ENTRY 14525 20190329 14491452500000001 SUBENT 14525001 20190329 14491452500100001 BIB 11 28 1452500100002 TITLE Pile Neutron Capture Cross Section of 33 Hr. Ce143 1452500100003 AUTHOR (L.P.Roy,L.Yaffe) 1452500100004 REFERENCE (J,CJC,34,238,1956) 1452500100005 #doi:10.1139/v56-036 1452500100006 INSTITUTE (1CANMCG) 1452500100007 FACILITY (REAC,1CANCRC) The NRX nuclear reactor at Chalk River. 1452500100008 DETECTOR (GEMUC) The counter was the "end window" type with a 1452500100009 mica window of mass 2.3 mgm./cm2. 1452500100010 METHOD (ACTIV,CHSEP) Spectroscopically pure samples of 1452500100011 cerium oxide, sealed in small quartz ampoules, were 1452500100012 irradiated in the NRX nuclear reactor at different 1452500100013 neutron fluxes for different times. After irradiation, 1452500100014 the cerium oxide was removed from the quartz ampoule 1452500100015 and chemically separated. The final hydroxide 1452500100016 precipitate was transferred as a slurry to an 1452500100017 aluminum tray, where it was spread evenly, dried, and 1452500100018 the counting-rate determined by a Geiger-Miiller 1452500100019 counter. The pile neutron capture cross section of 1452500100020 the 33 hr. Ce143 was determined by separating Pr144, 1452500100021 the daughter of Ce144, from the rigorously-purified 1452500100022 cerium at frequent intervals. The amount of Pr144 1452500100023 formed increased linearly with the square of the 1452500100024 neutron flux in a manner consistent with that of a 1452500100025 successive neutron capture reaction. 1452500100026 MONITOR (58-CE-142(N,G)58-CE-143,,SIG) 1452500100027 MONIT-REF ((MONIT)12051001,L.P.Roy+,J,CJC,34,1023,1956) 1452500100028 DECAY-DATA (58-CE-143,33.0HR,B-) 1452500100029 HISTORY (20190329C) BP 1452500100030 ENDBIB 28 0 1452500100031 COMMON 2 3 1452500100032 MONIT EN-DUMMY 1452500100033 B EV 1452500100034 0.95 0.0253 1452500100035 ENDCOMMON 3 0 1452500100036 ENDSUBENT 35 0 1452500199999 SUBENT 14525002 20190329 14491452500200001 BIB 3 3 1452500200002 REACTION (58-CE-143(N,G)58-CE-144,,SIG,,SPA) 1452500200003 ERR-ANALYS (DATA-ERR) No information on sources of uncertainties. 1452500200004 STATUS (TABLE) page 243. 1452500200005 ENDBIB 3 0 1452500200006 NOCOMMON 0 0 1452500200007 DATA 2 1 1452500200008 DATA DATA-ERR 1452500200009 B B 1452500200010 6.0 0.7 1452500200011 ENDDATA 3 0 1452500200012 ENDSUBENT 11 0 1452500299999 ENDENTRY 2 0 1452599999999