ENTRY M0433 20180209 M094M043300000001 SUBENT M0433001 20180209 M094M043300100001 BIB 13 70 M043300100002 TITLE Intermediate structure in the photoneutron and M043300100003 photofission cross sections in U-238 and Th-232. M043300100004 AUTHOR (O.Y.Mafra,S.Kuniyoshi,J.Goldemberg) M043300100005 REFERENCE (J,NP/A,186,110,1972) M043300100006 (J,AAB,43,571,1971) - fission cross sections in table. M043300100007 INSTITUTE (3BZLUSP) M043300100008 FACILITY (REAC,3BZLUSP) M043300100009 INC-SOURCE (MPH=(16-S-32(N,G)16-S-33)) Eg = 5.43 MeV. M043300100010 (MPH=(39-Y-89(N,G)39-Y-90)) Eg = 6.07 MeV. M043300100011 (MPH=(20-CA-40(N,G)20-CA-41)) Eg = 6.42 MeV. M043300100012 (MPH=(22-TI-48(N,G)22-TI-49)) Eg = 6.73 MeV. M043300100013 (MPH=(4-BE-9(N,G)4-BE-10)) Eg = 6.83 MeV. M043300100014 (MPH=(25-MN-55(N,G)25-MN-56)) Eg = 7.23 MeV. M043300100015 (MPH=(82-PB-207(N,G)82-PB-208)) Eg = 7.38 MeV. M043300100016 (MPH=(26-FE-56(N,G)26-FE-57)) Eg = 7.64 MeV. M043300100017 (MPH=(13-AL-27(N,G)13-AL-28)) Eg = 7.72 MeV. M043300100018 (MPH=(30-ZN-64(N,G)30-ZN-65)) Eg = 7.88 MeV. M043300100019 (MPH=(29-CU-63(N,G)29-CU-64)) Eg = 7.91 MeV. M043300100020 (MPH=(28-NI-58(N,G)28-NI-59)) Eg = 9.00 MeV. M043300100021 SAMPLE Natural uranium and thorium electrolytically M043300100022 deposited in oxide form. M043300100023 METHOD (EXTB) M043300100024 DETECTOR (TRD,BF3) Fission fragments were detected with M043300100025 a multiparallel fission chamber, the photoneutrons M043300100026 from (gamma,n) and (gamma,f) reactions were detected M043300100027 by 4pi long counter of a Halpern type with six BF3 M043300100028 detectors immersed in paraffin where neutrons are M043300100029 slowed down. M043300100030 (NAICR) for gamma-flux measurement M043300100031 ANALYSIS The photofission cross sections are related to M043300100032 the experimental counting rates by a system of M043300100033 linear equations: sum(R*sig) = (n/F)*A, which M043300100034 is the connection between the cross section 'sig' M043300100035 and gamma-ray flux 'R' at some (not main) line in M043300100036 photon spectrum with number of fissions 'n', main M043300100037 flux of photons 'F', and number of target atoms 'A'. M043300100038 This set of linier equations can Be solved only with M043300100039 some approximations. Once the solution of the M043300100040 quadratic system obtained from the principal lines M043300100041 of the elements is calculated, a linear M043300100042 interpolation is made between the first set of M043300100043 solutions, and this procedure may be repeated until M043300100044 the variations introduced are very small. M043300100045 The total cross section for neutron emission is M043300100046 given by: sig(gamma,n-tot) = sig(gamma,n)+ M043300100047 2*sig(gamma,2n) + 3*sig(gamma,3n)+...+nu*sig(gamma,F) M043300100048 + (1+nu)sig(gamma,nf) + (2+nu)sig(gamma,2nf)+..., M043300100049 where 'nu' is the number of neutrons emitted per M043300100050 per fission. Using long counter measured only M043300100051 sig(gamma,n-tot) = sig(gamma,n)+nu*sig(gamma,f) M043300100052 (work below the thresholds of other reactions). M043300100053 Substitute the latter equation to the former gives M043300100054 the system of linear equations, the solving of M043300100055 which gives the total cross section. M043300100056 ERR-ANALYS (ERR-S) The errors are statistical. However since M043300100057 the photofission cross sections in U-235 and U-238 M043300100058 which are presented in natural uranium are of the M043300100059 same order of magnitude the error committed on this M043300100060 assumption is of the order of the quantity of U-235 M043300100061 in the natural uranium - about 0.7%. M043300100062 COMMENT The (gamma,f) and (gamma,n) cross sections in U-238 M043300100063 Th-232 and the ratio width-n/width-F were measured M043300100064 and with monochromatic gamma-rays, of energies from M043300100065 5.43 to 9.00 MeV. M043300100066 HISTORY (19910218C) M043300100067 (20180209U) SD:Updated to new date formats,lower case. M043300100068 (20180209A) Corrected by SD and VV: RREFERENCE M043300100069 AAB,43,571,1971 added, STATUS, PART-DET, DATA M043300100070 replaced in SUBENT 007, ERR-ANALYS (DATA-ERR -> M043300100071 ERR-S). M043300100072 ENDBIB 70 0 M043300100073 NOCOMMON 0 0 M043300100074 ENDSUBENT 73 0 M043300199999 SUBENT M0433002 20180209 M094M043300200001 BIB 3 4 M043300200002 REACTION (92-U-238(G,F),,SIG) M043300200003 STATUS (TABLE) Data from Table 2 of NP/A,186,110,1972. M043300200004 HISTORY (20180209U) Corrected by SD and VV: STATUS, DATA M043300200005 updated according to presentation in Table. M043300200006 ENDBIB 4 0 M043300200007 NOCOMMON 0 0 M043300200008 DATA 3 12 M043300200009 EN DATA ERR-S M043300200010 MEV MB MB M043300200011 5.43 0.53 0.42 M043300200012 6.07 6.78 0.75 M043300200013 6.42 2.1 1.0 M043300200014 6.73 10.4 1.7 M043300200015 6.83 1.9 0.2 M043300200016 7.23 3.7 2.4 M043300200017 7.38 10.2 1.1 M043300200018 7.64 10.0 4.3 M043300200019 7.73 9.2 2.6 M043300200020 7.88 11.1 3.4 M043300200021 7.91 14.3 1.5 M043300200022 9. 37. 11. M043300200023 ENDDATA 14 0 M043300200024 ENDSUBENT 23 0 M043300299999 SUBENT M0433003 20180209 M094M043300300001 BIB 3 4 M043300300002 REACTION (90-TH-232(G,F),,SIG) M043300300003 STATUS (TABLE) Data from Table 2 of NP/A,186,110,1972. M043300300004 HISTORY (20180209U) Corrected by SD and VV: STATUS, DATA M043300300005 updated according to presentation in Table. M043300300006 ENDBIB 4 0 M043300300007 NOCOMMON 0 0 M043300300008 DATA 3 12 M043300300009 EN DATA ERR-S M043300300010 MEV MB MB M043300300011 5.43 0.10 0.08 M043300300012 6.07 0.82 0.57 M043300300013 6.42 2.6 0.3 M043300300014 6.73 8.00 1.30 M043300300015 6.83 2.0 0.2 M043300300016 7.23 1.8 0.6 M043300300017 7.38 2.9 0.4 M043300300018 7.64 5.7 1.1 M043300300019 7.73 3.8 0.4 M043300300020 7.88 4.6 1.8 M043300300021 7.91 5.1 1.4 M043300300022 9. 8.4 3.5 M043300300023 ENDDATA 14 0 M043300300024 ENDSUBENT 23 0 M043300399999 SUBENT M0433004 20180209 M094M043300400001 BIB 3 4 M043300400002 REACTION (92-U-238(G,N)92-U-237,,SIG) M043300400003 STATUS (TABLE) Data from Table 3 of NP/A,186,110,1972. M043300400004 HISTORY (20180209U) Corrected by SD and VV: STATUS, DATA M043300400005 updated according to presentation in Table. M043300400006 ENDBIB 4 0 M043300400007 NOCOMMON 0 0 M043300400008 DATA 3 10 M043300400009 EN DATA ERR-S M043300400010 MEV MB MB M043300400011 6.07 9.0 2.7 M043300400012 6.42 2.2 1.1 M043300400013 6.73 22.7 6.3 M043300400014 6.83 3.7 1.2 M043300400015 7.23 6.3 3.9 M043300400016 7.38 22.2 5.5 M043300400017 7.64 22.6 7.2 M043300400018 7.73 19.6 4.3 M043300400019 7.88 26.5 6.7 M043300400020 9. 93.6 22.5 M043300400021 ENDDATA 12 0 M043300400022 ENDSUBENT 21 0 M043300499999 SUBENT M0433005 20180209 M094M043300500001 BIB 3 4 M043300500002 REACTION (90-TH-232(G,X)0-NN-1,,SIG) M043300500003 STATUS (TABLE) Data from Table 3 of NP/A,186,110,1972. M043300500004 HISTORY (20180209U) Corrected by SD and VV: STATUS, DATA M043300500005 updated according to presentation in Table. M043300500006 ENDBIB 4 0 M043300500007 NOCOMMON 0 0 M043300500008 DATA 3 8 M043300500009 EN DATA ERR-S M043300500010 MEV MB MB M043300500011 6.42 5.1 2.0 M043300500012 6.73 25.7 4.1 M043300500013 7.23 5.3 2.5 M043300500014 7.38 16.1 2.6 M043300500015 7.64 21.6 5.3 M043300500016 7.73 19.2 3.9 M043300500017 7.88 23.4 4.2 M043300500018 9. 69.6 16.4 M043300500019 ENDDATA 10 0 M043300500020 ENDSUBENT 19 0 M043300599999 SUBENT M0433006 20180209 M094M043300600001 BIB 3 6 M043300600002 REACTION ((92-U-238(G,N)92-U-237,,SIG)/(92-U-238(G,F),,SIG)) M043300600003 STATUS (DEP,M0433002) M043300600004 (DEP,M0433004) M043300600005 (TABLE) Data from Table 4 of NP/A,186,110,1972. M043300600006 HISTORY (20180209U) Corrected by SD and VV: STATUS, DATA M043300600007 updated according to presentation in Table. M043300600008 ENDBIB 6 0 M043300600009 NOCOMMON 0 0 M043300600010 DATA 3 10 M043300600011 EN DATA ERR-S M043300600012 MEV NO-DIM NO-DIM M043300600013 6.07 1.3 0.4 M043300600014 6.42 1.1 0.5 M043300600015 6.73 2.1 0.6 M043300600016 6.83 1.9 0.6 M043300600017 7.23 1.7 1.1 M043300600018 7.38 2.1 0.5 M043300600019 7.64 2.2 0.8 M043300600020 7.73 2.1 0.4 M043300600021 7.88 2.3 0.7 M043300600022 9. 2.5 0.7 M043300600023 ENDDATA 12 0 M043300600024 ENDSUBENT 23 0 M043300699999 SUBENT M0433007 20180209 M094M043300700001 BIB 3 6 M043300700002 REACTION ((90-TH-232(G,N)90-TH-231,,SIG)/(90-TH-232(G,F),,SIG)) M043300700003 STATUS (DEP,M0433003) M043300700004 (DEP,M0433005) M043300700005 (TABLE) Data from Table 4 of NP/A,186,110,1972. M043300700006 HISTORY (20180209U) Corrected by SD and VV: STATUS, DATA M043300700007 replaced according to presentation in Table. M043300700008 ENDBIB 6 0 M043300700009 NOCOMMON 0 0 M043300700010 DATA 3 8 M043300700011 EN DATA ERR-S M043300700012 MEV NO-DIM NO-DIM M043300700013 6.42 2.0 0.8 M043300700014 6.73 3.2 0.6 M043300700015 7.23 2.9 1.4 M043300700016 7.38 5.5 1.0 M043300700017 7.64 3.8 0.9 M043300700018 7.73 5.1 1.0 M043300700019 7.88 5.1 1.0 M043300700020 9. 8.3 2.0 M043300700021 ENDDATA 10 0 M043300700022 ENDSUBENT 21 0 M043300799999 ENDENTRY 7 0 M043399999999