[Jlab-seminars] Physics Seminar

[Luci Collins]

*Physics Seminar
Friday, Aug. 16th
CEBAF Center AUD.
11:00AM
Cookies and coffee at 10:45AM*

*
Wim Cosyn
University of Ghent

"Mass Dependence and Scaling Properties of Nuclear Short-range Correlations"*

An approximate method to quantify the mass dependence of the number of
two- and three-nucleon (3N) short-range correlations (SRC) in nuclei is
suggested. The proposed method relies on the concept of the "local
nuclear character" of the SRC. We quantify the SRC by computing the
number of independent-particle model (IPM) nucleon pairs and triples
which reveal beyond-mean-field behavior. It is argued that those can be
identified by counting the number of nucleon pairs and triples in a
zero relative orbital momentum state. We find that the relative
probability per nucleon for 2N SRC follows a power law as a function of
the mass number A. The predictions are connected to measurements which
provide access to the mass dependence of SRC. First, the ratio of the
inclusive inelastic electron scattering cross sections of nuclei to
$^{2}$H and $^{3}$He at large values of the Bjorken variable.
Corrections stemming from the center-of-mass motion of the pairs are
estimated. Second, the EMC effect, for which we find a
linear relationship between its magnitude and the predicted number of
SRC-prone pairs. Third, we investigate the scaling properties of the
exclusive electroinduced two-nucleon knockout reaction $A(e, e pN )$.
The scaling function corresponds with the conditional center-of-mass
(c.m.) momentum distribution for close-proximity pairs in a state with
zero relative orbital momentum and zero radial quantum number. The width
of this conditional c.m. momentum distribution is larger than the one
corresponding with the full c.m. momentum distribution.






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