ENTRY 22993 20230518 231722993 0 1 SUBENT 22993001 20230518 231722993 1 1 BIB 7 123 22993 1 2 TITLE 243Am neutron-induced fission cross section in the 22993 1 3 fast neutron energy range 22993 1 4 AUTHOR (G.Kessedjian, G.Barreau, M.Aiche, B.Jurado, A.Bidaud, 22993 1 5 S.Czajkowski, D.Dassie, B.Haas, L.Mathieu, 22993 1 6 L.Tassan-Got, J.N.Wilson, F.-J.Hambsch, S.Oberstedt, 22993 1 7 I.AlMahamid, J.Floyd, W.Lukens, D.Shuh) 22993 1 8 INSTITUTE (2FR BOR) CENBG, Universite de Bordeaux 1, F-33175, 22993 1 9 Gradignan Cedex, France. M.Aiche, presenting author, 22993 1 10 Email: aiche@cenbg.in2p3.fr; 22993 1 11 G.Kessedjian, G.Barreau, B.Jurado, A.Bidaud, 22993 1 12 S.Czajkowski, D.Dassie, B.Haas, L.Mathieu 22993 1 13 (2FR PAR) IPN Orsay, Universite Paris-Sud, F-91406 22993 1 14 Orsay, France. L.Tassan-Got, J.Wilson 22993 1 15 (2ZZZGEL) EC-JRC-IRMM, B-2440 Geel, Belgium. 22993 1 16 F.-J.Hambsch, S.Oberstedt 22993 1 17 (1USABRK) LBNL, CA 94720, USA. J.Floyd, W.Lukens, 22993 1 18 D.Shuh 22993 1 19 (1USAUSA) Laboratory of Inorganic and Nuclear 22993 1 20 Chemistry, NY 12201, USA. I.AlMahamid 22993 1 21 REFERENCE (J,PR/C,85,044613,2012) Data Tables. 22993 1 22 #doi:10.1103/PhysRevC.85.044613 22993 1 23 (C,2007NICE,1,483,2007) 22993 1 24 #doi:10.1051/ndata:07473 22993 1 25 Graph for Am-243 fission cross section - 22993 1 26 measurement relative n-p scattering 22993 1 27 (S,EUR-22794,81,2007) Same data as C,2007NICE. 22993 1 28 COVARIANCE Correlation matrix of 243Am fission cross-section 22993 1 29 measurements for different neutron flux normalization. 22993 1 30 (XY,21,243Am fission c-s measurements,N,Subent,EN, 22993 1 31 Add-headings) 22993 1 32 N EN,MEV Subent Add-headings 22993 1 33 1 1.84 003 243Am(n,f)/(n,p) 22993 1 34 2 2.36 003 243Am(n,f)/(n,p) 22993 1 35 3 2.88 003 243Am(n,f)/(n,p) 22993 1 36 4 2.88 003 243Am(n,f)/(n,p) 22993 1 37 5 3.39 003 243Am(n,f)/(n,p) 22993 1 38 6 4.07 005 243Am(n,f)/(n,p) 22993 1 39 7 4.77 005 243Am(n,f)/(n,p) 22993 1 40 8 5.12 004 243Am(n,f)/(n,p) 22993 1 41 9 5.72 004 243Am(n,f)/(n,p) 22993 1 42 10 6.00 005 243Am(n,f)/(n,p) 22993 1 43 11 6.21 005 243Am(n,f)/(n,p) 22993 1 44 12 6.82 004 243Am(n,f)/(n,p) 22993 1 45 13 7.35 004 243Am(n,f)/(n,p) 22993 1 46 14 3.59 005 243Am(n,f)/(n,p) 22993 1 47 15 4.00 006 243Am(n,f)/235U(n,f) 22993 1 48 16 4.59 006 243Am(n,f)/235U(n,f) 22993 1 49 17 5.31 006 243Am(n,f)/235U(n,f) 22993 1 50 18 4.39 007 243Am(n,f)/238U(n,f) 22993 1 51 19 4.70 007 243Am(n,f)/238U(n,f) 22993 1 52 20 5.50 007 243Am(n,f)/238U(n,f) 22993 1 53 21 6.00 007 243Am(n,f)/238U(n,f) 22993 1 54 (Z,441,COR,NO-DIM) 22993 1 55 1. 0.96 0.98 0.98 0.98 0.39 0.01 0.42 0.47 0.47 0.41 22993 1 56 0.96 1. 0.98 0.97 0.97 0.38 0.40 0.42 0.47 0.47 0.40 22993 1 57 0.98 0.98 1. 0.99 0.99 0.38 0.39 0.42 0.48 0.48 0.40 22993 1 58 0.98 0.97 0.99 1. 0.99 0.40 0.41 0.43 0.48 0.48 0.40 22993 1 59 0.98 0.97 0.99 0.99 1. 0.39 0.40 0.43 0.48 0.47 0.41 22993 1 60 0.39 0.38 0.38 0.40 0.39 1. 0.79 0.84 0.45 0.45 0.81 22993 1 61 0.40 0.40 0.39 0.41 0.40 0.79 1. 0.84 0.46 0.46 0.83 22993 1 62 0.42 0.42 0.42 0.43 0.43 0.84 0.86 1. 0.49 0.49 0.88 22993 1 63 0.47 0.47 0.48 0.48 0.48 0.45 0.46 0.49 1. 1.00 0.47 22993 1 64 0.47 0.47 0.48 0.48 0.47 0.45 0.46 0.49 1.00 1. 0.47 22993 1 65 0.41 0.40 0.40 0.41 0.41 0.81 0.83 0.88 0.47 0.47 1. 22993 1 66 0.41 0.40 0.40 0.42 0.41 0.81 0.83 0.88 0.47 0.47 0.85 22993 1 67 0.42 0.41 0.41 0.43 0.42 0.43 0.44 0.47 0.92 0.91 0.45 22993 1 68 0.47 0.46 0.47 0.47 0.47 0.44 0.45 0.48 0.4990.99 0.46 22993 1 69 0 0 0 0 0 0 0 0 0 0 0 22993 1 70 0 0 0 0 0 0 0 0 0 0 0 22993 1 71 0 0 0 0 0 0 0 0 0 0 0 22993 1 72 0.14 0.14 0.14 0.14 0.14 0.10 0.10 0.10 0.10 0.16 0.16 22993 1 73 0.14 0.14 0.14 0.14 0.14 0.10 0.10 0.10 0.10 0.16 0.16 22993 1 74 0.14 0.14 0.14 0.14 0.14 0.10 0.10 0.10 0.10 0.16 0.16 22993 1 75 0.14 0.14 0.14 0.14 0.14 0.10 0.10 0.10 0.10 0.16 0.16 22993 1 76 continued 22993 1 77 0.41 0.42 0.47 0 0 0 0.14 0.14 0.14 0.14 22993 1 78 0.40 0.41 0.46 0 0 0 0.14 0.14 0.14 0.14 22993 1 79 0.40 0.41 0.47 0 0 0 0.14 0.14 0.14 0.14 22993 1 80 0.40 0.41 0.47 0 0 0 0.14 0.14 0.14 0.14 22993 1 81 0.41 0.42 0.47 0 0 0 0.14 0.14 0.14 0.14 22993 1 82 0.81 0.43 0.44 0 0 0 0.10 0.10 0.10 0.10 22993 1 83 0.83 0.44 0.45 0 0 0 0.10 0.10 0.10 0.10 22993 1 84 0.88 0.47 0.48 0 0 0 0.10 0.10 0.10 0.10 22993 1 85 0.47 0.92 0.99 0 0 0 0.10 0.10 0.10 0.10 22993 1 86 0.47 0.91 0.99 0 0 0 0.16 0.16 0.16 0.16 22993 1 87 0.85 0.45 0.46 0 0 0 0.16 0.16 0.16 0.16 22993 1 88 1. 0.45 0.46 0 0 0 0.16 0.16 0.16 0.16 22993 1 89 0.45 1. 0.89 0 0 0 0.16 0.16 0.16 0.16 22993 1 90 0.46 0.89 1. 0 0 0 0.16 0.16 0.16 0.16 22993 1 91 0 0 0 1. 0.85 0.89 0 0 0 0 22993 1 92 0 0 0 0.85 1. 0.88 0 0 0 0 22993 1 93 0 0 0 0.89 0.88 1. 0 0 0 0 22993 1 94 0.16 0.16 0.16 0 0 0 1. 0.53 0.80 0.81 22993 1 95 0.16 0.16 0.16 0 0 0 0.53 1. 0.59 0.58 22993 1 96 0.16 0.16 0.16 0 0 0 0.80 0.59 1. 0.87 22993 1 97 0.16 0.16 0.16 0 0 0 0.81 0.58 0.87 1. 22993 1 98 For Subents 003,004,005 - only mean per group values of22993 1 99 correlations are given in Table III of PR/C,85,044613. 22993 1 100 The results are obtained without solid-angle 22993 1 101 correlation. 22993 1 102 COMMENT Of compiler M.M. 22993 1 103 The correlation matrix given in Table III of 22993 1 104 J,PR/C,85,044613,2012 in two parts of this matrix - 22993 1 105 correlations between 22993 1 106 -Am243(n,f)/(n,p) Sets 1,2,3 and 22993 1 107 -Am243(n,f)/U238(n,f) En=4.39, 4.70, 5.50, 6.00 MeV 22993 1 108 is not symmetrical. 22993 1 109 This question was sent to authors 14.08.2012. 22993 1 110 The correct matrix was received 10.10.2012 from 22993 1 111 Gregoire Kessedjian . 22993 1 112 Detailed fine structure correlation matrix for 22993 1 113 experiments in reference to (n,p) was received 22993 1 114 18.10.2012 from Gregoire Kessedjian and is given in 22993 1 115 COVARIANCE lines . 22993 1 116 HISTORY (20071217C) SM 22993 1 117 (20080219U) Reference 2007NICE corrected 22993 1 118 (20101105A) SD: ref. corrected: 22993 1 119 C,2007NICE,,186(#473),.. => C,2007NICE,,483,.. 22993 1 120 R,EUR-22794-EN,81,2006 => S,EUR-22794,81,2007 22993 1 121 (20120810A) M.M. Reference J,PR/C,85,044613,2012 was 22993 1 122 added. BIB information was updated. 22993 1 123 Subents 003-007 were added. 22993 1 124 (20230518U) SD: Correction in Subent 002. 22993 1 125 ENDBIB 123 0 22993 1 126 NOCOMMON 0 0 22993 1 127 ENDSUBENT 126 0 22993 199999 SUBENT 22993002 20230518 231722993 2 1 BIB 8 18 22993 2 2 REACTION (95-AM-243(N,F),,SIG) 22993 2 3 FACILITY (VDG,2ZZZGEL) Van de Graaff driven neutron source 22993 2 4 (VDG,2FR BOR) 4 MV accelerator facility AIFIRA 22993 2 5 at CEN, Bordeaux 22993 2 6 INC-SOURCE (P-T) Neutrons from 1 to 4 MeV. 22993 2 7 TiT solid target. 22993 2 8 (D-D) Neutrons from 4 to 8 MeV 22993 2 9 Gaseous deuterium target. 22993 2 10 INC-SPECT Monoenergetic neutron beam. 22993 2 11 REL-REF (A,22032002,H.-H.Knitter+,J,NSE,99,1,1988) 22993 2 12 (D,41487005,A.B.Laptev+,J,NP/A,734,E25,2004) 22993 2 13 ERR-ANALYS (ERR-T) Total uncertainty. 22993 2 14 (ERR-S,,1.) Statistical uncertainty 22993 2 15 STATUS (TABLE) Delivered by INTERNET, G.Barreau 2007-12-07 22993 2 16 (SPSDD,22993003) Superseded by newer publication. 22993 2 17 (SPSDD,22993004) Superseded by newer publication. 22993 2 18 (SPSDD,22993005) Superseded by newer publication. 22993 2 19 HISTORY (20230518U) SD: Values from COMMON moved to free text. 22993 2 20 ENDBIB 18 0 22993 2 21 NOCOMMON 0 0 22993 2 22 DATA 4 13 22993 2 23 EN EN-RSL DATA ERR-T 22993 2 24 MEV MEV B B 22993 2 25 1.841 0.100 1.512 0.039 22993 2 26 2.361 0.090 1.581 0.042 22993 2 27 2.876 0.085 1.605 0.042 22993 2 28 3.387 0.076 1.546 0.039 22993 2 29 3.592 0.198 1.585 0.073 22993 2 30 4.070 0.117 1.600 0.071 22993 2 31 4.768 0.074 1.537 0.065 22993 2 32 5.122 0.074 1.499 0.038 22993 2 33 5.721 0.059 1.554 0.039 22993 2 34 5.997 0.050 1.636 0.071 22993 2 35 6.213 0.042 1.823 0.080 22993 2 36 6.824 0.045 2.185 0.079 22993 2 37 7.350 0.042 2.324 0.061 22993 2 38 ENDDATA 15 0 22993 2 39 ENDSUBENT 38 0 22993 299999 SUBENT 22993003 20120810 22332299300300001 BIB 14 82 2299300300002 REACTION (95-AM-243(N,F),,SIG) 2299300300003 FACILITY (VDG,2ZZZGEL) Van de Graaff driven neutron source 2299300300004 INC-SOURCE (P-T) Neutrons from 1 to 4 MeV. 2299300300005 TiT solid target. 2299300300006 INC-SPECT Monoenergetic neutron beam. 2299300300007 PART-DET (FF,P) 2299300300008 DETECTOR (SOLST) Two sets of photovoltaic cells in a compact 2299300300009 geometry placed at 5 mm on both sides of the Am-243 2299300300010 targets. Each photovoltaic cell of rectangular shape 2299300300011 20x40 mm consists of a monocristalline silicon 2299300300012 structure covered with a comb-like conducting grid 2299300300013 -for fission fragments detection. 2299300300014 The photovoltaic cells have no sensitivity to neutron 2299300300015 beam and an intrinsic efficiency of 95(+-1)%. Fission 2299300300016 detectors were placed in front of each Am target in a 2299300300017 very compact geometry to obtain geometrical efficiency 2299300300018 of about 70%. 2299300300019 (TELES,SCIN) A polypropylene (PP) foil ((C3H6)n) placed2299300300020 at 45 mm from the 243Am targets and 80 mm from neutron 2299300300021 source. This foil placed at 0 degree with respect to 2299300300022 the incident-neutron beam served as a radiator to 2299300300023 convert quasi-monoenergetic neutrons into protons. 2299300300024 Recoiling protons emitted from the neutron-proton 2299300300025 elastic scattering reaction occurring in the PP foil, 2299300300026 were detected at 74.4 +- 0.2 mm downstream, by silicon 2299300300027 telescope consisting of an energy-loss detector of 2299300300028 55 microm positioned in front of a residual-energy 2299300300029 detector of 700 microm. Several thicknesses (10 to 2299300300030 50 microm) of the PP foil were used to keep the energy 2299300300031 loss of the recoiling protons below 15% for all 2299300300032 incident neutron energies. 2299300300033 The ensemble PP-telescope formed neutron flux detector.2299300300034 METHOD (EDE) Protons recoiling from neutron scattering in 2299300300035 the PP foil were detected by means of DE-E telescope 2299300300036 located at 75 mm from the foil. 2299300300037 (STTA) Stack target irradiation 2299300300038 MONITOR (1-H-1(N,EL)1-H-1,,DA) At zero degree as flux monitor 2299300300039 MONIT-REF (,J.C.Hopkins+,J,ND/A,9,137,1971) 2299300300040 SAMPLE Back-to-back deposits of two 243Am targets placed at 2299300300041 39 mm from the neutron source and at 0 degree with 2299300300042 respect to the incident neutron beam. 2299300300043 Targets were prepared at the Lawrence Berkeley National2299300300044 Laboratory by electroplating onto a 0.6-mm-thick 2299300300045 stainless steel backing with a deposit diameter of 6mm;2299300300046 the sample thicknesses were 546(+-2) microg/cm2 and 2299300300047 564 (+-2) microg/cm2. 2299300300048 (95-AM-243,ENR=0.9996) The isotopic purity of the Am 2299300300049 targets was 99.96 (+-0.01)%. 2299300300050 The target characteristics were measured by alpha 2299300300051 spectrometry - revealed the presence of a very small 2299300300052 quantity of 249Cf. 2299300300053 CORRECTION For backgrounds. 2299300300054 ANALYSIS In principle, the neutron flux on the PP foil is 2299300300055 obtained by integrating the spectrum of recoil protons 2299300300056 combined with the n-p elastic cross section and the 2299300300057 telescope efficiency using Monte Carlo simulations of 2299300300058 neutrons and protons passing through the experimental 2299300300059 setup, which takes into account the resolution of the 2299300300060 charged particle beam, the energy loss of the charged 2299300300061 particle beam in the deuterium or tritium targets, the 2299300300062 angular distributions of the neutron beam,the angular 2299300300063 distribution of the (n,p) elastic scattering cross 2299300300064 sections, the proton energy loss in the PP foil, the 2299300300065 energy resolution of the Si telescope. Then the neutron2299300300066 spectrum, the mean value of (n,p) elastic scattering 2299300300067 cross section, the proton detector efficiency as 2299300300068 function of neutron energy were deduced. (n,p) elastic 2299300300069 scattering anisotropy was taken into account in the 2299300300070 calculations of the proton detection efficiencies. 2299300300071 Kinematic effects and the uncertainties on geometrical 2299300300072 parameters were taken into account to define precisely 2299300300073 the value and the uncertainty of fission efficiency. 2299300300074 ERR-ANALYS (MONIT-ERR,,0.5) Precision better than 0.5% over a 2299300300075 wide range of neutron energies (1 meV to 20 MeV). 2299300300076 (ERR-T) Total standard deviation, 2299300300077 without solid-angle correlation - LAMBDA1=LAMBDA2=0. 2299300300078 (ERR-S) Statistical standard deviation. 2299300300079 (DATA-ERR) Minimal standard deviation for maximal 2299300300080 solid-angle correlations LAMBDA1=1, LAMBDA2=0.61 2299300300081 of one/two Am-243 samples used. 2299300300082 (EN-ERR) Standard deviation on EN. 2299300300083 STATUS (TABLE) Tables I,2 of J,PR/C,85,044613,2012 2299300300084 ENDBIB 82 0 2299300300085 NOCOMMON 0 0 2299300300086 DATA 6 5 2299300300087 EN EN-ERR DATA ERR-S ERR-T DATA-ERR 2299300300088 MEV MEV B PER-CENT PER-CENT PER-CENT 2299300300089 1.84 0.10 1.51 1.1 3.4 2.2 2299300300090 2.36 0.09 1.58 1.3 3.4 2.6 2299300300091 2.88 0.09 1.60 1.0 3.3 2.1 2299300300092 2.88 0.09 1.62 0.6 3.3 2.2 2299300300093 3.39 0.08 1.55 0.7 3.3 2.2 2299300300094 ENDDATA 7 0 2299300300095 ENDSUBENT 94 0 2299300399999 SUBENT 22993004 20120810 22332299300400001 BIB 14 82 2299300400002 REACTION (95-AM-243(N,F),,SIG) 2299300400003 FACILITY (VDG,2ZZZGEL) Van de Graaff driven neutron source 2299300400004 INC-SOURCE (D-D) Neutrons from 4 to 8 MeV 2299300400005 Gaseous deuterium target. 2299300400006 INC-SPECT Monoenergetic neutron beam. 2299300400007 PART-DET (FF,P) 2299300400008 DETECTOR (SOLST) Two sets of photovoltaic cells in a compact 2299300400009 geometry placed at 5 mm on both sides of the Am-243 2299300400010 targets. Each photovoltaic cell of rectangular shape 2299300400011 20x40 mm consists of a monocristalline silicon 2299300400012 structure covered with a comb-like conducting grid 2299300400013 -for fission fragments detection. 2299300400014 The photovoltaic cells have no sensitivity to neutron 2299300400015 beam and an intrinsic efficiency of 95(+-1)%. Fission 2299300400016 detectors were placed in front of each Am target in a 2299300400017 very compact geometry to obtain geometrical efficiency 2299300400018 of about 70%. 2299300400019 (TELES,SCIN) A polypropylene (PP) foil ((C3H6)n) placed2299300400020 at 45 mm from the 243Am targets and 80 mm from neutron 2299300400021 source. This foil placed at 0 degree with respect to 2299300400022 the incident-neutron beam served as a radiator to 2299300400023 convert quasi-monoenergetic neutrons into protons. 2299300400024 Recoiling protons emitted from the neutron-proton 2299300400025 elastic scattering reaction occurring in the PP foil, 2299300400026 were detected at 74.4 +- 0.2 mm downstream, by silicon 2299300400027 telescope consisting of an energy-loss detector of 2299300400028 55 microm positioned in front of a residual-energy 2299300400029 detector of 700 microm. Several thicknesses (10 to 2299300400030 50 microm) of the PP foil were used to keep the energy 2299300400031 loss of the recoiling protons below 15% for all 2299300400032 incident neutron energies. 2299300400033 The ensemble PP-telescope formed neutron flux detector.2299300400034 METHOD (EDE) Protons recoiling from neutron scattering in 2299300400035 the PP foil were detected by means of DE-E telescope 2299300400036 located at 75 mm from the foil. 2299300400037 (STTA) Stack target irradiation 2299300400038 MONITOR (1-H-1(N,EL)1-H-1,,DA) At zero degree as flux monitor 2299300400039 MONIT-REF (,J.C.Hopkins+,J,ND/A,9,137,1971) 2299300400040 SAMPLE Back-to-back deposits of two 243Am targets placed at 2299300400041 at 39 mm from the neutron source and at 0 degree with 2299300400042 respect to the incident neutron beam. 2299300400043 Targets were prepared at the Lawrence Berkeley National2299300400044 Laboratory by electroplating onto a 0.6-mm-thick 2299300400045 stainless steel backing with a deposit diameter of 6mm;2299300400046 the sample thicknesses were 546(+-2) microg/cm2 and 2299300400047 564 (+-2) microg/cm2. 2299300400048 (95-AM-243,ENR=0.9996) The isotopic purity of the Am 2299300400049 targets was 99.96 (+-0.01)%. 2299300400050 The target characteristics were measured by alpha 2299300400051 spectrometry - revealed the presence of a very small 2299300400052 quantity of 249Cf. 2299300400053 CORRECTION For backgrounds. 2299300400054 ANALYSIS In principle, the neutron flux on the PP foil is 2299300400055 obtained by integrating the spectrum of recoil protons 2299300400056 combined with the n-p elastic cross section and the 2299300400057 telescope efficiency using Monte Carlo simulations of 2299300400058 neutrons and protons passing through the experimental 2299300400059 setup, which takes into account the resolution of the 2299300400060 charged particle beam, the energy loss of the charged 2299300400061 particle beam in the deuterium or tritium targets, the 2299300400062 angular distributions of the neutron beam,the angular 2299300400063 distribution of the (n,p) elastic scattering cross 2299300400064 sections, the proton energy loss in the PP foil, the 2299300400065 energy resolution of the Si telescope. Then the neutron2299300400066 spectrum, the mean value of (n,p) elastic scattering 2299300400067 cross section, the proton detector efficiency as 2299300400068 function of neutron energy were deduced. (n,p) elastic 2299300400069 scattering anisotropy was taken into account in the 2299300400070 calculations of the proton detection efficiencies. 2299300400071 Kinematic effects and the uncertainties on geometrical 2299300400072 parameters were taken into account to define precisely 2299300400073 the value and the uncertainty of fission efficiency. 2299300400074 ERR-ANALYS (MONIT-ERR,,0.5) Precision better than 0.5% over a 2299300400075 wide range of neutron energies (1 meV to 20 MeV). 2299300400076 (ERR-T) Total standard deviation, 2299300400077 without solid-angle correlation - LAMBDA1=LAMBDA2=0. 2299300400078 (ERR-S) Statistical standard deviation. 2299300400079 (DATA-ERR) Minimal standard deviation for maximal 2299300400080 solid-angle correlations LAMBDA1=1, LAMBDA2=0.61 2299300400081 of one/two Am-243 samples used. 2299300400082 (EN-ERR) Standard deviation on EN. 2299300400083 STATUS (TABLE) Tables I,2 of J,PR/C,85,044613,2012 2299300400084 ENDBIB 82 0 2299300400085 NOCOMMON 0 0 2299300400086 DATA 6 4 2299300400087 EN EN-ERR DATA ERR-S ERR-T DATA-ERR 2299300400088 MEV MEV B PER-CENT PER-CENT PER-CENT 2299300400089 5.12 0.07 1.50 0.6 2.9 2.1 2299300400090 5.72 0.06 1.55 0.7 2.9 2.1 2299300400091 6.82 0.05 2.19 1.3 3.7 3.0 2299300400092 7.35 0.04 2.29 1.1 2.9 2.2 2299300400093 ENDDATA 6 0 2299300400094 ENDSUBENT 93 0 2299300499999 SUBENT 22993005 20120810 22332299300500001 BIB 14 83 2299300500002 REACTION (95-AM-243(N,F),,SIG) 2299300500003 FACILITY (ACCEL,2FR BOR) 4 MV accelerator facility AIFIRA 2299300500004 at CEN, Bordeaux 2299300500005 INC-SOURCE (D-D) Neutrons from 4 to 8 MeV 2299300500006 Gaseous deuterium target. 2299300500007 INC-SPECT Monoenergetic neutron beam. 2299300500008 PART-DET (FF,P) 2299300500009 DETECTOR (SOLST) Two sets of photovoltaic cells in a compact 2299300500010 geometry placed at 5 mm on both sides of the Am-243 2299300500011 targets. Each photovoltaic cell of rectangular shape 2299300500012 20x40 mm consists of a monocristalline silicon 2299300500013 structure covered with a comb-like conducting grid 2299300500014 -for fission fragments detection. 2299300500015 The photovoltaic cells have no sensitivity to neutron 2299300500016 beam and an intrinsic efficiency of 95(+-1)%. Fission 2299300500017 detectors were placed in front of each Am target in a 2299300500018 very compact geometry to obtain geometrical efficiency 2299300500019 of about 70%. 2299300500020 (TELES,SCIN) A polypropylene (PP) foil ((C3H6)n) placed2299300500021 at 45 mm from the 243Am targets and 80 mm from neutron 2299300500022 source. This foil placed at 0 degree with respect to 2299300500023 the incident-neutron beam served as a radiator to 2299300500024 convert quasi-monoenergetic neutrons into protons. 2299300500025 Recoiling protons emitted from the neutron-proton 2299300500026 elastic scattering reaction occurring in the PP foil, 2299300500027 were detected at 74.4 +- 0.2 mm downstream, by silicon 2299300500028 telescope consisting of an energy-loss detector of 2299300500029 55 microm positioned in front of a residual-energy 2299300500030 detector of 700 microm. Several thicknesses (10 to 2299300500031 50 microm) of the PP foil were used to keep the energy 2299300500032 loss of the recoiling protons below 15% for all 2299300500033 incident neutron energies. 2299300500034 The ensemble PP-telescope formed neutron flux detector.2299300500035 METHOD (EDE) Protons recoiling from neutron scattering in 2299300500036 the PP foil were detected by means of DE-E telescope 2299300500037 located at 75 mm from the foil. 2299300500038 (STTA) Stack target irradiation 2299300500039 MONITOR (1-H-1(N,EL)1-H-1,,DA) At zero degree as flux monitor 2299300500040 MONIT-REF (,J.C.Hopkins+,J,ND/A,9,137,1971) 2299300500041 SAMPLE Back-to-back deposits of two 243Am targets placed at 2299300500042 at 39 mm from the neutron source and at 0 degree with 2299300500043 respect to the incident neutron beam. 2299300500044 Targets were prepared at the Lawrence Berkeley National2299300500045 Laboratory by electroplating onto a 0.6-mm-thick 2299300500046 stainless steel backing with a deposit diameter of 6mm;2299300500047 the sample thicknesses were 546(+-2) microg/cm2 and 2299300500048 564 (+-2) microg/cm2. 2299300500049 (95-AM-243,ENR=0.9996) The isotopic purity of the Am 2299300500050 targets was 99.96 (+-0.01)%. 2299300500051 The target characteristics were measured by alpha 2299300500052 spectrometry - revealed the presence of a very small 2299300500053 quantity of 249Cf. 2299300500054 CORRECTION For backgrounds. 2299300500055 ANALYSIS In principle, the neutron flux on the PP foil is 2299300500056 obtained by integrating the spectrum of recoil protons 2299300500057 combined with the n-p elastic cross section and the 2299300500058 telescope efficiency using Monte Carlo simulations of 2299300500059 neutrons and protons passing through the experimental 2299300500060 setup, which takes into account the resolution of the 2299300500061 charged particle beam, the energy loss of the charged 2299300500062 particle beam in the deuterium or tritium targets, the 2299300500063 angular distributions of the neutron beam,the angular 2299300500064 distribution of the (n,p) elastic scattering cross 2299300500065 sections, the proton energy loss in the PP foil, the 2299300500066 energy resolution of the Si telescope. Then the neutron2299300500067 spectrum, the mean value of (n,p) elastic scattering 2299300500068 cross section, the proton detector efficiency as 2299300500069 function of neutron energy were deduced. (n,p) elastic 2299300500070 scattering anisotropy was taken into account in the 2299300500071 calculations of the proton detection efficiencies. 2299300500072 Kinematic effects and the uncertainties on geometrical 2299300500073 parameters were taken into account to define precisely 2299300500074 the value and the uncertainty of fission efficiency. 2299300500075 ERR-ANALYS (MONIT-ERR,,0.5) Precision better than 0.5% over a 2299300500076 wide range of neutron energies (1 meV to 20 MeV). 2299300500077 (ERR-T) Total standard deviation, 2299300500078 without solid-angle correlation - LAMBDA1=LAMBDA2=0. 2299300500079 (ERR-S) Statistical standard deviation. 2299300500080 (DATA-ERR) Minimal standard deviation for maximal 2299300500081 solid-angle correlations LAMBDA1=1, LAMBDA2=0.61 2299300500082 of one/two Am-243 samples used. 2299300500083 (EN-ERR) Standard deviation on EN. 2299300500084 STATUS (TABLE) Tables I,2 of J,PR/C,85,044613,2012 2299300500085 ENDBIB 83 0 2299300500086 NOCOMMON 0 0 2299300500087 DATA 6 5 2299300500088 EN EN-ERR DATA ERR-S ERR-T DATA-ERR 2299300500089 MEV MEV B PER-CENT PER-CENT PER-CENT 2299300500090 3.59 0.20 1.59 2.4 4.6 3.7 2299300500091 4.07 0.12 1.60 2.1 4.5 3.6 2299300500092 4.77 0.07 1.54 1.5 4.2 3.3 2299300500093 6.00 0.05 1.64 1.8 4.4 3.5 2299300500094 6.21 0.04 1.82 1.9 4.4 3.5 2299300500095 ENDDATA 7 0 2299300500096 ENDSUBENT 95 0 2299300599999 SUBENT 22993006 20120810 22332299300600001 BIB 9 22 2299300600002 REACTION (95-AM-243(N,F),,SIG) 2299300600003 FACILITY (ACCEL,2FR BOR) 3.54 MV facility AIFIRA at CENBG, 2299300600004 Bordeaux,France. 2299300600005 INC-SOURCE (D-D) Neutrons from 4 to 8 MeV 2299300600006 Gaseous deuterium target. 2299300600007 DETECTOR (PHVC) Fission detectors consisted of two sets of 2299300600008 photovoltaic cells in a very compact geometry . 2299300600009 SAMPLE Back-to-back targets consisting of 243Am of 2299300600010 546 microg/cm2 (+-0.5%) thickness and 238U of 2299300600011 462 microg/cm2 (+-1.5%) thickness, were placed at a 2299300600012 distance of 40 mm from the neutron source and 2299300600013 perpendicularly to the incident-neutron beam. 2299300600014 PART-DET (FF) 2299300600015 MONITOR (92-U-238(N,F),,SIG) As flux monitor. 2299300600016 ERR-ANALYS (ERR-T) Total standard deviation, 2299300600017 without solid-angle correlation - LAMBDA1=LAMBDA2=0. 2299300600018 (ERR-S) Statistical standard deviation. 2299300600019 (DATA-ERR) Minimal standard deviation for maximal 2299300600020 solid-angle correlations LAMBDA1=1, LAMBDA2=0.61 2299300600021 of one/two Am-243 samples used. 2299300600022 (EN-ERR) Standard deviation on EN. 2299300600023 STATUS (TABLE) Tables I,2 of J,PR/C,85,044613,2012 2299300600024 ENDBIB 22 0 2299300600025 NOCOMMON 0 0 2299300600026 DATA 6 3 2299300600027 EN EN-ERR DATA ERR-S ERR-T DATA-ERR 2299300600028 MEV MEV B PER-CENT PER-CENT PER-CENT 2299300600029 4.00 0.05 1.48 2.3 6.2 5.4 2299300600030 4.59 0.05 1.55 2.5 6.3 5.5 2299300600031 5.31 0.05 1.38 1.7 6.0 5.2 2299300600032 ENDDATA 5 0 2299300600033 ENDSUBENT 32 0 2299300699999 SUBENT 22993007 20120810 22332299300700001 BIB 9 18 2299300700002 REACTION (95-AM-243(N,F),,SIG) 2299300700003 FACILITY (VDG,2FR BOR) 4MV Van de Graaff facility at CENBG. 2299300700004 INC-SOURCE (D-D) Neutrons from 4 to 8 MeV 2299300700005 Gaseous deuterium target. 2299300700006 DETECTOR (PHVC) Fission detectors consisted of two sets of 2299300700007 photovoltaic cells in a very compact geometry . 2299300700008 SAMPLE Two targets of 243Am - 106 microg/cm2 (+-0.5%) and 2299300700009 235U - 409 microg/cm2 (+-1%). 2299300700010 PART-DET (FF) 2299300700011 MONITOR (92-U-235(N,F),,SIG) As flux monitor. 2299300700012 ERR-ANALYS (ERR-T) Total standard deviation, 2299300700013 without solid-angle correlation - LAMBDA1=LAMBDA2=0. 2299300700014 (ERR-S) Statistical standard deviation. 2299300700015 (DATA-ERR) Minimal standard deviation for maximal 2299300700016 solid-angle correlations LAMBDA1=1, LAMBDA2=0.61 2299300700017 of one/two Am-243 samples used. 2299300700018 (EN-ERR) Standard deviation on EN. 2299300700019 STATUS (TABLE) Tables I,2 of J,PR/C,85,044613,2012 2299300700020 ENDBIB 18 0 2299300700021 NOCOMMON 0 0 2299300700022 DATA 6 4 2299300700023 EN EN-ERR DATA ERR-S ERR-T DATA-ERR 2299300700024 MEV MEV B PER-CENT PER-CENT PER-CENT 2299300700025 4.39 0.05 1.53 2.6 4.8 4.4 2299300700026 4.70 0.05 1.54 2.2 4.6 4.2 2299300700027 5.50 0.05 1.40 1.4 4.3 3.8 2299300700028 6.00 0.05 1.72 1.7 4.4 3.9 2299300700029 ENDDATA 6 0 2299300700030 ENDSUBENT 29 0 2299300799999 ENDENTRY 7 0 2299399999999