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Final-state interactions in two-nucleon knockout reactions

Camille Colle UGent, Wim Cosyn UGent and Jan Ryckebusch UGent (2016) PHYSICAL REVIEW C. 93.
abstract
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 (SRCs) in nuclei. For a proper interpretation of the data, final-state interactions (FSIs) 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 of the whole mass region. Our focus is on processes that are SRC driven. We investigate the role of FSIs for two characteristic detector setups corresponding to "small" and "large" coverage of the available phase space. Method: Use is made of a factorized expression for the A(e,e' pN) cross section that is proportional to the two-body center-of-mass (c.m.) momentum distribution of close-proximity pairs. The A(e,e' pp) and A(e,e' pn) reactions for the target nuclei C-12, Al-27, Fe-56, and Pb-208 are investigated. The elastic attenuation mechanisms in the FSIs are included using the relativistic multiple-scattering Glauber approximation (RMSGA). Single-charge exchange (SCX) reactions are also included. We introduce the nuclear transparency T-A(pN), defined as the ratio of exclusive (e,e' pN) cross sections on nuclei to those on "free" nucleon pairs, as a measure for the aggregated effect of FSIs in pN knockout reactions from nucleus A. A toy model is introduced in order to gain a better understanding of the A dependence of T-A(pN). Results: The transparency TAN drops from 0.2-0.3 for C-12 to 0.04-0.07 for Pb-208. For all considered kinematics, the mass dependence of T-A(pN) can be captured by the power law T-A(pN) alpha A(-lambda) with 0.4 less than or similar to A less than or similar to 0.5. Apart from an overall reduction factor, we find that FSIs only modestly affect 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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
SHORT-RANGE CORRELATIONS, NUCLEON-NUCLEON CORRELATIONS, O-16
journal title
PHYSICAL REVIEW C
Phys. Rev. C
volume
93
article number
034608
pages
12 pages
Web of Science type
Article
Web of Science id
000371740400006
JCR category
PHYSICS, NUCLEAR
JCR impact factor
3.82 (2016)
JCR rank
5/20 (2016)
JCR quartile
1 (2016)
ISSN
2469-9985
DOI
10.1103/PhysRevC.93.034608
project
HPC-UGent: the central High Performance Computing infrastructure of Ghent University
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
7139806
handle
http://hdl.handle.net/1854/LU-7139806
date created
2016-03-09 11:49:24
date last changed
2016-12-21 15:42:50
@article{7139806,
  abstract     = {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 (SRCs) in nuclei. For a proper interpretation of the data, final-state interactions (FSIs) 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 of the whole mass region. Our focus is on processes that are SRC driven. We investigate the role of FSIs for two characteristic detector setups corresponding to {\textacutedbl}small{\textacutedbl} and {\textacutedbl}large{\textacutedbl} coverage of the available phase space. 
Method: Use is made of a factorized expression for the A(e,e' pN) cross section that is proportional to the two-body center-of-mass (c.m.) momentum distribution of close-proximity pairs. The A(e,e' pp) and A(e,e' pn) reactions for the target nuclei C-12, Al-27, Fe-56, and Pb-208 are investigated. The elastic attenuation mechanisms in the FSIs are included using the relativistic multiple-scattering Glauber approximation (RMSGA). Single-charge exchange (SCX) reactions are also included. We introduce the nuclear transparency T-A(pN), defined as the ratio of exclusive (e,e' pN) cross sections on nuclei to those on {\textacutedbl}free{\textacutedbl} nucleon pairs, as a measure for the aggregated effect of FSIs in pN knockout reactions from nucleus A. A toy model is introduced in order to gain a better understanding of the A dependence of T-A(pN). 
Results: The transparency TAN drops from 0.2-0.3 for C-12 to 0.04-0.07 for Pb-208. For all considered kinematics, the mass dependence of T-A(pN) can be captured by the power law T-A(pN) alpha A(-lambda) with 0.4 less than or similar to A less than or similar to 0.5. Apart from an overall reduction factor, we find that FSIs only modestly affect 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.},
  articleno    = {034608},
  author       = {Colle, Camille and Cosyn, Wim and Ryckebusch, Jan},
  issn         = {2469-9985},
  journal      = {PHYSICAL REVIEW C},
  keyword      = {SHORT-RANGE CORRELATIONS,NUCLEON-NUCLEON CORRELATIONS,O-16},
  language     = {eng},
  pages        = {12},
  title        = {Final-state interactions in two-nucleon knockout reactions},
  url          = {http://dx.doi.org/10.1103/PhysRevC.93.034608},
  volume       = {93},
  year         = {2016},
}

Chicago
Colle, Camille, Wim Cosyn, and Jan Ryckebusch. 2016. “Final-state Interactions in Two-nucleon Knockout Reactions.” Physical Review C 93.
APA
Colle, C., Cosyn, W., & Ryckebusch, J. (2016). Final-state interactions in two-nucleon knockout reactions. PHYSICAL REVIEW C, 93.
Vancouver
1.
Colle C, Cosyn W, Ryckebusch J. Final-state interactions in two-nucleon knockout reactions. PHYSICAL REVIEW C. 2016;93.
MLA
Colle, Camille, Wim Cosyn, and Jan Ryckebusch. “Final-state Interactions in Two-nucleon Knockout Reactions.” PHYSICAL REVIEW C 93 (2016): n. pag. Print.