ENTRY A0235 20220331 A100A0235 0 1 SUBENT A0235001 20220331 A100A0235 1 1 BIB 13 66 A0235 1 2 TITLE Absolute cross sections for the production of 18F via A0235 1 3 the 18O(p,n)18F reaction A0235 1 4 AUTHOR (T.J.Ruth, A.P.Wolf) A0235 1 5 REFERENCE (J,RCA,26,21,1979) A0235 1 6 INSTITUTE (1USABNL) A0235 1 7 FACILITY (VDGT,1USABNL) A0235 1 8 (CYCLO,1USABNL) A0235 1 9 METHOD (EXTB,SITA,ACTIV,CHSEP,BCINT) A0235 1 10 The proton irradiations were performed on the A0235 1 11 Brookhaven tandem van de Graaff accelerator. Typically A0235 1 12 the irradiations were for 1.5-3.0 minutes duration A0235 1 13 and the beam currents were 100-300 nA. The specific A0235 1 14 details pertaining to the beam energy analysis, the A0235 1 15 beam focusing and collimator system, and Faraday cup A0235 1 16 have been reported previously see 'REL-REF'. The A0235 1 17 defocused proton beam was directed through a 1 cm A0235 1 18 collimator which had permanent magnets installed to A0235 1 19 suppress the secondary electrons produced in the A0235 1 20 collimator. A0235 1 21 SAMPLE The beam passed through a thin (5.46 mg/cm2, A0235 1 22 1/4 mil, 6.4 um) Havar foil, a small air path A0235 1 23 (~ 1.5 mg/cm2) and a Havar target window A0235 1 24 (6.44 mg/cm2) before entering the target gas. The A0235 1 25 total charge collected by the Faraday cup for each A0235 1 26 run was determined with calibrated current A0235 1 27 integrators. The target gas consisted of 91.7% A0235 1 28 enriched 18O-2 with a gross composition of 99.8% mole A0235 1 29 oxygen. The impurities consisted of 4.0% 17O and A0235 1 30 4.3% 16O in the form of either O-2 or CO-2. The CO-2 A0235 1 31 and N-2 impurities were less 0.1% each. A0235 1 32 The target chamber was constructed of Al and had A0235 1 33 valved filling ports. The cylindrical chamber was A0235 1 34 2.0 cm deep and 2.5 cm in diameter. Target pressures A0235 1 35 ranged between 200 and 600 Torr. The targets were A0235 1 36 loaded by way of a vacuum line equipped with a A0235 1 37 Barocell differential pressure transducer. A0235 1 38 A preliminary experiment indicated that less than 0.1% A0235 1 39 of the total activity remained in the gas phase in the A0235 1 40 Al targets. This was determined by passing the A0235 1 41 irradiated 18O2 target gas through a charcoal trap A0235 1 42 at liquid n2 temperature and counting the activity A0235 1 43 trapped. In subsequent irradiations the gas was vented A0235 1 44 and the target opened for removal of the 18F activity. A0235 1 45 ADD-RES 1.Chemical separation method. A0235 1 46 2.Saturation yield curve. A0235 1 47 DETECTOR (NAICR) A0235 1 48 ANALYSIS (DECAY) The only activities present were the 18-F A0235 1 49 and 13-N produced from the (p,alpha) reaction on the A0235 1 50 4.3% 16-O present. A0235 1 51 ERR-ANALYS (ERR-1) The uncertainty in the disintegration A0235 1 52 rate, which combines the effect of the counting A0235 1 53 statistics (1% approximately) and the decay A0235 1 54 curve analysis (less 3%). A0235 1 55 (ERR-2,,1.) Beam current integration uncertainty. A0235 1 56 (ERR-3,,2.) Maximum uncertainty due to effect of any A0235 1 57 fluctuations in the intensity. A0235 1 58 (ERR-4,,1.) The upper limit uncertainty in the number A0235 1 59 of target nuclei. A0235 1 60 (ERR-5) The error of chemical transfer of 18-F. A0235 1 61 REL-REF (N,,R.Colle+,J,PR/C,9,1819,1974) Experimental details. A0235 1 62 HISTORY (19850212C) A0235 1 63 (19850228A) A0235 1 64 (20220331A) SD:Updated to new date formats,lower case. A0235 1 65 Corrections in all Subents. ERR-ANALYS updated. A0235 1 66 DATA-ERR1->ERR-1; DATA-ERR2->ERR-2; DATA-ERR3->ERR-3; A0235 1 67 DATA-ERR4 -> ERR-4; DATA-ERR5 -> ERR-5. A0235 1 68 ENDBIB 66 0 A0235 1 69 COMMON 3 3 A0235 1 70 EN-ERR ERR-1 ERR-5 A0235 1 71 MEV PER-CENT PER-CENT A0235 1 72 0.1 3. 2. A0235 1 73 ENDCOMMON 3 0 A0235 1 74 ENDSUBENT 73 0 A0235 199999 SUBENT A0235002 20220331 A100A0235 2 1 BIB 8 15 A0235 2 2 REACTION (8-O-18(P,N)9-F-18,,SIG) A0235 2 3 DECAY-DATA (9-F-18,109.8MIN,AR,511.,2.) A0235 2 4 FLAG (1.) This datum was determined at the BNL 60-inch A0235 2 5 cyclotron using the same Faraday cup assembly. A0235 2 6 ERR-ANALYS (ERR-T) The total uncertainty in the cross sections A0235 2 7 determined by combining the errors in quadrature. A0235 2 8 COMMENT /By authors/. The energy of the irradiation was taken A0235 2 9 as the mid-point in the range of the protons in the A0235 2 10 target gas. A0235 2 11 REL-REF (A,C1016001,J.D.Anderson+,J,PR,177,1416,1969) A0235 2 12 (A,D0095001,J.P.Blaser+,J,HPA,24,465,1951) A0235 2 13 (D,,J.P.Blaser+,J,HPA,22,598,1949) A0235 2 14 STATUS (TABLE) Tbl.2 from Radiochim.Acta 26(1979)21 A0235 2 15 HISTORY (20220331A) SD: SF5=IND and SF9=EXP deleted from A0235 2 16 REACTION code. A0235 2 17 ENDBIB 15 0 A0235 2 18 COMMON 1 3 A0235 2 19 ERR-T A0235 2 20 PER-CENT A0235 2 21 5. A0235 2 22 ENDCOMMON 3 0 A0235 2 23 DATA 3 35 A0235 2 24 EN DATA FLAG A0235 2 25 MEV MB NO-DIM A0235 2 26 2.30 47. A0235 2 27 2.30 34. A0235 2 28 3.20 24. A0235 2 29 3.35 89. A0235 2 30 4.31 298. A0235 2 31 4.59 208. A0235 2 32 4.86 171. A0235 2 33 5.13 697. A0235 2 34 5.25 571. A0235 2 35 5.31 617. A0235 2 36 5.31 580. A0235 2 37 5.67 410. A0235 2 38 5.72 188. A0235 2 39 6.20 381. A0235 2 40 6.36 199. A0235 2 41 6.43 367. A0235 2 42 6.45 356. A0235 2 43 6.85 245. A0235 2 44 7.00 162. A0235 2 45 7.00 156. A0235 2 46 7.52 224. A0235 2 47 8.04 174. A0235 2 48 9.08 114. A0235 2 49 9.08 112. A0235 2 50 10.11 147. A0235 2 51 10.63 133. A0235 2 52 11.14 116. A0235 2 53 11.65 162. 1. A0235 2 54 11.65 158. 1. A0235 2 55 11.65 134. A0235 2 56 11.65 111. A0235 2 57 12.16 103. A0235 2 58 13.18 89. A0235 2 59 13.69 43. A0235 2 60 14.71 41. A0235 2 61 ENDDATA 37 0 A0235 2 62 ENDSUBENT 61 0 A0235 299999 ENDENTRY 2 0 A023599999999