ENTRY C0056 20040310 0000C005600000001 SUBENT C0056001 20040310 0000C005600100001 BIB 9 22 C005600100002 INSTITUTE (2UK LVP) C005600100003 REFERENCE (J,NP/A,109,689,1968) C005600100004 AUTHOR (P.T.Andrews,P.G.Butler,A.Christy,A.N.James,P.Kirkby, C005600100005 B.G.Lowe,B.W.Renwick) C005600100006 TITLE Measurement of the Production Cross Section of 11C fromC005600100007 Natural Carbon for 385 MeV Protons. C005600100008 FACILITY (SYNCH,2UK LVP) C005600100009 SAMPLE 42-millimeter diameter polystyrene discs of naton 136. C005600100010 Various targets of four nominal thicknesses, 50, 250, C005600100011 375, and 625 mg/cm2. 92.3% carbon. C005600100012 METHOD (BCINT) Faraday cup C005600100013 4pi beta-gamma counting C005600100014 DETECTOR (SCIN) After bombardment, the naton-136 target was C005600100015 placed between two other naton-136 discs, 6-mm thick. C005600100016 The three scintillators were coupled to a 56avp C005600100017 photomultiplier and enclosed in an aluminum can. C005600100018 (NAICR) The 4pi beta counter was mounted within a few C005600100019 centimeters of a 7-cm diameter by 5-cm NaI gamma C005600100020 counter. C005600100021 HISTORY (19800213C)TWB C005600100022 (19840319A) Reference date corrected. C005600100023 (20040310A) Converted to new date formats. C005600100024 ENDBIB 22 0 C005600100025 NOCOMMON 0 0 C005600100026 ENDSUBENT 25 0 C005600199999 SUBENT C0056002 20040310 0000C005600200001 BIB 6 30 C005600200002 REACTION (6-C-0(P,X)6-C-11,,SIG) C005600200003 Authors assumed target to be pure carbon-12 for C005600200004 purposes of calculations. C005600200005 ANALYSIS Measurements were taken for six separate 5-minute C005600200006 intervals after the bombardment. From these six C005600200007 measurements, three values of the cross section were C005600200008 calculated for each bombardment. C005600200009 Seventeen measurements were made using different beam C005600200010 intensities and target thicknesses. All measurements C005600200011 were consistent to within the statistical uncertainty C005600200012 of 1%. C005600200013 Activity produced by neutrons from the synchrocyclotronC005600200014 and collimators was not detectable at the level of C005600200015 0.01% of the proton-induced activity. C005600200016 DECAY-DATA (6-C-11,20.34MIN,B+,960.,1.,AR,511.,1.) C005600200017 ERR-ANALYS (DATA-ERR) Allowing for 1% statistical uncertainty, C005600200018 less than 0.5% uncertainty from Compton scattering, C005600200019 about 0.5% uncertainties in the efficiency and C005600200020 calibration of the Faraday cup, and uncertainties of C005600200021 about 0.2% arising from the target thickness, the C005600200022 time constant, timing errors, and beam fluctuations. C005600200023 Systematic uncertainties from secondary particle C005600200024 interactions in the target, losses of carbon-11 duringC005600200025 and after the bombardment, and gas loss of carbon-11 C005600200026 were expected to be much less than 1 per-cent and wereC005600200027 neglected. C005600200028 REL-REF (R,C0057002,KAVANAGH+,J,CJP,42,1429,1964) Decay data. C005600200029 (A,B0101002,CRANDALL+,J,PR,101,329,1959) Present data C005600200030 agrees with this work. C005600200031 HISTORY (19840319A) REL-REF dates corrected. C005600200032 ENDBIB 30 0 C005600200033 NOCOMMON 0 0 C005600200034 DATA 3 1 C005600200035 EN DATA DATA-ERR C005600200036 MEV MB MB C005600200037 385. 36.7 0.6 C005600200038 ENDDATA 3 0 C005600200039 ENDSUBENT 38 0 C005600299999 ENDENTRY 2 0 C005699999999