ENTRY 30419 20090310 31353041900000001 SUBENT 30419001 20090310 31353041900100001 BIB 15 45 3041900100002 INSTITUTE (3BULBLA) 3041900100003 (2GERZFK) 1st author's address. 3041900100004 REFERENCE (J,IP,13,(5),183,197705) in German. 3041900100005 (J,IP,13,(1),15,197701) in German, experimental detail.3041900100006 AUTHOR (G.Pfrepper,D.Apostolov,C.Raitschev) 3041900100007 TITLE -Determination of cross-sections or Sr-88(n,p)Rb-88 3041900100008 with fission neutrons.- 3041900100009 FACILITY (REAC,3BULBLA) 3041900100010 Research reactor at Institut fuer Kernforshung u. Kern-3041900100011 energetik, Sofia. 3041900100012 INC-SOURCE (REAC) n-flux = 4.x 10**12 n/s/cm2. 3041900100013 INC-SPECT The ratio of thermal and fast component in the neutron 3041900100014 flux was determined to be '' 5.7 '' using the reaction 3041900100015 of S-32(n,p)P-32 ( = 69mb for fission neutrons) and 3041900100016 p-31(n,g)P-32 ( = 190mb for thermal neutrons) and 3041900100017 their Cd-ratios.(1 For S-32(n,p) and 68 for P-31(n,g)) 3041900100018 SAMPLE Sr-Co(3), 450 to 500 mg, together with Rb-NO(3) of 10 3041900100019 to 15 mg as the standard sample. 3041900100020 METHOD (CHSEP,MOMIX) 3041900100021 (n,g) reaction leading to the same residual nuclide 3041900100022 was used for comparison.(88Sr(n,p)88Rb, 87Rb(n,g)88Rb).3041900100023 After irradiation of the sample (Sr-CO(3)) and of the 3041900100024 standard (Rb-NO(3)),radio-chemical separation was per- 3041900100025 formed, and then 899 and 1837 keV gamma peaks from 3041900100026 Rb-88 were measured by Ge(Li) detector. 3041900100027 DETECTOR (GELI) 18 cm3 Ge(Li) detector. 3041900100028 ANALYSIS The cross-section of Sr-88(n,p)Rb-88 for fission- 3041900100029 neutrons, sig(S),is deduced from the following equation3041900100030 sig(S)=sig(t)*(F(t)/F(S))*(1/p)*(r/(r-1))*(1/r'), 3041900100031 where 3041900100032 sig(t)- (n,g) cross-section for 'thermal' neutrons, 3041900100033 F(t)/F(S)- flux ratio of thermal to fission neutrons,3041900100034 p- isotopic disturbing coef. Which can Be determined 3041900100035 in order to measure the relative activity of target 3041900100036 and standard, (to be found as 15.9) 3041900100037 r- cadmium ratio of (n,g) reaction (=3.84 Rb-87(n,g))3041900100038 r'- cadmium ratio of threshold reaction (= 1 for 3041900100039 Sr-88(n,p)Rb-88). 3041900100040 DECAY-DATA (37-RB-88,17.7MIN,DG,899.,,DG,1837.) 3041900100041 STATUS (APRVD) Approved by Pfrepper(through Seeliger,78/04/25)3041900100042 HISTORY (19771017C) KO. 3041900100043 (19790925U) KO.-'Aprvd' added. Monor correction in bib.3041900100044 (20090310A) SD:Updated to new date formats,lower case. 3041900100045 ERR-ANALYS (DATA-ERR) Standard deviation of the mean value of 3041900100046 16 different experimental run. 3041900100047 ENDBIB 45 0 3041900100048 NOCOMMON 0 0 3041900100049 ENDSUBENT 48 0 3041900199999 SUBENT 30419002 20090310 31353041900200001 BIB 4 9 3041900200002 REACTION (38-SR-88(N,P)37-RB-88,,SIG,,FIS) 3041900200003 MONITOR ((MONIT1)37-RB-87(N,G)37-RB-88,,SIG) = 120 mb, 3041900200004 Cd-ratio = 3.84. 3041900200005 ((MONIT2)16-S-32(N,P)15-P-32,,SIG,,FIS) = 69 mb, 3041900200006 ((MONIT3)15-P-31(N,G)15-P-32,,SIG) = 190 mb. 3041900200007 MONIT-REF ((MONIT1),R.SHER,R,IAEA-156,1,1974) 3041900200008 ((MONIT2),A.FABRY,R,BLG-465,1972) 3041900200009 ((MONIT3),R.SHER,R,IAEA-156,1,1974) 3041900200010 STATUS (TABLE) Data from Isotopenpraxis,13(1977)183. 3041900200011 ENDBIB 9 0 3041900200012 COMMON 5 3 3041900200013 EN-NRM1 EN-NRM3 MONIT1 MONIT2 MONIT3 3041900200014 EV EV MB MB MB 3041900200015 0.0253 0.0253 1.2000E+02 6.9000E+01 1.9000E+02 3041900200016 ENDCOMMON 3 0 3041900200017 DATA 3 1 3041900200018 EN-DUMMY DATA DATA-ERR 3041900200019 MEV MB MB 3041900200020 2.0000E+00 1.5500E-02 1.7000E-03 3041900200021 ENDDATA 3 0 3041900200022 ENDSUBENT 21 0 3041900299999 ENDENTRY 2 0 3041999999999