ENTRY 22100 19881216 00002210000000001 SUBENT 22100001 19881216 00002210000100001 BIB 15 50 2210000100002 REFERENCE (J,JP/G,14,77,8801) 2210000100003 TITLE -SILVER CROSS SECTIONS FOR 14 MEV NEUTRONS. 2210000100004 AUTHOR (T.B.RYVES,P.KOLKOWSKI,V.E.LEWIS) 2210000100005 INSTITUTE (2UK NPL) 2210000100006 FACILITY .NPL SAMES ACCELERATOR. ANALYSED BEAM OF 150 KEV 2210000100007 DEUTERONS. 2210000100008 INC-SOURCE (D-T) AN AIR-COOLED TI-T TARGET OF THICKNESS 2 MG/CM2 2210000100009 TITANIUM, EVAPORATED ONTO A 0.5 MM THICK VERY PURE 2210000100010 ALUMINIUM BACKING, WAS USED TO PRODUCE NEUTRONS OF 2210000100011 ABOUT 14 MEV ENERGY. 2210000100012 INC-SPECT .IN SOME IRRADIATIONS THE SAMPLE WAS PLACED IN CONTACT 2210000100013 WITH THE TARGET, RESULTING IN A SKEW NEUTRON ENERGY 2210000100014 DISTRIBUTION RANGING FROM 14.0 TO 14.8 MEV, WITH A 2210000100015 MEAN ENERGY OF 14.3 MEV. IN OTHER IRRADIATIONS THE 2210000100016 SAMPLE WAS PLACED AT A DISTANCE OF 50 MM IN FRONT OF 2210000100017 THE TARGET, GIVING A DISTRIBUTION FROM 14.5 TO 14.8 2210000100018 MEV WITH A MEAN OF 14.67 MEV. 2210000100019 METHOD (ACTIV) IRRADIATIONS WERE PERFORMED FROM 4 MIN TO 2 2210000100020 HOURS. 2210000100021 DETECTOR (PROPC) A 4-PI-BETA GAS-FLOW PROPORTIONAL COUNTER, 2210000100022 EMPLOYING PURE METHANE GAS, WAS USED FOR BETA ACTIVITY2210000100023 MEASUREMENTS. THE COUNTING EFFICIENCIES WERE 2210000100024 CALCULATED. 2210000100025 (GELI) A 40 CM3 COAXIAL GE(LI) DETECTOR WAS USED TO 2210000100026 MEASURE THE POSITRON ANNIHILATION RADIATION FROM 2210000100027 AG-106-G. THE EFFICIENCY OF THIS DETECTOR WAS DETER- 2210000100028 MINED WITH A CALIBRATED NA-22 SOURCE. 2210000100029 (LONGC) A LONGCOUNTER WAS USED TO MONITOR THE NEUTRON 2210000100030 FLUENCE RATE. 2210000100031 MONITOR (26-FE-56(N,P)25-MN-56,,SIG) 2210000100032 SAMPLE .THE SAMPLES CONSISTED OF NATURAL SILVER WITH ISOTOPIC 2210000100033 COMPOSITION 51.83 PERCENT AG-107 AND 48.17 PERCENT 2210000100034 AG-109. THEY WERE SHAPED AS DISCS WITH THICKNESSES 2210000100035 VARYING FROM 3 TO 85 MG/CM2 AND DIAMETERS OF 22.0 OR 2210000100036 25.4 MM. FOR ABSOLUTE MEASUREMENTS THE SILVER FOIL WAS2210000100037 SANDWICHED BETWEEN TWO IRON FOILS OF EQUAL DIAMETER. 2210000100038 BOTH METALS HAD A CHEMICAL PURITY OF BETTER THAN 2210000100039 99.99 PERCENT. 2210000100040 CORRECTION .THE DATA WERE CORRECTED FOR TIME VARIATIONS OF THE 2210000100041 NEUTRON FLUX, DETECTOR EFFICIENCIES, INTERNAL CON- 2210000100042 VERSION AND ELECTRON CAPTURE EFFECTS, POSITRON ANNI- 2210000100043 HILATION IN FLIGHT, GEOMETRY AND ATTENUATION IN THE 2210000100044 FOILS. 2210000100045 ERR-ANALYS (DATA-ERR) THE TOTAL ERRORS WERE COMPOSED OF RANDOM 2210000100046 (0.5 - 7.5 PERCENT), NON-STATISTICAL (0.2 PERCENT FOR 2210000100047 ISOMERIC RATIO, 2.1 - 4.6 PERCENT FOR CROSS SECTIONS) 2210000100048 AND DECAY-SCHEME (1 - 3 PERCENT) ERROR CONTRIBUTIONS. 2210000100049 STATUS .DATA OBTAINED FROM MAIN REF. 2210000100050 HISTORY (881101C) N.O. 2210000100051 (881216E) 2210000100052 ENDBIB 50 0 2210000100053 NOCOMMON 0 0 2210000100054 ENDSUBENT 53 0 2210000199999 SUBENT 22100002 19881216 00002210000200001 BIB 4 6 2210000200002 REACTION (47-AG-107(N,2N)47-AG-106-G,,SIG) 2210000200003 DECAY-DATA (47-AG-106-G,24.MIN,B+,1960.,.527, 2210000200004 B+,1450.,.0644) 2210000200005 STATUS .DATA OBTAINED FROM MAIN REF. 2210000200006 HISTORY (881101C) N.O. 2210000200007 (881216E) 2210000200008 ENDBIB 6 0 2210000200009 NOCOMMON 0 0 2210000200010 DATA 5 2 2210000200011 EN DATA DATA-ERR MONIT MONIT-ERR 2210000200012 MEV MB MB MB MB 2210000200013 1.4300E+01 8.1300E+02 3.7000E+01 1.1300E+02 1.0000E+00 2210000200014 1.4670E+01 8.3000E+02 3.5000E+01 1.0890E+02 7.0000E-01 2210000200015 ENDDATA 4 0 2210000200016 ENDSUBENT 15 0 2210000299999 SUBENT 22100003 19881216 00002210000300001 BIB 4 5 2210000300002 REACTION (47-AG-107(N,2N)47-AG-106-G,,SIG) 2210000300003 DECAY-DATA (47-AG-106-G,24.MIN,DG,512.,.1704) 2210000300004 STATUS .DATA OBTAINED FROM MAIN REF. 2210000300005 HISTORY (881101C) N.O. 2210000300006 (881216E) 2210000300007 ENDBIB 5 0 2210000300008 NOCOMMON 0 0 2210000300009 DATA 5 1 2210000300010 EN DATA DATA-ERR MONIT MONIT-ERR 2210000300011 MEV MB MB MB MB 2210000300012 1.4670E+01 8.0600E+02 1.8000E+01 1.0890E+02 7.0000E-01 2210000300013 ENDDATA 3 0 2210000300014 ENDSUBENT 13 0 2210000399999 SUBENT 22100004 19881216 00002210000400001 BIB 4 5 2210000400002 REACTION (47-AG-107(N,2N)47-AG-106-M,,SIG) 2210000400003 DECAY-DATA (47-AG-106-M,8.28D,DG,512.,.882) 2210000400004 STATUS .DATA OBTAINED FROM MAIN REF. 2210000400005 HISTORY (881101C) N.O. 2210000400006 (881216E) 2210000400007 ENDBIB 5 0 2210000400008 NOCOMMON 0 0 2210000400009 DATA 5 1 2210000400010 EN DATA DATA-ERR MONIT MONIT-ERR 2210000400011 MEV MB MB MB MB 2210000400012 1.4300E+01 6.0800E+02 2.2000E+01 1.1300E+02 1.0000E+00 2210000400013 ENDDATA 3 0 2210000400014 ENDSUBENT 13 0 2210000499999 SUBENT 22100005 19881216 00002210000500001 BIB 4 6 2210000500002 REACTION (47-AG-107(N,2N)47-AG-106-M/G,,SIG/RAT) 2210000500003 DECAY-DATA (47-AG-106-G,24.MIN,DG,512.,.1704) 2210000500004 (47-AG-106-M,8.28D,DG,512.,.882) 2210000500005 STATUS .DATA OBTAINED FROM MAIN REF. 2210000500006 HISTORY (881101C) N.O. 2210000500007 (881216E) 2210000500008 ENDBIB 6 0 2210000500009 NOCOMMON 0 0 2210000500010 DATA 5 1 2210000500011 EN DATA DATA-ERR MONIT MONIT-ERR 2210000500012 MEV NO-DIM NO-DIM MB MB 2210000500013 1.4300E+01 7.6500E-01 4.0000E-03 1.1300E+02 1.0000E+00 2210000500014 ENDDATA 3 0 2210000500015 ENDSUBENT 14 0 2210000599999 SUBENT 22100006 19881216 00002210000600001 BIB 4 7 2210000600002 REACTION (47-AG-109(N,2N)47-AG-108-G,,SIG) 2210000600003 DECAY-DATA (47-AG-108-G,2.37MIN,B-,1650.,.954, 2210000600004 B-,1020.,.0176, 2210000600005 B+,890.,.0028) 2210000600006 STATUS .DATA OBTAINED FROM MAIN REF. 2210000600007 HISTORY (881101C) N.O. 2210000600008 (881216E) 2210000600009 ENDBIB 7 0 2210000600010 NOCOMMON 0 0 2210000600011 DATA 5 2 2210000600012 EN DATA DATA-ERR MONIT MONIT-ERR 2210000600013 MEV MB MB MB MB 2210000600014 1.4300E+01 8.4800E+02 3.1000E+01 1.1300E+02 1.0000E+00 2210000600015 1.4670E+01 8.4200E+02 3.0000E+01 1.0890E+02 7.0000E-01 2210000600016 ENDDATA 4 0 2210000600017 ENDSUBENT 16 0 2210000699999 SUBENT 22100007 19881216 00002210000700001 BIB 4 5 2210000700002 REACTION (47-AG-109(N,P)46-PD-109,,SIG) 22102210000700003 DECAY-DATA (46-PD-109-G,13.427HR,B-,1028.,1.) 2210000700004 STATUS .DATA OBTAINED FROM MAIN REF. 2210000700005 HISTORY (881101C) N.O. 2210000700006 (881216E) 2210000700007 ENDBIB 5 0 2210000700008 NOCOMMON 0 0 2210000700009 DATA 5 1 2210000700010 EN DATA DATA-ERR MONIT MONIT-ERR 2210000700011 MEV MB MB MB MB 2210000700012 1.4300E+01 1.5400E+01 8.0000E-01 1.1300E+02 1.0000E+00 2210000700013 ENDDATA 3 0 2210000700014 ENDSUBENT 13 0 2210000799999 SUBENT 22100008 19881216 00002210000800001 BIB 4 6 2210000800002 REACTION (47-AG-109(N,A)45-RH-106-M,,SIG) 2210000800003 DECAY-DATA (45-RH-106-M,130.MIN,B-,920.,.855, 2210000800004 B-,700.,.145) 2210000800005 STATUS .DATA OBTAINED FROM MAIN REF. 2210000800006 HISTORY (881101C) N.O. 2210000800007 (881216E) 2210000800008 ENDBIB 6 0 2210000800009 NOCOMMON 0 0 2210000800010 DATA 5 1 2210000800011 EN DATA DATA-ERR MONIT MONIT-ERR 2210000800012 MEV MB MB MB MB 2210000800013 1.4300E+01 2.1000E+00 2.0000E-01 1.1300E+02 1.0000E+00 2210000800014 ENDDATA 3 0 2210000800015 ENDSUBENT 14 0 2210000899999 ENDENTRY 8 0 2210099999999