ENTRY C2434 20200110 C189C243400000001 SUBENT C2434001 20200110 C189C243400100001 BIB 11 32 C243400100002 TITLE Binary and Ternary Fission of U238 Induced by C243400100003 Intermediate-Energy He3 Ions C243400100004 AUTHOR (K.W.MacMurdo,J.W.Cobble) C243400100005 REFERENCE (J,PR,182,1303,1969) C243400100006 #doi:10.1103/PhysRev.182.1303 C243400100007 REL-REF (N,C2326006,R.H.Iyer+,J,PR,172,1186,1968) Previous C243400100008 studies of these authors. C243400100009 INSTITUTE (1USAPUR) C243400100010 FACILITY (CYCLO,1USAANL) C243400100011 INC-SPECT The total He3 current involved was 10-30 microA h and C243400100012 the incident He3 beam energy on the top of the C243400100013 stacked foil target was 32 MeV, giving an average C243400100014 bombarding energy in the target of 30.6 MeV. C243400100015 SAMPLE 1-mil natural uranium foils. C243400100016 DETECTOR (GEMUC) Low-background (0.12-0.20 counts/min) gas- C243400100017 flow Geiger counters fitted with surrounding C243400100018 anticoincidence guard counters (manufactured by C243400100019 Tracerlab, Inc., Boston, Mass.) . C243400100020 METHOD (CHSEP,ACTIV) Standard radiochemical techniques were C243400100021 modified for use in the separations, and were C243400100022 repeated many times for the lower-yield isotopes to C243400100023 obtain the required level of decontamination from the C243400100024 gross amounts of high-yield binary fission products. C243400100025 The low-yield binary and ternary products were C243400100026 counted in Geiger counters. Radiochemical purity was C243400100027 established by the characteristic decay and by C243400100028 constant specific activity tests. In many cases it C243400100029 was possible to follow the decay through 4-6 C243400100030 half-lives; resolution of the decay curves from the C243400100031 always-present contaminates was accomplished in an C243400100032 objective manner by computer analysis. C243400100033 HISTORY (20200110C) BP C243400100034 ENDBIB 32 0 C243400100035 COMMON 2 3 C243400100036 EN EN-ERR C243400100037 MEV MEV C243400100038 30.6 0.5 C243400100039 ENDCOMMON 3 0 C243400100040 ENDSUBENT 39 0 C243400199999 SUBENT C2434002 20200110 C189C243400200001 BIB 3 8 C243400200002 REACTION (92-U-238(HE3,F)ELEM/MASS,,SIG) C243400200003 ERR-ANALYS (DATA-ERR) The errors quoted for the individual cross C243400200004 sections were estimated from replicate determinations C243400200005 and uncertainties in the corrections for C243400200006 contributions from spallation impurities, counting C243400200007 efficiency estimations, decay curve resolutions, and C243400200008 in chemical yield determinations. C243400200009 STATUS (TABLE) Table I, page 1304. C243400200010 ENDBIB 8 0 C243400200011 NOCOMMON 0 0 C243400200012 DATA 5 33 C243400200013 ELEMENT MASS DATA DATA-ERR DATA-MAX C243400200014 NO-DIM NO-DIM MB MB MB C243400200015 11.0 24.0 0.000197 0.000039 C243400200016 12.0 28.0 0.000173 0.000012 C243400200017 14.0 31.0 0.000063 0.000012 C243400200018 16.0 38.0 0.0000165 0.0000033 C243400200019 20.0 47.0 0.0000016 C243400200020 25.0 56.0 0.000450 0.000068 C243400200021 28.0 66.0 0.0000159 0.0000016 C243400200022 30.0 72.0 0.097 0.0010 C243400200023 33.0 77.0 1.0 0.1 C243400200024 35.0 83.0 2.6 0.3 C243400200025 38.0 89.0 9.2 0.9 C243400200026 38.0 91.0 14.5 2.2 C243400200027 40.0 95.0 25.7 2.6 C243400200028 40.0 97.0 27.7 2.8 C243400200029 42.0 99.0 31.8 4.8 C243400200030 44.0 105.0 37.0 5.6 C243400200031 47.0 111.0 18.4 2.8 C243400200032 48.0 116.0 14.7 3.0 C243400200033 56.0 140.0 20.8 4.0 C243400200034 58.0 143.0 24.1 3.6 C243400200035 62.0 153.0 2.9 0.4 C243400200036 63.0 157.0 1.06 0.16 C243400200037 64.0 159.0 0.680 0.110 C243400200038 68.0 171.0 0.0152 0.0023 C243400200039 69.0 173.0 0.0053 0.0007 C243400200040 70.0 175.0 0.00304 0.00046 C243400200041 71.0 177.0 0.00132 0.00022 C243400200042 71.0 179.0 0.00100 0.00015 C243400200043 73.0 183.0 0.000211 0.000032 C243400200044 75.0 189.0 0.000046 C243400200045 79.0 199.0 0.0000040 C243400200046 82.0 209.0 0.0000090 C243400200047 82.0 212.0 0.0000018 C243400200048 ENDDATA 35 0 C243400200049 ENDSUBENT 48 0 C243400299999 SUBENT C2434003 20200110 C189C243400300001 BIB 4 8 C243400300002 REACTION (92-U-238(HE3,F),,SIG,,,DERIV) C243400300003 ANALYSIS The total binary-fission cross section of U238 C243400300004 induced by 30.6-MeV He3 ions is estimated by C243400300005 integration of half the area under the mass-yield C243400300006 curve to be 750+-75 mb. C243400300007 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C243400300008 STATUS (DEP,C2434002) C243400300009 (TABLE) page 1306. C243400300010 ENDBIB 8 0 C243400300011 NOCOMMON 0 0 C243400300012 DATA 2 1 C243400300013 DATA DATA-ERR C243400300014 MB MB C243400300015 750.0 75.0 C243400300016 ENDDATA 3 0 C243400300017 ENDSUBENT 16 0 C243400399999 SUBENT C2434004 20200110 C189C243400400001 BIB 3 10 C243400400002 REACTION (92-U-238(HE3,F)ELEM/MASS,,NU) C243400400003 ANALYSIS A preliminary mass-yield curve was constructed from C243400400004 those masses where the isotopic yields and isobaric C243400400005 yields were identical. This curve is independent of C243400400006 any charge distribution recipe. The other isobaric C243400400007 yields were then entered and the values of nubar, the C243400400008 average number of neutrons emitted per fission, were C243400400009 obtained. C243400400010 STATUS (DEP,C2434002) C243400400011 (TABLE) Table I, page 1304. C243400400012 ENDBIB 10 0 C243400400013 NOCOMMON 0 0 C243400400014 DATA 3 28 C243400400015 ELEMENT MASS DATA C243400400016 NO-DIM NO-DIM PRT/FIS C243400400017 25.0 56.0 3.0 C243400400018 28.0 66.0 4.0 C243400400019 30.0 72.0 4.0 C243400400020 33.0 77.0 5.0 C243400400021 35.0 83.0 5.0 C243400400022 38.0 89.0 5.0 C243400400023 38.0 91.0 5.0 C243400400024 40.0 95.0 6.0 C243400400025 40.0 97.0 6.0 C243400400026 42.0 99.0 6.0 C243400400027 44.0 105.0 6.0 C243400400028 47.0 111.0 6.0 C243400400029 48.0 116.0 6.0 C243400400030 56.0 140.0 6.0 C243400400031 58.0 143.0 5.0 C243400400032 62.0 153.0 5.0 C243400400033 63.0 157.0 5.0 C243400400034 64.0 159.0 5.0 C243400400035 68.0 171.0 4.0 C243400400036 69.0 173.0 4.0 C243400400037 70.0 175.0 4.0 C243400400038 71.0 177.0 4.0 C243400400039 71.0 179.0 3.0 C243400400040 73.0 183.0 3.0 C243400400041 75.0 189.0 3.0 C243400400042 79.0 199.0 0.0 C243400400043 82.0 209.0 0.0 C243400400044 82.0 212.0 0.0 C243400400045 ENDDATA 30 0 C243400400046 ENDSUBENT 45 0 C243400499999 ENDENTRY 4 0 C243499999999