ENTRY 22903 20060704 21782290300000001 SUBENT 22903001 20060704 21782290300100001 BIB 16 87 2290300100002 TITLE .Measurements of neutron-induced fission cross-sections2290300100003 of 205Tl, 204,206,207,208Pb and 209Bi with a multi- 2290300100004 section Frisch-gridded ionization chamber 2290300100005 AUTHOR (I.V.RYZHOV, G.A.TUTIN, V.P.EISMONT, A.G.MITRYUKHIN, 2290300100006 V.S.OPLAVIN, S.M.SOLOVIEV, J.BLOMGREN, P.-U.RENBERG, 2290300100007 J.-P.MEULDERS, Y.EL-MASRI, T.KEUTGEN, R.PRIEELS, 2290300100008 R.NOLTE) 2290300100009 REFERENCE (J,NIM/A,562,439,2006) Main reference, data are given 2290300100010 (C,2004SANTA,,684,2004) First publication, data from 2290300100011 Louvain 2290300100012 (C,2004SANTA,,937,2004) First publication, data from 2290300100013 TSL 2290300100014 INSTITUTE (4RUSRI ) Ryzhov, Tutin, EISMONT, MITRYUKHIN, OPLAVIN,2290300100015 SOLOVIEV 2290300100016 (2SWDUPP) Blomgren - Department of Neutron Research, 2290300100017 Uppsala University, Uppsala, Sweden 2290300100018 Renberg - The Svedberg Laboratory (TSL), 2290300100019 Uppsala University, Uppsala, Sweden 2290300100020 (2BLGLVN) Meulders, El Masri, Keutgen, Prieels -FNRS 2290300100021 and Institute of Nuclear Physics, Universitee 2290300100022 catholique de Louvain, Louvain-la-Neuve (LLN), Belgium2290300100023 (2GERPTB) Nolte - Physikalisch-Technische Bundes- 2290300100024 anstalt, Braunschweig, Germany 2290300100025 FACILITY 1(CYCLO,2BLGLVN) Louvain-La-Neuve (LLN) neutron beam 2290300100026 facility CYCLONE 2290300100027 2(CYCLO,2SWDUPP) TSL cyclotron, Uppsala 2290300100028 INC-SOURCE1(P-LI7) At the LLN facilitya 5-mm thick natural lithium2290300100029 target, (92.5% of 7Li and 7.5% of 6Li) was bombarded 2290300100030 by protons with beam current of about 10 mA. 2290300100031 2(P-LI7) In the TSL experiments, 4-15mm thick lithium 2290300100032 targets (enriched to 99.98% in 7Li) were 2290300100033 exposed to proton bombardment with a beam current 2290300100034 from 1 to 10 mA. 2290300100035 INC-SPECT .Quasi-monoenergetic neutrons with peak energies of 2290300100036 32.8, 45.3 and 59.9-MeV were produced by the 7Li(P,N) 2290300100037 reaction. The detector was so positioned that the 2290300100038 reference target was at a distance of 10.2 m from the 2290300100039 neutron production target. At this position the beam 2290300100040 diameter FWHM was about 10 cm with an average fluence 2290300100041 rate of peak neutrons. The present measurements were 2290300100042 performed with the following neutron peak energies: 2290300100043 32.8, 45.4, 59.9MeV at LLN, and 34.7, 46.3, 65.4, 2290300100044 96.0, 133.6 and 173.9 MeV at TSL. 2290300100045 METHOD (TOF,PHD) 2290300100046 DETECTOR (IOCH) Fission fragments were detected with a multi- 2290300100047 section frisch-gridded ionization chamber-mfgic. 2290300100048 The MFGIC is a stack of seven twin ionization chambers2290300100049 with Frisch grids. It is housed in a thin-walled 2290300100050 cylindrical detector shell of 200 mm diameter and 520 2290300100051 mm length. The anode and cathode are 50 mum thick 2290300100052 duralumin foils sandwiched between two rings with 2290300100053 inner and outer diameters of 140 and 170 mm, resp. 2290300100054 The gas mixture is composed of 90% argon and 10% 2290300100055 methane. The detector was located with sub-actinide 2290300100056 targets under study plus a natural uranium target as a2290300100057 reference target. 2290300100058 PART-DET (FF) Fission fragments were detected. 2290300100059 MONITOR (92-U-238(N,F),,SIG) 2290300100060 Neutron fluence measurements were based on the 2290300100061 U-238(N,F) standard. 2290300100062 SAMPLE .Sub-actinide targets plus a natural uranium target, 2290300100063 deposited in the form of uf(4) as a reference target. 2290300100064 The fissile materials were deposited, by thermal 2290300100065 vacuum evaporation, on each side of cathode foils 2290300100066 stretched between the supporting rings. The diameter 2290300100067 of each target was 80-mm. The total fissile mass of 2290300100068 the reference target was measured by alpha-counting, 2290300100069 while the masses of the sub-actinide targets, pure 2290300100070 metals, were determined by weighting. The total masses2290300100071 of fissile deposits for the backward/forward target 2290300100072 faces are indicated. 2290300100073 CORRECTION .Correction for the isotopic composition of the 2290300100074 target, correction for the target position along the 2290300100075 neutron beam axis was made. 2290300100076 The efficiency of the fission fragment detection was 2290300100077 obtained as the product of two correction factors 2290300100078 allowing for fission fragment absorption in the target2290300100079 and the loss of events due to pulse-height threshold. 2290300100080 ERR-ANALYS (ERR-1).For all targets, the uncertainty in the mass 2290300100081 was not larger than 2%. 2290300100082 (ERR-S) The cross section uncertainties are one 2290300100083 standard deviation. 2290300100084 .EN-RSL-FW. Full width as reported by authors. 2290300100085 STATUS ,From TABLE 2 of main reference 2290300100086 HISTORY (20051213C) S.M. 2290300100087 (20060704A) BIB-section Corrected and updated. 2290300100088 Data from 22903 and 22905 merged - SM 2290300100089 ENDBIB 87 0 2290300100090 COMMON 1 3 2290300100091 ERR-1 2290300100092 PER-CENT 2290300100093 2. 2290300100094 ENDCOMMON 3 0 2290300100095 ENDSUBENT 94 0 2290300199999 SUBENT 22903002 20060111 21782290300200001 BIB 2 6 2290300200002 REACTION 1(81-TL-205(N,F),,SIG) 2290300200003 2(81-TL-205(N,F),,SIG) 2290300200004 SAMPLE 1.Tl-205, forward target thickness is 70.4-mg, 2290300200005 backward target thickness is 69.6-mg. 2290300200006 2.Metallic Tl-205, abundance 99.8%, areal mass 2290300200007 1.38/1.40 mg/cm**2, was used as target. 2290300200008 ENDBIB 6 0 2290300200009 NOCOMMON 0 0 2290300200010 DATA 6 8 2290300200011 EN EN-RSL-FW DATA 1ERR-S 1DATA 2ERR-S 22290300200012 MEV MEV MB MB MB MB 2290300200013 32.8 1.8 0.004 0.003 2290300200014 34.7 1.4 0.025 0.0172290300200015 45.3 1.5 0.125 0.011 2290300200016 59.9 1.2 0.57 0.05 2290300200017 65.4 0.9 0.97 0.08 2290300200018 96.0 1.4 4.73 0.26 2290300200019 133.6 1.9 7.9 0.7 2290300200020 173.9 1.9 11.1 1.6 2290300200021 ENDDATA 10 0 2290300200022 ENDSUBENT 21 0 2290300299999 SUBENT 22903003 20060111 21782290300300001 BIB 2 6 2290300300002 REACTION 1(82-PB-204(N,F),,SIG) 2290300300003 2(82-PB-204(N,F),,SIG) 2290300300004 SAMPLE 1.Pb-204, forward target thickness is 27.7-mg, 2290300300005 backward target thickness is 26.0-mg. 2290300300006 2.Metallic Pb-204, abundance 66.5%, areal mass 2290300300007 0.52/0.55 mg/cm**2, was used as target. 2290300300008 ENDBIB 6 0 2290300300009 NOCOMMON 0 0 2290300300010 DATA 6 9 2290300300011 EN EN-RSL-FW DATA 1ERR-S 1DATA 2ERR-S 22290300300012 MEV MEV MB MB MB MB 2290300300013 32.8 1.8 0.26 0.04 2290300300014 34.7 1.4 0.46 0.132290300300015 45.3 1.5 2.19 0.09 2290300300016 46.3 1.1 2.58 0.152290300300017 59.9 1.2 7.5 0.4 2290300300018 65.4 0.9 11.1 0.7 2290300300019 96.0 1.4 30.3 1.7 2290300300020 133.6 1.9 46.2 3.4 2290300300021 173.9 1.9 61.7 4.8 2290300300022 ENDDATA 11 0 2290300300023 ENDSUBENT 22 0 2290300399999 SUBENT 22903004 20060111 21782290300400001 BIB 2 6 2290300400002 REACTION 1(82-PB-206(N,F),,SIG) 2290300400003 2(82-PB-206(N,F),,SIG) 2290300400004 SAMPLE 1.Pb-206, forward target thickness is 55.3-mg, 2290300400005 backward target thickness is 49.3-mg. 2290300400006 2.Metallic Pb-206, abundance 90.4%, areal mass 2290300400007 0.98/1.10 mg/cm**2, was used as target. 2290300400008 ENDBIB 6 0 2290300400009 NOCOMMON 0 0 2290300400010 DATA 6 9 2290300400011 EN EN-RSL-FW DATA 1ERR-S 1DATA 2ERR-S 22290300400012 MEV MEV MB MB MB MB 2290300400013 32.8 1.8 0.047 0.009 2290300400014 34.7 1.4 0.08 0.042290300400015 45.3 1.5 0.67 0.03 2290300400016 46.3 1.1 0.79 0.062290300400017 59.9 1.2 2.96 0.17 2290300400018 65.4 0.9 5.1 0.3 2290300400019 96.0 1.4 15.2 0.9 2290300400020 133.6 1.9 24.2 1.8 2290300400021 173.9 1.9 38.7 3.1 2290300400022 ENDDATA 11 0 2290300400023 ENDSUBENT 22 0 2290300499999 SUBENT 22903005 20060111 21782290300500001 BIB 2 6 2290300500002 REACTION 1(82-PB-207(N,F),,SIG) 2290300500003 2(82-PB-207(N,F),,SIG) 2290300500004 SAMPLE 1.Pb-207, forward target thickness is 49.2-mg, 2290300500005 backward target thickness is 48.3-mg. 2290300500006 2.Metallic Pb-207, abundance 93.2%, areal mass 2290300500007 0.96/0.98 mg/cm**2, was used as target. 2290300500008 ENDBIB 6 0 2290300500009 NOCOMMON 0 0 2290300500010 DATA 6 9 2290300500011 EN EN-RSL-FW DATA 1ERR-S 1DATA 2ERR-S 22290300500012 MEV MEV MB MB MB MB 2290300500013 32.8 1.8 0.028 0.009 2290300500014 34.7 1.4 0.035 0.0242290300500015 45.3 1.5 0.426 0.023 2290300500016 46.3 1.1 0.51 0.04 2290300500017 59.9 1.2 2.24 0.13 2290300500018 65.4 0.9 3.28 0.22 2290300500019 96.0 1.4 11.2 0.6 2290300500020 133.6 1.9 18.2 1.4 2290300500021 173.9 1.9 35.3 2.5 2290300500022 ENDDATA 11 0 2290300500023 ENDSUBENT 22 0 2290300599999 SUBENT 22903006 20060111 21782290300600001 BIB 2 6 2290300600002 REACTION 1(82-PB-208(N,F),,SIG) 2290300600003 2(82-PB-208(N,F),,SIG) 2290300600004 SAMPLE 1.Pb-208, forward target thickness is 54.1-mg, 2290300600005 backward target thickness is 44.1-mg. 2290300600006 2.Metallic Pb-208, abundance 99.0%, areal mass 2290300600007 0.88/1.08 mg/cm**2, was used as target. 2290300600008 ENDBIB 6 0 2290300600009 NOCOMMON 0 0 2290300600010 DATA 6 9 2290300600011 EN EN-RSL-FW DATA 1ERR-S 1DATA 2ERR-S 22290300600012 MEV MEV MB MB MB MB 2290300600013 32.8 1.8 0.012 0.006 2290300600014 34.7 1.4 0.029 0.0222290300600015 45.3 1.5 0.252 0.018 2290300600016 46.3 1.1 0.28 0.04 2290300600017 59.9 1.2 1.38 0.09 2290300600018 65.4 0.9 2.33 0.17 2290300600019 96.0 1.4 8.2 0.5 2290300600020 133.6 1.9 14.3 1.1 2290300600021 173.9 1.9 23.9 1.8 2290300600022 ENDDATA 11 0 2290300600023 ENDSUBENT 22 0 2290300699999 SUBENT 22903007 20060111 21782290300700001 BIB 3 8 2290300700002 REACTION 1(82-PB-0(N,F),,SIG,,,DERIV) 2290300700003 2(82-PB-0(N,F),,SIG,,,DERIV) 2290300700004 ANALYSIS .The Pb-natural data were derived from the 2290300700005 cross sections of the separate lead isotopes. 2290300700006 STATUS (DEP,22903003) 2290300700007 (DEP,22903004) 2290300700008 (DEP,22903005) 2290300700009 (DEP,22903006) 2290300700010 ENDBIB 8 0 2290300700011 NOCOMMON 0 0 2290300700012 DATA 6 9 2290300700013 EN EN-RSL-FW DATA 1ERR-S 1DATA 2ERR-S 22290300700014 MEV MEV MB MB MB MB 2290300700015 32.8 1.8 0.027 0.011 2290300700016 34.7 1.4 0.048 0.0252290300700017 45.3 1.5 0.418 0.025 2290300700018 46.3 1.1 0.49 0.05 2290300700019 59.9 1.2 2.04 0.14 2290300700020 65.4 0.9 3.32 0.24 2290300700021 96.0 1.4 10.9 0.7 2290300700022 133.6 1.9 18. 1.5 2290300700023 173.9 1.9 30.5 2.4 2290300700024 ENDDATA 11 0 2290300700025 ENDSUBENT 24 0 2290300799999 SUBENT 22903008 20060111 21782290300800001 BIB 2 6 2290300800002 REACTION 1(83-BI-209(N,F),,SIG) 2290300800003 2(83-BI-209(N,F),,SIG) 2290300800004 SAMPLE 1.Bi-209, forward target thickness is 43.8-mg, 2290300800005 backward target thickness is 57.2-mg. 2290300800006 2.Metallic Bi-209, abundance 100%, areal mass- 1.14/0.872290300800007 mg/cm**2, was used as target. 2290300800008 ENDBIB 6 0 2290300800009 NOCOMMON 0 0 2290300800010 DATA 6 9 2290300800011 EN EN-RSL-FW DATA 1ERR-S 1DATA 2ERR-S 22290300800012 MEV MEV MB MB MB MB 2290300800013 32.8 1.8 0.245 0.023 2290300800014 34.7 1.4 0.37 0.072290300800015 45.3 1.5 2.19 0.07 2290300800016 46.3 1.1 2.70 0.122290300800017 59.9 1.2 8.04 0.36 2290300800018 65.4 0.9 12.3 0.7 2290300800019 96.0 1.4 28.8 1.7 2290300800020 133.6 1.9 43.3 3.3 2290300800021 173.9 1.9 66.6 3.8 2290300800022 ENDDATA 11 0 2290300800023 ENDSUBENT 22 0 2290300899999 ENDENTRY 8 0 2290399999999