ENTRY 13371 20220624 150313371 0 1 SUBENT 13371001 20220624 150313371 1 1 BIB 12 42 13371 1 2 TITLE Yield of Xe133 in the thermal neutron fission of U235 13371 1 3 AUTHOR (S.Katcoff,W.Rubinson) 13371 1 4 REFERENCE (J,PR,91,1458,1953) 13371 1 5 #doi:10.1103/physrev.91.1458 13371 1 6 (R,BNL-1652,1953) Preliminary results. 13371 1 7 REL-REF (O,13426001,S.Katcoff+,R,BNL-1652,1953) 85Kr and 133Xe.13371 1 8 INSTITUTE (1USABNL) 13371 1 9 FACILITY (REAC,1USABNL) Brookhaven pile. 13371 1 10 INC-SPECT A constant (+-2%) flux of ~2x10**11 neutrons/cm2/sec. 13371 1 11 SAMPLE (92-U-235,ENR=0.9372) Five fission foils, each 13371 1 12 containing 7.855x10**-3 microg of 93.72 percent U235, 13371 1 13 were prepared by the standard method. Two additional 13371 1 14 foils were prepared by slight variations of this 13371 1 15 method: one, without final ignition, to test whether 13371 1 16 ignition affects the escape of fission recoils; and the13371 1 17 other, by stippling the foil solution and rinse in 13371 1 18 small droplets over the surface of the Pt before 13371 1 19 evaporation and ignition, to test whether possible 13371 1 20 clumping of the U was great enough to cause loss of 13371 1 21 fission recoils. 13371 1 22 DETECTOR (PROPC,FISCH) The gas counters were of glass, 2 cm in 13371 1 23 diameter and 30 cm long, with chemically deposited 13371 1 24 silver cathodes whose volumes had been measured to 13371 1 25 within 0.2 percent. 13371 1 26 METHOD (CHSEP,INTB) Two slug solutions were prepared 13371 1 27 independently of each other by diluting aliquots of 13371 1 28 the U235 stock solution. The slug was bombarded in 13371 1 29 the space between the two fission foils for an hour. 13371 1 30 The total of the recorded fissions of each foil was 13371 1 31 then corrected for background and counting-rate loss, 13371 1 32 divided by 60 to give the foil fission rate as 13371 1 33 fissions per min, and multiplied by the ratio of 13371 1 34 slug weight to foil weight to give the slug fission 13371 1 35 rate. 13371 1 36 COMMENT Surprisingly, modern T1/2 values for 133Xe and 135Xe 13371 1 37 are 5.2475 d and 9.14 H, respectively. Almost no 13371 1 38 changes in the last 65 years. 13371 1 39 HISTORY (19891211C) VM 13371 1 40 (20180312A) BP: updated to new date formats, lower 13371 1 41 case. corrections according last EXFOR rules and 13371 1 42 dict., added doi and minor updates. 13371 1 43 (20220624A) BP: Added preliminary reference, REL-REF. 13371 1 44 ENDBIB 42 0 13371 1 45 COMMON 1 3 13371 1 46 EN-DUMMY 13371 1 47 EV 13371 1 48 0.0253 13371 1 49 ENDCOMMON 3 0 13371 1 50 ENDSUBENT 49 0 13371 199999 SUBENT 13371002 20180312 143913371 2 1 BIB 6 19 13371 2 2 REACTION ((92-U-235(N,F)ELEM/MASS,IND,FY,,MXW)/ 13371 2 3 (92-U-235(N,F)MASS,CHN,FY)) 13371 2 4 METHOD (RELFY) In our experimental procedure two identical 13371 2 5 uranium samples(~40 microg U235 in each) were sealed 13371 2 6 into the usual quartz cells and then irradiated side 13371 2 7 by side in one of the pile pneumatic tubes for 0.033 13371 2 8 hr. The slugs were dissolved and swept with Xe 13371 2 9 carrier and 2 l of helium as rapidly as possible. The 13371 2 10 Xe of extract a collected at the bottom of the 13371 2 11 charcoal column was probably contaminated with some 13371 2 12 short-lived Kr isotopes. Therefore the first 10-15 13371 2 13 percent of the Xe desorbed from the column was 13371 2 14 discarded. The remainder was collected and put into 13371 2 15 counters in the usual manner. 13371 2 16 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. 13371 2 17 RESULT (FRIND) 13371 2 18 DECAY-DATA ((1.)54-XE-133-G,5.27D) 13371 2 19 ((2.)54-XE-135-G,9.15HR) 13371 2 20 STATUS (TABLE) Abstract and page 1467. 13371 2 21 ENDBIB 19 0 13371 2 22 NOCOMMON 0 0 13371 2 23 DATA 6 2 13371 2 24 MASS ELEMENT DATA DATA-ERR DATA-MAX DECAY-FLAG 13371 2 25 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 13371 2 26 133. 54. 0.001 1.13371 2 27 135. 54. 0.035 0.010 2.13371 2 28 ENDDATA 4 0 13371 2 29 ENDSUBENT 28 0 13371 299999 SUBENT 13371003 20180312 143913371 3 1 BIB 6 20 13371 3 2 REACTION (92-U-235(N,F)54-XE-133,CUM,FY,,MXW) 13371 3 3 METHOD (BSPEC) The Xe from each run was measured into two 13371 3 4 counters, designated a and b, each of which was 13371 3 5 counted ten times, over a period of two weeks, 13371 3 6 starting about 10 days after irradiation, on each of 13371 3 7 two electronic circuits, designated 1 and 2. Eight 13371 3 8 different counters were used for the five runs. 13371 3 9 ANALYSIS The basic Xe activity datum that enters the fission 13371 3 10 yield calculation in a given run is the mean of the 13371 3 11 corrected a and b averages of that run. This gives 13371 3 12 the disintegration rate of the total Xe in the given 13371 3 13 slug 253 hr after the end of a 1-hr bombardment. Of 13371 3 14 this total activity, about 98.8 percent was 5.27-day 13371 3 15 Xe133, one percent was 2.3-day Xe133m, and the 13371 3 16 remaining 0.2 percent was 12.0-day Xe131m. 13371 3 17 ERR-ANALYS (DATA-ERR) Probable error. 13371 3 18 (ERR-1) 1% Slug fission rate. 13371 3 19 (ERR-2) 2% Xe disintegration rates. 13371 3 20 DECAY-DATA (54-XE-133-G,5.27D) 13371 3 21 STATUS (TABLE) Abstract and page 1466. 13371 3 22 ENDBIB 20 0 13371 3 23 COMMON 2 3 13371 3 24 ERR-1 ERR-2 13371 3 25 PER-CENT PER-CENT 13371 3 26 1.0 2.0 13371 3 27 ENDCOMMON 3 0 13371 3 28 DATA 2 1 13371 3 29 DATA DATA-ERR 13371 3 30 PC/FIS PC/FIS 13371 3 31 6.62 0.15 13371 3 32 ENDDATA 3 0 13371 3 33 ENDSUBENT 32 0 13371 399999 ENDENTRY 3 0 1337199999999