ENTRY 23350 20201211 229623350 0 1 SUBENT 23350001 20201211 229623350 1 1 BIB 11 21 23350 1 2 TITLE Delayed neutron precursors-III Selenium-87 23350 1 3 AUTHOR (L.Tomlinson, M.H.Hurdus) 23350 1 4 REFERENCE (J,JIN,30,1995,1968) 23350 1 5 INSTITUTE (2UK HAR) AERE,Harwell,Didcot,Berkshire 23350 1 6 REL-REF (M,23351001,L.Tomlinson+,J,JIN,30,1125,1968) 23350 1 7 Method of irradiation. 23350 1 8 FACILITY (REAC,2UK HAR) 23350 1 9 INC-SOURCE (REAC) 23350 1 10 METHOD (CHSEP) Separation of Se fission product base of the 23350 1 11 formation of H(2)Se. 23350 1 12 Delay experiments: 23350 1 13 Delay before Se separation, sec 0 5.0 10. 18.1 23350 1 14 Residual neutron flux,% of max. 8 0.2 0.0002 0.003 23350 1 15 Se chemical yield, 0.73 0.35 0.52 0.56 23350 1 16 HL,sec 54.2 49.9 52.0 60.5 23350 1 17 +- standard deviation, sec 1.2 4.5 2.0 3.8 23350 1 18 DETECTOR No information about neutron detector in 23350 1 19 J.Inorg.Nucl.Chem.,30,1995,1968 23350 1 20 ANALYSIS (DECAY) Neutron decay curve analyzed. 23350 1 21 HISTORY (20171031C) M.M. 23350 1 22 (20201211U) SD: Correction in Subent 002. 23350 1 23 ENDBIB 21 0 23350 1 24 NOCOMMON 0 0 23350 1 25 ENDSUBENT 24 0 23350 199999 SUBENT 23350002 20201211 229623350 2 1 BIB 8 17 23350 2 2 REACTION (92-U-235(N,F)34-SE-87,CUM,FY,,SPA) 23350 2 3 DECAY-DATA (34-SE-87,5.8SEC) 5.8+-0.5 sec measured HL 23350 2 4 (35-BR-87,55.SEC,DN,,0.028) 23350 2 5 Weighted mean of two exp.values of Herrmann 23350 2 6 RAD-DET (35-BR-87,DN) 23350 2 7 REL-REF (R,22571001,G.Herrmann,C,67VIENNA,,147,1967) 23350 2 8 Neutron branching ratio for Br-87 - 2.8+-0.4% . 23350 2 9 (A,,L.E.Weaver+,R,USNRDL-TR-633,1963) 23350 2 10 Theoretical cumulative yield 1.09% . 23350 2 11 ANALYSIS The cumulative fission yield of Se-87 was calculated 23350 2 12 from the measured neutron activity of Br-87, grown 23350 2 13 in from Se-87. 23350 2 14 ERR-ANALYS (DATA-ERR) Standard deviation 23350 2 15 Mid-separation time error +-0.5sec. 23350 2 16 STATUS (TABLE) Text, p.2000 of J.Inorg.Nucl.Chem.,30,1995,196823350 2 17 HISTORY (20201211U) SD: DECAY-DATA corrected (missed comma 23350 2 18 before intensity added). 23350 2 19 ENDBIB 17 0 23350 2 20 COMMON 1 3 23350 2 21 EN-DUMMY 23350 2 22 EV 23350 2 23 0.0253 23350 2 24 ENDCOMMON 3 0 23350 2 25 DATA 2 1 23350 2 26 DATA DATA-ERR 23350 2 27 PC/FIS PC/FIS 23350 2 28 1.17 0.24 23350 2 29 ENDDATA 3 0 23350 2 30 ENDSUBENT 29 0 23350 299999 SUBENT 23350003 20171031 226823350 3 1 BIB 5 11 23350 3 2 REACTION (34-SE-87(0,B-)35-BR-87,,PN) 23350 3 3 DECAY-DATA (34-SE-87,5.8SEC) 5.8+-0.5 sec measured HL 23350 3 4 ANALYSIS -Pn was calculated using half-life and fission yield, 23350 3 5 assuming that all of short-lived activity is due to 23350 3 6 Se-87 to be < 1.5 %. 23350 3 7 -Pn was calculated from the shape of the neutron decay 23350 3 8 curve using half-lives for Se-87 and Br-87 and Pn for 23350 3 9 Br-87 and measured neutron activities . This value is 23350 3 10 more accurate. 23350 3 11 ASSUMED (ASSUM,35-BR-87(0,B-)36-KR-87,,PN) 2.8 % 23350 3 12 STATUS (TABLE) Text, p.2002 of J.Inorg.Nucl.Chem.,30,1995,196823350 3 13 ENDBIB 11 0 23350 3 14 NOCOMMON 0 0 23350 3 15 DATA 2 1 23350 3 16 DATA-MAX ASSUM 23350 3 17 NO-DIM NO-DIM 23350 3 18 0.008 0.028 23350 3 19 ENDDATA 3 0 23350 3 20 ENDSUBENT 19 0 23350 399999 SUBENT 23350004 20171031 226823350 4 1 BIB 4 8 23350 4 2 REACTION (92-U-235(N,F)34-SE-87,DL/CUM,NU,,SPA) 23350 4 3 Absolute delayed neutron yield from Se-87 23350 4 4 DECAY-DATA (34-SE-87,5.8SEC) 5.8+-0.5 sec measured HL 23350 4 5 ANALYSIS Calculated as measured Se-87 cumulative yield 23350 4 6 multiplied by measured Pn value. 23350 4 7 STATUS (TABLE) Text, p.2002 of J.Inorg.Nucl.Chem.,30,1995,196823350 4 8 (DEP,23350003) Pn value. 23350 4 9 (DEP,23350002) Se-87 cumulative fission yield 23350 4 10 ENDBIB 8 0 23350 4 11 COMMON 1 3 23350 4 12 EN-DUMMY 23350 4 13 EV 23350 4 14 0.0253 23350 4 15 ENDCOMMON 3 0 23350 4 16 DATA 1 1 23350 4 17 DATA-MAX 23350 4 18 PC/FIS 23350 4 19 1.0E-2 23350 4 20 ENDDATA 3 0 23350 4 21 ENDSUBENT 20 0 23350 499999 ENDENTRY 4 0 2335099999999