ENTRY 14533 20190502 145114533 0 1 SUBENT 14533001 20190502 145114533 1 1 BIB 11 35 14533 1 2 TITLE Mass-spectrometric measurements of 3H, 3He, and 4He 14533 1 3 produced in thermal- neutron ternary fission of 235U: 14533 1 4 evidence for short-range 4He 14533 1 5 AUTHOR (G.Kugler,W.B.Clarke) 14533 1 6 INSTITUTE (1CANMCM) 14533 1 7 REFERENCE (J,PR/C,5,551,1972) 14533 1 8 #doi:10.1103/PhysRevC.5.551 14533 1 9 #NSR: 1972KU02 14533 1 10 FACILITY (REAC,1CANMCM) The McMaster reactor 14533 1 11 INC-SOURCE (REAC) The flux was about 1.5E+13 n/cm**2/sec 14533 1 12 INC-SPECT Thermal spectrum 14533 1 13 METHOD (EDEG,MASSP) The thick catcher Pb foils, 30 mg/cm2 14533 1 14 thick, were placed together to give a total thickness 14533 1 15 of 330 mg/cm2, sufficient to stop normally incident 14533 1 16 alpha particles of 40 MeV and tritons of 14 MeV. 14533 1 17 In order to detect possible short-range components of 14533 1 18 the light particles, stacks of Pb foils were arranged 14533 1 19 in such a way that He contents could be measured for 14533 1 20 each foil individually. 14533 1 21 Helium and fission-product Kr were extracted from the 14533 1 22 Pb foils by vaporizing these in a vacuum. 3H was 14533 1 23 removed completely by the use of titanium sponge at 14533 1 24 room temperature. 14533 1 25 Calibration of the mass spectrometer for peak-height 14533 1 26 response and mass discrimination was achieved by 14533 1 27 analyzing atmospheric He prepared from aliquots of air 14533 1 28 of known volume introduced immediately after each 14533 1 29 fission He sample. 14533 1 30 The number of fissions in each sample was determined by14533 1 31 absolute measurements of the fission 86Kr content. 14533 1 32 SAMPLE (92-U-235,ENR=0.9318) Samples of 235U weighing a few 14533 1 33 tenths of 1 mg were prepared by evaporation of weak 14533 1 34 uranyl nitrate solution onto Pb foil. 14533 1 35 MONITOR (92-U-235(N,F)36-KR-86,IND,FY,,MXW) 14533 1 36 HISTORY (20190502C) OG. 14533 1 37 ENDBIB 35 0 14533 1 38 COMMON 2 3 14533 1 39 EN-DUMMY MONIT 14533 1 40 EV PRD/FIS 14533 1 41 0.0253 2.04 14533 1 42 ENDCOMMON 3 0 14533 1 43 ENDSUBENT 42 0 14533 199999 SUBENT 14533002 20190502 145114533 2 1 BIB 4 6 14533 2 2 REACTION (92-U-235(N,F)2-HE-4,TER,FY/DE,,MXW/REL) 14533 2 3 ERR-ANALYS (DATA-ERR) No information 14533 2 4 COMMENT The first point of the 4He spectrum reflects an obvious14533 2 5 departure from the assumed Gaussian energy distribution14533 2 6 and is considered evidence for a short-range component.14533 2 7 STATUS (CURVE) Correspond to Fig.3 in Phys.Rev.C,5,551,1972 14533 2 8 ENDBIB 6 0 14533 2 9 NOCOMMON 0 0 14533 2 10 DATA 4 11 14533 2 11 E-MIN E-MAX DATA DATA-ERR 14533 2 12 MEV MEV ARB-UNITS ARB-UNITS 14533 2 13 7.7 5.0232E+01 1.9252E+00 14533 2 14 7.7 12.8 1.7252E+01 6.3452E-01 14533 2 15 12.8 16.8 1.1322E+01 6.5590E-01 14533 2 16 16.8 20.4 7.1577E+00 4.2315E-01 14533 2 17 20.4 23.7 5.6678E+00 3.1017E-01 14533 2 18 23.7 26.6 5.8097E+00 3.6589E-01 14533 2 19 26.6 29.2 5.9270E+00 4.0269E-01 14533 2 20 29.2 31.8 4.9652E+00 3.1573E-01 14533 2 21 31.8 34.2 5.8587E+00 3.6855E-01 14533 2 22 34.2 36.5 5.6499E+00 3.3401E-01 14533 2 23 36.5 38.7 5.6304E+00 3.5802E-01 14533 2 24 ENDDATA 13 0 14533 2 25 ENDSUBENT 24 0 14533 299999 SUBENT 14533003 20190502 145114533 3 1 BIB 4 6 14533 3 2 REACTION (92-U-235(N,F)1-H-3,TER,FY/DE,,MXW/REL) 14533 3 3 ERR-ANALYS (DATA-ERR) No information 14533 3 4 COMMENT The first point of the 3H spectrum reflects an obvious 14533 3 5 departure from the assumed Gaussian energy distribution14533 3 6 and is considered evidence for a short-range component.14533 3 7 STATUS (CURVE) Correspond to Fig.4 in Phys.Rev.C,5,551,1972 14533 3 8 ENDBIB 6 0 14533 3 9 NOCOMMON 0 0 14533 3 10 DATA 4 11 14533 3 11 E-MIN E-MAX DATA DATA-ERR 14533 3 12 MEV MEV ARB-UNITS ARB-UNITS 14533 3 13 2.4 10.4359 0.6376 14533 3 14 2.4 4.1 8.6982 0.5015 14533 3 15 4.1 5.5 7.3212 0.4958 14533 3 16 5.5 6.7 5.6560 0.3967 14533 3 17 6.7 7.9 4.5609 0.3543 14533 3 18 7.9 9.1 3.3158 0.3344 14533 3 19 9.1 10.0 1.8605 0.2903 14533 3 20 10.0 11.0 1.2439 0.2835 14533 3 21 11.0 11.9 1.2971 0.2936 14533 3 22 11.9 12.8 1.2020 0.2633 14533 3 23 12.8 13.7 0.6679 0.2853 14533 3 24 ENDDATA 13 0 14533 3 25 ENDSUBENT 24 0 14533 399999 SUBENT 14533004 20190507 145114533 4 1 BIB 4 11 14533 4 2 REACTION 1((92-U-235(N,F)1-H-3,TER,FY,,MXW)/ 14533 4 3 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 14533 4 4 2((92-U-235(N,F)1-H-3,TER,FY,,MXW)/ 14533 4 5 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 14533 4 6 3((92-U-235(N,F)1-H-3,TER,FY,,MXW)/ 14533 4 7 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 14533 4 8 ANALYSIS 1. Long-range particles only 14533 4 9 2. Short-range particles only 14533 4 10 3. All particles 14533 4 11 ERR-ANALYS (DATA-ERR) No information 14533 4 12 STATUS (TABLE) Table I in Phys.Rev.C,5,551,1972 14533 4 13 ENDBIB 11 0 14533 4 14 NOCOMMON 0 0 14533 4 15 DATA 6 1 14533 4 16 DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3DATA-ERR 314533 4 17 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 14533 4 18 3.1E-02 0.8E-02 1.E-03 0.6E-03 1.60E-02 0.37E-0214533 4 19 ENDDATA 3 0 14533 4 20 ENDSUBENT 19 0 14533 499999 SUBENT 14533005 20190507 145114533 5 1 BIB 4 13 14533 5 2 REACTION 1((92-U-235(N,F)2-HE-3,TER,FY,,MXW)/ 14533 5 3 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 14533 5 4 2((92-U-235(N,F)2-HE-3,TER,FY,,MXW)/ 14533 5 5 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 14533 5 6 3((92-U-235(N,F)2-HE-3,TER,FY,,MXW)/ 14533 5 7 (92-U-235(N,F)2-HE-4,TER,FY,,MXW)) 14533 5 8 ANALYSIS 1. Long-range particles only 14533 5 9 2. Short-range particles only. The observed short-range 14533 5 10 3He particles may be due to 3H decay, or direct 14533 5 11 formation of 3He, or both. 14533 5 12 3. All particles. 14533 5 13 ERR-ANALYS (DATA-ERR) No information 14533 5 14 STATUS (TABLE) Table I in Phys.Rev.C,5,551,1972 14533 5 15 ENDBIB 13 0 14533 5 16 NOCOMMON 0 0 14533 5 17 DATA 8 1 14533 5 18 DATA 1+DATA-ERR 1-DATA-ERR 1DATA 2DATA-ERR 2DATA 314533 5 19 +DATA-ERR 3-DATA-ERR 3 14533 5 20 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 14533 5 21 NO-DIM NO-DIM 14533 5 22 2.E-06 6.E-06 2.E-06 7.E-06 4.E-06 1.E-0614533 5 23 3.E-06 1.E-06 14533 5 24 ENDDATA 6 0 14533 5 25 ENDSUBENT 24 0 14533 599999 SUBENT 14533006 20190507 145114533 6 1 BIB 4 9 14533 6 2 REACTION 1(92-U-235(N,F)2-HE-4,TER,FY,,MXW) 14533 6 3 2(92-U-235(N,F)2-HE-4,TER,FY,,MXW) 14533 6 4 3(92-U-235(N,F)2-HE-4,TER,FY,,MXW) 14533 6 5 ANALYSIS 1. Long-range particles only 14533 6 6 2. Short-range particles only 14533 6 7 3. All particles 14533 6 8 STATUS (TABLE) Table I in Phys.Rev.C,5,551,1972 14533 6 9 ERR-ANALYS (DATA-ERR) The indicated error is 1 standard 14533 6 10 deviation of the mean from 12 separate irradiations. 14533 6 11 ENDBIB 9 0 14533 6 12 NOCOMMON 0 0 3 14533 6 13 DATA 6 1 14533 6 14 DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3DATA-ERR 314533 6 15 PC/FIS PC/FIS PC/FIS PC/FIS PC/FIS PC/FIS 14533 6 16 2.18E-01 0.11E-01 2.09E-01 0.10E-01 4.27E-01 0.12E-0114533 6 17 ENDDATA 3 0 14533 6 18 ENDSUBENT 17 0 14533 699999 SUBENT 14533007 20190508 145114533 7 1 BIB 4 9 14533 7 2 REACTION (92-U-235(N,F)2-HE-4,TER,KEP,,MXW) fit betw. 0-26 MeV 14533 7 3 ANALYSIS The spectrum was fitted by a Gaussian distribution 14533 7 4 yielding the following parameters: 14533 7 5 Fit interval Most probable FWHM 14533 7 6 (MeV) energy (MeV) (MeV) 14533 7 7 0 to 26. 15.4+-0.2 9.8+-0.4 14533 7 8 STATUS (TABLE) Table II in Phys.Rev.C,5,551,1972 14533 7 9 (DEP,14533002) 14533 7 10 ERR-ANALYS (DATA-ERR) No information 14533 7 11 ENDBIB 9 0 14533 7 12 NOCOMMON 0 0 14533 7 13 DATA 2 1 14533 7 14 DATA DATA-ERR 14533 7 15 MEV MEV 14533 7 16 15.4 0.2 14533 7 17 ENDDATA 3 0 14533 7 18 ENDSUBENT 17 0 14533 799999 SUBENT 14533008 20190508 145114533 8 1 BIB 4 9 14533 8 2 REACTION (92-U-235(N,F)1-H-3,TER,KEP,,MXW) fit betw. 0-14 MeV 14533 8 3 ANALYSIS The spectrum was fitted by a Gaussian distribution 14533 8 4 yielding the following parameters: 14533 8 5 Fit interval Most probable FWHM 14533 8 6 (MeV) energy (MeV) (MeV) 14533 8 7 0 to 14. 8.0+-0.2 5.5+-0.6 14533 8 8 STATUS (TABLE) Table II in Phys.Rev.C,5,551,1972 14533 8 9 (DEP,14533003) 14533 8 10 ERR-ANALYS (DATA-ERR) No information 14533 8 11 ENDBIB 9 0 14533 8 12 NOCOMMON 0 0 14533 8 13 DATA 2 1 14533 8 14 DATA DATA-ERR 14533 8 15 MEV MEV 14533 8 16 8.0 0.2 14533 8 17 ENDDATA 3 0 14533 8 18 ENDSUBENT 17 0 14533 899999 ENDENTRY 8 0 1453399999999