ENTRY 23148 20200117 22852314800000001 SUBENT 23148001 20200117 22852314800100001 BIB 11 70 2314800100002 TITLE Neutron-induced fission cross-section of U-233,Am-241 2314800100003 and Am-243 in the energy range 0.5 < En < 20 MeV. 2314800100004 AUTHOR (F.Belloni,P.M.Milazzo,M.Calviani, N.Colonna,P.Mastinu,2314800100005 U.Abbondanno, G.Aerts, H.Alvarez,F.Alvarez-Velarde, 2314800100006 S.Andriamonje, J.Andrzejewski,L.Audouin, G.Badurek, 2314800100007 P.Baumann,F.Becvar,E.Berthoumieux,F.Calvino,D.Cano-Ott,2314800100008 R.Capote, C.Carrapico, P.Cennini, V.Chepel, E.Chiaveri,2314800100009 G.Cortes,A.Couture,J.Cox,M.Dahlfors,S.David,I.Dillmann,2314800100010 C.Domingo-Pardo, W.Dridi, I.Duran, C.Eleftheriadis, 2314800100011 M.Embid-Segura, L.Ferrant,A.Ferrari,R.Ferreira-Marques,2314800100012 K.Fujii, W.Furman, I.Goncalves, E.Gonzalez-Romero, 2314800100013 A.Goverdovski, F.Gramegna,C.Guerrero, F.Gunsing,B.Haas,2314800100014 R.Haight, M.Heil, A.Herrera-Martinez, M.Igashira, 2314800100015 E.Jericha,F.Kaeppeler, Y.Kadi,D.Karadimos, D.Karamanis,2314800100016 M.Kerveno, P.Koehler, E.Kossionides, M.Krticka, 2314800100017 C.Lamboudis,H.Leeb,A.Lindote,I.Lopes, M.Lozano,S.Lukic,2314800100018 J.Marganiec, S.Marrone,T.Martinez,C.Massimi, A.Mengoni,2314800100019 C.Moreau, M.Mosconi, F.Neves, H.Oberhummer, S.O'Brien, 2314800100020 J.Pancin,C.Papachristodoulou,C.Papadopoulos,C.Paradela,2314800100021 N.Patronis,A.Pavlik, P.Pavlopoulos, L.Perrot,M.T.Pigni,2314800100022 R.Plag, A.Plompen, A.Plukis, A.Poch,J.Praena, C.Pretel,2314800100023 J.Quesada, T.Rauscher, R.Reifarth, M.Rosetti, C.Rubbia,2314800100024 G.Rudolf, P.Rullhusen,J.Salgado,C.Santos,L.Sarchiapone,2314800100025 I.Savvidis,C.Stephan,G.Tagliente,J.L.Tain,L.Tassan-Got,2314800100026 L.Tavora, R.Terlizzi, G.Vannini, P.Vaz, A.Ventura, 2314800100027 D.Villamarin, M.C.Vincente, V.Vlachoudis, R.Vlastou, 2314800100028 F.Voss, S.Walter, M.Wiescher, K.Wisshak,M.Barbagallo, 2314800100029 M.H.Meaze, D.Tarrio) 2314800100030 INSTITUTE (2ZZZCER,2ITYTRI,2ITYPAD,2ITYBAU,2FR SAC,2SPNSAU, 2314800100031 3POLLOU,2GERKFK,2AUSATI,2FR STR,3CZRCHU,3ZZZIAE, 2314800100032 2SPNSEU,1USANOT,2SPNVAL,2GRCARU,4ZZZDUB,4RUSFEI, 2314800100033 2FR GRA,1USALAS,2SPNUPC) 2314800100034 (2SPNPCM) Centro de Investigaciones Energeticas 2314800100035 Medioambientales y Technologicas, Madrid,Spain 2314800100036 (2PRTLFE) Instituto Tecnologico e Nuclear (ITN),Lisbon;2314800100037 (2PRTCMB) LIP - Coimbra and Departamento de Fisica da 2314800100038 Universidade de Coimbra . 2314800100039 (2ZZZCER) The n TOF Collaboration. 2314800100040 REFERENCE (C,2010KRAKOW,,113,2010) 2314800100041 U-233, Am-241,-143 preliminary data on figures. 2314800100042 (J,EPJ/A,47,160,2011) 2314800100043 #doi:10.1140/epja/i2011-11160-x 2314800100044 Main reference for Am-243 data. 2314800100045 (J,EPJ/A,49,2,2013) 2314800100046 #doi:10.1140/epja/i2013-13002-3 2314800100047 Main reference for Am-241 2314800100048 (S,AIP-1175,211,2009) 243Am data in fig. 2314800100049 (S,AIP-1265,477,2010) 243Am data in fig. 2314800100050 REL-REF (O,23128001,F.Belloni+,J,EPJ/A,47,2,2011) - U-233 data 2314800100051 FACILITY (SYNCH,2ZZZCER) 2314800100052 INC-SOURCE (SPALL) 20 GeV pulsed proton beam with 6 ns r.m.s., 2314800100053 repetition rate 2.4 sec hit thick lead target of 2314800100054 80x80x60 cm**3 size. 2314800100055 Two collimators at 137 and 176 m. The various 2314800100056 backgrounds components are suppressed by a 1.5 T 2314800100057 sweeping magnet, heavy concrete walls, 3.5m thick iron 2314800100058 shielding located along the beam line. 2314800100059 INC-SPECT Instantaneous neutron flux of 10**5 n/cm**2/pulse at 2314800100060 sample position. 2314800100061 METHOD (TOF) 185 m long evacuated beam pipe. 2314800100062 DETECTOR (IOCH) Fast ionization chamber (16 sections) operated 2314800100063 with gas mixture of 90% Ar and 10% CF4 at a pressure of2314800100064 720 mbar. 2314800100065 HISTORY (20120301C) M.M. 2314800100066 Request for the data was sent. 2314800100067 (20130510A) M.M. Reference J,EPJ/A,49,2,2013 was added.2314800100068 Subent 004 was corrected. 2314800100069 (20151013U) SD: two refs AIP-1175, AIP-1265 were added.2314800100070 STATUS 'COREL' deleted, information moved to REL-REF. 2314800100071 (20200117U) SD: SAMPLE corrected in Subent 004. 2314800100072 ENDBIB 70 0 2314800100073 NOCOMMON 0 0 2314800100074 ENDSUBENT 73 0 2314800199999 SUBENT 23148002 20120228 22302314800200001 BIB 6 43 2314800200002 REACTION ((95-AM-243(N,F),,SIG,,AV)/(92-U-235(N,F),,SIG,,AV)) 2314800200003 SAMPLE Prepared by the painting technique. The eight 243Am 2314800200004 samples with 97.0% enrichment in 243Am and an 241Am 2314800200005 admixture of 2.6%. The alpha activity of Am samples was2314800200006 of 7.390 MBq. Chemical form AmO2. 2314800200007 Two 235U reference samples - almost isotopically pure, 2314800200008 99.992% of 235U. Chemical form U3O8 . 2314800200009 Sample Mass Thickness Uncertainty 2314800200010 mg microg/cm**2 % 2314800200011 Am-243 0.556 11.1 1.2 2314800200012 0.585 11.6 1.2 2314800200013 0.613 12.2 1.3 2314800200014 0.631 12.5 1.3 2314800200015 0.537 10.7 1.2 2314800200016 0.558 11.1 1.2 2314800200017 0.595 11.8 1.3 2314800200018 0.710 14.1 1.2 2314800200019 U-235 15.2 303 1.4 2314800200020 16.6 330 1.3 2314800200021 ANALYSIS The length of the flight path was obtained by means of 2314800200022 the analysis of the well-known 235U resonances. 2314800200023 CORRECTION For absorption losses in the samples and for the 2314800200024 threshold effect imposed by the alpha activity by 2314800200025 Monte Carlo simulations of the detector response 2314800200026 with the FLUKA code. 2314800200027 The efficiencies were found to be 99.7% and 95.1% for 2314800200028 243Am and for the thicker 235U sample, respectively, 2314800200029 and the resulting efficiency correction is 4.6%. 2314800200030 Average dead-time corrections are 5%, with a maximum of2314800200031 10% at 2 MeV neutron energy. 2314800200032 ERR-ANALYS Statistical uncertainty (about 3%) is energy dependent 2314800200033 (ERR-1) Uncertainty due to determination of the sample 2314800200034 masses by alpha spectroscopy - 1.9% with almost equal 2314800200035 contributions of 1.3% and 1.35% from 243Am and 235U. 2314800200036 (ERR-2) Uncertainty due to corrections for detection 2314800200037 efficiencies (of the order of 1.0%). 2314800200038 (ERR-3) Uncertainty due to corrections for dead time 2314800200039 effects (of the order of 1.0%). 2314800200040 Uncertainty in neutron energy is determined by the 2314800200041 time resolution of the initial proton beam and 2314800200042 increases from about 0.1% at 0.5MeV to 0.6% at 20MeV. 2314800200043 STATUS (TABLE) Table 2 of J,EPJ/A,47,160,2011 . 2314800200044 Data are on Fig.2 of C,2010KRAKOW,,113,2010 . 2314800200045 ENDBIB 43 0 2314800200046 COMMON 3 3 2314800200047 ERR-1 ERR-2 ERR-3 2314800200048 PER-CENT PER-CENT PER-CENT 2314800200049 1.9 1. 1. 2314800200050 ENDCOMMON 3 0 2314800200051 DATA 4 32 2314800200052 EN-MIN EN-MAX DATA ERR-T 2314800200053 MEV MEV NO-DIM NO-DIM 2314800200054 0.501 0.562 0.0789 0.006 2314800200055 0.562 0.631 0.0981 0.007 2314800200056 0.631 0.708 0.160 0.009 2314800200057 0.708 0.794 0.246 0.01 2314800200058 0.794 0.891 0.428 0.02 2314800200059 0.891 1.000 0.748 0.03 2314800200060 1.00 1.12 1.05 0.04 2314800200061 1.12 1.26 1.15 0.04 2314800200062 1.26 1.41 1.18 0.04 2314800200063 1.41 1.58 1.24 0.04 2314800200064 1.58 1.78 1.17 0.04 2314800200065 1.78 2.00 1.14 0.04 2314800200066 2.00 2.24 1.14 0.04 2314800200067 2.24 2.51 1.16 0.04 2314800200068 2.51 2.82 1.18 0.04 2314800200069 2.82 3.16 1.24 0.04 2314800200070 3.16 3.55 1.30 0.05 2314800200071 3.55 3.98 1.30 0.05 2314800200072 3.98 4.47 1.30 0.05 2314800200073 4.47 5.01 1.37 0.06 2314800200074 5.01 5.62 1.43 0.06 2314800200075 5.62 6.31 1.54 0.05 2314800200076 6.31 7.08 1.44 0.06 2314800200077 7.08 7.94 1.36 0.06 2314800200078 7.94 8.91 1.23 0.05 2314800200079 8.91 10.00 1.19 0.05 2314800200080 10.00 11.22 1.26 0.05 2314800200081 11.22 12.59 1.27 0.06 2314800200082 12.59 14.13 1.26 0.06 2314800200083 14.13 15.85 1.18 0.05 2314800200084 15.85 17.78 1.05 0.05 2314800200085 17.78 19.95 1.20 0.05 2314800200086 ENDDATA 34 0 2314800200087 ENDSUBENT 86 0 2314800299999 SUBENT 23148003 20120228 22302314800300001 BIB 7 46 2314800300002 REACTION (95-AM-243(N,F),,SIG,,AV) 2314800300003 Average c-s in energy bin. 2314800300004 MONITOR (92-U-235(N,F),,SIG) 2314800300005 MONIT-REF (,,3,ENDF/B-VII.0,,2006) 2314800300006 (,A.D.Carlson+,J,NDS,110,(12),3215,2009) 2314800300007 U-235 is well-established as standard. 2314800300008 ERR-ANALYS Statistical uncertainty (about 3%) is energy dependent 2314800300009 (ERR-1) Uncertainty due to determination of the sample 2314800300010 masses by alpha spectroscopy - 1.9% with almost equal 2314800300011 contributions of 1.3% and 1.35% from 243Am and 235U. 2314800300012 (MONIT-ERR) Uncertainty of the 235U reference cross 2314800300013 section typically 2%. 2314800300014 (ERR-2) Uncertainty due to corrections for detection 2314800300015 efficiencies . 2314800300016 (ERR-3) Uncertainty due to corrections for dead time 2314800300017 effects . 2314800300018 Uncertainty in neutron energy is determined by the 2314800300019 time resolution of the initial proton beam and 2314800300020 increases from about 0.1% at 0.5MeV to 0.6% at 20MeV. 2314800300021 (ERR-SYS) Resulting systematic uncertainty in c-s. 2314800300022 (ERR-T) Total uncertainty of typically 4%. 2314800300023 ADD-RES (COMP)Differences between the present and previous 2314800300024 energy integrated cross-sections in energy range of 2314800300025 overlap: 2314800300026 Authors Energy range,MeV Difference,% 2314800300027 Aiche+ 1.8-7.4 -3.9 2314800300028 Fomichev+ 0.59-20. +5.2 2314800300029 Goverdovskiy+ 5.0-10.4 -11.9 2314800300030 Behrens+ 0.5-20. -6.5 2314800300031 Seeger+ 0.5-3. -6.3 2314800300032 ENDF/B-VII.0 1.-20. +0.9 2314800300033 JENDL-4.0 1.-20. +6.0 2314800300034 JEFF-3.1.1 1.-20. +4.8 2314800300035 ROSFOND 1.-20. +4.3 2314800300036 BROND-2.2 1.-20. +3.6 2314800300037 Empire 1.-20. -1.5 2314800300038 REL-REF (R,22993001,M.Aiche+,C,2007NICE,1,483,2007) 2314800300039 (R,41487001,A.B.Laptev+,C,2007SANIB,1,462,2007) 2314800300040 (R,41444001,A.V.Fomichev+,R,RI-262,2004) 2314800300041 (R,41058001,A.A.Goverdovskiy+,J,AE,67,30,1989) 2314800300042 (R,10652001,J.W.Behrens+,J,NSE,77,444,1981) 2314800300043 (R,10063001,P.A.Seeger+,R,LA-4420,138,1970) 2314800300044 References of data used for comparison. 2314800300045 STATUS (TABLE) Table 2 of J,EPJ/A,47,160,2011 . 2314800300046 Data are on Fig.2 of C,2010KRAKOW,,113,2010 . 2314800300047 (DEP,23148002) Measured c-s ratio Am-243/U-235. 2314800300048 ENDBIB 46 0 2314800300049 COMMON 5 3 2314800300050 ERR-1 MONIT-ERR ERR-2 ERR-3 ERR-SYS 2314800300051 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2314800300052 1.9 2. 1. 1. 3. 2314800300053 ENDCOMMON 3 0 2314800300054 DATA 4 32 2314800300055 EN-MIN EN-MAX DATA ERR-T 2314800300056 MEV MEV B B 2314800300057 0.501 0.562 0.0894 0.007 2314800300058 0.562 0.631 0.110 0.008 2314800300059 0.631 0.708 0.18 0.01 2314800300060 0.708 0.794 0.27 0.01 2314800300061 0.794 0.891 0.48 0.02 2314800300062 0.891 1.000 0.88 0.03 2314800300063 1.00 1.12 1.25 0.04 2314800300064 1.12 1.26 1.38 0.05 2314800300065 1.26 1.41 1.44 0.05 2314800300066 1.41 1.58 1.52 0.05 2314800300067 1.58 1.78 1.46 0.05 2314800300068 1.78 2.00 1.44 0.05 2314800300069 2.00 2.24 1.45 0.05 2314800300070 2.24 2.51 1.46 0.05 2314800300071 2.51 2.82 1.46 0.05 2314800300072 2.82 3.16 1.49 0.05 2314800300073 3.16 3.55 1.52 0.06 2314800300074 3.55 3.98 1.49 0.06 2314800300075 3.98 4.47 1.45 0.06 2314800300076 4.47 5.01 1.49 0.06 2314800300077 5.01 5.62 1.50 0.06 2314800300078 5.62 6.31 1.68 0.07 2314800300079 6.31 7.08 2.05 0.09 2314800300080 7.08 7.94 2.31 0.09 2314800300081 7.94 8.91 2.19 0.09 2314800300082 8.91 10.00 2.09 0.09 2314800300083 10.00 11.22 2.18 0.09 2314800300084 11.22 12.59 2.20 0.1 2314800300085 12.59 14.13 2.46 0.1 2314800300086 14.13 15.85 2.46 0.1 2314800300087 15.85 17.78 2.15 0.1 2314800300088 17.78 19.95 2.33 0.1 2314800300089 ENDDATA 34 0 2314800300090 ENDSUBENT 89 0 2314800399999 SUBENT 23148004 20200117 22852314800400001 BIB 8 54 2314800400002 REACTION 1((95-AM-241(N,F),,SIG,,AV)/(92-U-235(N,F),,SIG,,AV)) 2314800400003 2(95-AM-241(N,F),,SIG,,AV) 2314800400004 SAMPLE Samples in chemical form of oxides AmO(2) and U(3)O(8).2314800400005 Sample Mass Thickness Uncertainty 2314800400006 (mg) (microg/cm2) (%) 2314800400007 241Am 0.234 4.65 1.2 2314800400008 241Am 0.230 4.57 1.2 2314800400009 241Am 0.280 5.57 1.2 2314800400010 241Am 0.279 5.56 1.2 2314800400011 241Am 0.304 6.04 1.2 2314800400012 241Am 0.336 6.69 1.2 2314800400013 241Am 0.321 6.38 1.2 2314800400014 241Am 0.277 5.52 1.2 2314800400015 235U 15.2 303 1.4 2314800400016 235U 16.6 330 1.3 2314800400017 Samples were prepared in IPPE,Obninsk,Russia by 2314800400018 painting technique. Uniformity 5-10 % of sample 2314800400019 thickness. 2314800400020 Alpha activity of Am-241 samples 112 MBq/mg. 2314800400021 (95-AM-241,ENR=0.96) Am-241/Am enrichment higher 2314800400022 than 96%. 2314800400023 (92-U-235,ENR=0.99992) U-235 isotopically pure. 2314800400024 All samples were exposed to the same neutron flux and 2314800400025 were measured with nearly identical detectors showing 2314800400026 very similar signal shapes. 2314800400027 MONITOR 2(92-U-235(N,F),,SIG) 2314800400028 MONIT-REF 2(,,3,ENDF/B-VII.0,,2006) 2314800400029 (,M.B.Chadwick+,J,NDS,107,2931,2006) 2314800400030 CORRECTION For dead time effects( average about 6%) . 2314800400031 For detection efficiency (5.4 %). 2314800400032 For absorption losses in the samples. 2314800400033 For the threshold effect imposed by alpha-activity. 2314800400034 ERR-ANALYS (ERR-1) Sample mass of investigated isotope . 2314800400035 (ERR-2) Sample mass of U-235 2314800400036 (ERR-3) Uncertainty due to dead-time correction of the 2314800400037 order of 1% . 2314800400038 (ERR-4) Uncertainty due to detection efficiency 2314800400039 correction of the order of 1% . 2314800400040 (ERR-5) Uncertainty due to high alpha activity of the 2314800400041 sample. 2314800400042 (ERR-6,1.,1.5) Uncertainty due to trance of 0.15% of 2314800400043 Pu-239 impurity - 1.5% at the lowest energy value 2314800400044 500 keV and smaller than 1% above 700 keV. 2314800400045 (MONIT-ERR) U-235 reference cross-section about 2 %. 2314800400046 (ERR-S) Statistical uncertainty per bin about 2%. 2314800400047 (ERR-T) Total uncertainty of cross-sections about 5%. 2314800400048 (EN-ERR,0.1,0.6) Uncertainty in neutron energy results 2314800400049 from the time resolution of the initial proton beam and2314800400050 increases from about 0.1% at 0.5MeV to 0.6% at 20MeV 2314800400051 STATUS (TABLE) Table 2 from Eur.Phys.J.,A49(2013)2 2314800400052 Preliminary data on Fig.3 of C,2010KRAKOW,,113,2010 . 2314800400053 HISTORY (20130510A) M.M. Data were added from EPJ/A,49,2,2013 2314800400054 BIB information was updated. 2314800400055 (20200117U) SD: SAMPLE corrected. 2314800400056 ENDBIB 54 0 2314800400057 COMMON 7 6 2314800400058 ERR-S ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 2314800400059 MONIT-ERR 2 2314800400060 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2314800400061 PER-CENT 2314800400062 2. 1.2 1.35 1. 1. 4. 2314800400063 2. 2314800400064 ENDCOMMON 6 0 2314800400065 DATA 6 15 2314800400066 EN-MIN EN-MAX DATA 1ERR-T 1DATA 2ERR-T 22314800400067 MEV MEV NO-DIM NO-DIM B B 2314800400068 0.501 0.562 0.17 0.02 0.19 0.02 2314800400069 0.562 0.631 0.19 0.02 0.21 0.02 2314800400070 0.631 0.708 0.31 0.02 0.35 0.02 2314800400071 0.708 0.794 0.55 0.03 0.61 0.03 2314800400072 0.794 0.891 0.78 0.03 0.87 0.04 2314800400073 0.891 1.03 1.07 0.04 1.25 0.04 2314800400074 1.03 1.26 1.39 0.03 1.66 0.03 2314800400075 1.26 1.63 1.51 0.03 1.85 0.03 2314800400076 1.63 2.24 1.44 0.02 1.83 0.03 2314800400077 2.24 3.16 1.46 0.02 1.82 0.03 2314800400078 3.16 4.47 1.58 0.04 1.83 0.04 2314800400079 4.47 6.31 1.68 0.05 1.79 0.05 2314800400080 6.31 9.17 1.45 0.04 2.51 0.07 2314800400081 9.17 15.40 1.31 0.04 2.31 0.06 2314800400082 15.40 31.62 1.11 0.02 2.39 0.05 2314800400083 ENDDATA 17 0 2314800400084 ENDSUBENT 83 0 2314800499999 ENDENTRY 4 0 2314899999999