ENTRY 23176 20110103 22302317600000001 SUBENT 23176001 20110103 22302317600100001 BIB 16 44 2317600100002 AUTHOR (H.M.Agrawal, R.Pepelnik) 2317600100003 TITLE Determination of the mean neutron energy using the 2317600100004 Zr/Nb and the Ni method. 2317600100005 REFERENCE (J,NIM/A,366,349,1995) Main reference. 2317600100006 INSTITUTE (2GERKIG) 2317600100007 FACILITY (NGEN,2GERKIG) Cylindrical acceleration structure 2317600100008 KORONA as 14 MeV generator. 2317600100009 INC-SPECT Neutron flux during the irradiation is monitored by 2317600100010 multichannel scaling with a time resolution smaller 2317600100011 than the shortest half-life investigated. The long 2317600100012 counter BF3 is calibrated via the reaction 2317600100013 Al-27(n,a)Na-24 using the known cross section. Because 2317600100014 the neutron flux varies within the irradiation volume, 2317600100015 this calibration factor is changed for different 2317600100016 sample geometries. 2317600100017 MONITOR (13-AL-27(N,A)11-NA-24,,SIG) For BF3 counter 2317600100018 calibration. 2317600100019 MONIT-REF (21912001,G.Winkler+,J,ANE,10,601,1983) 2317600100020 In J,ANE,10,601 - Al-27 data were used also as monitor.2317600100021 METHOD (ACTIV) Nb+Zr rabbit irradiated for a period of 7008s. 2317600100022 Second set of Nb+Zr foils was irradiated for a 2317600100023 period of 6660 s with a flux of about 3.E+11 n/cm**2/s.2317600100024 Third set of Nb, Ni and Zr foils encapsulated in a 2317600100025 polyethylene container was irradiated at the centre of 2317600100026 the cylindrical neutron target for 1000s. 2317600100027 SAMPLE Nb and Zr foils were placed together at five positions 2317600100028 on the axis of an aluminum rabbit. 2317600100029 Ni foils - 68.27 % of Ni-58; 2317600100030 Zr foils - 51.45% of Zr-90; 2317600100031 Nb foils - 100% Nb-93. 2317600100032 DETECTOR (GELI) Ge(Li) detector to measure produced activity of 2317600100033 samples. At distance 56.5 mm. Efficiency 17%. 2317600100034 Calibrated to an absolute accuracy of 2% using standard2317600100035 radioactive solutions. 2317600100036 (BF3) Long counter BF3 - to monitor neutron flux. 2317600100037 PART-DET (DG) 2317600100038 REL-REF (I,10709001,D.R.Nethaway,J,JIN,40,1285,1978) 2317600100039 Details of facility. 2317600100040 CORRECTION Summing corrections are important for y-rays emitted 2317600100041 in cascades and detected at a small distance. 2317600100042 Counting losses due to dead time and pulse pile-up are 2317600100043 determined and corrected in real time. 2317600100044 ERR-ANALYS (ERR-1) Uncertainty of detector efficiency. 2317600100045 HISTORY (20120103C) M.M. 2317600100046 ENDBIB 44 0 2317600100047 COMMON 1 3 2317600100048 ERR-1 2317600100049 PER-CENT 2317600100050 2. 2317600100051 ENDCOMMON 3 0 2317600100052 ENDSUBENT 51 0 2317600199999 SUBENT 23176002 20110103 22302317600200001 BIB 6 34 2317600200002 REACTION ((40-ZR-90(N,2N)40-ZR-89,,SIG)/ 2317600200003 (41-NB-93(N,2N)41-NB-92,,SIG)) 2317600200004 Experimentally measured ratio. 2317600200005 Irradiation time 7008 s, 2317600200006 neutron flux 1.72E+10 n/s/cm**2. 2317600200007 DECAY-DATA (40-ZR-89-G,78.4HR,DG,909.,1.00) 2317600200008 (40-ZR-89-M,4.2MIN,DG,909.,0.94) 2317600200009 (41-NB-92-M,10.2D,DG,934.,0.992) 2317600200010 FLAG (1.)Zr foil thickness 0.5 mm, mass 0.537 g, 2317600200011 position along the cylinder axis from centre -7.0mm; 2317600200012 Nb foil thickness 0.5 mm, mass 0.681 g, 2317600200013 position -6.5 mm. 2317600200014 (2.) Zr foil thickness 0.5 mm, mass 0.541 g, 2317600200015 position along the cylinder axis from centre -3.3mm; 2317600200016 Nb foil thickness 0.5 mm, mass 0.682 g, 2317600200017 position -2.8 mm. 2317600200018 (3.)Zr foil thickness 0.13 mm, mass 0.112 g, 2317600200019 position along the cylinder axis from centre +0.5mm; 2317600200020 Nb foil thickness 0.13 mm, mass 0.134 g, 2317600200021 position +0.6 mm. 2317600200022 (4.)Zr foil thickness 0.13 mm, mass 0.112 g, 2317600200023 position along the cylinder axis from centre +3.1mm; 2317600200024 Nb foil thickness 0.13 mm, mass 0.134 g, 2317600200025 position +3.2 mm. 2317600200026 (5.)Zr foil thickness 0.5 mm, mass 0.539 g, 2317600200027 position along the cylinder axis from centre +6.1mm; 2317600200028 Nb foil thickness 0.5 mm, mass 0.684 g, 2317600200029 position +6.6 mm. 2317600200030 ANALYSIS Data of REL-REFs were used in analysis. 2317600200031 REL-REF (R,10709001,D.R.Nethaway,J,JIN,40,1285,1978) Nb data. 2317600200032 (R,30640001,J.Csicai,C,82ANTWER,414,1982) Nb data. 2317600200033 (R,V0043001,T.B.Ryves,R,EUR-11912-EN,1989) Nb data. 2317600200034 (R,21807001,A.Pavlik+,J,JP/G,8,1283,1982) Zr data. 2317600200035 STATUS (TABLE) Table 2 of J,NIM/A,366,349,1995 2317600200036 ENDBIB 34 0 2317600200037 NOCOMMON 0 0 2317600200038 DATA 5 5 2317600200039 EN EN-ERR DATA DATA-ERR FLAG 2317600200040 MEV MEV NO-DIM NO-DIM NO-DIM 2317600200041 14.45 0.05 1.583 0.018 1. 2317600200042 14.47 0.06 1.59 0.018 2. 2317600200043 14.48 0.05 1.599 0.018 3. 2317600200044 14.48 0.06 1.598 0.018 5. 2317600200045 14.51 0.06 1.605 0.018 4. 2317600200046 ENDDATA 7 0 2317600200047 ENDSUBENT 46 0 2317600299999 SUBENT 23176003 20110103 22302317600300001 BIB 6 26 2317600300002 REACTION ((40-ZR-90(N,2N)40-ZR-89,,SIG)/ 2317600300003 (41-NB-93(N,2N)41-NB-92,,SIG)) 2317600300004 Experimentally measured ratio. 2317600300005 Irradiation time 6660 s, 2317600300006 neutron flux 1.65E+10 n/s/cm**2. 2317600300007 Zr foil thickness 0.5 mm, Nb foil thickness 0.5 mm. 2317600300008 DECAY-DATA (40-ZR-89-G,78.4HR,DG,909.,1.00) 2317600300009 (40-ZR-89-M,4.2MIN,DG,909.,0.94) 2317600300010 (41-NB-92-M,10.2D,DG,934.,0.992) 2317600300011 FLAG (1.) Zr foil mass 0.541 g, 2317600300012 position along the cylinder axis from centre -7.1mm; 2317600300013 Nb foil mass 0.681 g, position -6.6 mm. 2317600300014 (2.) Zr foil mass 0.541 g, position -3.5mm; 2317600300015 Nb foil mass 0.683 g, position -3.0 mm. 2317600300016 (3.)Zr foil mass 0.539 g, position +0.3mm; 2317600300017 Nb foil mass 0.682 g, position +0.8 mm. 2317600300018 (4.)Zr foil mass 0.541 g, position +2.5mm; 2317600300019 Nb foil mass 0.684 g, position +3.0 mm 2317600300020 (5.)Zr foil mass 0.539 g, position +6.3mm; 2317600300021 Nb foil mass 0.680 g, position +6.8 mm. 2317600300022 ANALYSIS Data of REL-REFs were used in analysis. 2317600300023 REL-REF (R,10709001,D.R.Nethaway,J,JIN,40,1285,1978) Nb data. 2317600300024 (R,30640001,J.Csicai,C,82ANTWER,414,1982) Nb data. 2317600300025 (R,V0043001,T.B.Ryves,R,EUR-11912-EN,1989) Nb data. 2317600300026 (R,21807001,A.Pavlik+,J,JP/G,8,1283,1982) Zr data. 2317600300027 STATUS (TABLE) Table 2 of J,NIM/A,366,349,1995 2317600300028 ENDBIB 26 0 2317600300029 NOCOMMON 0 0 2317600300030 DATA 5 5 2317600300031 EN EN-ERR DATA DATA-ERR FLAG 2317600300032 MEV MEV NO-DIM NO-DIM NO-DIM 2317600300033 14.48 0.05 1.595 0.016 1. 2317600300034 14.48 0.06 1.595 0.018 2. 2317600300035 14.50 0.05 1.604 0.018 5. 2317600300036 14.51 0.05 1.605 0.016 3. 2317600300037 14.51 0.05 1.605 0.016 4. 2317600300038 ENDDATA 7 0 2317600300039 ENDSUBENT 38 0 2317600399999 SUBENT 23176004 20110103 22302317600400001 BIB 3 12 2317600400002 REACTION ((40-ZR-90(N,2N)40-ZR-89,,SIG)/ 2317600400003 (41-NB-93(N,2N)41-NB-92,,SIG)) 2317600400004 Experimentally measured ratio. 2317600400005 Irradiation time 1000 s, 2317600400006 neutron flux 1.77E+10 n/s/cm**2. 2317600400007 Zr foil thickness 0.5 mm, mass 0.06770 g, 2317600400008 Nb foil thickness 0.5 mm, mass 0.08515 g. 2317600400009 Position - in centre of neutron tube. 2317600400010 DECAY-DATA (40-ZR-89-G,78.4HR,DG,909.,1.00) 2317600400011 (40-ZR-89-M,4.2MIN,DG,909.,0.94) 2317600400012 (41-NB-92-M,10.2D,DG,934.,0.992) 2317600400013 STATUS (TABLE) Table 2 of J,NIM/A,366,349,1995 2317600400014 ENDBIB 12 0 2317600400015 NOCOMMON 0 0 2317600400016 DATA 4 1 2317600400017 EN EN-ERR DATA DATA-ERR 2317600400018 MEV MEV NO-DIM NO-DIM 2317600400019 14.53 0.05 1.608 0.018 2317600400020 ENDDATA 3 0 2317600400021 ENDSUBENT 20 0 2317600499999 SUBENT 23176005 20110103 22302317600500001 BIB 6 23 2317600500002 REACTION ((28-NI-58(N,2N)28-NI-57,,SIG)/ 2317600500003 (28-NI-58(N,P)27-CO-58,,SIG)) 2317600500004 Experimentally measured ratio. 2317600500005 Irradiation time 1000 s, 2317600500006 neutron flux 1.77E+10 n/s/cm**2. 2317600500007 Ni foil thickness 0.5 mm, mass 0.17262 g, 2317600500008 Position - in centre of neutron tube. 2317600500009 DECAY-DATA (28-NI-57,36.08HR,DG,1378.,0.778) 2317600500010 (27-CO-58-M,9.15HR) IT 2317600500011 (27-CO-58-G,70.8D,DG,811.,0.995) 2317600500012 ANALYSIS Data of REL-REF were used in analysis. 2317600500013 REL-REF (R,21965001,A.Pavlik+,J,NSE,90,186,1985) Ni data. 2317600500014 CRITIQUE Of compiler. 2317600500015 Comparing data of table with data of Fig.1,2, 2317600500016 one could mentioned: 2317600500017 Fig.1 - lines of c-s Zr and Nb cross at En about 2317600500018 13.6 MeV and at this En - c-s ratio is equal 1. 2317600500019 It's o'k. 2317600500020 Fig.2 - lines of c-s cross each other at En about 14.2,2317600500021 at this En ratio of c-s is about 13 - it looks strange.2317600500022 If c-s are equal each other, ratio has to be equal 1. 2317600500023 So there is possibility of mistake in this measurement.2317600500024 STATUS (TABLE) Table 2 of J,NIM/A,366,349,1995 2317600500025 ENDBIB 23 0 2317600500026 NOCOMMON 0 0 2317600500027 DATA 4 1 2317600500028 EN EN-ERR DATA DATA-ERR 2317600500029 MEV MEV NO-DIM NO-DIM 2317600500030 14.66 0.20 8.098 0.84 2317600500031 ENDDATA 3 0 2317600500032 ENDSUBENT 31 0 2317600599999 ENDENTRY 5 0 2317699999999