ENTRY 22019 19870309 00002201900000001 SUBENT 22019001 19870309 00002201900100001 BIB 18 47 2201900100002 INSTITUTE (2GERPTB) PHYSICALISCH-TECHNISCHE BUNDESANSTALT, 2201900100003 BRAUNSCHWEIG. 2201900100004 REFERENCE (C,84GEESTH,2,801,8409) 2201900100005 AUTHOR (W.MANNHART) 2201900100006 TITLE -RECENT EXPERIMENTS ON CF-252 SPECTRUM-AVERAGED 2201900100007 NEUTRON CROSS SECTIONS. 2201900100008 FACILITY .NONE. 2201900100009 INC-SOURCE (CF252) CF-252 SPONTANEOUS FISSION NEUTRON 2201900100010 SOURCE, ENCAPSULATED IN A DOUBLE ZIRCALOY 2201900100011 CYLINDER WITH OUTER DIMENSIONS OF 10 MM IN 2201900100012 DIAMETER AND 10 MM IN HEIGHT. THE WALL 2201900100013 THICKNESS OF THE CYLINDER WAS 1.5 MM. 2201900100014 THE NEUTRON SOURCE STRENGTH WAS APPROXIMATELY 2201900100015 4.7E+09 N/SEC ON APRIL 1, 1982. 2201900100016 INC-SPECT .CF-252 NEUTRON SPECTRUM. 2201900100017 SAMPLE .HIGH PURITY METALLIC DISKS, 10 MM IN DIAMETER AND 2201900100018 .125 - .5 MM THICK. 2201900100019 .POWDERS (CU-O, I2-O5, HG-O) WERE PRESSED IN LUCITE 2201900100020 CYLINDERS WITH INNER DIAMETER 10 MM AND LENGTH .8 MM. 2201900100021 WALL THICKNESSES WERE .2 MM AT THE FRONT AND REAR 2201900100022 PLANE AND 1. MM AT THE ENVELOPE. 2201900100023 METHOD (ACTIV) THE IRRADIATIONS WERE PERFORMED USING THE 2201900100024 SANDWICH METHOD, I.E. EACH SAMPLE WAS PLACED 2201900100025 BETWEEN TWO FOILS ACTING AS NEUTRON FLUX 2201900100026 DENSITY MONITORS. 2201900100027 DETECTOR (GELI ) LARGE VOLUME (130 CM3) GE(LI) DETECTOR WITH 2201900100028 A NOMINAL EFFICIENCY OF 28 PERC. 2201900100029 MONITOR 1(28-NI-58(N,P)27-CO-58,,SIG,,FIS) 2201900100030 2(49-IN-115(N,INL)49-IN-115-M,,SIG,,FIS) 2201900100031 MONIT-REF (20619000,MANNHART+,J,NSE,69,333,7902) 2201900100032 DECAY-MON (27-CO-58-G,70.78D,DG,810.8,.9945) 2201900100033 (49-IN-115-M,4.486HR,DG,336.2,.459) 2201900100034 PART-DET (DG) DECAY GAMMAS. 2201900100035 STATUS .DATA WERE TAKEN FROM MAIN REFERENCE. 2201900100036 HISTORY (861112C) NO. 2201900100037 (861212E) 2201900100038 CORRECTION .THE DATA WERE CORRECTED FOR CONTRIBUTION FROM 2201900100039 COMPETING REACTIONS, SCATTERING EFFECTS, THE 2201900100040 FINITE VOLUME OF THE SAMPLES, SELF-ABSORPTION 2201900100041 WITHIN THE SAMPLES, ETC. 2201900100042 ERR-ANALYS (ERR-T) TOTAL ERRORS ARE COMPOSED OF- 2201900100043 ERROR IN SCATTERING CORRECTION 1. PER CENT 2201900100044 ERROR IN CORRECTION FOR COMPETING 2201900100045 REACTIONS 2201900100046 COUNTING STATISTICS 2201900100047 ERROR IN PHOTOPEAK EFFICIENCY 1.5 PER CENT 2201900100048 ERROR IN MONITOR CROSS SECTION 2.-3. PER CENT 2201900100049 ENDBIB 47 0 2201900100050 COMMON 3 3 2201900100051 EN-DUMMY MONIT1 MONIT2 2201900100052 MEV MB MB 2201900100053 1.5000E+00 1.1800E+02 1.9500E+02 2201900100054 ENDCOMMON 3 0 2201900100055 ENDSUBENT 54 0 2201900199999 SUBENT 22019002 19861212 00002201900200001 BIB 4 5 2201900200002 REACTION (23-V-51(N,P)22-TI-51,,SIG,,FIS) 2201900200003 DECAY-DATA (22-TI-51,5.76MIN,DG,320.1,.930) 2201900200004 STATUS .DATA WERE TAKEN FROM MAIN REFERENCE. 2201900200005 HISTORY (861112C) NO. 2201900200006 (861212E) 2201900200007 ENDBIB 5 0 2201900200008 NOCOMMON 0 0 2201900200009 DATA 2 1 2201900200010 DATA ERR-T 2201900200011 MB MB 2201900200012 6.3700E-01 1.8000E-02 2201900200013 ENDDATA 3 0 2201900200014 ENDSUBENT 13 0 2201900299999 SUBENT 22019003 19861212 00002201900300001 BIB 4 7 2201900300002 REACTION (23-V-51(N,A)21-SC-48,,SIG,,FIS) 2201900300003 DECAY-DATA (21-SC-48,43.7HR,DG,983.5,1., 2201900300004 DG,1037.5,.975, 2201900300005 DG,1312.1,1.) 2201900300006 STATUS .DATA WERE TAKEN FROM MAIN REFERENCE. 2201900300007 HISTORY (861112C) NO. 2201900300008 (861212E) 2201900300009 ENDBIB 7 0 2201900300010 NOCOMMON 0 0 2201900300011 DATA 2 1 2201900300012 DATA ERR-T 2201900300013 MB MB 2201900300014 3.8800E-02 1.2000E-03 2201900300015 ENDDATA 3 0 2201900300016 ENDSUBENT 15 0 2201900399999 SUBENT 22019004 19861212 00002201900400001 BIB 5 8 2201900400002 REACTION (29-CU-65(N,2N)29-CU-64,,SIG,,FIS) 2201900400003 DECAY-DATA (29-CU-64,12.701HR,AR,511.0,.3574) 2201900400004 COMMENT .TO ENSURE COMPLETE ANNIHILATION THE SAMPLES WERE 2201900400005 PLACED INSIDE CLOSED COPPER CONTAINERS WITH A 2201900400006 WALL THICKNESS OF 1.5 MM. 2201900400007 STATUS .DATA WERE TAKEN FROM MAIN REFERENCE. 2201900400008 HISTORY (861112C) NO. 2201900400009 (861212E) 2201900400010 ENDBIB 8 0 2201900400011 NOCOMMON 0 0 2201900400012 DATA 2 1 2201900400013 DATA ERR-T 2201900400014 MB MB 2201900400015 6.6500E-01 2.3000E-02 2201900400016 ENDDATA 3 0 2201900400017 ENDSUBENT 16 0 2201900499999 SUBENT 22019005 19861212 00002201900500001 BIB 5 8 2201900500002 REACTION (30-ZN-64(N,P)29-CU-64,,SIG,,FIS) 2201900500003 DECAY-DATA (29-CU-64,12.701HR,AR,511.0,.3574) 2201900500004 COMMENT .TO ENSURE COMPLETE ANNIHILATION THE SAMPLES WERE 2201900500005 PLACED INSIDE CLOSED COPPER CONTAINERS WITH A 2201900500006 WALL THICKNESS OF 1.5 MM. 2201900500007 STATUS .DATA WERE TAKEN FROM MAIN REFERENCE. 2201900500008 HISTORY (861112C) NO. 2201900500009 (861212E) 2201900500010 ENDBIB 8 0 2201900500011 NOCOMMON 0 0 2201900500012 DATA 2 1 2201900500013 DATA ERR-T 2201900500014 MB MB 2201900500015 4.1100E+01 1.3000E+00 2201900500016 ENDDATA 3 0 2201900500017 ENDSUBENT 16 0 2201900599999 SUBENT 22019006 19861212 00002201900600001 BIB 4 6 2201900600002 REACTION (53-I-127(N,2N)53-I-126,,SIG,,FIS) 2201900600003 DECAY-DATA (53-I-126,13.02D,DG,388.6,.341, 2201900600004 DG,666.3,.331) 2201900600005 STATUS .DATA WERE TAKEN FROM MAIN REFERENCE. 2201900600006 HISTORY (861112C) NO. 2201900600007 (861212E) 2201900600008 ENDBIB 6 0 2201900600009 NOCOMMON 0 0 2201900600010 DATA 2 1 2201900600011 DATA ERR-T 2201900600012 MB MB 2201900600013 2.0700E+00 7.0000E-02 2201900600014 ENDDATA 3 0 2201900600015 ENDSUBENT 14 0 2201900699999 SUBENT 22019007 19861212 00002201900700001 BIB 4 6 2201900700002 REACTION (80-HG-199(N,INL)80-HG-199-M,,SIG,,FIS) 2201900700003 DECAY-DATA (80-HG-199-M,42.6MIN,DG,158.4,.523, 2201900700004 DG,374.1,.123) 2201900700005 STATUS .DATA WERE TAKEN FROM MAIN REF. 2201900700006 HISTORY (861112C) NO. 2201900700007 (861212E) 2201900700008 ENDBIB 6 0 2201900700009 NOCOMMON 0 0 2201900700010 DATA 2 1 2201900700011 DATA ERR-T 2201900700012 MB MB 2201900700013 2.9500E+02 8.0000E+00 2201900700014 ENDDATA 3 0 2201900700015 ENDSUBENT 14 0 2201900799999 ENDENTRY 7 0 2201999999999