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The effects of symmetry breaking on the multiplet structure of composite particles are studied. The Sakata triplet is used for illustrations, and simple special models are studied where some mass regularities remain even in the presence of a fairly large symmetry breaking.
A theory of multipole mixtures applicable to resonance absorption is developed. The method used is an extension of Malus' law to include elliptically polarized multipole mixtures. The case of dipole-quadrupole mixtures is treated in detail as a means of measuring E 2 M 1 mixing ratios and...
It is shown for the third-order triangle and the fourth-order box Feynman diagrams that singularities exist on the physical boundaries of the amplitudes if, and only if, the external momenta are such as to allow the reactions to actually proceed with real intermediate particles. If, furthermore,...
The reaction K ( π ) + P → Y + B is considered, in which Y is a spin-½ hyperon and B is a spin- ℓ boson which decays into two spin-zero bosons. Taking into account the consequences of parity conservation in the production process, the structure of the joint decay distribution of Y and B is...
A study has been made of the nuclear spins I and hyperfine structures of several radioactive isotopes in the rare-earth region. The nuclear-spin determinations are Pr 143 ( I = 7 2 ) , Nd 149 ( I = 5 2 ) , Tb 161 ( I = 3 2 ) , Ho 161 ( I = 7 2 ) , and Er 165 ( I = 5 2 ) . The measured hyperfine...
The validity of the Bardeen-Cooper-Schrieffer variational method is re-examined for two nuclear-model cases, one resembling the system of deformed nuclei and the other spherical nuclei. For simplicity, a constant-pairing-force approximation is adopted. The projected BCS wave functions compare...
The connection between the nonrelativistic (Wolfenstein-Ashkin) and the relativistic (Goldberger-Grisaru-MacDonald-Wong) amplitudes of the nucleon-nucleon scattering is obtained using a two-component form of the latter. This connection involves simple functions of E and cos θ . It is then...
The total neutron cross section of N 15 has been measured for energies from 0.45 to 2.20 MeV. Neutrons with energy spreads between 15 and 30 keV were produced by the Li 7 ( p , n ) Be 7 or T ( p , n ) He 3 reaction with protons from a Van de Graaff accelerator. Resonances were observed in the...
The zeroth approximation of a modified perturbation theory of photons and electrons is constructed by the application of Salam's gauge technique.
An 0.620-MeV β - branch has been observed to compete with the previously reported gamma decay from the 3.14-h Y 9 0 m . The calculated values, derived from the shell model for the branching ratio ( 0.620 - MeV β - ) ( 0.482 - MeV γ ) = 1.16 × 10 - 3 and the log ft (7.54) are compared with the...
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