ENTRY 23549 20200415 22872354900000001 SUBENT 23549001 20200415 22872354900100001 BIB 14 31 2354900100002 TITLE Light mass yields in the 14 MeV neutron fission of 2354900100003 U-235 2354900100004 AUTHOR (D.G.Vallis,A.O.Thomas) 2354900100005 REFERENCE (R,AWRE-O-58/61,1961) 2354900100006 REL-REF (M,,A.O.Thomas+,R,AWRE-O-25/61,1961) 2354900100007 Counters and counting technique. 2354900100008 INSTITUTE (2UK ALD,2UK HAR) 2354900100009 FACILITY (CCW,2UK ALD) 2354900100010 INC-SOURCE (D-T) Thick Zr-T target bombarded by 200 kV deuterons. 2354900100011 INC-SPECT 5.E+9 - 2.E+10 n/s. 2354900100012 Neutron flux was monitored by alphas from D-T reaction 2354900100013 at 177 deg angle to deuteron beam; the greatest rate of2354900100014 the flux decline ~12% of the initial flux per hour. 2354900100015 SAMPLE .U-235. uranyl nitrate or chloride in nitric or 2354900100016 hydrochloric acid solution in a 2 ml capacity Perspex 2354900100017 cell, disc-shaped, 25 mm diameter, 3 mm thick, 2354900100018 0.5 mm wall thickness, cooled by cold air. 2354900100019 Isotopic composition: U-235 - 92.86, U-238 - 5.76, 2354900100020 U-234 - 1.20, U-236 - 0.18 atoms %. 2354900100021 . Fe. 91.40+-0.20 mg iron/g. 2354900100022 DETECTOR (PROPC) Two types of end-window beta counter - 2354900100023 low background Van Duuren and flow proportional counter2354900100024 - calibrated over wide range of beta energy against 2354900100025 4PI and beta-gamma coincidence counting techniques. 2354900100026 For Mo-99 and Mn-56 - calibrated by 4PI counter. 2354900100027 METHOD (CHSEP) Radiochemical separation using 1 mg of carrier 2354900100028 element. Details are given in AWRE-O-58/61,1961. 2354900100029 CORRECTION For flux decay. 2354900100030 For contribution from U-238. U-236, U-234 neglected. 2354900100031 ASSUMED (ASSUM,92-U-238(N,F)42-MO-99,IND,FY) 2354900100032 HISTORY (20200415C) M.M. 2354900100033 ENDBIB 31 0 2354900100034 COMMON 3 3 2354900100035 EN EN-ERR ASSUM 2354900100036 MEV MEV PC/FIS 2354900100037 14.7 0.2 5.70 2354900100038 ENDCOMMON 3 0 2354900100039 ENDSUBENT 38 0 2354900199999 SUBENT 23549002 20200415 22872354900200001 BIB 8 20 2354900200002 REACTION (92-U-235(N,F)42-MO-99,IND,FY) 2354900200003 METHOD (MOMIX) Fe and U solutions were mixed . For Mo-99 yield2354900200004 measurement. 2354900200005 MONITOR ((MONIT1)26-FE-56(N,P)25-MN-56,,SIG) For Mo-99 yield 2354900200006 ((MONIT2)92-U-235(N,F),,SIG) 2354900200007 ANALYSIS Average of 4 measurement 4.82, 5.18, 5.18, 5.61 . 2354900200008 COMMENT Of authors. 2354900200009 If take more recent value 2,15 b for U-235 fis.CS of 2354900200010 Adams+ and our Mo-99 yield results and 5.17 previously 2354900200011 published result, then Fe56(n,p) CS should be 107+-5 mb2354900200012 which agrees with 105.+-5 mb of Hughes+. 2354900200013 Of compiler. Decay data for Mo-88 and Mn-56 are not 2354900200014 given in the article. 2354900200015 REL-REF (N,,D.J.Hughes+,R,BNL-325,1958) 2354900200016 (N,,B.Adams+,J,JNE/AB,14,85,1961) 2354900200017 See comment of authors. 2354900200018 ERR-ANALYS (DATA-ERR) Type of error is not explained in the 2354900200019 article. 2354900200020 STATUS (TABLE) Text of Summary on page 1, text page 13 of 2354900200021 AWRE-O-58/61,1961 2354900200022 ENDBIB 20 0 2354900200023 NOCOMMON 0 0 2354900200024 DATA 4 1 2354900200025 DATA DATA-ERR MONIT1 MONIT2 2354900200026 PC/FIS PC/FIS MB B 2354900200027 5.2 0.5 114. 2.30 2354900200028 ENDDATA 3 0 2354900200029 ENDSUBENT 28 0 2354900299999 SUBENT 23549003 20200415 22872354900300001 BIB 6 21 2354900300002 REACTION (92-U-235(N,F)ELEM/MASS,IND,FY) 2354900300003 MONITOR (92-U-235(N,F)42-MO-99,IND,FY) 2354900300004 DECAY-DATA ((1.)35-BR-84-G,32.MIN) 2354900300005 ((2.)35-BR-83,2.3HR) 2354900300006 ((3.)35-BR-82-G,35.9HR) 2354900300007 ((4.)34-SE-81-M,57.MIN) 2354900300008 ((5.)33-AS-77,39.HR) 2354900300009 ((6.)31-GA-73,5.HR) 2354900300010 ((7.)30-ZN-72,49.HR) 2354900300011 ((8.)28-NI-66,56.HR) 2354900300012 FLAG (1.) Best value of 3 measurements: 1.03, 0.99, 0.93 2354900300013 (2.) Best value of 2 measurements: 0.86, 0.80 2354900300014 (3.) Best value of 2 measurements: 6.0E-4, 4.0E-4 2354900300015 (4.) Best value of 4 measurements: 2354900300016 0.071, 0.053, 0.048,0.044 2354900300017 (5.) Best value of 2 measurements: 0.072, 0.064 2354900300018 (6.) Best value of 2 measurements: 0.0115, 0.0114 2354900300019 REL-REF (A,,G.P.Ford+,R,LA-1997,1956) 2354900300020 (A,,A.C.Wahl,J,PR,99,730,1955) 2354900300021 Mainly agree - see Fig.2 of AWRE-O-58/61,1961 2354900300022 STATUS (TABLE) Table 1 of AWRE-O-58/61,1961 2354900300023 ENDBIB 21 0 2354900300024 COMMON 1 3 2354900300025 MONIT 2354900300026 PC/FIS 2354900300027 5.17 2354900300028 ENDCOMMON 3 0 2354900300029 DATA 6 8 2354900300030 ELEMENT MASS ISOMER DATA DECAY-FLAG FLAG 2354900300031 NO-DIM NO-DIM NO-DIM PC/FIS NO-DIM NO-DIM 2354900300032 35. 84. 0. 1.03 1. 1. 2354900300033 35. 83. 0.83 2. 2. 2354900300034 35. 82. 5.E-04 3. 3. 2354900300035 34. 81. 1. 0.051 4. 4. 2354900300036 33. 77. 0.068 5. 5. 2354900300037 31. 73. 0.0115 6. 6. 2354900300038 30. 72. 0.0078 7. 2354900300039 28. 66. 4.0E-04 8. 2354900300040 ENDDATA 10 0 2354900300041 ENDSUBENT 40 0 2354900399999 SUBENT 23549004 20200415 22872354900400001 BIB 4 6 2354900400002 REACTION (92-U-235(N,F)MASS,CHN,FY) 2354900400003 Total chain yield 2354900400004 ANALYSIS Derived from interpolation of the fission yield curve.2354900400005 ERR-ANALYS (DATA-ERR) Type of error is not explained in the 2354900400006 article. 2354900400007 STATUS (TABLE) Text page 14 of AWRE-O-58/61,1961 2354900400008 ENDBIB 6 0 2354900400009 NOCOMMON 0 0 2354900400010 DATA 3 2 2354900400011 MASS DATA DATA-ERR 2354900400012 NO-DIM PC/FIS PC/FIS 2354900400013 82. 0.50 0.05 2354900400014 81. 0.35 2354900400015 ENDDATA 4 0 2354900400016 ENDSUBENT 15 0 2354900499999 SUBENT 23549005 20200415 22872354900500001 BIB 4 7 2354900500002 REACTION (92-U-235(N,F)35-BR-82,IND,FY,,FRC) 2354900500003 ANALYSIS Derived from measured independent yield of Br-82 and 2354900500004 total chain yield of mass 82. 2354900500005 ERR-ANALYS (DATA-ERR) Type of error is not explained in the 2354900500006 article. 2354900500007 STATUS (TABLE) Text page 14 of AWRE-O-58/61,1961 2354900500008 (DEP,23549003) Independent yield of Br-82, flag 3. 2354900500009 ENDBIB 7 0 2354900500010 NOCOMMON 0 0 2354900500011 DATA 3 1 2354900500012 MASS DATA DATA-ERR 2354900500013 NO-DIM NO-DIM NO-DIM 2354900500014 82. 1.0E-03 0.2E-03 2354900500015 ENDDATA 3 0 2354900500016 ENDSUBENT 15 0 2354900599999 SUBENT 23549006 20200415 22872354900600001 BIB 3 7 2354900600002 REACTION ((92-U-235(N,F)34-SE-81,IND,FY)/ 2354900600003 (92-U-235(N,F)34-SE-81-M,IND,FY)) 2354900600004 ANALYSIS Derived from chain yield of mass 81 and independent 2354900600005 yield of Se-81-M. 2354900600006 STATUS (TABLE) Text page 14 of AWRE-O-58/61,1961 2354900600007 (DEP,23549004) Chain yield 2354900600008 (DEP,23549003) Independent yield of Se-81-M, flag 4. 2354900600009 ENDBIB 7 0 2354900600010 NOCOMMON 0 0 2354900600011 DATA 1 1 2354900600012 DATA 2354900600013 NO-DIM 2354900600014 5.9 2354900600015 ENDDATA 3 0 2354900600016 ENDSUBENT 15 0 2354900699999 ENDENTRY 6 0 2354999999999