ENTRY 40916 20191104 41844091600000001 SUBENT 40916001 20191104 41844091600100001 BIB 12 37 4091600100002 INSTITUTE (4RUSFEI) 4091600100003 REFERENCE (J,AE,71,67,1991) First author A.Polyakov. Issue 1. 4091600100004 Emission c-s and EN were revised . 4091600100005 (J,SJA,71,593,1991) Engl. translation of J,AE,71 . 4091600100006 #doi:10.1007/BF01138006 4091600100007 (J,YK,,(3),34,1986) Data of spectrum. 4091600100008 First author S.E.Sukhikh. 4091600100009 (R,INDC(CCP)-319,37,1990) Engl. translation of J,YK. 4091600100010 AUTHOR (A.V.Polyakov,G.N.Lovchikova,B.V.Zhuravlev, 4091600100011 S.E.Sukhikh,V.A.Vinogradov,O.A.Sal'nikov) 4091600100012 TITLE Spectrum and yield of prompt 232Th fission neutrons. 4091600100013 REL-REF (I,,S.P.Simakov+,J,AE,51,244,1981) Issue 4. 4091600100014 (I,,N.I.Fetisov+,J,PTE,,(6),22,1980) 4091600100015 (I,,A.M.Trufanov+,J,PTE,,(2),50,1979) 4091600100016 Spectrometer details 4091600100017 (M,,S.P.Simakov+,J,YK,,(5/44),23,1981) 4091600100018 (R,,,R,INDC-36,9,1980) Nuclear standards file 4091600100019 INDC/NEANDC, 1980, INDC-36/LN, Vienna, 1981, p.A-9. 4091600100020 FACILITY (VDG) Accelerator EGP-10M 4091600100021 INC-SOURCE (P-T) Gaseous tritium target 4091600100022 METHOD (TOF) 4091600100023 DETECTOR (SCIN) Stilbene crystal for fission neutrons detection 4091600100024 (LONGC) For incident neutrons flux monitoring 4091600100025 MONITOR (98-CF-252(0,F),,DE) 4091600100026 To define registration efficiency of detector. 4091600100027 STATUS (APRVD) Received from Sukhikh, 1987-02 4091600100028 HISTORY (19870327C) Compiled at the CJD 4091600100029 (19920724U) ANG deleted from COMMON section in SAN 0024091600100030 Commentary added 4091600100031 (20010315A) DATE is corrected 4091600100032 (20100812A) Ref.R,INDC(CCP)-319,37,1990 was added. 4091600100033 Upper -> lower case correction. 4091600100034 BIB information was added. 4091600100035 (20101130U) Misprints in free text were corrected. 4091600100036 (20121003U) First author and TITLE were corrected. 4091600100037 DOI was added. 4091600100038 (20191104U) Ref. YK was corrected. 4091600100039 ENDBIB 37 0 4091600100040 NOCOMMON 0 0 4091600100041 ENDSUBENT 40 0 4091600199999 SUBENT 40916002 20191104 41844091600200001 BIB 14 63 4091600200002 REACTION (90-TH-232(N,F)0-NN-1,,DA/DE,,4PI) 4091600200003 Neutron emission spectrum 4091600200004 SAMPLE Hollow metallic cylinder containing 0.727 moles 4091600200005 of Th-232. 4091600200006 Carbon hollow cylinder of outer diameter 3.0 cm, 4091600200007 4.5 cm height, wall thickness 0.5 cm, containing 4091600200008 13.27 moles of C-12. 4091600200009 MONITOR ((MONIT)6-C-0(N,EL)6-C-0,,DA) 4091600200010 Th-232 neutron emission differential spectrum was 4091600200011 defined by normalization to carbon elastic spectrum 4091600200012 measured at 90 degrees. 4091600200013 MONIT-REF ((MONIT),,R,INDC-36,1981) INDC-36/LN, page A-9. 4091600200014 ANALYSIS (4PI1A) 4091600200015 After subtraction of elastic scattering component, 4091600200016 spectra were analyzed in energy range 2-10 MeV, where 4091600200017 there are only fissions neutrons. 4091600200018 REL-REF (M,,S.Simakov+,J,YK,,(5/44),23,1981). 4091600200019 (N,,S.Nair+,R,INDC(UK)-23,26,1974) 4091600200020 INDC(UK)-23/L, Harwell. See ADD-RES. 4091600200021 ADD-RES Approximation by Maxwell spectrum as 4091600200022 N(E)=A*sqrt(E)*exp(-E/T) , A=0.151+-0.006 MeV**-1.5, 4091600200023 T=1.27+-0.04 MeV . 4091600200024 Ratio of neutrons emitted at 150 deg to neutrons 4091600200025 emitted at 90 degrees was defined to be 1.004+-0.04 - 4091600200026 value agrees with value of S.Nair+. 4091600200027 CRITIQUE Of compiler M.M. 4091600200028 Spectrum given in table of J,YK agrees with data of 4091600200029 Fig.2 (at 90 deg, B/MEV/SR) of J,YK multiplied by 4PI. 4091600200030 But integration of spectrum (given in table of J,YK) 4091600200031 leads to the integral value 0.755 b, what is 10 times 4091600200032 higher than fission c-s ( 0.077 b, A.D.Carlsson, 1982),4091600200033 and higher than neutron emission c-s defined in this 4091600200034 experiment to be 0.185+-0.021 b (see Subent 003). 4091600200035 Also there are disagreements (and misprints ) in given 4091600200036 values of carbon monitor: 4091600200037 in J,YK,1986,(3),34 - dif.el.c-s 0.2033 b/sr4091600200038 in MONIT-REF R,INDC-36,1981 - el.c-s 0.2033+1 b 4091600200039 in J,AE,71,67,1991 - dif.el.c-s 0.152 sr 4091600200040 In the article J,AE,71,(1),67,1991 : 4091600200041 Fig.1 data are 10 times lower than Fig. 2 of J,YK, 4091600200042 Fig.2 data are 10 times lower than 410916.002. 4091600200043 Conclusion: 4091600200044 1) data of Table of J,YK have to be divided 4091600200045 by factor 10. according to Fig.2 of J,AE,67, 4091600200046 2) carbon monitor c-s is 0.152 b/sr . 4091600200047 ERR-ANALYS (ERR-S,2.,7.) Statistical error 4091600200048 (ERR-T) Total error 4091600200049 STATUS (TABLE) Table of J,YK,,3,34,1986 4091600200050 COMMENT Angle of measurement is 90 adeg 4091600200051 CORRECTION For background. 4091600200052 Elastic scattering component was subtracted by method 4091600200053 described in REL-REF of S.Simakov+. 4091600200054 MISC-COL (MISC) Data of Table of J,YK are given in MISC , 4091600200055 see CRITIQUE. 4091600200056 HISTORY (20100812A) MONIT was added. REACTION was corrected: 4091600200057 ,PR,DE,N -> 0-NN-1,,DA/DE,,4PI according to comment of4091600200058 N.Otsuka (NDS, IAEA). 4091600200059 Units was corrected: 1/MEV -> B/MEV as given in Table. 4091600200060 DATA values were divided by factor 10. - see 4091600200061 CRITIQUE. Data of Table of J,YK are given in MISC. 4091600200062 MONIT value was corrected 0.2033 -> 0.152(see CRITIQUE)4091600200063 (20191104A) ERR-1 ( minimal statistical errror) was 4091600200064 deleted from COMMON 4091600200065 ENDBIB 63 0 4091600200066 COMMON 4 3 4091600200067 MONIT EN EN-ERR ANG 4091600200068 B/SR MEV MEV ADEG 4091600200069 0.152 1.49 .05 90. 4091600200070 ENDCOMMON 3 0 4091600200071 DATA 4 42 4091600200072 E DATA ERR-T MISC 4091600200073 MEV B/MEV PER-CENT B/MEV 4091600200074 2.03 624.0E-4 5.2 6240.E-4 4091600200075 2.20 453.1E-4 5.2 4531.E-4 4091600200076 2.40 366.8E-4 5.3 3668.E-4 4091600200077 2.60 321.4E-4 5.3 3214.E-4 4091600200078 2.81 269.3E-4 5.3 2693.E-4 4091600200079 3.00 264.8E-4 5.3 2648.E-4 4091600200080 3.19 206.0E-4 5.3 2060.E-4 4091600200081 3.40 190.1E-4 5.6 1901.E-4 4091600200082 3.60 164.3E-4 5.6 1643.E-4 4091600200083 3.80 154.9E-4 5.6 1549.E-4 4091600200084 3.99 142.8E-4 5.6 1428.E-4 4091600200085 4.20 112.5E-4 5.6 1125.E-4 4091600200086 4.42 113.8E-4 5.6 1138.E-4 4091600200087 4.62 91.2E-4 5.6 912.E-4 4091600200088 4.80 84.3E-4 5.6 843.E-4 4091600200089 4.99 66.7E-4 6.1 667.E-4 4091600200090 5.19 59.2E-4 6.1 592.E-4 4091600200091 5.41 62.0E-4 6.1 620.E-4 4091600200092 5.64 44.2E-4 6.1 442.E-4 4091600200093 5.83 46.1E-4 6.8 461.E-4 4091600200094 6.03 40.7E-4 6.8 407.E-4 4091600200095 6.19 33.2E-4 7. 332.E-4 4091600200096 6.36 26.6E-4 7. 266.E-4 4091600200097 6.59 30.0E-4 8.5 300.E-4 4091600200098 6.84 23.1E-4 8.5 231.E-4 4091600200099 7.03 18.6E-4 10. 186.E-4 4091600200100 7.23 22.6E-4 10. 226.E-4 4091600200101 7.44 20.3E-4 10. 203.E-4 4091600200102 7.59 17.5E-4 12. 175.E-4 4091600200103 7.81 11.5E-4 12. 115.E-4 4091600200104 8.05 12.1E-4 12. 121.E-4 4091600200105 8.21 10.0E-4 15. 100.E-4 4091600200106 8.38 9.2E-4 15. 92.E-4 4091600200107 8.56 9.4E-4 26. 94.E-4 4091600200108 8.73 8.3E-4 26. 83.E-4 4091600200109 8.92 11.1E-4 26. 111.E-4 4091600200110 9.11 5.1E-4 32. 51.E-4 4091600200111 9.31 3.1E-4 32. 31.E-4 4091600200112 9.51 5.9E-4 32. 59.E-4 4091600200113 9.72 1.7E-4 32. 17.E-4 4091600200114 9.94 4.3E-4 40. 43.E-4 4091600200115 10.16 6.8E-4 40. 68.E-4 4091600200116 ENDDATA 44 0 4091600200117 ENDSUBENT 116 0 4091600299999 SUBENT 40916003 20191104 41844091600300001 BIB 8 25 4091600300002 REACTION (90-TH-232(N,F)0-NN-1,,SIG) 4091600300003 Fission neutron emission cross section. 4091600300004 MONITOR ((MONIT)6-C-0(N,EL)6-C-0,,DA) 4091600300005 MONIT-REF ((MONIT),V.Bychkov+,P,FEI-1917,1988) 4091600300006 ANALYSIS (INTED) Data were derived from measured spectrum by 4091600300007 by its Maxwellian approximation in energy range from 4091600300008 about 2 to about 8 MeV and integration of obtained 4091600300009 Maxwellian distribution on neutron energy from zero to 4091600300010 infinity. 4091600300011 Approximation by Maxwell spectrum as 4091600300012 N(E)=A*sqrt(E)*exp(-E/T) , A=0.1516 MeV**-1.5/B, 4091600300013 T=1.252+-0.04 MeV . 4091600300014 Emission c-s agree well with value 0.156 b derived 4091600300015 from fission c-s 0.07178 b of J.Behreus+ multiplied 4091600300016 by average prompt neutron multiplicity 2.1576 of 4091600300017 V.Malinovskii+. 4091600300018 REL-REF (N,,J.W.Behrens+,J,NSE,81,512,1982) 4091600300019 (N,,V.Malinovskii+,J,AE,54,83,1983) Issue 2. 4091600300020 See ANALYSIS. 4091600300021 ERR-ANALYS (DATA-ERR) Not explained, probably total error . 4091600300022 STATUS (TABLE) Text, page 595 of J,AE/T,71,593,1991. 4091600300023 In text, page 36 of J,YK,,(5/44),23,1981 - 4091600300024 preliminary value 0.185+-0.021 b. 4091600300025 (DEP,40916002) See ANALYSIS. 4091600300026 HISTORY (20100812C) 4091600300027 ENDBIB 25 0 4091600300028 COMMON 2 3 4091600300029 EN EN-ERR 4091600300030 MEV MEV 4091600300031 1.45 .05 4091600300032 ENDCOMMON 3 0 4091600300033 DATA 3 1 4091600300034 DATA DATA-ERR MONIT 4091600300035 B B B/SR 4091600300036 0.188 0.013 0.152 4091600300037 ENDDATA 3 0 4091600300038 ENDSUBENT 37 0 4091600399999 ENDENTRY 3 0 4091699999999