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AbstractAbstract
[en] The 14C(γ,p)13B reaction cross section has been measured from threshold to 29.1 MeV using bremsstrahlung photons. A contribution from the 14C(γ,pn+d)12B reactions is included, and is significant only at the highest energies measured here. The main features of the cross section are a weak resonance at ∼22.5 MeV and a dominant, broad resonance at ∼25.6 MeV. The integrated cross section up to 29.1 MeV is 17.9±3.2 MeV mb. We deduce that essentially the entire cross section results from decay of T> dipole states. In combination with the reported photoneutron cross section an estimate of the total photoabsorption cross section for 14C is obtained. The T< and T> components of the photoabsorption cross section (up to 30 MeV) are estimated to carry strengths of 92±14 MeV mb and 31-5+9 MeV mb, respectively. An isospin splitting of the giant dipole resonance of 8.1±0.2 MeV is obtained. Comparisons of several shell-model calculations are made with the data, and general agreement is found. A comparison of photoabsorption cross sections for 12,13,14C and 16,17,18O shows dramatic redistribution of dipole strength as neutrons are added to the core nuclei
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BARYONS, BETA DECAY, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BORON ISOTOPES, CATIONS, CHARGED PARTICLES, DECAY, ELEMENTARY PARTICLES, FERMIONS, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, IONS, ISOTOPES, LIGHT NUCLEI, MATHEMATICAL MODELS, NUCLEAR DECAY, NUCLEAR MODELS, NUCLEAR REACTIONS, NUCLEI, NUCLEONS, ODD-EVEN NUCLEI, PHOTONUCLEONS, PROTONS, RADIOISOTOPES, TARGETS
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