YIELD MEASUREMENTS FOR THE B-11(P,N)C-11 AND THE B-10(D,N)C-11 NUCLEAR-REACTIONS

The yields from the B-11(p,n)C-11 nuclear reactions have been measured over the energy range of 0-28.6 MeV. The yields from the B-10(d,n)C-1 1 nuclear reactions have been measured over the energy range of 0-21.5 MeV. Cross section values were derived from the yield data. The yield measurements were carried out on sealed samples of boron powder isoto pically enriched to greater than 93%. The target holders were construc ted of aluminum and each contained 50 mg of boron powder to achieve hi gh energy resolution, but with sufficient material to ensure accurate cross-section measurements. C-11 yields were determined by decay-curve analysis. Our data show that at energies below 5 MeV, the B-11(p,n)C- 11 nuclear reaction can be expected to produce 250 mCi of C-11 (based on a 30 min irradiation at a beam current of 100 mu A). (C) 1998 Elsev ier Science Inc.