ENTRY 14733 20220118 14961473300000001
SUBENT 14733001 20220118 14961473300100001
BIB 9 17 1473300100002
TITLE The ratio of the fission cross sections of 49 and 25 1473300100003
for thermal neutrons and the ration [1+alpha(49)]/ 1473300100004
[1+alpha(25)] 1473300100005
AUTHOR (J.W.Dewire,R.R.Wilson,W.D.Woodward) 1473300100006
REFERENCE (R,LA-103,1944) 1473300100007
REL-REF (R,14734001,E.E.Anderson+,S,LA-91,1944) 239Pu 1473300100008
absorption cross section. 1473300100009
INSTITUTE (1USALAS) 1473300100010
FACILITY (CYCLO,1USALAS) 1473300100011
INC-SOURCE (D-BE) A thermalized neutron flux of about 2*10**5 1473300100012
neutrons/cm2/sec at the center of the 11'*7'*6'8" 1473300100013
graphite block at the cyclotron. 1473300100014
DETECTOR (IOCH) The comparison chamber consisted of two 1473300100015
parallel plate ionization chambers having a common 1473300100016
high voltage electrode, on which the samples were 1473300100017
placed. 1473300100018
HISTORY (20220118C) BP 1473300100019
ENDBIB 17 0 1473300100020
COMMON 1 3 1473300100021
EN-DUMMY 1473300100022
EV 1473300100023
0.0253 1473300100024
ENDCOMMON 3 0 1473300100025
ENDSUBENT 24 0 1473300199999
SUBENT 14733002 20220118 14961473300200001
BIB 5 14 1473300200002
REACTION ((94-PU-239(N,F),,SIG,,SPA)/(92-U-235(N,F),,SIG,,SPA)) 1473300200003
SAMPLE Six foils of 235U and four foils of 239Pu were used 1473300200004
in the experiment. All the foils were deposited on 1 1473300200005
or 2 mil Pt. All the weights are based on a half life 1473300200006
for 239Pu of 24,400 years. 1473300200007
ERR-ANALYS (DATA-ERR) In order to find any systematic errors in 1473300200008
counting, a 239Pu foil and a 235U foil were compared 1473300200009
under conditions obtained by separately interchanging 1473300200010
scalars, amplifiers, and foils, and by moving the 1473300200011
chamber within the block. No significant change in 1473300200012
the counting ratio were detected. No further details 1473300200013
on how the given uncertainty was determined. 1473300200014
DECAY-DATA (94-PU-239,24400.YR) 1473300200015
STATUS (TABLE) page 5. 1473300200016
ENDBIB 14 0 1473300200017
NOCOMMON 0 0 1473300200018
DATA 2 1 1473300200019
DATA DATA-ERR 1473300200020
NO-DIM NO-DIM 1473300200021
1.40 0.02 1473300200022
ENDDATA 3 0 1473300200023
ENDSUBENT 22 0 1473300299999
SUBENT 14733003 20220118 14961473300300001
BIB 4 10 1473300300002
REACTION (((94-PU-239(N,ABS),,SIG,,SPA)/ 1473300300003
(92-U-235(N,ABS),,SIG,,SPA))/ 1473300300004
((94-PU-239(N,F),,SIG,,SPA)/(92-U-235(N,F),,SIG,,SPA)))1473300300005
ANALYSIS The following relation was used: [1+alpha(239Pu)]/ 1473300300006
[1+alpha(235U)] = ((sigma abs(239Pu)/sigma abs(235U))/ 1473300300007
(sigmaf(235U)/sigmaf(239Pu))). 1473300300008
ASSUMED (ASSUM1,94-PU-239(N,ABS),,SIG) 1473300300009
(ASSUM2,92-U-235(N,ABS),,SIG) 1473300300010
STATUS (DEP,14733002) 1473300300011
(TABLE) page 7. 1473300300012
ENDBIB 10 0 1473300300013
NOCOMMON 0 0 1473300300014
DATA 3 1 1473300300015
DATA ASSUM1 ASSUM2 1473300300016
NO-DIM B B 1473300300017
1.29 1056.0 640.0 1473300300018
ENDDATA 3 0 1473300300019
ENDSUBENT 18 0 1473300399999
ENDENTRY 3 0 1473399999999