ENTRY 14533 20190502 14511453300000001 SUBENT 14533001 20190502 14511453300100001 BIB 11 35 1453300100002 TITLE Mass-spectrometric measurements of 3H, 3He, and 4He 1453300100003 produced in thermal- neutron ternary fission of 235U: 1453300100004 evidence for short-range 4He 1453300100005 AUTHOR (G.Kugler,W.B.Clarke) 1453300100006 INSTITUTE (1CANMCM) 1453300100007 REFERENCE (J,PR/C,5,551,1972) 1453300100008 #doi:10.1103/PhysRevC.5.551 1453300100009 #NSR: 1972KU02 1453300100010 FACILITY (REAC,1CANMCM) The McMaster reactor 1453300100011 INC-SOURCE (REAC) The flux was about 1.5E+13 n/cm**2/sec 1453300100012 INC-SPECT Thermal spectrum 1453300100013 METHOD (EDEG,MASSP) The thick catcher Pb foils, 30 mg/cm2 1453300100014 thick, were placed together to give a total thickness 1453300100015 of 330 mg/cm2, sufficient to stop normally incident 1453300100016 alpha particles of 40 MeV and tritons of 14 MeV. 1453300100017 In order to detect possible short-range components of 1453300100018 the light particles, stacks of Pb foils were arranged 1453300100019 in such a way that He contents could be measured for 1453300100020 each foil individually. 1453300100021 Helium and fission-product Kr were extracted from the 1453300100022 Pb foils by vaporizing these in a vacuum. 3H was 1453300100023 removed completely by the use of titanium sponge at 1453300100024 room temperature. 1453300100025 Calibration of the mass spectrometer for peak-height 1453300100026 response and mass discrimination was achieved by 1453300100027 analyzing atmospheric He prepared from aliquots of air 1453300100028 of known volume introduced immediately after each 1453300100029 fission He sample. 1453300100030 The number of fissions in each sample was determined by1453300100031 absolute measurements of the fission 86Kr content. 1453300100032 SAMPLE (92-U-235,ENR=0.9318) Samples of 235U weighing a few 1453300100033 tenths of 1 mg were prepared by evaporation of weak 1453300100034 uranyl nitrate solution onto Pb foil. 1453300100035 MONITOR (92-U-235(N,F)36-KR-86,IND,FY,,MXW) 1453300100036 HISTORY (20190502C) OG. 1453300100037 ENDBIB 35 0 1453300100038 COMMON 2 3 1453300100039 EN-DUMMY MONIT 1453300100040 EV PRD/FIS 1453300100041 0.0253 2.04 1453300100042 ENDCOMMON 3 0 1453300100043 ENDSUBENT 42 0 1453300199999 SUBENT 14533002 20190502 14511453300200001 BIB 4 6 1453300200002 REACTION (92-U-235(N,F)2-HE-4,TER,FY/DE,,MXW/REL) 1453300200003 ERR-ANALYS (DATA-ERR) No information 1453300200004 COMMENT The first point of the 4He spectrum reflects an obvious1453300200005 departure from the assumed Gaussian energy distribution1453300200006 and is considered evidence for a short-range component.1453300200007 STATUS (CURVE) Correspond to Fig.3 in Phys.Rev.C,5,551,1972 1453300200008 ENDBIB 6 0 1453300200009 NOCOMMON 0 0 1453300200010 DATA 4 11 1453300200011 E-MIN E-MAX DATA DATA-ERR 1453300200012 MEV MEV ARB-UNITS ARB-UNITS 1453300200013 7.7 5.0232E+01 1.9252E+00 1453300200014 7.7 12.8 1.7252E+01 6.3452E-01 1453300200015 12.8 16.8 1.1322E+01 6.5590E-01 1453300200016 16.8 20.4 7.1577E+00 4.2315E-01 1453300200017 20.4 23.7 5.6678E+00 3.1017E-01 1453300200018 23.7 26.6 5.8097E+00 3.6589E-01 1453300200019 26.6 29.2 5.9270E+00 4.0269E-01 1453300200020 29.2 31.8 4.9652E+00 3.1573E-01 1453300200021 31.8 34.2 5.8587E+00 3.6855E-01 1453300200022 34.2 36.5 5.6499E+00 3.3401E-01 1453300200023 36.5 38.7 5.6304E+00 3.5802E-01 1453300200024 ENDDATA 13 0 1453300200025 ENDSUBENT 24 0 1453300299999 SUBENT 14533003 20190502 14511453300300001 BIB 4 6 1453300300002 REACTION (92-U-235(N,F)1-H-3,TER,FY/DE,,MXW/REL) 1453300300003 ERR-ANALYS (DATA-ERR) No information 1453300300004 COMMENT The first point of the 3H spectrum reflects an obvious 1453300300005 departure from the assumed Gaussian energy distribution1453300300006 and is considered evidence for a short-range component.1453300300007 STATUS (CURVE) Correspond to Fig.4 in Phys.Rev.C,5,551,1972 1453300300008 ENDBIB 6 0 1453300300009 NOCOMMON 0 0 1453300300010 DATA 4 11 1453300300011 E-MIN E-MAX DATA DATA-ERR 1453300300012 MEV MEV ARB-UNITS ARB-UNITS 1453300300013 2.4 10.4359 0.6376 1453300300014 2.4 4.1 8.6982 0.5015 1453300300015 4.1 5.5 7.3212 0.4958 1453300300016 5.5 6.7 5.6560 0.3967 1453300300017 6.7 7.9 4.5609 0.3543 1453300300018 7.9 9.1 3.3158 0.3344 1453300300019 9.1 10.0 1.8605 0.2903 1453300300020 10.0 11.0 1.2439 0.2835 1453300300021 11.0 11.9 1.2971 0.2936 1453300300022 11.9 12.8 1.2020 0.2633 1453300300023 12.8 13.7 0.6679 0.2853 1453300300024 ENDDATA 13 0 1453300300025 ENDSUBENT 24 0 1453300399999 SUBENT 14533004 20190507 14511453300400001 BIB 4 11 1453300400002 REACTION 1((92-U-235(N,F)1-H-3,TER,FY,,MXW)/ 1453300400003 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 1453300400004 2((92-U-235(N,F)1-H-3,TER,FY,,MXW)/ 1453300400005 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 1453300400006 3((92-U-235(N,F)1-H-3,TER,FY,,MXW)/ 1453300400007 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 1453300400008 ANALYSIS 1. Long-range particles only 1453300400009 2. Short-range particles only 1453300400010 3. All particles 1453300400011 ERR-ANALYS (DATA-ERR) No information 1453300400012 STATUS (TABLE) Table I in Phys.Rev.C,5,551,1972 1453300400013 ENDBIB 11 0 1453300400014 NOCOMMON 0 0 1453300400015 DATA 6 1 1453300400016 DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3DATA-ERR 31453300400017 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 1453300400018 3.1E-02 0.8E-02 1.E-03 0.6E-03 1.60E-02 0.37E-021453300400019 ENDDATA 3 0 1453300400020 ENDSUBENT 19 0 1453300499999 SUBENT 14533005 20190507 14511453300500001 BIB 4 13 1453300500002 REACTION 1((92-U-235(N,F)2-HE-3,TER,FY,,MXW)/ 1453300500003 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 1453300500004 2((92-U-235(N,F)2-HE-3,TER,FY,,MXW)/ 1453300500005 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 1453300500006 3((92-U-235(N,F)2-HE-3,TER,FY,,MXW)/ 1453300500007 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 1453300500008 ANALYSIS 1. Long-range particles only 1453300500009 2. Short-range particles only. The observed short-range 1453300500010 3He particles may be due to 3H decay, or direct 1453300500011 formation of 3He, or both. 1453300500012 3. All particles. 1453300500013 ERR-ANALYS (DATA-ERR) No information 1453300500014 STATUS (TABLE) Table I in Phys.Rev.C,5,551,1972 1453300500015 ENDBIB 13 0 1453300500016 NOCOMMON 0 0 1453300500017 DATA 8 1 1453300500018 DATA 1+DATA-ERR 1-DATA-ERR 1DATA 2DATA-ERR 2DATA 31453300500019 +DATA-ERR 3-DATA-ERR 3 1453300500020 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 1453300500021 NO-DIM NO-DIM 1453300500022 2.E-06 6.E-06 2.E-06 7.E-06 4.E-06 1.E-061453300500023 3.E-06 1.E-06 1453300500024 ENDDATA 6 0 1453300500025 ENDSUBENT 24 0 1453300599999 SUBENT 14533006 20190507 14511453300600001 BIB 4 9 1453300600002 REACTION 1(92-U-235(N,F)2-HE-4,TER,FY,,MXW) 1453300600003 2(92-U-235(N,F)2-HE-4,TER,FY,,MXW) 1453300600004 3(92-U-235(N,F)2-HE-4,TER,FY,,MXW) 1453300600005 ANALYSIS 1. Long-range particles only 1453300600006 2. Short-range particles only 1453300600007 3. All particles 1453300600008 STATUS (TABLE) Table I in Phys.Rev.C,5,551,1972 1453300600009 ERR-ANALYS (DATA-ERR) The indicated error is 1 standard 1453300600010 deviation of the mean from 12 separate irradiations. 1453300600011 ENDBIB 9 0 1453300600012 NOCOMMON 0 0 3 1453300600013 DATA 6 1 1453300600014 DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3DATA-ERR 31453300600015 PC/FIS PC/FIS PC/FIS PC/FIS PC/FIS PC/FIS 1453300600016 2.18E-01 0.11E-01 2.09E-01 0.10E-01 4.27E-01 0.12E-011453300600017 ENDDATA 3 0 1453300600018 ENDSUBENT 17 0 1453300699999 SUBENT 14533007 20190508 14511453300700001 BIB 4 9 1453300700002 REACTION (92-U-235(N,F)2-HE-4,TER,KEP,,MXW) fit betw. 0-26 MeV 1453300700003 ANALYSIS The spectrum was fitted by a Gaussian distribution 1453300700004 yielding the following parameters: 1453300700005 Fit interval Most probable FWHM 1453300700006 (MeV) energy (MeV) (MeV) 1453300700007 0 to 26. 15.4+-0.2 9.8+-0.4 1453300700008 STATUS (TABLE) Table II in Phys.Rev.C,5,551,1972 1453300700009 (DEP,14533002) 1453300700010 ERR-ANALYS (DATA-ERR) No information 1453300700011 ENDBIB 9 0 1453300700012 NOCOMMON 0 0 1453300700013 DATA 2 1 1453300700014 DATA DATA-ERR 1453300700015 MEV MEV 1453300700016 15.4 0.2 1453300700017 ENDDATA 3 0 1453300700018 ENDSUBENT 17 0 1453300799999 SUBENT 14533008 20190508 14511453300800001 BIB 4 9 1453300800002 REACTION (92-U-235(N,F)1-H-3,TER,KEP,,MXW) fit betw. 0-14 MeV 1453300800003 ANALYSIS The spectrum was fitted by a Gaussian distribution 1453300800004 yielding the following parameters: 1453300800005 Fit interval Most probable FWHM 1453300800006 (MeV) energy (MeV) (MeV) 1453300800007 0 to 14. 8.0+-0.2 5.5+-0.6 1453300800008 STATUS (TABLE) Table II in Phys.Rev.C,5,551,1972 1453300800009 (DEP,14533003) 1453300800010 ERR-ANALYS (DATA-ERR) No information 1453300800011 ENDBIB 9 0 1453300800012 NOCOMMON 0 0 1453300800013 DATA 2 1 1453300800014 DATA DATA-ERR 1453300800015 MEV MEV 1453300800016 8.0 0.2 1453300800017 ENDDATA 3 0 1453300800018 ENDSUBENT 17 0 1453300899999 ENDENTRY 8 0 1453399999999