ENTRY D0451 20080729 D062D045100000001 SUBENT D0451001 20080729 D062D045100100001 BIB 13 40 D045100100002 TITLE Production of carrier-free 28Mg by 50 - 200 MeV D045100100003 protons on natCl: Excitation function and target D045100100004 optimization D045100100005 AUTHOR (G.F.Steyn,N.P.Van Der Meulen,T.N.Van Der Walt, D045100100006 C.Vermeulen) D045100100007 INSTITUTE (3SAFITH) D045100100008 REFERENCE (C,2007NICE,2,1391,2007) D045100100009 FACILITY (CYCLO) The separated sector cyclotron of iThemba LABS.D045100100010 SAMPLE The NaCl(> 99%, Merck) target discs had thicknesses of D045100100011 nominally 870, 540 and 425 mg/cm2, respectively, in D045100100012 the 200, 100 and 66 MeV stacks. The individual NaCl D045100100013 discs were separated by relatively thin monitor foils D045100100014 (99.9%, Goodfellow, U.K.): 65 mg/cm2 Al in the 200 D045100100015 and 100 MeV stacks and 44 mg/cm2 Cu in the 66 MeV D045100100016 stack. D045100100017 MONITOR (13-AL-27(P,X)11-NA-22,,SIG) D045100100018 (29-CU-0(P,X)30-ZN-65,,SIG) D045100100019 MONIT-REF (,K.GUL+,R,IAEA-TECDOC-1211,49,2001) D045100100020 METHOD (ACTIV,GSPEC,STTA) D045100100021 DETECTOR (HPGE) An accurately calibrated HPGe detector with a D045100100022 relative efficiency of 13% and a resolution of 1.8 D045100100023 keV at 1.33 MeV, connected to a Silena EMCAPLUS D045100100024 multi-channel analyser, was used for all activity D045100100025 measurements. D045100100026 ERR-ANALYS (ERR-T) The total uncertainties of the measured D045100100027 activity values were obtained by summing all the D045100100028 contributing uncertainties in quadrature and are D045100100029 expressed with a sigma(68%) confidence level. The D045100100030 statistical uncertainties were insignificant D045100100031 compared to the systematic uncertainty, except near D045100100032 threshold, the latter of which was estimated to be D045100100033 about 7%: D045100100034 (ERR-1) beam current integration(3%), D045100100035 (ERR-2) detector e ciency (5%), D045100100036 (ERR-3) counting geometry (1%), D045100100037 (ERR-4) decay corrections (2%) and D045100100038 (ERR-5) target thickness (3%). D045100100039 STATUS (TABLE) Data from tbl.1 of the article D045100100040 HISTORY (20070816C) D045100100041 (20080724A) SD. Reference on Conf.Proc. was corrected. D045100100042 ENDBIB 40 0 D045100100043 COMMON 5 3 D045100100044 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 D045100100045 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT D045100100046 3.0 5.0 1.0 2.0 3.0 D045100100047 ENDCOMMON 3 0 D045100100048 ENDSUBENT 47 0 D045100199999 SUBENT D0451002 20070816 D055D045100200001 BIB 1 1 D045100200002 REACTION (17-CL-0(P,X)12-MG-28,,SIG) D045100200003 ENDBIB 1 0 D045100200004 NOCOMMON 0 0 D045100200005 DATA 3 30 D045100200006 EN DATA ERR-T D045100200007 MEV MICRO-B MICRO-B D045100200008 50. 0.41 0.07 D045100200009 55. 5.9 0.5 D045100200010 60. 13.2 0.9 D045100200011 65. 21.1 1.5 D045100200012 70. 28.4 2.0 D045100200013 75. 34.6 2.4 D045100200014 80. 39.6 2.8 D045100200015 85. 43.8 3.1 D045100200016 90. 47.4 3.3 D045100200017 100. 55.3 3.9 D045100200018 105. 60.0 4.2 D045100200019 110. 65.4 4.6 D045100200020 115. 71.3 5.0 D045100200021 120. 77.5 5.4 D045100200022 125. 83.7 5.9 D045100200023 130. 89.7 6.3 D045100200024 135. 95.3 6.7 D045100200025 140. 100.4 7.0 D045100200026 145. 105.2 7.4 D045100200027 150. 109.9 7.7 D045100200028 155. 114.5 8.0 D045100200029 160. 119.4 8.4 D045100200030 165. 124.4 8.7 D045100200031 170. 129.7 9.1 D045100200032 175. 134.7 9.4 D045100200033 180. 139.2 9.7 D045100200034 185. 142.8 10.0 D045100200035 190. 145.3 10.2 D045100200036 195. 147.6 10.3 D045100200037 200. 152.3 10.7 D045100200038 ENDDATA 32 0 D045100200039 ENDSUBENT 38 0 D045100299999 ENDENTRY 2 0 D045199999999