ENTRY 30730 20090906 31403073000000001 SUBENT 30730001 20090906 31403073000100001 BIB 14 36 3073000100002 TITLE Fission neutron spectrum average cross sections of some3073000100003 threshold reactions on xenon 3073000100004 AUTHOR (J.H.Zaidi,H.M.A.Karim,S.M.Qaim) 3073000100005 INSTITUTE (3PAKNIL) 3073000100006 (2GERJUL) Third author 3073000100007 REFERENCE (J,RCA,38,123,1985) 3073000100008 SAMPLE High-purity xenon gas (99.999 %) 3073000100009 MONITOR ((MONIT1)26-FE-54(N,P)25-MN-54,,SIG,,FIS) 3073000100010 ((MONIT2)26-FE-56(N,P)25-MN-56,,SIG,,FIS) 3073000100011 ((MONIT3)27-CO-59(N,G)27-CO-60,,SIG,,FIS) 3073000100012 ((MONIT4)28-NI-58(N,P)27-CO-58,,SIG,,FIS) 3073000100013 ((MONIT5)28-NI-60(N,P)27-CO-60,,SIG,,FIS) 3073000100014 FACILITY (REAC,3PAKNIL) 5 MW swimming pool reactor 3073000100015 METHOD (ACTIV,CHSEP) Cross sections were measured by 3073000100016 activation using radiochemical separation 3073000100017 DETECTOR (GELI) 30 cm3 Co-axial Ge(Li) detector 3073000100018 (GE-IN) Intrinsic Ge detector (active area 2 cm2) 3073000100019 CORRECTION -Radiochemical yields 3073000100020 -Gamma-ray branchings 3073000100021 -Efficiencies of detectors 3073000100022 -Geometry of counting 3073000100023 -Absorption and self-absorption 3073000100024 ERR-ANALYS (ERR-T) Total error 3073000100025 The overall error for each reaction cross section was 3073000100026 obtained by summing the individual errors in quadrature3073000100027 Total uncertainty includes following 3073000100028 sources of errors % 3073000100029 (ERR-1) Neutron flux densities 12. 3073000100030 (ERR-2) Number of target nuclei 2. 3073000100031 (ERR-3) Irradiation and cooling times 1. 3073000100032 INC-SPECT Neutron spectrum used in irradiations was 3073000100033 approximately a fission spectrum. 3073000100034 STATUS (TABLE) Data taken from Radiochim.Acta,38(1985)pag.123,3073000100035 Tab.3. 3073000100036 HISTORY (19880314C) DG.- 3073000100037 (20090725A) SD:Updated to new date formats,lower case. 3073000100038 ENDBIB 36 0 3073000100039 COMMON 14 9 3073000100040 EN-MEAN MONIT1 MONIT1-ERR MONIT2 MONIT2-ERR MONIT3 3073000100041 MONIT3-ERR MONIT4 MONIT4-ERR MONIT5 MONIT5-ERR ERR-1 3073000100042 ERR-2 ERR-3 3073000100043 MEV MB MB MB MB B 3073000100044 B MB MB MB MB PER-CENT 3073000100045 PER-CENT PER-CENT 3073000100046 1.5 82.5 5. 1.07 0.08 37. 3073000100047 2. 113. 7.0 2.3 0.4 12. 3073000100048 2. 1. 3073000100049 ENDCOMMON 9 0 3073000100050 ENDSUBENT 49 0 3073000199999 SUBENT 30730002 20090906 31403073000200001 BIB 4 8 3073000200002 REACTION (54-XE-124(N,P)53-I-124,,SIG,,FIS) 3073000200003 DECAY-DATA (53-I-124,4.15D,DG,603.,0.61, 3073000200004 DG,1691.,0.105) 3073000200005 COMMENT 'Authors comment' 3073000200006 I-124 should be formed primarily via Xe-124(n,p) and 3073000200007 the contribution of Xe-126(n,t) should be negligibly 3073000200008 small. 3073000200009 ERR-ANALYS (ERR-4) Uncertainty due to decay rate determination 3073000200010 ENDBIB 8 0 3073000200011 NOCOMMON 0 0 3073000200012 DATA 3 1 3073000200013 DATA ERR-4 ERR-T 3073000200014 MB PER-CENT MB 3073000200015 1.024 5. 0.080 3073000200016 ENDDATA 3 0 3073000200017 ENDSUBENT 16 0 3073000299999 SUBENT 30730003 20090906 31403073000300001 BIB 4 12 3073000300002 REACTION (54-XE-126(N,P)53-I-126,,SIG,,FIS) 3073000300003 DECAY-DATA (53-I-126,13.02D,DG,389.,0.35) 3073000300004 ERR-ANALYS (ERR-4) Uncertainty due to decay rate determination 3073000300005 COMMENT 'Authors comment' 3073000300006 I-126 can be formed via two routes,namely Xe-126(n,p) 3073000300007 and the depletion of I-125 via I-125(n,g) during the 3073000300008 irradiation. The relative proportion of I-126 formed 3073000300009 via I-125(n,g) turned out to be much higher than that 3073000300010 via Xe-126(n,p). 3073000300011 The cross-section measurement of the Xe-126(n,p)I-126 3073000300012 reaction would therefore contain a relatively large 3073000300013 error. 3073000300014 ENDBIB 12 0 3073000300015 NOCOMMON 0 0 3073000300016 DATA 3 1 3073000300017 DATA ERR-3 ERR-T 3073000300018 MB PER-CENT MB 3073000300019 0.363 50. 0.200 3073000300020 ENDDATA 3 0 3073000300021 ENDSUBENT 20 0 3073000399999 SUBENT 30730004 20090906 31403073000400001 BIB 4 8 3073000400002 REACTION (54-XE-130(N,P)53-I-130,,SIG,,FIS) 3073000400003 DECAY-DATA (53-I-130-G,12.36HR,DG,536.,0.99, 3073000400004 DG,739.,0.823) 3073000400005 ERR-ANALYS (ERR-4) Uncertainty due to decay rate determination 3073000400006 COMMENT 'Authors comment' 3073000400007 I-130 should be formed primarily via Xe-130(n,p) and 3073000400008 the contribution of Xe-131(n,d)+(n,np)+(n,pn)I-130 3073000400009 processes should be negligibly small. 3073000400010 ENDBIB 8 0 3073000400011 NOCOMMON 0 0 3073000400012 DATA 3 1 3073000400013 DATA ERR-4 ERR-T 3073000400014 MB PER-CENT MB 3073000400015 0.005 5. 0.001 3073000400016 ENDDATA 3 0 3073000400017 ENDSUBENT 16 0 3073000499999 SUBENT 30730005 20090906 31403073000500001 BIB 4 7 3073000500002 REACTION (54-XE-131(N,P)53-I-131,,SIG,,FIS) 3073000500003 DECAY-DATA (53-I-131,8.04D,DG,364.,0.81) 3073000500004 ERR-ANALYS (ERR-4) Uncertainty due to decay rate determination 3073000500005 COMMENT 'Authors comment' 3073000500006 I-131 should be formed primarily via Xe-131(n,p) and 3073000500007 the contribution of Xe-132(n,d)+(n,np)+(n,pn)I-131 3073000500008 processes should be negligibly small. 3073000500009 ENDBIB 7 0 3073000500010 NOCOMMON 0 0 3073000500011 DATA 3 1 3073000500012 DATA ERR-4 ERR-T 3073000500013 MB PER-CENT MB 3073000500014 0.007 5. 0.001 3073000500015 ENDDATA 3 0 3073000500016 ENDSUBENT 15 0 3073000599999 SUBENT 30730006 20090906 31403073000600001 BIB 4 16 3073000600002 REACTION (54-XE-124(N,2N)54-XE-123,,SIG,,FIS) 3073000600003 DECAY-DATA (53-I-123,13.02HR,DG,159.,0.829) 3073000600004 I-123 is the daughter of Xe-123(2.0hr) 3073000600005 ERR-ANALYS (ERR-4) Uncertainty due to decay rate determination 3073000600006 COMMENT 'Authors comment' 3073000600007 I-123 could be formed through the decay of Xe-123 via 3073000600008 Xe-124(n,2n)Xe-123 and also from 3073000600009 Xe-124(n,d)+(n,np)+(n,pn)I-123 process. 3073000600010 Using radiochemical separation method and different 3073000600011 cooling time was found t-max(decay time at which the 3073000600012 maximum I-123 activity occurs) and then the ratio 3073000600013 of the two processes. The ratio was found to be more 3073000600014 than 1000 for I-123 formed through the decay 3073000600015 of Xe-123. Then the contribution of the 3073000600016 Xe-124(n,d)+(n,np)+(n,pn)I-123 process was 3073000600017 considered negligible. 3073000600018 ENDBIB 16 0 3073000600019 NOCOMMON 0 0 3073000600020 DATA 3 1 3073000600021 DATA ERR-4 ERR-T 3073000600022 MB PER-CENT MB 3073000600023 0.212 20. 0.044 3073000600024 ENDDATA 3 0 3073000600025 ENDSUBENT 24 0 3073000699999 ENDENTRY 6 0 3073099999999