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