B. I. S. van der Ventel

Quasielastic neutrino-nucleus scattering

We study the sensitivity of neutral-current neutrino-nucleus scattering to the strange-quark content of the axial-vector form factor of the nucleon. A model-independent formalism for this reaction is developed in terms of eight nuclear structure functions. Taking advantage of the insensitivity of the ratio of proton (�,� ′ p) to neutron (�,� ′ n) yields to distortion effects, we compute all structure functions in a relativistic plane wave impulse approximation approach. Further, by employing the notion of a bound-state nucleon propagator, closed-form, analytic expressions for all nuclear-structure functions are developed in terms of an accurately calibrated relativistic meanfield model. Using a strange-quark contribution to the axial-vector form factor of g s = −0.19, a significant enhancement in the proton-to-neutron yields is observed relative to one with g s =0.

Strange-quark contribution to the ratio of neutral- to charged-current cross sections in neutrino-nucleus scattering

A formalism based on a relativistic plane-wave impulse approximation is developed to investigate the strange-quark content g{sub A}{sup s} of the axial-vector form factor of the nucleon via neutrino-nucleus scattering. Nuclear structure effects are incorporated via an accurately calibrated relativistic mean-field model. The ratio of neutral- to charged-current cross sections is used to examine the sensitivity of this observable to g{sub A}{sup s}. For values of the incident neutrino energy in the range proposed by the FINeSSE Collaboration and by adopting a value of g{sub A}{sup s}=-0.19, a 30% enhancement in the ratio is observed relative to the g{sub A}{sup s}=0 result.

Strange-particle production via the weak interaction

The differential cross sections for the neutrino-induced weak charged current production of strange particles in the threshold energy region are presented. The general representation of the weak hadronic current is newly developed in terms of eighteen unknown invariant amplitudes to parametrize the hadron vertex. The Born-term approximation is used for the numerical calculations in the framework of the Cabibbo theory and SU(3) symmetry. For unpolarized octet baryons four processes are investigated, whereas in the case of polarized baryons only one process is chosen to study the sensitivity of the differential cross section to the various polarizations of the initial-state nucleon and the final-state hyperon.

Quasifree eta photoproduction from nuclei and medium modifications of resonances

This paper establishes the case that the process of quasifree

Analysis of the multistrain asymmetric SI model for arbitrary strain diversity

\ensuremath{\eta}

The weak production of hypernuclei

photoproduction from nuclei is an important tool to study medium modifications and changes to the elementary process

Relativistic calculations of quasielastic proton-nucleus spin observables using a complete Lorentz invariant description of the NN scattering matrix

\ensuremath{\gamma}\stackrel{\ensuremath{\rightarrow}}{N}\ensuremath{\eta}N

Relativistic plane wave model for complete sets of spin transfer observables for exclusive proton-induced knockout reactions

in the nuclear medium. We investigate the sensitivity of the differential cross section, recoil nucleon polarization, and the photon asymmetry to changes in the elementary amplitude, medium modifications of the resonance

Photo- and Electroproduction of the Hypertriton on He-3

{(S}_{11}{,D}_{13})

Nuclear medium modifications of the NN interaction via quasielastic ({rvec p},{rvec p}{sup {prime}}) and ({rvec p},{rvec n}) scattering

masses, as well as nuclear target effects. All calculations are performed within a relativistic plane-wave impulse approximation formalism resulting in analytical expressions for all observables. Our results indicate that polarization observables are largely insensitive to nuclear target effects. Depending on the type of coupling, the spin observables do display a sensitivity to the magnitude of the