ENTRY 20930 20150702 22432093000000001 SUBENT 20930001 20150702 22432093000100001 BIB 15 69 2093000100002 INSTITUTE (2UK BIA) University of Aston, Birmingham. 2093000100003 REFERENCE (J,JIN,31,1,196901) 2093000100004 (J,NAT,216,996,196712) This article, by A.J.Cox and 2093000100005 D.Crumpton, gives (n,2n) cross-sections for 2093000100006 the Cu isotopes one of which, Cu-63(n,2n) is 2093000100007 superseded in the present work in which 2093000100008 more recent branching ratio is used. The 2093000100009 theoretical treatment is also reproduced. 2093000100010 AUTHOR (D.Crumpton,A.J.Cox,P.N.Cooper,P.E.Francois,S.E.Hunt) 2093000100011 TITLE Absolute determination of activation cross-sections 2093000100012 for 14.7 and 14.8 MeV neutrons 2093000100013 FACILITY (VDG,2UK BIA) Van de Graaff producing 300 keV deuterons2093000100014 SAMES accelerator giving 140 keV deuterons. 2093000100015 INC-SOURCE (D-T) Deuterium-tritium, target thickness large 2093000100016 compared with range of incident deuterons. 2093000100017 INC-SPECT .Neutron energy spectra from target computed by the 2093000100018 method of J.Benveniste and J.Zenger, report number 2093000100019 UCRL 4266. Mean neutron energy was 14.7 MeV at 140 2093000100020 keV deuteron energy and 14.8 MeV at 300 keV. 2093000100021 REL-REF (M,,J.Benveniste+,R,UCRL-4266,1954) Determination of 2093000100022 the neutron energy spectra from thick targets 2093000100023 METHOD (ACTIV) Activation. 2093000100024 DETECTOR (NAICR) 7.6 cm by 7.6 cm NaI(Tl) scintillator whose 2093000100025 efficiency was calculated using theory from 2093000100026 the literature and checked with a standard 2093000100027 Na-22 source. Observations were made on the 2093000100028 photopeaks of the spectra and the peak-to- 2093000100029 total ratio for the crystal was determined 2093000100030 experimentally with monoenergetic gamma ray 2093000100031 emitters. 2093000100032 (SIBAR) Silicon surface barrier detector placed at 2093000100033 150 degrees to the incident deuterons to 2093000100034 monitor the neutron flux by detecting the 2093000100035 associated alphas. 2093000100036 MONITOR (1-H-3(D,N)2-HE-4,,DA) Associated particle. 2093000100037 CORRECTION .Corrections were made for- 2093000100038 1.gamma self-absorption. 2093000100039 2.Isotope decay scheme. 2093000100040 3.Finite size of neutron source. 2093000100041 In addition allowance was made by two methods for 2093000100042 any possible variation of neutron production rate 2093000100043 during the irradiation. 2093000100044 ERR-ANALYS (ERR-T) Total uncertainty includes: 2093000100045 (ERR-1) Error in geometry factor for alpha detection 2093000100046 (ERR-2) Error in absorption coefficient 2093000100047 (ERR-3) Error in peak-to-total ratio 2093000100048 (ERR-4) Error in absolute detection efficiency 2093000100049 (ERR-5) Error in separation of crystal and sample, 2093000100050 effect on 2093000100051 (ERR-6) Uncertainty in source size,effect on 2093000100052 (ERR-7) Error in average anisotropy 2093000100053 (ERR-8) Error in variation of anisotropy with angle 2093000100054 (ERR-9) Error in uncertainty in activation due to 2093000100055 source size 2093000100056 (ERR-10) Uncertainty in activation due to source- 2093000100057 sample separation and sample thickness 2093000100058 (ERR-11) Uncertainty due to neutron absorption paths 2093000100059 .In the article it is mentioned that summary of errors 2093000100060 and estimated values for the reaction 63Cu(n,2n)62Cu. 2093000100061 The errors quoted on the other cross-sections were 2093000100062 obtained in a similar manner but are somewhat larger, 2093000100063 due to increased statistical errors and uncertainties 2093000100064 in the decay schemes. 2093000100065 STATUS (TABLE) .Data from the text of JIN,31,1,1969. 2093000100066 HISTORY (19790530C) 2093000100067 (20150702A) SD:Updated to new date formats,lower case. 2093000100068 Corrections according last EXFOR rules and Dict. 2093000100069 DATA-ERR -> ERR-T. ERR-ANALYS update. COMMON section 2093000100070 in Subent 1 added. 2093000100071 ENDBIB 69 0 2093000100072 COMMON 11 6 2093000100073 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 2093000100074 ERR-7 ERR-8 ERR-9 ERR-10 ERR-11 2093000100075 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2093000100076 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2093000100077 0.94 0.7 2. 1. 2. 0.25 2093000100078 2. 1.4 1.1 0.2 0.5 2093000100079 ENDCOMMON 6 0 2093000100080 ENDSUBENT 79 0 2093000199999 SUBENT 20930002 20150702 22432093000200001 BIB 5 12 2093000200002 REACTION (29-CU-63(N,2N)29-CU-62,,SIG) 2093000200003 SAMPLE .Spectroscopically pure metal of thickness 0.01 cm 2093000200004 to 0.1 cm placed close behind the tritium target. 2093000200005 Target diameter about 0.25 times sample diameter. 2093000200006 Sample enclosed in sufficient thickness of Al to 2093000200007 absorb the positrons and localise the annihilation 2093000200008 radiation. 2093000200009 DECAY-DATA (29-CU-62,9.8MIN,B+,,0.972) Data from Nuclear Data B. 2093000200010 2-3-2 Natn.Acad.Sci.Res.Council,Washington DC, (1967).2093000200011 ERR-ANALYS (ERR-S) Counting errors (statistical) 2093000200012 (ERR-12) Uncertainty in decay scheme 2093000200013 HISTORY (20150702U) SD: ERR-ANALYS added. 2093000200014 ENDBIB 12 0 2093000200015 COMMON 2 3 2093000200016 ERR-S ERR-12 2093000200017 PER-CENT PER-CENT 2093000200018 0.95 1.5 2093000200019 ENDCOMMON 3 0 2093000200020 DATA 6 2 2093000200021 EN EN-RSL +EN-RSL -EN-RSL DATA ERR-T 2093000200022 MEV MEV MEV MEV MB MB 2093000200023 1.4700E+01 2.0000E-01 6.0300E+02 2.8000E+012093000200024 1.4800E+01 4.0000E-01 3.0000E-01 6.1500E+02 2.8000E+012093000200025 ENDDATA 4 0 2093000200026 ENDSUBENT 25 0 2093000299999 SUBENT 20930003 20150702 22432093000300001 BIB 5 13 2093000300002 REACTION (29-CU-65(N,2N)29-CU-64,,SIG) 2093000300003 SAMPLE Spectroscopically pure metal of thickness 0.01 cm 2093000300004 to 0.1 cm placed close behind the tritium target. 2093000300005 Target diameter about 0.25 times sample diameter. 2093000300006 Sample enclosed in sufficient thickness of Al to 2093000300007 absorb the positrons and localise the annihilation 2093000300008 radiation. 2093000300009 DECAY-DATA (29-CU-64,12.8HR,B+,,0.193) Data from Nuclear Data B. 2093000300010 2-3-2 Natn.Acad.Sci.Res.Council, Washington 2093000300011 D.C.,(1961). 0.5% error assumed in abundance. 2093000300012 ERR-ANALYS (ERR-12) Uncertainty in decay scheme 2093000300013 HISTORY (20150702A) SD: 26-CU-64 -> 29-CU-64 in DECAY-DATA. 2093000300014 ERR-ANALYS added. 2093000300015 ENDBIB 13 0 2093000300016 COMMON 1 3 2093000300017 ERR-12 2093000300018 PER-CENT 2093000300019 0.5 2093000300020 ENDCOMMON 3 0 2093000300021 DATA 4 1 2093000300022 EN EN-RSL DATA ERR-T 2093000300023 MEV MEV MB MB 2093000300024 1.4700E+01 2.0000E-01 9.5800E+02 5.4000E+01 2093000300025 ENDDATA 3 0 2093000300026 ENDSUBENT 25 0 2093000399999 SUBENT 20930004 20150702 22432093000400001 BIB 5 12 2093000400002 REACTION (42-MO-92(N,2N)42-MO-91-G,,SIG) 2093000400003 SAMPLE .Spectroscopically pure metal of thickness 0.01 cm 2093000400004 to 0.1 cm placed close behind the tritium target. 2093000400005 Target diameter about 0.25 times sample diameter. 2093000400006 Sample enclosed in sufficient thickness of Al to 2093000400007 absorb the positrons and localise the annihilation 2093000400008 radiation. 2093000400009 DECAY-DATA (42-MO-91-G,15.5MIN,B+,,0.94) From C.M.Lederer et al, 2093000400010 Table of Isotopes,6th Edn.,(1967). Error in 2093000400011 abundance assumed to be 1%. 2093000400012 ERR-ANALYS (ERR-12) Uncertainty in decay scheme 2093000400013 HISTORY (20150702U) SD: ERR-ANALYS added. 2093000400014 ENDBIB 12 0 2093000400015 COMMON 1 3 2093000400016 ERR-12 2093000400017 PER-CENT 2093000400018 1.0 2093000400019 ENDCOMMON 3 0 2093000400020 DATA 6 2 2093000400021 EN EN-RSL +EN-RSL -EN-RSL DATA ERR-T 2093000400022 MEV MEV MEV MEV MB MB 2093000400023 1.4700E+01 2.0000E-01 2.2200E+02 1.0000E+012093000400024 1.4800E+01 4.0000E-01 3.0000E-01 2.2700E+02 1.0000E+012093000400025 ENDDATA 4 0 2093000400026 ENDSUBENT 25 0 2093000499999 SUBENT 20930005 20150702 22432093000500001 BIB 5 9 2093000500002 REACTION (13-AL-27(N,A)11-NA-24,,SIG) 2093000500003 SAMPLE .Spectroscopically pure metal of thickness 0.01 cm 2093000500004 to 0.1 cm placed close behind the tritium target. 2093000500005 Target diameter about 0.25 times sample diameter. 2093000500006 DECAY-DATA (11-NA-24,15.HR,DG,1370.,1.0,DG,2750.,1.0) Data from 2093000500007 C.M.Lederer et al, Table of Isotopes,6th Edn., 2093000500008 (1967). Error assumed to be 1%. 2093000500009 ERR-ANALYS (ERR-12) Uncertainty in decay scheme 2093000500010 HISTORY (20150702U) SD: ERR-ANALYS added. 2093000500011 ENDBIB 9 0 2093000500012 COMMON 1 3 2093000500013 ERR-12 2093000500014 PER-CENT 2093000500015 1.0 2093000500016 ENDCOMMON 3 0 2093000500017 DATA 4 1 2093000500018 EN EN-RSL DATA ERR-T 2093000500019 MEV MEV MB MB 2093000500020 1.4700E+01 2.0000E-01 1.2100E+02 6.0000E+00 2093000500021 ENDDATA 3 0 2093000500022 ENDSUBENT 21 0 2093000599999 ENDENTRY 5 0 2093099999999