ENTRY 22124 19891211 00002212400000001 SUBENT 22124001 19891211 00002212400100001 BIB 14 94 2212400100002 REFERENCE (W,LISKIEN,89) 2212400100003 TITLE -THE EXCITATION FUNCTION FOR THE REACTION 2212400100004 CR-52(N,2N)CR-51. 2212400100005 AUTHOR (H.LISKIEN,M.UHL,M.WAGNER,G.WINKLER) 2212400100006 INSTITUTE (2ZZZGEL) H.LISKIEN. EXPERIMENTAL SITE FOR IRRADIATION.2212400100007 (2AUSIRK) M.WAGNER, G.WINKLER, H.VONACH. EXPERIMENTAL 2212400100008 SITE FOR ACTIVITY MEASUREMENTS. 2212400100009 FACILITY (VDG ) THE CN-TYPE HVEC 7 MV VAN DE GRAAFF ACCELERATOR2212400100010 OF CBNM. DELIVERED A 9.6 MICRO-AMP DEUTERON BEAM OF 2212400100011 AVERAGE ENERGY 3000 +/- 20 KEV IN THE TARGET FOR 2212400100012 4.0833 DAYS. 2212400100013 INC-SOURCE (D-T ) A T-TI TARGET WITH A 3 CM DIAMETER TITANIUM 2212400100014 LAYER OF 4.42 MILLIGRAM/CM2 THICKNESS LOADED WITH 2212400100015 TRITIUM WITH A T/TI RATIO OF 1.3. THE TARGET WAS 2212400100016 BACKED BY A 4 CM DIAMETER SILVER SHEET OF 0.25 MM 2212400100017 THICKNESS. IT WAS GLUED IN A CYLINDRICAL ALUMINIUM 2212400100018 TARGET HOLDER WITH 1 MM WALL THICKNESS. THE WHOLE 2212400100019 ASSEMBLY WAS WOBBLED AND AIR COOLED. THE ENERGY LOSS 2212400100020 IN HALF THE T-TI LAYER WAS 270 KEV. 2212400100021 METHOD (ACTIV) THE SAMPLES WERE ACTIVATED IN DIFFERENT ANGULAR2212400100022 POSITIONS WITH RESPECT TO THE BEAM DIRECTION. IN THIS 2212400100023 WAY THE NEUTRON ENERGY VARIATION WITH ANGLE FROM THE 2212400100024 SOURCE REACTION COULD BE USED FOR THE EXCITATION 2212400100025 FUNCTION MEASUREMENT. 2212400100026 DETECTOR (GE-IN) THE ACTIVITIES OF THE SAMPLES WERE MEASURED 2212400100027 RELATIVE TO EACH OTHER USING AN INTRINSIC GERMANIUM 2212400100028 DETECTOR AT IRK AND DETERMINING THE FULL-ENERGY PEAK 2212400100029 AREA OF THE 320 KEV GAMMA-RAY. 2212400100030 (NAICR) ABSOLUTE ACTIVITIES WERE DETERMINED FOR THE 2212400100031 SAMPLES WITH HIGHEST ACTIVITY USING A 12.7 CM DIAMTER 2212400100032 BY 12.7 CM THICK WELL-TYPE NAI-TL SCINTILLATOR AT IRK,2212400100033 COUNTING ABOVE AN ENERGY DISCRIMINATION LEVEL OF 22.1 2212400100034 KEV. 2212400100035 MONITOR (1-H-1(N,EL)1-H-1,,DA) THE TRIPLE-COINCIDENCE PROTON 2212400100036 RECOIL TELESCOPE TC2 OF CBNM, POSITIONED IN THE 2212400100037 DEUTERON BEAM DIRECTION WITH A SOURCE TO RADIATOR 2212400100038 DISTANCE OF 80 CM, WAS USED FOR THE ABSOLUTE FLUENCE 2212400100039 DETERMINATION. THE FLUENCE WAS FOUND TO BE 1.887E+13 2212400100040 +/- 0.051E+13 NEUTRONS/SR, THE MAIN UNCERTAINTY BEING 2212400100041 THE HYDROGEN CONTENT OF THE 43.75 MG/CM2 POLYETHYLENE 2212400100042 RADIATOR USED. THE FLUENCE AT OTHER ANGLES WAS DETER- 2212400100043 MINED BY USING THE KNOWN ANGULAR DISTRIBUTION OF THE 2212400100044 SOURCE REACTION. 2212400100045 .THE SIX CR SAMPLES 2212400100046 POSITIONED AT 99, 105 AND 111 DEGREES WERE SANDWICHED 2212400100047 BETWEEN TWO NIOBIUM FOILS IN ORDER TO CHECK THE 2212400100048 FLUENCE DETERMINATIONS IN THE 14 MEV REGION USING THE 2212400100049 41-NB-93/N,2N/-REACTION. THE ACTIVITY OF THE NB FOILS 2212400100050 WERE MEASURED WITH THE NAI-DETECTOR. THE RESULT AGREED2212400100051 WITH THE PROTON RECOIL MEASUREMENTS WITHIN +/- 1 2212400100052 PERCENT. 2212400100053 SAMPLE .24 METALLIC SAMPLES OF RECTANGULAR SHAPE, 16 X 8 X 0.82212400100054 MM. THEY WERE FIXED SYMMETRICALLY TO THE ION BEAM 2212400100055 DIRECTION IN AN ALUMINIUM SAMPLE HOLDER RING OF 99 MM 2212400100056 RADIUS AT NOMINAL ANGLES 9, 21, 33, 45, 57, 69, 81, 2212400100057 99, 105 111, 123 AND 135 DEGREES. A 400 PPM ANTIMONY 2212400100058 IMPURITY WAS FOUND IN THE SAMPLES. 2212400100059 CORRECTION .THE NEUTRON FLUENCE WAS CORRECTED FOR NEUTRON ATTENU- 2212400100060 ATION AND NEUTRON IN- AND OUTSCATTERING BY THE TARGET 2212400100061 BACKING AND ITS HOLDER. 2212400100062 .THE MEASURED ACTIVITIES WERE CORRECTED FOR SELF- 2212400100063 ATTENUATION AND COMPTON SCATTERING IN THE SAMPLES. 2212400100064 ACTIVATION ENHANCEMENT DUE TO ELASTIC SCATTERING IN 2212400100065 THE SAMPLES AND DUE TO INSCATTERING FROM ADJACENT 2212400100066 MATERIAL WAS ALSO TAKEN INTO ACCOUNT. 2212400100067 ERR-ANALYS (DATA-ERR) TOTAL UNCERTAINTIES, ONE STANDARD DEVIATION.2212400100068 THE TOTAL UNCERTAINTIES ARE COMPOSED OF CONTRIBUTIONS 2212400100069 BEING EQUAL FOR ALL SAMPLES AND THOSE WHICH VARY FROM 2212400100070 SAMPLE TO SAMPLE. SEE BELOW, WHERE ALL ERRORS ARE ONE 2212400100071 STANDARD DEVIATION. 2212400100072 . 2212400100073 UNCERTAINTIES COMMON FOR ALL SAMPLES PERCENT2212400100074 ------------------------------------------------------2212400100075 SAMPLE WEIGHTS 0.05 2212400100076 ACTIVITY INCREASE DUE TO SCATTERING 0.10 2212400100077 TIMES AND HALF-LIVES 0.03 2212400100078 ISOTOPIC ABUNDANCES OF SAMPLES 0.01 2212400100079 ACTIVITY NORMALIZATION 0.40 2212400100080 EFFICIENCY OF THE NAI-COUNTER 1.04 2212400100081 NEUTRON FLUX VIA RECOIL PROTONS 2.70 2212400100082 INFLUENCE OF THE SAMPLE HOLDER 0.50 2212400100083 ------------------------------------------------------2212400100084 . 2212400100085 UNCERTAINTIES FOR INDIVIDUAL SAMPLES PERCENT 2212400100086 ------------------------------------------------------2212400100087 ACTIVITY STATISTICS 0.20 - 1.702212400100088 NEUTRON SOURCE ANGULAR DISTRIBUTION 0.08 - 2.532212400100089 NEUTRON ABSORPTION IN TARGET MATERIAL 0.18 - 5.002212400100090 NEUTRON INSCATTERING 0.04 - 0.602212400100091 SOURCE-SAMPLE DISTANCE 0.43 - 0.532212400100092 ------------------------------------------------------2212400100093 STATUS .DATA TAKEN FROM MAIN REF. 2212400100094 HISTORY (881014C) N.O. 2212400100095 (891211E) 2212400100096 ENDBIB 94 0 2212400100097 NOCOMMON 0 0 2212400100098 ENDSUBENT 97 0 2212400199999 SUBENT 22124002 19891211 00002212400200001 BIB 5 7 2212400200002 REACTION (24-CR-52(N,2N)24-CR-51,,SIG) 2212400200003 DECAY-DATA (24-CR-51,27.704D,G,320.08,0.0985) 2212400200004 MISC-COL (MISC ) AVERAGE NEUTRON EMISSION ANGLE FROM THE T(D,N)-2212400200005 REACTION. 2212400200006 STATUS .DATA TAKEN FROM MAIN REF. 2212400200007 HISTORY (891014C) N.O. 2212400200008 (891211E) 2212400200009 ENDBIB 7 0 2212400200010 NOCOMMON 0 0 2212400200011 DATA 6 24 2212400200012 EN EN-ERR EN-RSL-HW MISC DATA DATA-ERR 2212400200013 MEV MEV MEV ADEG MB MB 2212400200014 1.2722E+01 8.0000E-03 9.3000E-02 1.3530E+02 3.8800E+01 1.5000E+002212400200015 1.2744E+01 8.0000E-03 9.3000E-02 1.3470E+02 4.1200E+01 1.6000E+002212400200016 1.3251E+01 1.0000E-02 1.1400E-01 1.2320E+02 1.2190E+02 5.0000E+002212400200017 1.3271E+01 1.0000E-02 1.1400E-01 1.2280E+02 1.2370E+02 5.1000E+002212400200018 1.3888E+01 9.0000E-03 1.3300E-01 1.1120E+02 2.4060E+02 9.7000E+002212400200019 1.3902E+01 9.0000E-03 1.3300E-01 1.1090E+02 2.5060E+02 1.0100E+012212400200020 1.4251E+01 8.0000E-03 1.4300E-01 1.0500E+02 3.2200E+02 1.2500E+012212400200021 1.4329E+01 8.0000E-03 1.4300E-01 1.0520E+02 3.0890E+02 1.2000E+012212400200022 1.4616E+01 9.0000E-03 1.5000E-01 9.9100E+01 3.7780E+02 1.4400E+012212400200023 1.4622E+01 9.0000E-03 1.5000E-01 9.9000E+01 3.7980E+02 1.4500E+012212400200024 1.5814E+01 1.3000E-02 1.6000E-01 8.1200E+01 5.2220E+02 3.2900E+012212400200025 1.5825E+01 1.3000E-02 1.6000E-01 8.1000E+01 5.3110E+02 3.3500E+012212400200026 1.6640E+01 1.5000E-02 1.6900E-01 6.9200E+01 5.7150E+02 2.1000E+012212400200027 1.6653E+01 1.5000E-02 1.6900E-01 6.9000E+01 5.7190E+02 2.1100E+012212400200028 1.7439E+01 1.9000E-02 2.1100E-01 5.7300E+01 6.0890E+02 2.1000E+012212400200029 1.7458E+01 1.9000E-02 2.1100E-01 5.6900E+01 6.1010E+02 2.1100E+012212400200030 1.8166E+01 2.2000E-02 2.6500E-01 4.5400E+01 6.2820E+02 2.0600E+012212400200031 1.8196E+01 2.2000E-02 2.6500E-01 4.4900E+01 6.2710E+02 2.0600E+012212400200032 1.8783E+01 2.4000E-02 2.9700E-01 3.3400E+01 6.4140E+02 2.0100E+012212400200033 1.8803E+01 2.4000E-02 2.9700E-01 3.2800E+01 6.3550E+02 2.0000E+012212400200034 1.9239E+01 2.5000E-02 3.0400E-01 2.1500E+01 6.4180E+02 1.9600E+012212400200035 1.9259E+01 2.5000E-02 3.0400E-01 2.0800E+01 6.4560E+02 1.9800E+012212400200036 1.9508E+01 2.5000E-02 3.4000E-01 9.7000E+00 6.4910E+02 1.9700E+012212400200037 1.9514E+01 2.5000E-02 3.4000E-01 9.1000E+00 6.5220E+02 1.9800E+012212400200038 ENDDATA 26 0 2212400200039 ENDSUBENT 38 0 2212400299999 ENDENTRY 2 0 2212499999999