4 research outputs found
Relativistic plane wave description of spin transfer observables for proton knockout reactions
Thesis (PhD)--Stellenbosch University, 2001.ENGLISH ABSTRACT: In this dissertation we set out to develop the first relativistic model for calculating complete
sets of (p, 2p) spin transfer observables. In addition to this a new technique has been developed
which allows us to evaluate the transition amplitude, which is used to calculate the scattering
observables for the reaction directly. The influence of various modiuin-modificd parameters ()1I
the scattered wave functions anr] NN interact ion lH-IVC' })('('11 invest igatcd DlIC t,C) (I,llIlJigllitic's
surrounding the nNN coupling we have included both pseudosoalar and pseudovector coupling
into the nucleon-nucleon interaction model. Furthermore we have included two different kinematic
prescriptions to obtain the effective NN laboratory kinetic energy and center of mass
scattering angle, which are used to obtain the NN scattering amplitudes. The aim of this
study is to investigate the effects of the various model parameters on complete sets of scattering
observables.
Our investigation has shown that although the analyzing power is not very sensitive to nuclear
medium effects, and the various other spin transfer observables such as Dnn should provide
valuable insight. Further refinements of the model would be to include nuclear distortions as
well as the IA2 model of the NN interaction.AFRIKAANSE OPSOMMING: In hierdie tesis ontwikkel ons die eerste relatiwistiese model vir die berekening van 'n volledige
stel (p, 2p) spin waarneembares. Verder word 'n nuwe tegniek ingevoer wat ons toelaat om die
oorgangsamplitude, wat gebruik word in berekening van die verstrooings waarneembares vir
die reaksie, direk te evalueer. Die invloed van verskeie medium-gemodifiseerde parameters op
die verstrooide golffunksies en die NN wisselwerking word bestudeer. As gevolg van onsekerhede
betreffende die лNN koppeling word beide die pseudoskalaar en pseudovektor koppeling
in die nukleon-nukleon interaksie model ingesluit. Ons sluit ook twee verskillende kinematiese
preskripsies in om die effektiewe NN laboratorium kinetiese energie en die massa middelpunt
verstrooiings hoek, wat gebruik word vir die berekening van die NN verstrooiings amplitude,
te bereken. Die doel van hierdie studie is om die effek van verskeie model parameters op 'n
volledige stel spin waarneembares te ondersoek.
Die studie toon dat alhoewel die analiseervermoë nie baie sensitief is vir medium effekte
nie, die ander spin waarneembares soos byvoorbeeld Dnn waardevolle insig lewer. Daar word
voorgestel dat die model verfyn word deur kerndistorsies as ook die meer algemele IA2 model
vir die NN interaksie in te sluit
Relativistic versus nonrelativistic models of polarized proton-induced knockout reactions
One copy microfiche.Thesis (M. Sc.) -- University of Stellenbosch, 1998.Full text to be digitised and attached to bibliographic record
Paarl Africa Underground Laboratory (PAUL)
International audienceEstablishing a deep underground physics laboratory to study, amongst others, double beta decay, geoneutrinos, reactor neutrinos and dark matter has been discussed for more than a decade within the austral African physicists' community. PAUL, the Paarl Africa Underground Laboratory, is an initiative foreseeing an open international laboratory devoted to the development of competitive science in the austral region. It has the advantage that the location, the Huguenot tunnel, exists already and the geology and the environment of the site is appropriate for an experimental facility. The paper describes the PAUL initiative, presents the physics prospects and discusses the capacity for building the future experimental facility
Paarl Africa Underground Laboratory (PAUL)
International audienceEstablishing a deep underground physics laboratory to study, amongst others, double beta decay, geoneutrinos, reactor neutrinos and dark matter has been discussed for more than a decade within the austral African physicists' community. PAUL, the Paarl Africa Underground Laboratory, is an initiative foreseeing an open international laboratory devoted to the development of competitive science in the austral region. It has the advantage that the location, the Huguenot tunnel, exists already and the geology and the environment of the site is appropriate for an experimental facility. The paper describes the PAUL initiative, presents the physics prospects and discusses the capacity for building the future experimental facility