ENTRY C2326 20180618 C177C232600000001 SUBENT C2326001 20180618 C177C232600100001 BIB 10 44 C232600100002 TITLE Ternary Fission of U238 Induced by C232600100003 Intermediate-Energy Helium Ions C232600100004 AUTHOR (R.H.Iyer,J.W.Cobble) C232600100005 REFERENCE (J,PR,172,1186,1968) C232600100006 #doi:10.1103/PhysRev.172.1186 C232600100007 (J,PRL,17,541,1966) Earlier version, 3He data. C232600100008 #doi:10.1103/PhysRevLett.17.541 C232600100009 INSTITUTE (1USAPUR) C232600100010 FACILITY (CYCLO,1USAANL) C232600100011 (CYCLO,1USABRK) C232600100012 SAMPLE Target foils were placed between ultrapure (99.9999%) C232600100013 silver catcher foils which served to collect C232600100014 recoiling fission fragments in the forward and C232600100015 backward (to the beam) directions. The uranium foils C232600100016 had been analyzed both spectroscopically and C232600100017 radiochemically for some 54 elements which might C232600100018 produce spallation products that could possibly C232600100019 interfere with the fission fragments. C232600100020 METHOD (CHSEP,ACTIV) Standard chemical procedures using C232600100021 carrier techniques were used to separate the various C232600100022 fission products. After irradiation, the target and C232600100023 the catcher foils were removed and dissolved C232600100024 separately in the presence of added carriers. One of C232600100025 the problems encountered in this investigation was to C232600100026 find satisfactory radiochemical procedures capable of C232600100027 separating the trace amounts of radioactivity due to C232600100028 ternary-fission nuclides from gross amounts of binary C232600100029 and spallation products. The activities were counted C232600100030 in suitable chemically stable precipitates in Geiger C232600100031 counters provided with anticoincidence guard counters. C232600100032 ANALYSIS (DECAY) The resolution of the decay curves was aided C232600100033 by a modified Los Alamos PAKAG IBM 7094 computer C232600100034 program. In computing the absolute cross sections for C232600100035 the recoil products Si31, Mn56, and Ni66, the C232600100036 assumption was made that the same fraction of the C232600100037 total activity recoiled out of the thick uranium C232600100038 target as was experimentally found for Mg28 and Sr89 C232600100039 (7% in both the forward and backward direction in C232600100040 each case). C232600100041 CORRECTION Corrections are only necessary to the lower-energy C232600100042 data (<25 MeV) and were made using the known cross C232600100043 sections and an activation analysis of the uranium C232600100044 for aluminum and magnesium content. C232600100045 HISTORY (20180618C) BP C232600100046 ENDBIB 44 0 C232600100047 NOCOMMON 0 0 C232600100048 ENDSUBENT 47 0 C232600199999 SUBENT C2326002 20180618 C177C232600200001 BIB 4 12 C232600200002 REACTION (92-U-238(A,F)ELEM/MASS,,SIG) C232600200003 DETECTOR (GEMUC) Low-background standardized (0.12-0.20 cpm) C232600200004 gas-flow window Geiger counters. C232600200005 ERR-ANALYS (DATA-ERR) The errors quoted for the individual cross- C232600200006 section values are estimated from various C232600200007 uncertainties in the measurements. These errors are C232600200008 largely due to corrections for contributions from C232600200009 spallation impurities, estimation of the counter C232600200010 efficiencies, resolution of decay curves, C232600200011 determination of chemical yields, and counting C232600200012 statistics. C232600200013 STATUS (TABLE) Table I, page 1188 of J,PR,172,1186,1968. C232600200014 ENDBIB 12 0 C232600200015 COMMON 2 3 C232600200016 EN EN-ERR C232600200017 MEV MEV C232600200018 39.0 1.0 C232600200019 ENDCOMMON 3 0 C232600200020 DATA 5 12 C232600200021 ELEMENT MASS DATA DATA-ERR DATA-MAX C232600200022 NO-DIM NO-DIM NB NB NB C232600200023 11.0 24.0 230.0 110.0 C232600200024 12.0 28.0 200.0 50.0 C232600200025 14.0 31.0 60.0 30.0 C232600200026 16.0 38.0 25.0 6.0 C232600200027 20.0 47.0 5.0 C232600200028 25.0 56.0 400.0 100.0 C232600200029 28.0 66.0 29000.0 6000.0 C232600200030 73.0 183.0 1500.0 800.0 C232600200031 73.0 184.0 270.0 140.0 C232600200032 79.0 199.0 5.0 C232600200033 82.0 209.0 3.0 C232600200034 82.0 212.0 4.0 C232600200035 ENDDATA 14 0 C232600200036 ENDSUBENT 35 0 C232600299999 SUBENT C2326003 20180618 C177C232600300001 BIB 6 13 C232600300002 REACTION (92-U-238(A,F)MASS,CHN,SIG) C232600300003 DETECTOR (GEMUC) Low-background standardized (0.12-0.20 cpm) C232600300004 gas-flow window Geiger counters. C232600300005 ANALYSIS The cross sections were calculated from the C232600300006 individual fission-product cross sections assuming C232600300007 the constant-charge-ratio hypothesis for independent C232600300008 yields to be valid. C232600300009 FLAG (1.) These values were estimated from the measured C232600300010 limits as if products have originated from a binary C232600300011 event. C232600300012 MISC-COL (MISC) The number of neutrons estimated to be emitted C232600300013 in the fission process. C232600300014 STATUS (TABLE) Table I, page 1188 of J,PR,172,1186,1968. C232600300015 ENDBIB 13 0 C232600300016 COMMON 2 3 C232600300017 EN EN-ERR C232600300018 MEV MEV C232600300019 39.0 1.0 C232600300020 ENDCOMMON 3 0 C232600300021 DATA 5 12 C232600300022 MASS DATA DATA-MAX MISC FLAG C232600300023 NO-DIM NB NB PRT/FIS NO-DIM C232600300024 24.0 230.0 C232600300025 28.0 200.0 C232600300026 31.0 60.0 C232600300027 38.0 25.0 C232600300028 47.0 5.0 C232600300029 56.0 400.0 4.0 C232600300030 66.0 29000.00 5.0 C232600300031 183.0 16000.0 4.0 C232600300032 184.0 300.0 4.0 C232600300033 199.0 5.0 3.0 1. C232600300034 209.0 4.0 2.0 1. C232600300035 212.0 13.0 2.0 1. C232600300036 ENDDATA 14 0 C232600300037 ENDSUBENT 36 0 C232600399999 SUBENT C2326004 20180618 C177C232600400001 BIB 4 6 C232600400002 REACTION (92-U-238(A,F)12-MG-28,,SIG,,TT) C232600400003 DETECTOR (GEMUC) Low-background standardized (0.12-0.20 cpm) C232600400004 gas-flow window Geiger counters. C232600400005 CORRECTION Measured total cross section in the thick target C232600400006 corrected for recoil losses. C232600400007 STATUS (TABLE) Table II, Page 1189 of J,PR,172,1186,1968. C232600400008 ENDBIB 6 0 C232600400009 NOCOMMON 0 0 C232600400010 DATA 2 4 C232600400011 EN-APRX DATA C232600400012 MEV NB C232600400013 39.0 190.0 C232600400014 62.5 1450.0 C232600400015 78.5 3000.0 C232600400016 118.5 9400.0 C232600400017 ENDDATA 6 0 C232600400018 ENDSUBENT 17 0 C232600499999 SUBENT C2326005 20180618 C177C232600500001 BIB 4 6 C232600500002 REACTION (92-U-238(A,F)38-SR-89,,SIG,,TT) C232600500003 DETECTOR (GEMUC) Low-background standardized (0.12-0.20 cpm) C232600500004 gas-flow window Geiger counters. C232600500005 CORRECTION Measured total cross section in the thick target C232600500006 corrected for recoil losses. C232600500007 STATUS (TABLE) Table II, Page 1189 of J,PR,172,1186,1968. C232600500008 ENDBIB 6 0 C232600500009 NOCOMMON 0 0 C232600500010 DATA 2 3 C232600500011 EN-APRX DATA C232600500012 MEV MB C232600500013 39.0 13.6 C232600500014 78.5 42.0 C232600500015 118.5 38.0 C232600500016 ENDDATA 5 0 C232600500017 ENDSUBENT 16 0 C232600599999 SUBENT C2326006 20180622 C177C232600600001 BIB 4 5 C232600600002 REACTION (92-U-238(HE3,F)ELEM/MASS,,SIG) C232600600003 DETECTOR (GEMUC) Low-background standardized (0.12-0.20 cpm) C232600600004 gas-flow window Geiger counters. C232600600005 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C232600600006 STATUS (TABLE) Table I, page 542 of J,PRL,17,541,1966. C232600600007 ENDBIB 5 0 C232600600008 NOCOMMON 0 0 C232600600009 DATA 6 6 C232600600010 EN EN-ERR ELEMENT MASS DATA DATA-ERR C232600600011 MEV MEV NO-DIM NO-DIM NB NB C232600600012 32.6 1.0 12.0 28.0 15.5 4.6C232600600013 32.6 1.0 38.0 89.0 1.8E+06 C232600600014 38.8 0.5 12.0 28.0 135.0 2.7C232600600015 39.4 0.5 12.0 28.0 172.0 35.0C232600600016 39.4 0.5 16.0 38.0 24.2 5.0C232600600017 39.4 0.5 38.0 89.0 4.7E+06 C232600600018 ENDDATA 8 0 C232600600019 ENDSUBENT 18 0 C232600699999 SUBENT C2326007 20180622 C177C232600700001 BIB 3 3 C232600700002 REACTION (92-U-238(HE3,F),,SIG,,AV) C232600700003 DETECTOR (TRD) Plastic films C232600700004 STATUS (TABLE) Table I, page 542 of J,PRL,17,541,1966. C232600700005 ENDBIB 3 0 C232600700006 NOCOMMON 0 0 C232600700007 DATA 3 3 C232600700008 EN EN-ERR DATA C232600700009 MEV MEV MB C232600700010 32.6 1.0 160.0 C232600700011 38.8 0.5 560.0 C232600700012 39.4 0.5 600.0 C232600700013 ENDDATA 5 0 C232600700014 ENDSUBENT 13 0 C232600799999 ENDENTRY 7 0 C232699999999