Abstract for seminar by Ian Cloet (CSSM-Jefferson Lab.)
Ian Cloet
CSSM-Jefferson Lab.
Wednesday, December 14th
Seminar Room, First Floor, Physics, University of Adelaide
The discovery in the early 80's by the European Muon Collaboration
(EMC) that nuclear structure functions differ substantially from
those of free nucleons caused a shock in the nuclear community. A
few years later the EMC discovered the so-called ``spin crisis',
where it was found that the fraction of the spin of the proton
carried by its quarks is unexpectedly small. With this background
it is surprising that in the 18 years since the discovery of the
spin crisis, there has been no experimental and little theoretical
investigation of the spin-dependent structure functions of atomic
nuclei.
In this talk we present results for the spin-dependent structure
functions of atomic nuclei and nuclear matter. The quark degrees
of freedom in nuclei are accessed via the convolution formalism,
where the nucleon bound state is obtained by solving the relativistic
Faddeev equation, and a relativistic shell model is used to model
the atomic nucleus. We find the exciting result that the medium
modifications to the polarized structure functions is about twice
that of the unpolarized case.
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