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The range of high-energy nucleon-nucleon interactions is examined in a simple single inelastic channel model which consists of the production of two spinless isobars. An almost transparent, purely absorbing optical approximation is made, in which case both the inelastic and elastic angular...
Fission fragment kinetic energy spectra of Cf 246 , Cf 248 , and Cf 254 were measured by comparison to Cf 252 . The most probable fragment energies were (in MeV): Cf 246 , 84.8±1.3 and 110.8±1.5; Cf 248 , 81.6±0.9 and 107.1±0.8; Cf 254 , 83.0±2 and 103.1±2.
The general theory of the dynamical motion and gamma-ray cross section for a single impurity nucleus harmonically coupled to an arbitrary collection of N atoms is developed in supermatrix representation. The relevant properties of the system are expressed in terms of a functional matrix f 0 ( Ω...
Asymptotic integral invariants are constructed for the electromagnetic and gravitational fields. The integrals are taken over closed two-dimensional surfaces embedded in a null hypersurface. In the absence of incoming radiation, the asymptotic behavior of the electromagnetic field F ab and the...
Making use of the impulse approximation and the one-nucleon dispersion theoretical amplitudes, a theoretical expression for the differential cross section of the process e + d → e + d + π 0 has been calculated. An experiment which would be useful in the investigation of the nucleon form...
The correction to the Fermi approximation for the cross section is calculated for slow neutron scattering from a proton bound in a harmonic potential. For neutron energies up to fifteen times thermal energy, and for energy transfer due to proton transitions between the ground state and first...
A generalization of Levinson's theorem is proved. The proof requires that the elastic partial-wave scattering amplitude satisfy a dispersion relation, and that the N D integral equation be of Fredholm type with nonzero determinant. Inelastic processes are taken into account fully by means of a...
The leading singularity in the complex angular momentum plane is studied for certain sets of Feynman graphs. Two models are considered: (a) the ladder graphs in the λ ϕ 4 theory in which bubbles are exchanged, and (b) the ladder graphs for the scattering of two scalar mesons by vector meson...
The coupled electron-phonon system is considered for phonon spectra of Einstein and Debye forms. The single-particle electron Green's function G is calculated in a nonperturbative manner in both models, and its spectral weight function is examined to determine the validity of a quasiparticle...
The problem of the localization of a magnetic moment around an impurity is formulated in a rotationally invariant way, making possible the calculation of the Curie constant. This calculation is carried out in lowest order, but, in principle, can be extended to arbitrary order.
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