ENTRY C2497 20200310 C192C249700000001 SUBENT C2497001 20200310 C192C249700100001 BIB 11 30 C249700100002 TITLE Mass spectrometric determination of Rb fission yields C249700100003 from 3He and 4He induced fission of 238U and 232Th C249700100004 AUTHOR (P.L.Reeder) C249700100005 REFERENCE (J,CJC,61,786,1983) C249700100006 #doi:10.1139/v83-145 C249700100007 INSTITUTE (1USABNW) C249700100008 FACILITY (CYCLO,1USAWAS) 54-in sector-focused cyclotron at C249700100009 Washington University, St. Louis. C249700100010 INC-SPECT At 32-MeV, a 3He beam intensity of I microA gave a C249700100011 typical 91Rb counting rate of about I5,000 ions/s. C249700100012 SAMPLE The target consisted of 238U or 232Th powder (10 C249700100013 microm size) intimately mixed with graphite powder C249700100014 and pressed into a small block about 100 mg/cm2 C249700100015 thick. The ratio of metal-to-graphite was 4-to-1 by C249700100016 weight. C249700100017 ERR-ANALYS (DATA-ERR) Uncertainties are based only on the C249700100018 standard deviation of the mean values. Values with no C249700100019 uncertainty were used to normalize different runs. C249700100020 CORRECTION The correction factor for growth, decay, and C249700100021 diffusion was implemented. The saturation factor C249700100022 corrected for those isotopes whose half-lives were an C249700100023 appreciable fraction of the total run time. The C249700100024 maximum corrections were 40% for mass 89 and 2% for C249700100025 mass 90 for a run with 34 MeV 3He on a 238U target. C249700100026 The correction for radioactive decay requires C249700100027 knowledge of the diffusion components. C249700100028 DECAY-DATA (37-RB-89,900.0SEC) C249700100029 (37-RB-92,4.4SEC) C249700100030 (37-RB-94,2.7SEC) C249700100031 HISTORY (20200310C) BP C249700100032 ENDBIB 30 0 C249700100033 COMMON 1 3 C249700100034 ELEMENT C249700100035 NO-DIM C249700100036 37.0 C249700100037 ENDCOMMON 3 0 C249700100038 ENDSUBENT 37 0 C249700199999 SUBENT C2497002 20200310 C192C249700200001 BIB 3 12 C249700200002 REACTION ((92-U-238(HE3,F)ELEM/MASS,CUM,FY)/ C249700200003 (92-U-238(HE3,F)37-RB-90,CUM,FY)) C249700200004 METHOD (MASSP) The relative cumulative yields of Rb isotopes C249700200005 were measured by scanning the mass spectrum rapidly C249700200006 while the cyclotron beam was on continuously. The C249700200007 mass spectrum was scanned by holding the magnetic C249700200008 field constant and imposing a triangular waveform to C249700200009 the accelerating voltage at a repetition rate of 25 C249700200010 cycles/s. Sweep up and sweep down mass spectra were C249700200011 stored separately in 100 channel segments of a C249700200012 multiscaler. C249700200013 STATUS (TABLE) Table 2, page 788. C249700200014 ENDBIB 12 0 C249700200015 COMMON 3 3 C249700200016 EN +EN-ERR -EN-ERR C249700200017 MEV MEV MEV C249700200018 25.3 2.7 3.6 C249700200019 ENDCOMMON 3 0 C249700200020 DATA 3 7 C249700200021 MASS DATA DATA-ERR C249700200022 NO-DIM NO-DIM NO-DIM C249700200023 89.0 1.48 0.2 C249700200024 90.0 1.00 0.05 C249700200025 91.0 0.93 C249700200026 92.0 0.77 0.01 C249700200027 93.0 0.62 0.01 C249700200028 94.0 0.35 0.01 C249700200029 95.0 0.26 0.05 C249700200030 ENDDATA 9 0 C249700200031 ENDSUBENT 30 0 C249700299999 SUBENT C2497003 20200310 C192C249700300001 BIB 3 12 C249700300002 REACTION ((92-U-238(HE3,F)ELEM/MASS,CUM,FY)/ C249700300003 (92-U-238(HE3,F)37-RB-90,CUM,FY)) C249700300004 METHOD (MASSP) The relative cumulative yields of Rb isotopes C249700300005 were measured by scanning the mass spectrum rapidly C249700300006 while the cyclotron beam was on continuously. The C249700300007 mass spectrum was scanned by holding the magnetic C249700300008 field constant and imposing a triangular waveform to C249700300009 the accelerating voltage at a repetition rate of 25 C249700300010 cycles/s. Sweep up and sweep down mass spectra were C249700300011 stored separately in 100 channel segments of a C249700300012 multiscaler. C249700300013 STATUS (TABLE) Table 2, page 788. C249700300014 ENDBIB 12 0 C249700300015 COMMON 3 3 C249700300016 EN +EN-ERR -EN-ERR C249700300017 MEV MEV MEV C249700300018 28.1 3.9 6.4 C249700300019 ENDCOMMON 3 0 C249700300020 DATA 3 9 C249700300021 MASS DATA DATA-ERR C249700300022 NO-DIM NO-DIM NO-DIM C249700300023 89.0 0.96 0.04 C249700300024 90.0 1.00 0.04 C249700300025 91.0 0.91 0.02 C249700300026 92.0 0.71 C249700300027 93.0 0.55 0.01 C249700300028 94.0 0.28 0.01 C249700300029 95.0 0.15 0.02 C249700300030 96.0 0.047 0.007 C249700300031 97.0 0.012 0.006 C249700300032 ENDDATA 11 0 C249700300033 ENDSUBENT 32 0 C249700399999 SUBENT C2497004 20200310 C192C249700400001 BIB 3 12 C249700400002 REACTION ((92-U-238(A,F)ELEM/MASS,CUM,FY)/ C249700400003 (92-U-238(A,F)37-RB-91,CUM,FY)) C249700400004 METHOD (MASSP) The relative cumulative yields of Rb isotopes C249700400005 were measured by scanning the mass spectrum rapidly C249700400006 while the cyclotron beam was on continuously. The C249700400007 mass spectrum was scanned by holding the magnetic C249700400008 field constant and imposing a triangular waveform to C249700400009 the accelerating voltage at a repetition rate of 25 C249700400010 cycles/s. Sweep up and sweep down mass spectra were C249700400011 stored separately in 100 channel segments of a C249700400012 multiscaler. C249700400013 STATUS (TABLE) Table 2, page 788. C249700400014 ENDBIB 12 0 C249700400015 COMMON 3 3 C249700400016 EN +EN-ERR -EN-ERR C249700400017 MEV MEV MEV C249700400018 25.5 2.0 4.2 C249700400019 ENDCOMMON 3 0 C249700400020 DATA 3 8 C249700400021 MASS DATA DATA-ERR C249700400022 NO-DIM NO-DIM NO-DIM C249700400023 89.0 0.90 0.02 C249700400024 90.0 0.96 0.03 C249700400025 91.0 1.00 0.05 C249700400026 92.0 0.82 C249700400027 93.0 0.71 0.04 C249700400028 94.0 0.32 0.03 C249700400029 95.0 0.15 0.01 C249700400030 96.0 0.08 0.04 C249700400031 ENDDATA 10 0 C249700400032 ENDSUBENT 31 0 C249700499999 SUBENT C2497005 20200310 C192C249700500001 BIB 3 12 C249700500002 REACTION ((90-TH-232(HE3,F)ELEM/MASS,CUM,FY)/ C249700500003 (90-TH-232(HE3,F)37-RB-90,CUM,FY)) C249700500004 METHOD (MASSP) The relative cumulative yields of Rb isotopes C249700500005 were measured by scanning the mass spectrum rapidly C249700500006 while the cyclotron beam was on continuously. The C249700500007 mass spectrum was scanned by holding the magnetic C249700500008 field constant and imposing a triangular waveform to C249700500009 the accelerating voltage at a repetition rate of 25 C249700500010 cycles/s. Sweep up and sweep down mass spectra were C249700500011 stored separately in 100 channel segments of a C249700500012 multiscaler. C249700500013 STATUS (TABLE) Table 2, page 788. C249700500014 ENDBIB 12 0 C249700500015 COMMON 3 3 C249700500016 EN +EN-ERR -EN-ERR C249700500017 MEV MEV MEV C249700500018 28.1 3.9 6.7 C249700500019 ENDCOMMON 3 0 C249700500020 DATA 3 7 C249700500021 MASS DATA DATA-ERR C249700500022 NO-DIM NO-DIM NO-DIM C249700500023 89.0 0.30 0.06 C249700500024 90.0 1.00 0.03 C249700500025 91.0 0.93 C249700500026 92.0 0.74 0.02 C249700500027 93.0 0.47 0.02 C249700500028 94.0 0.31 0.01 C249700500029 95.0 0.18 0.03 C249700500030 ENDDATA 9 0 C249700500031 ENDSUBENT 30 0 C249700599999 SUBENT C2497006 20200310 C192C249700600001 BIB 3 10 C249700600002 REACTION ((92-U-238(HE3,F)ELEM/MASS,IND,FY)/ C249700600003 (92-U-238(HE3,F)37-RB-91,IND,FY)) C249700600004 METHOD (MASSP) The measurement of Rb independent yields must C249700600005 be done in a time interval short compared to the C249700600006 radioactive half-lives of the Kr precursors. Thus a C249700600007 pulsed beam procedure was used in which mass spectra C249700600008 were recorded with "beam-on" for a short time C249700600009 interval and were separately recorded with "beam-off" C249700600010 for the same time interval. C249700600011 STATUS (TABLE) Table 3, page 790. C249700600012 ENDBIB 10 0 C249700600013 COMMON 3 3 C249700600014 EN +EN-ERR -EN-ERR C249700600015 MEV MEV MEV C249700600016 25.3 2.7 3.6 C249700600017 ENDCOMMON 3 0 C249700600018 DATA 3 8 C249700600019 MASS DATA DATA-ERR C249700600020 NO-DIM NO-DIM NO-DIM C249700600021 89.0 0.25 0.02 C249700600022 90.0 0.62 0.05 C249700600023 91.0 1.00 C249700600024 92.0 0.96 0.02 C249700600025 93.0 0.85 0.01 C249700600026 94.0 0.43 0.01 C249700600027 95.0 0.20 0.01 C249700600028 96.0 0.12 0.09 C249700600029 ENDDATA 10 0 C249700600030 ENDSUBENT 29 0 C249700699999 SUBENT C2497007 20200310 C192C249700700001 BIB 3 10 C249700700002 REACTION ((92-U-238(HE3,F)ELEM/MASS,IND,FY)/ C249700700003 (92-U-238(HE3,F)37-RB-91,IND,FY)) C249700700004 METHOD (MASSP) The measurement of Rb independent yields must C249700700005 be done in a time interval short compared to the C249700700006 radioactive half-lives of the Kr precursors. Thus a C249700700007 pulsed beam procedure was used in which mass spectra C249700700008 were recorded with "beam-on" for a short time C249700700009 interval and were separately recorded with "beam-off" C249700700010 for the same time interval. C249700700011 STATUS (TABLE) Table 3, page 790. C249700700012 ENDBIB 10 0 C249700700013 COMMON 3 3 C249700700014 EN +EN-ERR -EN-ERR C249700700015 MEV MEV MEV C249700700016 28.1 3.9 6.4 C249700700017 ENDCOMMON 3 0 C249700700018 DATA 3 9 C249700700019 MASS DATA DATA-ERR C249700700020 NO-DIM NO-DIM NO-DIM C249700700021 89.0 0.32 0.05 C249700700022 90.0 0.74 0.04 C249700700023 91.0 1.00 C249700700024 92.0 0.95 0.02 C249700700025 93.0 0.79 0.03 C249700700026 94.0 0.42 0.02 C249700700027 95.0 0.25 0.02 C249700700028 96.0 0.11 0.02 C249700700029 97.0 0.076 0.009 C249700700030 ENDDATA 11 0 C249700700031 ENDSUBENT 30 0 C249700799999 SUBENT C2497008 20200310 C192C249700800001 BIB 3 10 C249700800002 REACTION ((92-U-238(A,F)ELEM/MASS,IND,FY)/ C249700800003 (92-U-238(A,F)37-RB-92,IND,FY)) C249700800004 METHOD (MASSP) The measurement of Rb independent yields must C249700800005 be done in a time interval short compared to the C249700800006 radioactive half-lives of the Kr precursors. Thus a C249700800007 pulsed beam procedure was used in which mass spectra C249700800008 were recorded with "beam-on" for a short time C249700800009 interval and were separately recorded with "beam-off" C249700800010 for the same time interval. C249700800011 STATUS (TABLE) Table 3, page 790. C249700800012 ENDBIB 10 0 C249700800013 COMMON 3 3 C249700800014 EN +EN-ERR -EN-ERR C249700800015 MEV MEV MEV C249700800016 25.5 2.0 4.2 C249700800017 ENDCOMMON 3 0 C249700800018 DATA 3 6 C249700800019 MASS DATA DATA-ERR C249700800020 NO-DIM NO-DIM NO-DIM C249700800021 90.0 0.37 0.03 C249700800022 91.0 0.78 0.04 C249700800023 92.0 1.00 C249700800024 93.0 0.97 0.07 C249700800025 94.0 0.59 0.05 C249700800026 95.0 0.35 0.02 C249700800027 ENDDATA 8 0 C249700800028 ENDSUBENT 27 0 C249700899999 SUBENT C2497009 20200310 C192C249700900001 BIB 3 10 C249700900002 REACTION ((90-TH-232(HE3,F)ELEM/MASS,IND,FY)/ C249700900003 (90-TH-232(HE3,F)37-RB-91,IND,FY)) C249700900004 METHOD (MASSP) The measurement of Rb independent yields must C249700900005 be done in a time interval short compared to the C249700900006 radioactive half-lives of the Kr precursors. Thus a C249700900007 pulsed beam procedure was used in which mass spectra C249700900008 were recorded with "beam-on" for a short time C249700900009 interval and were separately recorded with "beam-off" C249700900010 for the same time interval. C249700900011 STATUS (TABLE) Table 3, page 790. C249700900012 ENDBIB 10 0 C249700900013 COMMON 3 3 C249700900014 EN +EN-ERR -EN-ERR C249700900015 MEV MEV MEV C249700900016 28.1 3.0 6.7 C249700900017 ENDCOMMON 3 0 C249700900018 DATA 3 7 C249700900019 MASS DATA DATA-ERR C249700900020 NO-DIM NO-DIM NO-DIM C249700900021 89.0 0.67 0.08 C249700900022 90.0 0.90 0.04 C249700900023 91.0 1.00 C249700900024 92.0 0.91 0.07 C249700900025 93.0 0.76 0.03 C249700900026 94.0 0.53 0.02 C249700900027 95.0 0.31 0.04 C249700900028 ENDDATA 9 0 C249700900029 ENDSUBENT 28 0 C249700999999 ENDENTRY 9 0 C249799999999