ENTRY 30944 20090914 31413094400000001 SUBENT 30944001 20090914 31413094400100001 BIB 15 71 3094400100002 TITLE Neutron-induced fission of actinium-227, 3094400100003 protactinium-231, and neptunium-237: mass distribution 3094400100004 AUTHOR (R.S.Iyer,H.C.Jain,M.N.Namboodiri,M.R.Rajkishore, 3094400100005 M.V.Ramaniah,C.L.Rao,N.Ravindran,H.D.Sharma) 3094400100006 INSTITUTE (3INDTRM) 3094400100007 REFERENCE (C,65SALZBURG,1,439,196503) 3094400100008 FACILITY (REAC,3INDTRM) Apsara, fixed irradiation position 3094400100009 INC-SPECT Thermal reactor spectrum with essentially the 3094400100010 (degraded) fission spectrum part causing fissions in 3094400100011 Ac-227, Pa-231 and Np-237. 3094400100012 Irradiation times: 8 to 48 hrs. 3094400100013 METHOD (RVAL).Relative to U-235 thermal fission (monitor). 3094400100014 Samples and monitor are irradiated and counted (almost)3094400100015 simultaneously and mounted in the same way in order 3094400100016 to avoid corrections and minimize uncertainties. 3094400100017 (RCHEM) 3094400100018 (BSPEC) 3094400100019 DETECTOR (PROPC).Sugarman type methane flow beta p.c. with 3094400100020 plastic scintillator cosmic-ray guard. 3094400100021 ANALYSIS Measured R-values were converted to relative yields 3094400100022 using U-235 yields from literature and assumed values 3094400100023 for the reference yields of the respective fission 3094400100024 reactions. They could not be converted to absolute 3094400100025 yields due to insufficient number of yield points. 3094400100026 Numerical values of measured R-values were not 3094400100027 published. Relative yields were calculated from 3094400100028 measuered R-values (=R(x)) according to: 3094400100029 Y(x,Ac) = R(x) * Y(x,U) * Y(91,Ac) / Y(91,U) 3094400100030 equivalent to: 3094400100031 Data = R(x) * Monit2 * Assum / Monit1 3094400100032 CORRECTION Several corrections are mentioned but were not applied:3094400100033 1. Contribution of U-238 fast fissions in the natural 3094400100034 uranium sample, which would require corrections in 3094400100035 the form of an increase of relative yields in the 3094400100036 mass range 103-125 by 3-15%. 3094400100037 2. Differences in genetic relationships and the charge 3094400100038 distributions between U-235 and the other reactions.3094400100039 ERR-ANALYS Error contributions are mentioned but individual errors3094400100040 are not assessed: 3094400100041 1. Errors of U-235 reference yields 3094400100042 2. U-238 fast fissions not corrected for (see: 3094400100043 'CORRECTION') 3094400100044 3. Sample mounting, counting geometry 3094400100045 4. Counting statistics 3094400100046 5. Differences in genetic relationships and charge 3094400100047 distributions (see: 'CORRECTION') are considered to 3094400100048 lead to minor errors only. 3094400100049 The total errors of yield values are estimated to be 3094400100050 about 20%, although the internal consistency of the 3094400100051 data is reported to be much better (see: analysis). 3094400100052 no individual errors given by authors. 3094400100053 DECAY-DATA No information given as it is assumed that for this 3094400100054 method no decay corrections are required. 3094400100055 COMMENT by compiler (ML): No isomeric states are indicated in 3094400100056 the publication. In the data Table the ground state is 3094400100057 assumed in all cases where isomeric states exist. 3094400100058 However, if existing isomeric states were unknown at 3094400100059 the time of the experiment or ignored, additional 3094400100060 uncertainties have to be taken into account. 3094400100061 STATUS (RIDER).Reference 65IYE1 (originally in conversion); 3094400100062 in update by ML Table 1 of 65Salzburg,1,439, was used. 3094400100063 HISTORY (19881017T).Converted to Exfor90265; 3094400100064 (19911217A).ML: Converted to regular EXFOR and updated:3094400100065 - Bib section completed; 3094400100066 - Subentries reduced to 1 each for Ac-2273094400100067 Pa-231 and Np-237; 3094400100068 - Reactions and data tables revised. 3094400100069 (19911217A).ML: U-235 reference yields added 3094400100070 (19940712A) HW.- Free text added to 'ANALYSYS', keyword3094400100071 'RESULT' removed in subents 002-004.- 3094400100072 (20090912A) SD:Updated to new date formats,lower case. 3094400100073 ENDBIB 71 0 3094400100074 COMMON 1 3 3094400100075 EN-DUMMY 3094400100076 EV 3094400100077 1.0 E+06 3094400100078 ENDCOMMON 3 0 3094400100079 ENDSUBENT 78 0 3094400199999 SUBENT 30944002 20090914 31413094400200001 BIB 10 29 3094400200002 REACTION (89-AC-227(N,F)ELEM/MASS,CUM,FY,,REL/FIS) 3094400200003 MONITOR ((MONIT1)92-U-235(N,F)38-SR-91,CUM,FY,,MXW) 3094400200004 ((MONIT2)92-U-235(N,F)ELEM/MASS,CUM,FY,,MXW) 3094400200005 Numerical values not given in publication, taken 3094400200006 from Monit-ref by the compiler. 3094400200007 Comment by compiler: in Monit-ref, 2 values are given 3094400200008 for the Ba-140 monitor yield. In the data Table, the 3094400200009 value of 6.44 was used as this value was taken by the3094400200010 authors for Pa-231 and Np-237 reference yields. 3094400200011 MONIT-REF (,E.K.HYDE,R,UCRL-9036,1960) 3094400200012 ASSUMED (ASSUM,89-AC-227(N,F)38-SR-91,CUM,FY,,FIS) 3094400200013 The reference yield ratio was arbitrarily chosen: 3094400200014 Y(91,Ac)/Y(91,U) = 1 3094400200015 SAMPLE Ra-226 content < 0.1 % 3094400200016 Target covered with thin aluminium foils and wrapped 3094400200017 in aluminium catcher foils. 3094400200018 CORRECTION Up to 7% to account for differences in the fraction 3094400200019 of fission fragments stopped in the spacer foils 3094400200020 (0.4 mg/cm2, Ac-227 only). 3094400200021 MISC-COL Number of determinations 3094400200022 FLAG (1.) In the mass range 103 to 125 the relative yields 3094400200023 should be increased by 3-15% (see correction). 3094400200024 COMMENT by compiler (ML): The original entry Exfor90265 as 3094400200025 converted from the Rider file contained a subentry 3094400200026 according to which the yield for Sr-91 had been 3094400200027 determined directly and absolutely. However, according 3094400200028 to the original publication the data were obtained as 3094400200029 stated above (see ANALYSIS, ASSUMED). 3094400200030 HISTORY (19940712A) HW.- Keyword 'RESULT' removed.- 3094400200031 ENDBIB 29 0 3094400200032 COMMON 2 3 3094400200033 MONIT1 ASSUM 3094400200034 PC/FIS ARB-UNITS 3094400200035 5.81 5.81 3094400200036 ENDCOMMON 3 0 3094400200037 DATA 7 12 3094400200038 ELEMENT MASS ISOMER DATA MONIT2 MISC 3094400200039 FLAG 3094400200040 NO-DIM NO-DIM NO-DIM ARB-UNITS PC/FIS NO-DIM 3094400200041 NO-DIM 3094400200042 35.0000 83.0000 7.0100 0.510 3.0003094400200043 3094400200044 38.0000 89.0000 8.0200 4.790 4.0003094400200045 3094400200046 40.0000 97.0000 0.3200 5.900 2.0003094400200047 3094400200048 42.0000 99.0000 0.1100 6.060 1.0003094400200049 3094400200050 44.0000 105. 0.0840 0.900 2.0003094400200051 1.0000 3094400200052 46.0000 109. 0.2400 0.030 3.0003094400200053 1.0000 3094400200054 47.0000 111. 0.0000 0.1800 0.019 6.0003094400200055 1.0000 3094400200056 47.0000 112. 0.1700 0.010 5.0003094400200057 1.0000 3094400200058 50.0000 121. 0.0000 0.1200 0.015 1.0003094400200059 1.0000 3094400200060 52.0000 132. 5.1300 4.700 1.0003094400200061 3094400200062 56.0000 140. 8.4800 6.440 3.0003094400200063 3094400200064 58.0000 143. 6.1000 5.700 2.0003094400200065 3094400200066 ENDDATA 28 0 3094400200067 ENDSUBENT 66 0 3094400299999 SUBENT 30944003 20090914 31413094400300001 BIB 9 25 3094400300002 REACTION (91-PA-231(N,F)ELEM/MASS,CUM,FY,,REL/FIS) 3094400300003 MONITOR ((MONIT1)92-U-235(N,F)56-BA-140,CUM,FY,,MXW) 3094400300004 ((MONIT2)92-U-235(N,F)ELEM/MASS,CUM,FY,,MXW) 3094400300005 Numerical values not given in publication, taken 3094400300006 from Monit-ref by the compiler. 3094400300007 Comment by compiler: In Monit-ref, no value is given 3094400300008 for the Ag-113 reference yield. 3094400300009 MONIT-REF (,E.K.HYDE,R,UCRL-9036,1960) 3094400300010 ASSUMED (ASSUM,91-PA-231(N,F)56-BA-140,CUM,FY,,FIS) 3094400300011 The reference yield ratio was arbitrarily chosen: 3094400300012 Y(140,Pa)/Y(140,U) = 1 3094400300013 SAMPLE Uranium content < 0.1 % 3094400300014 Aliquots evaporated in quartz ampoules and wrapped 3094400300015 in cadmium foils. 3094400300016 COMMENT by compiler (ML): The original entry Exfor90265 as 3094400300017 converted from the Rider file contained a subentry 3094400300018 according to which the yield for Ba-140 had been 3094400300019 determined directly and absolutely. However, according 3094400300020 to the original publication the data were obtained as 3094400300021 stated above (see ANALYSIS, ASSUMED). 3094400300022 MISC-COL Number of determinations 3094400300023 FLAG (1.) In the mass range 103 to 125 the relative yields 3094400300024 should be increased by 3-15% (see correction). 3094400300025 HISTORY (19940712A) HW.- Keyword 'result' removed, code 'rel' 3094400300026 added in sf8.- 3094400300027 ENDBIB 25 0 3094400300028 COMMON 2 3 3094400300029 MONIT1 ASSUM 3094400300030 PC/FIS ARB-UNITS 3094400300031 6.44 6.44 3094400300032 ENDCOMMON 3 0 3094400300033 DATA 7 17 3094400300034 ELEMENT MASS ISOMER DATA MONIT2 MISC 3094400300035 FLAG 3094400300036 NO-DIM NO-DIM NO-DIM ARB-UNITS PC/FIS NO-DIM 3094400300037 NO-DIM 3094400300038 38.0000 89.0000 6.8300 4.790 4.0003094400300039 3094400300040 38.0000 91.0000 6.7900 5.810 2.0003094400300041 3094400300042 41.0000 97.0000 4.1800 5.900 1.0003094400300043 3094400300044 42.0000 99.0000 2.4000 6.060 3.0003094400300045 3094400300046 44.0000 103. 0.3000 3.000 3.0003094400300047 1.0000 3094400300048 44.0000 105. 0.1400 0.900 4.0003094400300049 1.0000 3094400300050 44.0000 106. 0.1000 0.380 2.0003094400300051 1.0000 3094400300052 46.0000 109. 0.0000 0.0770 0.030 3.0003094400300053 1.0000 3094400300054 46.0000 112. 0.0560 0.010 3.0003094400300055 1.0000 3094400300056 47.0000 111. 0.0000 0.0920 0.019 3.0003094400300057 1.0000 3094400300058 47.0000 113. 0.0000 0.0710 3.0003094400300059 1.0000 3094400300060 48.0000 115. 0.0000 0.0740 0.010 2.0003094400300061 1.0000 3094400300062 50.0000 121. 0.0000 0.0880 0.015 2.0003094400300063 1.0000 3094400300064 51.0000 127. 1.0000 0.130 2.0003094400300065 3094400300066 52.0000 129. 0.0000 1.1600 0.900 1.0003094400300067 3094400300068 52.0000 132. 3.1600 4.700 3.0003094400300069 3094400300070 58.0000 143. 5.6600 5.700 2.0003094400300071 3094400300072 ENDDATA 38 0 3094400300073 ENDSUBENT 72 0 3094400399999 SUBENT 30944004 20090914 31413094400400001 BIB 9 32 3094400400002 REACTION (93-NP-237(N,F)ELEM/MASS,CUM,FY,,REL/FIS) 3094400400003 MONITOR ((MONIT1)92-U-235(N,F)56-BA-140,CUM,FY,,MXW) 3094400400004 ((MONIT2)92-U-235(N,F)ELEM/MASS,CUM,FY,,MXW) 3094400400005 Numerical values not given in publication, taken 3094400400006 from Monit-ref by the compiler. 3094400400007 Comment by compiler: In Monit-ref, no value is given 3094400400008 for the Ag-113 reference yield. 3094400400009 MONIT-REF (,E.K.HYDE,R,UCRL-9036,1960) 3094400400010 ASSUMED (ASSUM,93-NP-237(N,F)56-BA-140,CUM,FY,,FIS) 3094400400011 The reference yield ratio was arbitrarily chosen: 3094400400012 Y(140,Np)/Y(140,U) = 1 3094400400013 SAMPLE Found to contain small quantities of Pu-139; therefore 3094400400014 further purified and no detecTable amounts of Pu left. 3094400400015 Aliquots evaporated in quartz ampoules and wrapped 3094400400016 in cadmium foils. 3094400400017 COMMENT by compiler (ML): The original entry Exfor90265 as 3094400400018 converted from the Rider file contained 2 subentries 3094400400019 according to which the yields for A=125 and Ce-144 had 3094400400020 been determined directly and absolutely, 1 subentry 3094400400021 with the Ce-141 yield relative to the Ce-144 yield, and3094400400022 1 subentry with the Ru-103 and Ru-106 yields relative 3094400400023 to the Ru-105 yield. Under reference '65IYE1' in the 3094400400024 Rider file only 65Salzburg,1,439 is given. However, in 3094400400025 that publication (used also here) there is no 3094400400026 indication of any measurements other than R-values 3094400400027 relative to Ba-140. Therefore the data as found in the 3094400400028 original publication (Table 1 of 65Salzburg) are 3094400400029 presented in this revised version of the entry. 3094400400030 MISC-COL Number of determinations 3094400400031 FLAG (1.) In the mass range 103 to 125 the relative yields 3094400400032 should be increased by 3-15% (see correction). 3094400400033 HISTORY (19940712A) HW.- Keyword 'result' removed.- 3094400400034 ENDBIB 32 0 3094400400035 COMMON 2 3 3094400400036 MONIT1 ASSUM 3094400400037 PC/FIS ARB-UNITS 3094400400038 6.44 6.44 3094400400039 ENDCOMMON 3 0 3094400400040 DATA 7 19 3094400400041 ELEMENT MASS ISOMER DATA MONIT2 MISC 3094400400042 FLAG 3094400400043 NO-DIM NO-DIM NO-DIM ARB-UNITS PC/FIS NO-DIM 3094400400044 NO-DIM 3094400400045 35.0000 83.0000 0.4300 0.510 1.0003094400400046 3094400400047 38.0000 89.0000 2.9600 4.790 2.0003094400400048 3094400400049 38.0000 91.0000 4.6000 5.810 2.0003094400400050 3094400400051 42.0000 99.0000 7.8300 6.060 2.0003094400400052 3094400400053 44.0000 103. 5.4800 3.000 2.0003094400400054 1.000 3094400400055 44.0000 105. 3.2300 0.900 3.0003094400400056 1.000 3094400400057 44.0000 106. 2.0600 0.380 2.0003094400400058 1.000 3094400400059 46.0000 109. 0.0000 0.4500 0.030 2.0003094400400060 1.000 3094400400061 46.0000 112. 0.0630 0.010 2.0003094400400062 1.000 3094400400063 47.0000 111. 0.0000 0.1300 0.019 2.0003094400400064 1.000 3094400400065 47.0000 113. 0.0000 0.0570 1.0003094400400066 1.000 3094400400067 48.0000 115. 0.0000 0.0610 0.010 2.0003094400400068 1.000 3094400400069 50.0000 121. 0.0000 0.0780 0.015 2.0003094400400070 1.000 3094400400071 50.0000 125. 0.0000 0.1240 0.013 2.0003094400400072 1.000 3094400400073 51.0000 127. 0.5950 0.130 1.0003094400400074 3094400400075 52.0000 129. 0.0000 3.1800 0.900 1.0003094400400076 3094400400077 52.0000 132. 5.6500 4.700 1.0003094400400078 3094400400079 58.0000 141. 4.3100 6.000 1.0003094400400080 3094400400081 58.0000 144. 2.9000 5.700 1.0003094400400082 3094400400083 ENDDATA 42 0 3094400400084 ENDSUBENT 83 0 3094400499999 ENDENTRY 4 0 3094499999999