ENTRY C1122 20170927 C171C112200000001 SUBENT C1122001 20170927 C171C112200100001 BIB 10 53 C112200100002 TITLE The C(alpha,X)11C cross sections at 1.59 and 4.19 GeV C112200100003 AUTHOR (J.V.Geaga,M.M.Gazzaly,G.J.Igo,J.B.McClelland, C112200100004 M.A.Nasser,A.L.Sagle,H.Spinka,J.B.Carroll, C112200100005 J.B.Mccaslin,V.Perez-Mendez,A.R.Smith,E.T.B.Whipple) C112200100006 REFERENCE (J,NP/A,386,589,1982) C112200100007 #doi:10.1016/0375-9474(82)90038-0 C112200100008 INSTITUTE (1USACLA,1USABRK) C112200100009 FACILITY (SYNCH,1USABRK) The Lawrence Berkeley Laboratory C112200100010 Bevalac. C112200100011 DETECTOR (NAICR) The gamma-ray spectrometer itself consisted C112200100012 of a 20.32 cm diameter by 10.16 cm thick NaI(Tl) C112200100013 crystal coupled through a linear amplifier to a 1600 C112200100014 channel pulse height analyzer. C112200100015 (TELES,SCIN,SCIN) For alpha detection. C112200100016 (IOCH) Ion chambers ICl-3: The readout from these C112200100017 chambers provided a monitor for the stability of the C112200100018 beam at the high intensities. These ion chamber C112200100019 readings were also used to record the time C112200100020 distribution of the incident beam during the course of C112200100021 a given irradiation. C112200100022 SAMPLE A polystyrene target consisted of a 3.81 cm diameter C112200100023 circular disk which was closely fitted inside a C112200100024 circular annulus whose diameter was 7.62 cm. The C112200100025 pieces were constructed to have parallel faces and a C112200100026 nominal thickness of 1.57 mm. The carbon content C112200100027 (12C+13C) of polystyrene is 91.5% carbon by weight. C112200100028 Each graphite target block had nominal dimensions of C112200100029 (5.1 x 5.1x2.54 cm3). The dimensions and weight of C112200100030 each graphite target used were measured and recorded. C112200100031 METHOD (EXTB,ACTIV) The duration of the entire irradiation C112200100032 procedure was about 3-4 hours. During the C112200100033 irradiations, the beam position and intensity were C112200100034 visually monitored on a pulse-by-pulse basis, and the C112200100035 accumulated incident flux was manually recorded after C112200100036 every 10 spills. The 11C was counted using a NaI(Tl) C112200100037 gamma-ray spectrometer. An irradiated polystyrene C112200100038 target was sandwiched between a pair of 0.157 cm C112200100039 thick copper plates, an the gamma rays from the C112200100040 annihilation of the beta+ from the 11C decay were C112200100041 measured in the spectrometer. The central disk and C112200100042 the annulus of each polystyrene target were counted C112200100043 separately. C112200100044 ERR-ANALYS (ERR-T) Systematic plus statistical. The errors in C112200100045 the cross section are dominated by possible counting C112200100046 losses in the two scintillator system and effects due C112200100047 to slight misalignment of the beam. C112200100048 (ERR-1) Possible counting losses as reflected by the C112200100049 difference in counts between the two sets of C112200100050 electronics never amounted to more than 2%. C112200100051 (ERR-2) An error contribution of 2% was assigned to C112200100052 allow for possible slight misalignment of the beam C112200100053 during irradiation. C112200100054 HISTORY (20170927C) BP C112200100055 ENDBIB 53 0 C112200100056 COMMON 2 3 C112200100057 ERR-1 ERR-2 C112200100058 PER-CENT PER-CENT C112200100059 2.0 2.0 C112200100060 ENDCOMMON 3 0 C112200100061 ENDSUBENT 60 0 C112200199999 SUBENT C1122002 20170927 C171C112200200001 BIB 2 2 C112200200002 REACTION (6-C-0(A,X)6-C-11,,SIG) C112200200003 STATUS (TABLE) pages 595-596. C112200200004 ENDBIB 2 0 C112200200005 NOCOMMON 0 0 C112200200006 DATA 3 2 C112200200007 EN DATA ERR-T C112200200008 GEV MB MB C112200200009 1.59 46.4 1.3 C112200200010 4.19 42.5 1.1 C112200200011 ENDDATA 4 0 C112200200012 ENDSUBENT 11 0 C112200299999 ENDENTRY 2 0 C112299999999