ENTRY 13815 20020129 00001381500000001 SUBENT 13815001 20020129 00001381500100001 BIB 14 51 1381500100002 INSTITUTE (1USAANL) 1381500100003 REFERENCE (J,NIM,105,453,1972) 1381500100004 AUTHOR (G.D.LOPER,G.E.THOMAS) 1381500100005 TITLE GAMMA-RAY INTENSITY STANDARDS: THE REACTIONS 1381500100006 14N(n,g)15N, 35Cl(n,g)36Cl and 53Cr(n,g)54Cr 1381500100007 FACILITY (REAC,1USAANL) Reactor CP-5. 1381500100008 INC-SOURCE (REAC) Reactor core with a thermal neutron flux ~3E+13 1381500100009 n/(cm2.s). 1381500100010 INC-SPECT Reactor spectrum. 1381500100011 SAMPLE A lead disk (0.4 mm thick) and sample mixture placed 1381500100012 in a graphite holder of 1.7-cm inner diameter. Sample 1381500100013 positioned in such a way that its mixture part was 1381500100014 nearest the detector in order to minimize gamma-ray 1381500100015 absorption. 1381500100016 METHOD Internal-target facility used: target sample placed in 1381500100017 the middle of the through-tube (adjacent to the 1381500100018 reactor core) and viewed by a detector located outside1381500100019 the reactor. 1381500100020 DETECTOR (GELI) Annihilation-pair spectrometer with a 4-cm**3 1381500100021 Ge(Li) detector. 1381500100022 MONITOR (82-PB-207(N,G)82-PB-208,,SPC,,SPA) Absolute 1381500100023 intensities measured by comparing with well-known 1381500100024 100% intensity of the 7368-keV transition in 208Pb. 1381500100025 (82-PB-207(N,G)82-PB-208,,SIG,,MXW) Capture cross 1381500100026 section of 709(10) mb used to obtain the absolute 1381500100027 intensity from the observed counting rate in a gamma 1381500100028 line. 1381500100029 (7-N-14(N,G)7-N-15,,SPC,,SPA) Pairs of lines in 1381500100030 14N(n,g)15N used as reference lines for calibration. 1381500100031 Detector-efficiency curves computed from previously 1381500100032 reported relative intensities for transitions in 1381500100033 14N(n,g)15N and in 53Cr(n,g)54Cr, 1381500100034 Absolute intensity determined from the observed 1381500100035 counting rate in a gamma line, the neutron-capture 1381500100036 rate and the detector efficiency. 1381500100037 ** Comment by author ** Good agreement found between 1381500100038 the shapes of the detector-efficiency curves computed 1381500100039 from previously reported relative intensities for 1381500100040 transitions in 14N(n,g)15N and 53Cr(n,g)54Cr. 1381500100041 Reactions 53Cr(n,g)54Cr and 35Cl(n,g)36Cl established 1381500100042 as absolute intensity standards. 1381500100043 CORRECTION Data corrected for gamma-ray transmission. 1381500100044 ERR-ANALYS (DATA-ERR) Uncertainties of absolute line intensities; 1381500100045 includes uncertainties in the cross sections as well 1381500100046 as in the efficiencies. Error due to determining the 1381500100047 areas under the gamma-ray peaks considered negligible.1381500100048 (E-ERR) Uncertainties in gamma-ray energies due to 1381500100049 uncertainties in the location of the line position and1381500100050 especially to the uncertainty in the energies of the 1381500100051 reference lines. 1381500100052 HISTORY (20020117C) IS 1381500100053 ENDBIB 51 0 1381500100054 COMMON 1 3 1381500100055 EN-DUMMY 1381500100056 EV 1381500100057 0.0253 1381500100058 ENDCOMMON 3 0 1381500100059 ENDSUBENT 58 0 1381500199999 SUBENT 13815002 20020129 00001381500200001 BIB 3 4 1381500200002 REACTION (24-CR-53(N,G)24-CR-54,,SPC,,SPA) 1381500200003 SAMPLE Contained 240 mg of natural cromium powder and melamine1381500200004 with 466-mg disk of 207Pb. 1381500200005 STATUS Data taken from Table 2 of reference. 1381500200006 ENDBIB 4 0 1381500200007 NOCOMMON 0 0 1381500200008 DATA 4 14 1381500200009 E E-ERR DATA DATA-ERR 1381500200010 KEV KEV PC/REAC PC/REAC 1381500200011 9717.7 0.5 15.0 2.6 1381500200012 8883.3 0.5 46.2 7.9 1381500200013 7098.9 0.4 7.8 0.7 1381500200014 6889.1 0.4 2.0 0.2 1381500200015 6644.8 0.4 9.5 0.9 1381500200016 6281.6 0.3 1.8 0.2 1381500200017 5998.8 0.3 4.3 0.4 1381500200018 5857.9 0.3 1.1 0.1 1381500200019 5705.8 0.3 1.3 0.1 1381500200020 4872.3 0.3 0.7 0.1 1381500200021 4846.8 0.3 1.5 0.1 1381500200022 3719.6 0.2 3.6 0.3 1381500200023 2601.8 0.2 2.4 0.2 1381500200024 2238.8 0.2 10.2 1.0 1381500200025 ENDDATA 16 0 1381500200026 ENDSUBENT 25 0 1381500299999 SUBENT 13815003 20020129 00001381500300001 BIB 3 4 1381500300002 REACTION (24-CR-52(N,G)24-CR-53,,SPC,,SPA) 1381500300003 SAMPLE Contained 240 mg of natural cromium powder and melamine1381500300004 with 466-mg disk of 207Pb. 1381500300005 STATUS Data taken from Table 2 of reference. 1381500300006 ENDBIB 4 0 1381500300007 NOCOMMON 0 0 1381500300008 DATA 4 6 1381500300009 E E-ERR DATA DATA-ERR 1381500300010 KEV KEV PC/REAC PC/REAC 1381500300011 7938.9 0.5 65.6 8.4 1381500300012 7375.0 0.4 12.8 1.2 1381500300013 5618.4 0.3 18.8 1.8 1381500300014 4322.7 0.3 4.1 0.4 1381500300015 3616.7 0.2 4.0 0.4 1381500300016 2320.9 0.2 20.7 1.9 1381500300017 ENDDATA 8 0 1381500300018 ENDSUBENT 17 0 1381500399999 SUBENT 13815004 20020129 00001381500400001 BIB 3 4 1381500400002 REACTION (24-CR-50(N,G)24-CR-51,,SPC,,SPA) 1381500400003 SAMPLE Contained 240 mg of natural cromium powder and melamine1381500400004 with 466-mg disk of 207Pb. 1381500400005 STATUS Data taken from Table 2 of reference. 1381500400006 ENDBIB 4 0 1381500400007 NOCOMMON 0 0 1381500400008 DATA 4 9 1381500400009 E E-ERR DATA DATA-ERR 1381500400010 KEV KEV PC/REAC PC/REAC 1381500400011 8512.1 0.5 29.0 3.8 1381500400012 8484.0 0.5 20.7 2.7 1381500400013 7362.0 0.4 11.4 1.1 1381500400014 6370.9 0.4 3.6 0.3 1381500400015 6135.5 0.3 6.7 0.6 1381500400016 5494.6 0.3 1.7 0.2 1381500400017 5491.4 0.3 2.3 0.2 1381500400018 5221.9 0.3 2.4 0.2 1381500400019 2376.8 0.2 4.9 0.5 1381500400020 ENDDATA 11 0 1381500400021 ENDSUBENT 20 0 1381500499999 SUBENT 13815005 20020129 00001381500500001 BIB 3 4 1381500500002 REACTION (17-CL-35(N,G)17-CL-36,,SPC,,SPA) 1381500500003 SAMPLE Contained 5.70 mg of 35Cl (in natural NaCl) and 1381500500004 melamine, with 482-mg disk of 207Pb. 1381500500005 STATUS Data taken from Table 3 of reference. 1381500500006 ENDBIB 4 0 1381500500007 NOCOMMON 0 0 1381500500008 DATA 4 16 1381500500009 E E-ERR DATA DATA-ERR 1381500500010 KEV KEV PC/REAC PC/REAC 1381500500011 8579.2 0.7 2.9 0.5 1381500500012 7790.6 0.5 8.7 1.0 1381500500013 7413.9 0.4 10.7 0.7 1381500500014 6977.8 0.4 2.4 0.2 1381500500015 6627.7 0.4 5.1 0.3 1381500500016 6619.7 0.4 8.2 0.6 1381500500017 6110.6 0.4 19.8 1.3 1381500500018 6086.5 0.4 1.0 0.1 1381500500019 5902.8 0.3 1.1 0.1 1381500500020 5715.2 0.3 5.4 0.4 1381500500021 5517.2 0.3 1.9 0.1 1381500500022 4979.7 0.3 3.7 0.3 1381500500023 3062.3 0.2 3.8 0.3 1381500500024 2864.5 0.2 6.8 0.5 1381500500025 1959.6 0.2 14.0 0.9 1381500500026 1951.3 0.2 20.6 1.4 1381500500027 ENDDATA 18 0 1381500500028 ENDSUBENT 27 0 1381500599999 ENDENTRY 5 0 1381599999999