTION code 4001100200040 according to EXFOR rules. 4001100200041 (20141223A) M.M. Reaction was corrected 4001100200042 (92-U-235(N,F),,AKE,FF,REL) -> 4001100200043 ((92-U-235(N,F),PAR/PRE,FY,,REL/MSC)// 4001100200044 (92-U-235(N,F),PAR/PRE,FY,,REL/MSC)) . 4001100200045 EN -> EN-NM; E1-MIN,E2-MIN, EN-DN, EN-SEC were added. 4001100200046 ARB-UNITS -> NO-DIM . 4001100200047 ENDBIB 45 0 4001100200048 COMMON 3 3 4001100200049 EN-DN E1-MIN E2-MIN 4001100200050 EV MEV MEV 4001100200051 0.0253 55. 20. 4001100200052 ENDCOMMON 3 0 4001100200053 DATA 3 4 4001100200054 EN-NM DATA DATA-ERR 4001100200055 MEV NO-DIM NO-DIM 4001100200056 1.5 0.995 0.026 4001100200057 4.3 1.005 0.020 4001100200058 7.7 1.020 0.019 4001100200059 9.9 1.005 0.023 4001100200060 ENDDATA 6 0 4001100200061 ENDSUBENT 60 0 4001100299999 SUBENT 40011003 20141114 41674001100300001 BIB 5 12 4001100300002 REACTION ((92-U-235(N,F),PAR/PRE,FY,,MSC)// 4001100300003 (92-U-235(N,F),PAR/PRE,FY,,MSC)) 4001100300004 See ANALYSIS for explanation of measured quantity, 4001100300005 in this Subent and in Subent 002. 4001100300006 ANALYSIS Data are averaged on several measurements 4001100300007 See also ANALYSIS in Subent 002 for data definition. 4001100300008 EN-SEC (E1-MIN,FF) High discrimination threshold E1=55-60 MeV.4001100300009 (E2-MIN,FF) Low discrimination threshold E2=20 MeV. 4001100300010 STATUS (TABLE) Table 1 of R,JINR-P3-4873,1969 . 4001100300011 HISTORY (19971214A) Reaction quantity corrected 4001100300012 (20141114A) SD: SF6=KE -> AKE in REACTION code 4001100300013 according to EXFOR rules. 4001100300014 ENDBIB 12 0 4001100300015 COMMON 3 3 4001100300016 EN-DN E1-MIN E2-MIN 4001100300017 EV MEV MEV 4001100300018 0.0253 55. 20. 4001100300019 ENDCOMMON 3 0 4001100300020 DATA 3 14 4001100300021 EN-NM DATA DATA-ERR 4001100300022 MEV NO-DIM NO-DIM 4001100300023 0.26 1.000 0.006 4001100300024 0.37 0.991 0.005 4001100300025 0.49 1.002 0.004 4001100300026 0.59 0.999 0.004 4001100300027 0.71 1.009 0.006 4001100300028 0.77 1.018 0.009 4001100300029 0.81 1.016 0.006 4001100300030 0.88 0.998 0.008 4001100300031 0.99 0.996 0.008 4001100300032 1.09 1.006 0.008 4001100300033 1.21 1.014 0.008 4001100300034 1.38 1.011 0.010 4001100300035 1.58 1.013 0.008 4001100300036 1.68 1.018 0.010 4001100300037 ENDDATA 16 0 4001100300038 ENDSUBENT 37 0 4001100399999 ENDENTRY 3 0 4001199999999