ENTRY 30189 20080208 31263018900000001 SUBENT 30189001 20080208 31263018900100001 BIB 16 46 3018900100002 TITLE Neutron activation resonance integral of Ge-74 and 3018900100003 Ge-76 and evaluation of the Ge-74 keV neutron radiative3018900100004 capture cross section and resonance integral 3018900100005 AUTHOR (M.D.Ricabarra,R.Turjanski,G.H.Ricabarra) 3018900100006 INSTITUTE (3ARGCNE) 3018900100007 EXP-YEAR (1972) 3018900100008 REFERENCE (J,CJP,50,1978,1972) Full descr.,ratio to thr-act sigm.3018900100009 (P,INDC(SEC)-28,2,197209) Abstract,same values 3018900100010 (P,INDC(SEC)-18,4,197108) Short note,no data 3018900100011 (C,70HELSINKI,2,589,197006) Preliminary values 3018900100012 (P,INDC(ARG)-2,1972) Reprint of Can. J. of Phys.50,19783018900100013 (P,INDC(ARG)-3,197206) Brief description. Same results 3018900100014 as Can. J. of Phys. 50, 1978. 3018900100015 SAMPLE Foils of metallic germanium 406 millig/cm2 thick and 3018900100016 thin foils of 25 millig/cm2 or 40 millig/cm2 of 3018900100017 germanium oxide deposited in plastic paper 3018900100018 MONITOR Ratios of reduced capture resonance integral to thermal3018900100019 cross section determined relative to gold,with a gold- 3018900100020 cadmium ratio of 1.674+-0.003 and a value of the ratio 3018900100021 of resonance integral to thermal cross section of gold 3018900100022 of 15.69 3018900100023 FACILITY (REAC) 3018900100024 INC-SOURCE Central graphite reflector of reactor RA-1 3018900100025 METHOD The cadmium ratio technique was applied to determine 3018900100026 the ratio of the reduced resonance integral (I),to the 3018900100027 thermal capture cross section. 3018900100028 DETECTOR (GELI) Li-drifted Ge gamma ray spectrometer 3018900100029 ANALYSIS The infinite-dilution resonance integral was obtained 3018900100030 by extrapolating the experimental values of IXG(R) to 3018900100031 zero thickness using the calculated resonance self- 3018900100032 shielding correction factor, G(R),as a parameter 3018900100033 CORRECTION Self-shielding correction,G(R),was calculated for every3018900100034 resonance using the parameters of Maletzki et al.(Energ3018900100035 AT 24 80 1968) and the narrow resonance approximation. 3018900100036 Experimental determination of resonance self-shielding 3018900100037 was made by measuring the cadmium ratio for two 3018900100038 different sample thicknesses 3018900100039 ERR-ANALYS (ERR-1) Systematic error 1% in the case where 3018900100040 there is serious disagreement between calculated and 3018900100041 experimental values of self-shielding. 3018900100042 STATUS (APRVD) G.Ricabarra 22 March 1973 3018900100043 HISTORY (19721212C) 3018900100044 (19880525A) TMK. Two refs added. Coding of iso-quant an3018900100045 standard changed into reaction and monitor 3018900100046 (19890313A) VOF.-Monitor code corrected in sub 2 and 3.3018900100047 (20080208A) BIB section updated 3018900100048 ENDBIB 46 0 3018900100049 COMMON 3 3 3018900100050 EN-MIN EN-NRM ERR-1 3018900100051 EV EV PER-CENT 3018900100052 0.6 0.0253 1.0 3018900100053 ENDCOMMON 3 0 3018900100054 ENDSUBENT 53 0 3018900199999 SUBENT 30189002 20080208 31263018900200001 BIB 5 20 3018900200002 REACTION 1((32-GE-74(N,G)32-GE-75,,RI)/ 3018900200003 (32-GE-74(N,G)32-GE-75,,SIG)) 3018900200004 2(32-GE-74(N,G)32-GE-75,,RI) 3018900200005 Infinite dilution reduced resonance integral and ratio 3018900200006 to thermal capture cross section 3018900200007 MONITOR 2(32-GE-74(N,G)32-GE-75,,SIG) At energy Eo=0.025 eV 3018900200008 value taken from Goldberg et al. (BNL-325 2nd ed. 3018900200009 suppl. 2. 1966) 3018900200010 METHOD The 190 keV gamma ray of Ge-75 (82 min) was measured 3018900200011 about 1 hour after irradiation to allow for decaying 3018900200012 the 48 sec isomer. 3018900200013 COMMENT The resonance integral value is about three times 3018900200014 larger than the calculated one. If one assumes that 3018900200015 this discrepancy is due to a nonshielded contribution 3018900200016 to the resonance integral a better agreement with the 3018900200017 experimental value is obtained. 3018900200018 Analysis is made of the influence of s-,p- and d-wave 3018900200019 neutron resonances on the calculated resonance integral3018900200020 value. 3018900200021 HISTORY (19900226A) VOF.- Data headings corrected 3018900200022 ENDBIB 20 0 3018900200023 NOCOMMON 0 0 3018900200024 DATA 6 1 3018900200025 DATA 1DATA-ERR 1MONIT MONIT-ERR DATA 2DATA-ERR 23018900200026 NO-DIM NO-DIM B B B B 3018900200027 1.514 0.031 0.45 0.08 0.681 0.123 3018900200028 ENDDATA 3 0 3018900200029 ENDSUBENT 28 0 3018900299999 SUBENT 30189003 20080208 31263018900300001 BIB 4 17 3018900300002 REACTION 1((32-GE-76(N,G)32-GE-77,,RI)/ 3018900300003 (32-GE-76(N,G)32-GE-77,,SIG)) 3018900300004 2(32-GE-76(N,G)32-GE-77,,RI) 3018900300005 MONITOR 2(32-GE-76(N,G)32-GE-77,,SIG) At energy Eo=0.025 eV 3018900300006 value obtained from the thermal cross-section for the 3018900300007 isomeric state of Ge-77-ms(54sec) recommended by 3018900300008 Goldberg et al. BNL-324 2nd ed. Suppl. 2. 1966 and the 3018900300009 thermal isomeric yield ratio of Mannhart and Vonach, 3018900300010 Z. Phys. 210 13 1968 3018900300011 METHOD Since the metastable isomer Ge-77-ms (54 sec) produced 3018900300012 by neutron capture decays partially (24%) to the 3018900300013 ground state Ge-77 and 76% of it to As-77,the 3018900300014 cadmium ratio was deduced from the activities of these 3018900300015 two isotopes,by measuring the 210,215,and 263 keV 3018900300016 photopeaks of Ge-77 (11.3 H) and the 239 keV gamma ray 3018900300017 of As-77 (38.7 H) 3018900300018 COMMENT Calculated and experimental values disagree seriously. 3018900300019 ENDBIB 17 0 3018900300020 NOCOMMON 0 0 3018900300021 DATA 6 1 3018900300022 DATA 1DATA-ERR 1MONIT MONIT-ERR DATA 2DATA-ERR 23018900300023 NO-DIM NO-DIM B B B B 3018900300024 12.00 0.16 0.166 0.030 1.992 0.359 3018900300025 ENDDATA 3 0 3018900300026 ENDSUBENT 25 0 3018900399999 ENDENTRY 3 0 3018999999999