ENTRY C2199 20151210 C155C219900000001 SUBENT C2199001 20151210 C155C219900100001 BIB 12 29 C219900100002 TITLE Fission of 232Th by 9.5 MeV Deuterons: Yield-Mass CurveC219900100003 AUTHOR (M.V.Ramaniah,A.C.Wahl) C219900100004 REFERENCE (J,JIN,24,1185,1962) C219900100005 #doi:10.1016/0022-1902(62)80191-2 C219900100006 REL-REF (O,30947001,R.H.Iyer+,J,JIN,25,465,1963) C219900100007 INSTITUTE (1USAWAS) C219900100008 FACILITY (CYCLO,1USAWAS) C219900100009 (REAC,1USALAS) C219900100010 INC-SPECT The energies of the deuterons inducing fission varied C219900100011 from 8.5 to 9.9 MeV, one-half of the fissions being C219900100012 produced by deuterons with energies above 9.5 MeV. C219900100013 Less than 0.5 per cent of the fissions were induced C219900100014 by neutrons. C219900100015 SAMPLE 2 mil target foils. C219900100016 DETECTOR (PROPC) A flow-type beta-proportional counter. C219900100017 METHOD (ACTIV,STTA,CHSEP) Uranium with normal isotopic C219900100018 composition was irradiated in the Los Alamos C219900100019 Homogeneous Reactor in a thermal flux of 5x10 11 C219900100020 cm-2sec-1, while thorium stacked target foils were C219900100021 irradiated with a deuteron beam of the Washington C219900100022 University Cyclotron. Relative yields were determined C219900100023 by comparison of fission-product radioactivities from C219900100024 232Th fission induced by 9.5 MeV deuterons with those C219900100025 from 235U thermal neutron fission, for which fission C219900100026 yields are known. Irradiated targets were dissolved C219900100027 in hydrochloric acid, and aliquots of the solutions C219900100028 were taken for radiochemical analysis. C219900100029 EXP-YEAR (1956) C219900100030 HISTORY (20151210C) BP C219900100031 ENDBIB 29 0 C219900100032 NOCOMMON 0 0 C219900100033 ENDSUBENT 32 0 C219900199999 SUBENT C2199002 20151210 C155C219900200001 BIB 4 13 C219900200002 REACTION (((90-TH-232(D,F)ELEM/MASS,CUM,FY)/ C219900200003 (90-TH-232(D,F)42-MO-99,CUM,FY))// C219900200004 ((92-U-235(N,F)ELEM/MASS,CUM,FY,,MXW)/ C219900200005 (92-U-235(N,F)42-MO-99,CUM,FY,,MXW))) C219900200006 RESULT (RVAL) C219900200007 ERR-ANALYS (DATA-ERR) Many sources of uncertainties are C219900200008 inherited in this treatment: probably the largest is C219900200009 contributes by the assumption of a smooth, C219900200010 symmetrical yield-mass curve. Another possible source C219900200011 of uncertainty is the assumption that the generic C219900200012 history of fission product is the same for two C219900200013 fission reactions. C219900200014 STATUS (TABLE) Table I, page 1187. C219900200015 ENDBIB 13 0 C219900200016 COMMON 3 3 C219900200017 EN-MIN-NM EN-MAX-NM EN-DUM-DN C219900200018 MEV MEV EV C219900200019 8.5 9.9 0.0253 C219900200020 ENDCOMMON 3 0 C219900200021 DATA 5 17 C219900200022 ELEMENT MASS ISOMER DATA DATA-ERR C219900200023 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM C219900200024 35. 83. 4.44 0.07 C219900200025 38. 89. 1.70 0.02 C219900200026 38. 91. 1.50 0.03 C219900200027 40. 97. 1.27 0.02 C219900200028 42. 99. 1.00 C219900200029 46. 112. 103.0 4.0 C219900200030 47. 111. 86.0 2.0 C219900200031 48. 115. 1. 123.0 4.0 C219900200032 48. 115. 0. 122.0 4.0 C219900200033 53. 131. 2.13 0.06 C219900200034 53. 133. 1.22 0.04 C219900200035 56. 140. 1.30 0.04 C219900200036 58. 141. 1.37 0.04 C219900200037 58. 143. 1.02 0.02 C219900200038 58. 144. 0.99 0.04 C219900200039 62. 153. 1.56 C219900200040 63. 155. 3.24 C219900200041 ENDDATA 19 0 C219900200042 ENDSUBENT 41 0 C219900299999 SUBENT C2199003 20151210 C155C219900300001 BIB 4 9 C219900300002 REACTION (90-TH-232(D,F),PR,NU) C219900300003 ANALYSIS Obtained yield-mass curve is symmetrical about A=115, C219900300004 which implies an average loss of 4 neutrons during or C219900300005 prior to fission. Shifts in the symmetry point of >1 C219900300006 mass unit give curves with appreciable deviations C219900300007 from the experimental data. We conclude, therefore, C219900300008 that neutron multiplicity is 4+-1. C219900300009 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C219900300010 STATUS (TABLE) abstract, page 1185. C219900300011 ENDBIB 9 0 C219900300012 COMMON 2 3 C219900300013 EN-MIN EN-MAX C219900300014 MEV MEV C219900300015 8.5 9.9 C219900300016 ENDCOMMON 3 0 C219900300017 DATA 2 1 C219900300018 DATA DATA-ERR C219900300019 PC/FIS PC/FIS C219900300020 4.0 1.0 C219900300021 ENDDATA 3 0 C219900300022 ENDSUBENT 21 0 C219900399999 SUBENT C2199004 20151210 C155C219900400001 BIB 5 12 C219900400002 REACTION (90-TH-232(D,F)ELEM/MASS,CUM,FY) C219900400003 REL-REF (R,,S.Katcoff+,J,NUC,18,(11),201,1960) C219900400004 ANALYSIS Relative values of fission yields for the 232Th(d,f) C219900400005 reaction were obtained by multiplying the R values by C219900400006 the known fission yields from the 235U(n,f) reaction. C219900400007 These relative yields were then used to construct a C219900400008 smooth, symmetrical yield-mass curve. The curve was C219900400009 normalized to give a total yield of 200 per cent. C219900400010 COMMENT Authors give fission yields in %, which are compiled C219900400011 in EXFOR as PC/FIS, without change in the numerical C219900400012 values. C219900400013 STATUS (TABLE) Table I, page 1187. C219900400014 ENDBIB 12 0 C219900400015 COMMON 2 3 C219900400016 EN-MIN EN-MAX C219900400017 MEV MEV C219900400018 8.5 9.9 C219900400019 ENDCOMMON 3 0 C219900400020 DATA 4 17 C219900400021 ELEMENT MASS ISOMER DATA C219900400022 NO-DIM NO-DIM NO-DIM PC/FIS C219900400023 35. 83. 1.6 C219900400024 38. 89. 5.4 C219900400025 38. 91. 5.8 C219900400026 40. 97. 5. C219900400027 42. 99. 4. C219900400028 46. 112. 0.68 C219900400029 47. 111. 1.1 C219900400030 48. 115. 1. 6.E-02 C219900400031 48. 115. 0. 0.78 C219900400032 53. 131. 4.1 C219900400033 53. 133. 5.3 C219900400034 56. 140. 5.5 C219900400035 58. 141. 5.8 C219900400036 58. 143. 4. C219900400037 58. 144. 3.7 C219900400038 62. 153. 0.17 C219900400039 63. 155. 3.E-02 C219900400040 ENDDATA 19 0 C219900400041 ENDSUBENT 40 0 C219900499999 ENDENTRY 4 0 C219999999999