Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Final-state interactions in two-nucleon knockout reactions   Background: Exclusive two-nucleon knockout after electroexcitation of nuclei
($A(e,e'NN)$ in brief) is considered to be a primary source of information
about short-range correlations (SRC) in nuclei. For a proper interpretation of
the data, final-state interactions (FSI) need to be theoretically controlled.
  Purpose: Our goal is to quantify the role of FSI effects in exclusive
$A(e,e'pN)$ reactions for four target nuclei representative for the whole mass
region. Our focus is on processes that are SRC driven. We investigate the role
of FSI for two characteristic detector setups corresponding with a "small" and
"large" coverage of the available phase space.
  Results: The transparency $T^{pN}_{A}$, defined as the ratio of exclusive
$(e,e'pN)$ cross sections on nuclei to those on "free" nucleon pairs, drops
from $ 0.2-0.3 $ for $^{12}$C to $0.04-0.07$ for $^{208}$Pb. For all considered
kinematics, the mass dependence of the $T^{pN}_{A}$ can be captured by the
power law $T^{pN}_{A} \propto A^{- \lambda}$ with $ 0.4 \lesssim \lambda
\lesssim 0.5 $. Apart from an overall reduction factor, we find that FSI only
modestly affects the distinct features of SRC-driven $A(e,e'pN)$ which are
dictated by the c.m. distribution of close-proximity pairs.
  Conclusion: The SCX mechanisms represent a relatively small (order of a few
percent) contribution of SRC-driven $A(e,e'pN)$ processes. The mass dependence
of FSI effects in exclusive $A(e,e'pN)$ can be captured in a robust power law
and is in agreement with the predictions obtained in a toy model.

28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat