ENTRY C2474 20200220 C191C247400000001 SUBENT C2474001 20200220 C191C247400100001 BIB 9 25 C247400100002 TITLE Ratio of 85Kr isomers produced in medium energy fissionC247400100003 AUTHOR (J.A.McHugh,M.C.Michel) C247400100004 REFERENCE (J,JIN,30,673,1968) C247400100005 #doi:10.1016/0022-1902(68)80423-3 C247400100006 REL-REF (R,,I.Bergstrom+,J,PR,79,537,1950) 85Kr nuclear data. C247400100007 INSTITUTE (1USAUCX,1USABRK) C247400100008 FACILITY (CYCLO,1USABRK) C247400100009 METHOD (MASSP,STTA) After a cooling period of greater than C247400100010 two months, the foils were melted in a closed, C247400100011 evacuated system to release the rare gases. The rare C247400100012 gas fraction was purified and introduced to the C247400100013 spectrometer for a mass analysis in the static mode. C247400100014 The mass spectrometer was an ultra-high vacuum 6-in. C247400100015 radius, 60-deg-sector, single direction focusing C247400100016 instrument which employed an electron multiplier ion C247400100017 detector for high sensitivity. The Kr yields in these C247400100018 experiments were measured relative to the 84Kr chain C247400100019 yield. The 85Kr (ten-year) relative to 84Kr was C247400100020 corrected for any decay of the ten-year Kr. From the C247400100021 relative chain yields of 83Kr, 84Kr, and 86Kr, it is C247400100022 possible to derive the chain yield for 85Kr by C247400100023 interpolation. C247400100024 DECAY-DATA (36-KR-85-M,4.HR) C247400100025 (36-KR-85-G,10.YR) C247400100026 HISTORY (20200220C) BP C247400100027 ENDBIB 25 0 C247400100028 NOCOMMON 0 0 C247400100029 ENDSUBENT 28 0 C247400199999 SUBENT C2474002 20200220 C191C247400200001 BIB 4 5 C247400200002 REACTION (92-U-235(A,F)36-KR-85-G,CUM,FY,,FRC) C247400200003 SAMPLE (92-U-235,ENR=0.93) Stacked foil targets of 0.001 in. C247400200004 ERR-ANALYS (DATA-ERR,2.,3.) The uncertainty for each ratio value C247400200005 or datum point is in the range of 2-3 percent. C247400200006 STATUS (CURVE) Fig. 1a, page 675. C247400200007 ENDBIB 5 0 C247400200008 NOCOMMON 0 0 C247400200009 DATA 2 4 C247400200010 E-EXC-CMP DATA C247400200011 MEV NO-DIM C247400200012 22.700 0.264 C247400200013 28.468 0.285 C247400200014 32.664 0.301 C247400200015 38.235 0.321 C247400200016 ENDDATA 6 0 C247400200017 ENDSUBENT 16 0 C247400299999 SUBENT C2474003 20200220 C191C247400300001 BIB 4 5 C247400300002 REACTION (90-TH-232(A,F)36-KR-85-G,CUM,FY,,FRC) C247400300003 SAMPLE Stacked foil targets of 0.001 in. C247400300004 ERR-ANALYS (DATA-ERR,2.,3.) The uncertainty for each ratio value C247400300005 or datum point is in the range of 2-3 percent. C247400300006 STATUS (CURVE) Fig. 1a, page 675. C247400300007 ENDBIB 5 0 C247400300008 NOCOMMON 0 0 C247400300009 DATA 2 8 C247400300010 E-EXC-CMP DATA C247400300011 MEV NO-DIM C247400300012 23.145 0.220 C247400300013 28.517 0.230 C247400300014 31.072 0.236 C247400300015 33.102 0.237 C247400300016 35.068 0.242 C247400300017 37.099 0.249 C247400300018 43.453 0.260 C247400300019 56.818 0.289 C247400300020 ENDDATA 10 0 C247400300021 ENDSUBENT 20 0 C247400399999 SUBENT C2474004 20200220 C191C247400400001 BIB 3 12 C247400400002 REACTION (92-U-235(A,F)36-KR-85-G,IND,FY,,FRC) C247400400003 ANALYSIS In order to derive information concerning the C247400400004 independent production of Kr isomers, we calculate C247400400005 the quantity sigmag/(sigmag+sigmam) from the C247400400006 independent fractional chain yield of 85Kr and the C247400400007 fraction (f) of the mass-85 chain which directly C247400400008 populates the 9/2 state: f=(R - b)/(1 - b) , where b C247400400009 is the branching from the spin 1/2 state (0.219) and C247400400010 R is the ratio of 85Kr (ten-year) to mass-85 chain C247400400011 yield. C247400400012 STATUS (DEP,C2474002) C247400400013 (CURVE) Fig. 1b, page 675. C247400400014 ENDBIB 12 0 C247400400015 NOCOMMON 0 0 C247400400016 DATA 2 4 C247400400017 E-EXC-CMP DATA C247400400018 MEV NO-DIM C247400400019 22.636 0.057 C247400400020 28.406 0.084 C247400400021 32.604 0.107 C247400400022 38.241 0.130 C247400400023 ENDDATA 6 0 C247400400024 ENDSUBENT 23 0 C247400499999 SUBENT C2474005 20200220 C191C247400500001 BIB 3 12 C247400500002 REACTION (90-TH-232(A,F)36-KR-85-G,IND,FY,,FRC) C247400500003 ANALYSIS In order to derive information concerning the C247400500004 independent production of Kr isomers, we calculate C247400500005 the quantity sigmag/(sigmag+sigmam) from the C247400500006 independent fractional chain yield of 85Kr and the C247400500007 fraction (f) of the mass-85 chain which directly C247400500008 populates the 9/2 state: f=(R - b)/(1 - b) , where b C247400500009 is the branching from the spin 1/2 state (0.219) and C247400500010 R is the ratio of 85Kr (ten-year) to mass-85 chain C247400500011 yield. C247400500012 STATUS (DEP,C2474003) C247400500013 (CURVE) Fig. 1b, page 675. C247400500014 ENDBIB 12 0 C247400500015 NOCOMMON 0 0 C247400500016 DATA 2 8 C247400500017 E-EXC-CMP DATA C247400500018 MEV NO-DIM C247400500019 23.142 0.000 C247400500020 28.712 0.014 C247400500021 31.071 0.022 C247400500022 33.101 0.023 C247400500023 35.001 0.029 C247400500024 37.099 0.039 C247400500025 43.520 0.053 C247400500026 56.756 0.090 C247400500027 ENDDATA 10 0 C247400500028 ENDSUBENT 27 0 C247400599999 ENDENTRY 5 0 C247499999999