A.D. Jackson

A MODIFIED SKYRMION

Abstract The Skyrme effective lagrangian is generalized to include a term simulating the effects of ω mesons. With this generalization, it is possible to reproduce a number of properties of single baryons and of the central NN interaction in a manner which is both qualitatively appealing and quantitatively satisfactory.

THE NUCLEON AS A TOPOLOGICAL CHIRAL SOLITON

Abstract We consider a version of the chiral bag model in which the interior quark sector is joined to an exterior meson sector through the requirement of continuity of the axial vector current at the bag surface. The negative energy quark sea plays a crucial role in this model, which reduces to the Skyrme soliton in the limit as the bag radius R→0. The “leakage” of baryon number and energy through the bag results in a remarkable insensitivity of these quantities to the bag radius. Although low-energy phenomenology should display a similar insensitivity, we suggest that a bag radius of 0.44 fm is advantageous on technical grounds. This choice of R should minimize the importance of gluon corrections, vacuum fluctuation effects, and inherent uncertainties in the effective lagrangian.

Landau parameters for nuclear matter using the Skyrme interaction

Abstract Landau parameters for nuclear matter are calculated for several Skyrme interactions. Resulting values of G o and G ′ o are in disgreement with empirical values and lead to instability against spin collapse in several cases. A suitable generalization of the interaction is suggested to overcome these difficulties.

PION EXCHANGE CURRENTS IN ELASTIC ELECTRON DEUTERON SCATTERING

The effects of pion-exchange pari and recoil currents on the electromagnetic form factors of the deuteron are calculated. Both exchange currents give significant contributions to the charge form factor and, despite some cancellation, their net effect is appreciable for q2 ⩾ 10 fm−2.

TWO PHASE MODELS OF BARYONS AND THE CHIRAL CASIMIR EFFECT

Abstract Sea quark contributions to the energy and the axial vector current are calculated in the framework of the chiral bag model. Logarithmic divergences in these quantities are eliminated by the requirement that the axial vector current remain finite in the limit as the bag radius, R , goes to zero and the chiral angle, θ ( R ), goes to π. This requirement permits the smooth joining of the quark phase inside the bag to a solitonic meson phase outside the bag and leads to a pure solitonic description of baryons in the R →0 limit.

TRITON CALCULATIONS IN A HARMONIC OSCILLATOR BASIS WITH REALISTIC POTENTIALS.

Abstract Using the Reid potential and a basis of translationally invariant harmonic oscillator states of good particle permutation symmetry the binding energy of the triton is calculated to be 6.30 MeV.

An explanation for the 0+ excited pairing state in actinide nuclei☆

Abstract The existence of more than one collective 0 + state in deformed nuclei due to the separation of ‘oblate’ and ‘prolate’ matrix elements is demonstrated by means of a model calculation and calculations using 240 Pu single particle wave functions.

3H and 3He form factors with the Reid potential

Abstract Electromagnetic form factors for 3 H and 3 He are calculated with the Reid potential and found to be in agreement with experimental data.

Effective mass enhancement and the imaginary part of the optical potential in nuclear matter

Abstract We demonstrate that the Correlated Basis Function (CBF) approach allows for an efficient quantitative determination of the optical-model potential in nuclear matter.

Approximate D-states and meson exchange currents

Abstract A simple approximate form for the [21] D-state component of the 3-nucleon ground state wave function, which has correct asymptotic behaviour is introduced and compared to a previously used form. We discuss the implications of approximate D-state wave functions in evaluation of meson exchange current effects.