ENTRY 23356 20201211 229623356 0 1 SUBENT 23356001 20201211 229623356 1 1 BIB 11 38 23356 1 2 TITLE On the delayed neutron yields of the longer-lived 23356 1 3 halogen precursors in thermal neutron fission of 235U 23356 1 4 AUTHOR (P.del Marmol,P.Fettweis,D.C.Perricos) 23356 1 5 REFERENCE (J,RCA,16,4,1971) 23356 1 6 INSTITUTE (2BLGMOL) 23356 1 7 FACILITY (REAC,2BLGMOL) BR1 graphite reactor 23356 1 8 INC-SOURCE (REAC) Irradiation in the core of BR1 reactor. 23356 1 9 INC-SPECT Thermal neutron flux ~2E+11 n/cm2/sec. 23356 1 10 ~ 5%% epicadmium neutron contribution. 23356 1 11 SAMPLE For I: 23356 1 12 50 mg of U-235 ( 90% enrichment) dissolved in 0.8ml 23356 1 13 of water containing 1mg I-, 0.1mg IO(4)- and 1mg Br- 23356 1 14 carriers, 0.7ml 1 M Na(2)CO(3) and 0.1 ml 131I tracer. 23356 1 15 Irradiation usually 20sec, cooling time 15 sec. 23356 1 16 For Br: 23356 1 17 50mg U-235, 2mg IO(3)-and 5mg BrO(3)- carriers in 23356 1 18 solution in 0.7ml water. 23356 1 19 15sec irradiation, 10sec cooling, transferred to the 23356 1 20 neutron counter 90 to 130 sec after irradiation. 23356 1 21 METHOD (CHSEP) Iodine separation based on the CCL(4) 23356 1 22 extraction method of I(2) - in about 1 min. 23356 1 23 Br(2) extraction in CCl(4). 23356 1 24 I-137 activity was measured with respect to the 23356 1 25 55.6 sec delayed neutron activity of unseparated U-235 23356 1 26 samples, irradiated and measured under the same 23356 1 27 conditions. 23356 1 28 DETECTOR (HE3SP) Five He-3 counters in paraffin as delayed 23356 1 29 neutron detector. Overall efficiency ( defined by 23356 1 30 Cf-252 source) - 2.6%. Detector response - see 23356 1 31 Fig.2 of RCA,16,4,1971 23356 1 32 (GELI) Ge(Li) detector ( 4cm3 , 50 cm3) to measure 23356 1 33 403 keV gamma-ray from 87Kr or 456 keV gamma-ray from 23356 1 34 137Xe. 23356 1 35 Connected with 1024 channel pulse height analyzer. 23356 1 36 Absolute efficiency was measured by 137Cs, 22Na, 198Au 23356 1 37 sources. 23356 1 38 HISTORY (20171113C) M.M. 23356 1 39 (20201211U) SD: Correction in Subent 009. 23356 1 40 ENDBIB 38 0 23356 1 41 NOCOMMON 0 0 23356 1 42 ENDSUBENT 41 0 23356 199999 SUBENT 23356002 20171113 226823356 2 1 BIB 6 11 23356 2 2 REACTION ((92-U-235(N,F)53-I-137,DL/CUM,NU)/ 23356 2 3 (92-U-235(N,F)35-BR-87,DL/CUM,NU)) 23356 2 4 ANALYSIS Result of 6 runs for each isotope. 23356 2 5 CORRECTION For saturation and counter efficiency. 23356 2 6 DECAY-DATA (35-BR-87,55.6SEC) 55.6+-0.3 sec ( error - twice 23356 2 7 standard deviation) measured 23356 2 8 (53-I-137,24.7SEC) 24.7+-0.2 sec ( error - twice 23356 2 9 standard deviation) measured 23356 2 10 ERR-ANALYS (DATA-ERR) Twice standard deviation is in text, 23356 2 11 divided by 2 by compiler. 23356 2 12 STATUS (TABLE) Text, page 7 of J.Radiochim.Acta,16,4,1971 23356 2 13 ENDBIB 11 0 23356 2 14 COMMON 1 3 23356 2 15 EN-DUMMY 23356 2 16 EV 23356 2 17 0.0253 23356 2 18 ENDCOMMON 3 0 23356 2 19 DATA 2 1 23356 2 20 DATA DATA-ERR 23356 2 21 NO-DIM NO-DIM 23356 2 22 4.85 0.10 23356 2 23 ENDDATA 3 0 23356 2 24 ENDSUBENT 23 0 23356 299999 SUBENT 23356003 20171113 226823356 3 1 BIB 5 8 23356 3 2 REACTION ((92-U-235(N,F)35-BR-88,DL/CUM,NU)/ 23356 3 3 (92-U-235(N,F)35-BR-87,DL/CUM,NU)) 23356 3 4 ANALYSIS Result of 8 runs for each isotope. 23356 3 5 DECAY-DATA (35-BR-87,55.6SEC) 55.6+-0.3 sec ( error - twice 23356 3 6 standard deviation) measured 23356 3 7 ERR-ANALYS (DATA-ERR) Twice standard deviation is in text, 23356 3 8 divided by 2 by compiler. 23356 3 9 STATUS (TABLE) Text, page 7 of J.Radiochim.Acta,16,4,1971 23356 3 10 ENDBIB 8 0 23356 3 11 COMMON 1 3 23356 3 12 EN-DUMMY 23356 3 13 EV 23356 3 14 0.0253 23356 3 15 ENDCOMMON 3 0 23356 3 16 DATA 2 1 23356 3 17 DATA DATA-ERR 23356 3 18 NO-DIM NO-DIM 23356 3 19 1.7 0.1 23356 3 20 ENDDATA 3 0 23356 3 21 ENDSUBENT 20 0 23356 399999 SUBENT 23356004 20171113 226823356 4 1 BIB 6 18 23356 4 2 REACTION (92-U-235(N,F)35-BR-87,DL/CUM,NU) 23356 4 3 87Br delayed neutron yield 23356 4 4 DECAY-DATA (35-BR-87,55.6SEC) 55.6+-0.3 sec ( error - twice 23356 4 5 standard deviation) measured 23356 4 6 METHOD Measured relative to Cf-252 standard source. 23356 4 7 REL-REF (A,13700017,G.R.Keepin+,J,PR,107,1044,1957) 23356 4 8 (A,13700017,G.R.Keepin+,J,JNE,6,1,1957) 23356 4 9 5.2+-0.5 n/10**4fis. 23356 4 10 G.R.Keepin+,Physics and Nuclear Kinetics,ch.4, 23356 4 11 Addison-Wesley publishing Co., 1965 . 23356 4 12 5.8+-0.7 n/10**4fis. 23356 4 13 (A,23362002,H.D.Schuessler+,C,69VIENNA,,591,1969) 23356 4 14 5.9+-0.9 n/10**4fis. (unseparated sample) 23356 4 15 (A,23362003,H.D.Schuessler+,C,69VIENNA,,591,1969) 23356 4 16 5.6+-0.3 n/10**4FIS. (separated sample) 23356 4 17 ERR-ANALYS (DATA-ERR) Type of error is not explained in article 23356 4 18 STATUS (TABLE) Text, page 7 and Table 2 of 23356 4 19 J.Radiochim.Acta,16,4,1971 23356 4 20 ENDBIB 18 0 23356 4 21 COMMON 1 3 23356 4 22 EN-DUMMY 23356 4 23 EV 23356 4 24 0.0253 23356 4 25 ENDCOMMON 3 0 23356 4 26 DATA 2 1 23356 4 27 DATA DATA-ERR 23356 4 28 PC/FIS PC/FIS 23356 4 29 5.8E-2 0.4E-2 23356 4 30 ENDDATA 3 0 23356 4 31 ENDSUBENT 30 0 23356 499999 SUBENT 23356005 20171113 226823356 5 1 BIB 7 18 23356 5 2 REACTION (92-U-235(N,F)ELEM/MASS,DL/CUM,NU) 23356 5 3 Absolute delayed neutron yields from I and Br isotopes23356 5 4 DECAY-DATA (35-BR-87,55.6SEC) 55.6+-0.3 sec ( error - twice 23356 5 5 standard deviation) measured 23356 5 6 (53-I-137,24.7SEC) 24.7+-0.2 sec ( error - twice 23356 5 7 standard deviation) measured 23356 5 8 MONITOR (92-U-235(N,F)35-BR-87,DL/CUM,NU) 23356 5 9 MONIT-REF (23356004,P.del Marmol+,J,RCA,16,4,1971) 23356 5 10 Measured at this work. 23356 5 11 REL-REF G.R.Keepin+,Physics and Nuclear Kinetics,ch.4, 23356 5 12 Addison-Wesley publishing Co., 1965 . 23356 5 13 I-137 : 21.2+-4.5 n/10**4fis. 23356 5 14 Br-88 : 16.7+-7.0 n/10**4fis. 23356 5 15 (D,23262003,H.D.Schuessler+,C,69VIENNA,,591,1969) 23356 5 16 I-137 : 21.7+-2.6 n/10**4fis. 23356 5 17 Br-88 : 12.1+-1.5 n/10**4fis. 23356 5 18 ERR-ANALYS (DATA-ERR) Type of error is not explained in article 23356 5 19 STATUS (TABLE) Table 2 of J.Radiochim.Acta,16,4,1971 23356 5 20 ENDBIB 18 0 23356 5 21 COMMON 1 3 23356 5 22 EN-DUMMY 23356 5 23 EV 23356 5 24 0.0253 23356 5 25 ENDCOMMON 3 0 23356 5 26 DATA 4 2 23356 5 27 ELEMENT MASS DATA DATA-ERR 23356 5 28 NO-DIM NO-DIM PC/FIS PC/FIS 23356 5 29 53. 137. 28.1E-2 2.3E-2 23356 5 30 35. 88. 9.9E-2 1.4E-2 23356 5 31 ENDDATA 4 0 23356 5 32 ENDSUBENT 31 0 23356 599999 SUBENT 23356006 20171113 226823356 6 1 BIB 6 20 23356 6 2 REACTION (92-U-235(N,F),DL/GRP,NU) 23356 6 3 Delayed neutron yield for 2nd group. 23356 6 4 ANALYSIS The weak contribution of 0.32+-0.06 n/10**4fis. for 23356 6 5 24.9sec 141Cs was taken into account; 23356 6 6 possible contribution of 136Te was neglected. 23356 6 7 REL-REF (A,13700017,G.R.Keepin+,J,PR,107,1044,1957) 23356 6 8 (A,13700017,G.R.Keepin+,J,JNE,6,1,1957) 23356 6 9 34.6+-1.8 n/10**4fis. ( two refs.) 23356 6 10 G.R.Keepin+,Physics and Nuclear Kinetics,ch.4, 23356 6 11 Addison-Wesley publishing Co., 1965 . 23356 6 12 37.9+-8.3 n/10**4fis. 23356 6 13 (A,23362002,H.D.Schuessler+,C,69VIENNA,,591,1969) 23356 6 14 34.6+-1.8 n/10**4fis. 23356 6 15 (R,,W.L.Talbert Jr+,J,PR,177,1805,1969) 23356 6 16 141Cs (24.9 sec) delayed neutron yield 23356 6 17 ASSUMED (ASSUM,92-U-235(N,F)55-CS-141,DL/CUM,NU) 23356 6 18 ERR-ANALYS (DATA-ERR) Type of error is not explained in the 23356 6 19 article. 23356 6 20 STATUS (TABLE) Text, page 7 and Table 2 of 23356 6 21 J.Radiochim.Acta,16,4,1971 23356 6 22 ENDBIB 20 0 23356 6 23 COMMON 3 3 23356 6 24 EN-DUMMY ASSUM ASSUM-ERR 23356 6 25 EV PC/FIS PC/FIS 23356 6 26 0.0253 0.32E-2 0.06E-2 23356 6 27 ENDCOMMON 3 0 23356 6 28 DATA 3 1 23356 6 29 GRP-NUM DATA DATA-ERR 23356 6 30 NO-DIM PC/FIS PC/FIS 23356 6 31 2. 38.3E-2 3.0E-2 23356 6 32 ENDDATA 3 0 23356 6 33 ENDSUBENT 32 0 23356 699999 SUBENT 23356007 20171113 226823356 7 1 BIB 6 18 23356 7 2 REACTION (35-BR-87(0,B-)36-KR-87,,PN) 23356 7 3 DECAY-DATA (36-KR-87,76.4MIN,DG,403.,0.597) 59.7+-3.0 % 23356 7 4 ANALYSIS Result of 7 measurements. 23356 7 5 Calculated from the ratio of neutron activity divided 23356 7 6 by the delayed neutron intensity (measured) to the 23356 7 7 absolute activity of gamma -ray from the daughter 23356 7 8 corrected for growth-decay; activities extrapolated 23356 7 9 back to the rare gas separation time. This ratio 23356 7 10 yielded the Pn/(1-Pn) . 23356 7 11 REL-REF (D,41617002,P.M.Aron+,J,AE,16,368,1964) 23356 7 12 (D,41617002,P.M.Aron+,J,SJA,16,447,1964) 23356 7 13 Engl.translation of AE,16,368,1964 23356 7 14 3.1+-0.6 % 23356 7 15 (A,23362007,H.D.Schuessler+,C,69VIENNA,,591,1969) 23356 7 16 2.4+-0.1 % ( calculated ) 23356 7 17 ERR-ANALYS (DATA-ERR) Type of error is not explained in article 23356 7 18 STATUS (TABLE) Text, page 7 and Table 2 of 23356 7 19 J.Radiochim.Acta,16,4,1971 23356 7 20 ENDBIB 18 0 23356 7 21 NOCOMMON 0 0 23356 7 22 DATA 2 1 23356 7 23 DATA DATA-ERR 23356 7 24 NO-DIM NO-DIM 23356 7 25 0.021 0.003 23356 7 26 ENDDATA 3 0 23356 7 27 ENDSUBENT 26 0 23356 799999 SUBENT 23356008 20171113 226823356 8 1 BIB 6 18 23356 8 2 REACTION (53-I-137(0,B-)54-XE-137,,PN) 23356 8 3 DECAY-DATA (54-XE-137,3.85MIN,DG,456.,0.31) 31.+-3. % 23356 8 4 ANALYSIS Result of 5 measurements. 23356 8 5 Calculated from the ratio of neutron activity divided 23356 8 6 by the delayed neutron intensity (measured) to the 23356 8 7 absolute activity of gamma -ray from the daughter 23356 8 8 corrected for growth-decay; activities extrapolated 23356 8 9 back to the rare gas separation time. This ratio 23356 8 10 yielded the Pn/(1-Pn) . 23356 8 11 REL-REF (D,41617005,P.M.Aron+,J,AE,16,368,1964) 23356 8 12 (D,41617005,P.M.Aron+,J,SJA,16,447,1964) 23356 8 13 Engl.translation of AE,16,368,1964 23356 8 14 3.0+-0.5 % 23356 8 15 (D,23362017,H.D.Schuessler+,C,69VIENNA,,591,1969) 23356 8 16 5.2+-0.5 % ( calculated ), 4.7+-1.0 % 23356 8 17 ERR-ANALYS (DATA-ERR) Type of error is not explained in article 23356 8 18 STATUS (TABLE) Text, page 7 and Table 2 of 23356 8 19 J.Radiochim.Acta,16,4,1971 23356 8 20 ENDBIB 18 0 23356 8 21 NOCOMMON 0 0 3 23356 8 22 DATA 2 1 23356 8 23 DATA DATA-ERR 23356 8 24 NO-DIM NO-DIM 23356 8 25 0.086 0.012 23356 8 26 ENDDATA 3 0 23356 8 27 ENDSUBENT 26 0 23356 899999 SUBENT 23356009 20201211 229623356 9 1 BIB 6 10 23356 9 2 REACTION (92-U-235(N,F)53-I-137,CUM,FY) 23356 9 3 DECAY-DATA (53-I-137,24.7SEC,DN,,0.086) 23356 9 4 Pn value with error is in Subent 008 23356 9 5 ANALYSIS Deduced as delayed neutron yield divided by Pn 23356 9 6 ERR-ANALYS (DATA-ERR) Type of error is not explained in article 23356 9 7 STATUS (TABLE) Text, page 7 of J.Radiochim.Acta,16,4,1971 23356 9 8 (DEP,23356008) Pn value 23356 9 9 (DEP,23356005) Delayed neutron yield for I-137. 23356 9 10 HISTORY (20201211U) SD: DECAY-DATA corrected (missed comma 23356 9 11 before intensity added). 23356 9 12 ENDBIB 10 0 23356 9 13 COMMON 1 3 23356 9 14 EN-DUMMY 23356 9 15 EV 23356 9 16 0.0253 23356 9 17 ENDCOMMON 3 0 23356 9 18 DATA 2 1 23356 9 19 DATA DATA-ERR 23356 9 20 PC/FIS PC/FIS 23356 9 21 3.3 0.5 23356 9 22 ENDDATA 3 0 23356 9 23 ENDSUBENT 22 0 23356 999999 SUBENT 23356010 20171113 226823356 10 1 BIB 5 9 23356 10 2 REACTION ((92-U-235(N,F)53-I-137,CUM,FY)/ 23356 10 3 (92-U-235(N,F)MASS,CHN,FY)) 23356 10 4 RESULT (FRCUM) 23356 10 5 REL-REF (A,,A.C.Wahl+,C,69VIENNA,,813,1969) 23356 10 6 58.+-1. % (calculated by semi-empirical method) 23356 10 7 ERR-ANALYS (DATA-ERR) Type of error is not explained in the 23356 10 8 article. 23356 10 9 STATUS (TABLE) Text, page 7 of J.Radiochim.Acta,16,4,1971 23356 10 10 (DEP,23356009) Fission yield for I-137 23356 10 11 ENDBIB 9 0 23356 10 12 COMMON 2 3 23356 10 13 EN-DUMMY MASS 23356 10 14 EV NO-DIM 23356 10 15 0.0253 137. 23356 10 16 ENDCOMMON 3 0 23356 10 17 DATA 2 1 23356 10 18 DATA DATA-ERR 23356 10 19 NO-DIM NO-DIM 23356 10 20 0.53 0.09 23356 10 21 ENDDATA 3 0 23356 10 22 ENDSUBENT 21 0 23356 1099999 ENDENTRY 10 0 2335699999999