ENTRY 30379 20090104 31343037900000001 SUBENT 30379001 20090104 31343037900100001 BIB 12 27 3037900100002 INSTITUTE (3BULBLA) 3037900100003 (2GERZFK) 1st author's address. 3037900100004 REFERENCE (J,RCA,23,(1),55,1976) Full report (in German) 3037900100005 AUTHOR (G.Pfrepper,C.Raitschev,M.Michailow) 3037900100006 TITLE -Contribution to determination of Br-81(n,p)Se-81m 3037900100007 reaction cross-section for fission neutrons.- 3037900100008 FACILITY (REAC,3BULBLA) 3037900100009 INC-SOURCE (REAC) IRT-1000 research reactor at Institut fuer Kern-3037900100010 Forschung u.Kernenegetik, Sofia. 3037900100011 N-flux=6.x 10**12 n/s/cm2 3037900100012 INC-SPECT The ratio of thermal and fission component in neutron 3037900100013 flux was determined to be '5.4', using the reactions of3037900100014 S-32(n,p)P-32 (=69mb for fission neutron),and P-31(n,g)3037900100015 P-32 (=190mb for thermal neutron) and their Cd-ratios. 3037900100016 SAMPLE NH(4)-Br, natural sample. 200 to 250 mg. 3037900100017 METHOD (CHSEP,ACTIV) 3037900100018 The sample of NH(4)-Br was irradiated with 10 to 12 mg 3037900100019 Se-O(2) in 2 hours. With radiochemical technique, 3037900100020 Br-isotopes (Br-80m, Br-80, Br-82m and Br-82) were 3037900100021 separated from Se-81m activity(t(1/2)=57min). 3037900100022 103keV gamma from Se-181m was measured by Ge(Li). 3037900100023 DETECTOR (GELI) 10 cm3 Ge(Li) detector with Didac 4000 multi- 3037900100024 channel analyzer. 3037900100025 HISTORY (19770210C) KO. 3037900100026 (20090115A) BIB section updated 3037900100027 ERR-ANALYS (DATA-ERR) Standard deviation of the mean value from 3037900100028 5 exp. runs. 3037900100029 ENDBIB 27 0 3037900100030 NOCOMMON 0 0 3037900100031 ENDSUBENT 30 0 3037900199999 SUBENT 30379002 20090104 31343037900200001 BIB 7 17 3037900200002 REACTION (35-BR-81(N,P)34-SE-81-M,,SIG,,FIS) 3037900200003 DECAY-DATA (34-SE-81-M,57.MIN,DG,103.) 3037900200004 ANALYSIS For detail, see G.Perepper,'Isotopenpraxis'(in prep., 3037900200005 May 1976). 3037900200006 Cadmium ratios for Se-80(n,g)Se-81m and for Br-81(n,p)3037900200007 Se-81m were determined to be 19.1 and 1, respectively. 3037900200008 MONITOR (34-SE-80(N,G)34-SE-81-M,,SIG,,MXW) 3037900200009 MONIT-REF (,R.Sher,R,IAEA-156,1,1974) 3037900200010 ASSUMED (ASSUM1,16-S-32(N,P)15-P-32,,SIG,,FIS) 3037900200011 From A.Calamand, report IAEA-156, p.273 (1974) 3037900200012 (ASSUM2,15-P-31(N,G)15-P-32,,SIG) 3037900200013 From R.Sher, report IAEA-156, p.1 (1974) 3037900200014 .S-32(n,p)P-32 and P-31(n,g)P-32 reactions for 3037900200015 measurement of flux ratio of thermal and fission 3037900200016 neutrons. 3037900200017 STATUS (TABLE) data taken from Table 1 of 3037900200018 Radiochim.Acta,23(1976)55. 3037900200019 ENDBIB 17 0 3037900200020 COMMON 3 3 3037900200021 MONIT ASSUM1 ASSUM2 3037900200022 MB MB MB 3037900200023 8.0000E+01 6.9000E+01 1.9000E+02 3037900200024 ENDCOMMON 3 0 3037900200025 DATA 3 1 3037900200026 EN-DUMMY DATA DATA-ERR 3037900200027 MEV MB MB 3037900200028 2.0000E+00 8.5600E-02 5.4000E-03 3037900200029 ENDDATA 3 0 3037900200030 ENDSUBENT 29 0 3037900299999 ENDENTRY 2 0 3037999999999