Pharmacy (Section Np)

Np Cross Section for Big Bang Nucleosynthesis

The total cross sections for the radiative neutron capture on a proton, np → dγ, and its inverse reaction dγ → np are evaluated at the big bang nucleosynthesis (BBN) energies. We employ the effective field theory with dibaryon field to describe the two-nucleon reactions with external electromagnetic probe. Electromagnetic transition amplitudes are obtained up to next-to leading order. Our resul...

Fission Cross - Section Measurements of the Odd - Odd Isotopes 232 Pa , 238 Np , and 236 Np

Transmutation of actinide waste into fission products could be enhanced by using resonance fISsion of odd-odd target materials; those of interest are mpa, 238Np, and u2Am. Fission cross-section . measurements of two of these short-lived materials were performed at Los Alamos National Laboratory. Samples were produced by the (d,2n) reaction in the Los Alamos Ion Beam Facility followed by fast ra...

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Pharmacy.

NP-Completeness and Disjoint NP-Pairs

We study the question of whether the class DisjNP of disjoint pairs (A,B) of NPsets contains a complete pair. The question relates to the question of whether optimal proof systems exist, and we relate it to the previously studied question of whether there exists a disjoint pair of NP-sets that is NP-hard. We show under reasonable hypotheses that nonsymmetric disjoint NP-pairs exist, which provi...