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The isospin and neutron-to-proton excess dependence of short-range correlations

Jan Ryckebusch (UGent) , Wim Cosyn (UGent) , Sam Stevens (UGent) , Corneel Casert (UGent) and Jannes Nys (UGent)
(2019) PHYSICS LETTERS B. 792. p.21-28
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Abstract
We provide a systematic study of the isospin composition and neutron-to-proton (N/Z) ratio dependence of nuclear short-range correlations (SRC) across the nuclear mass table. We use the low-order correlation operator approximation (LCA) to compute the SRC contribution to the single-nucleon momentum distributions for 14 different nuclei from A=4 to A=208. Ten asymmetric nuclei are included for which the neutrons outnumber the protons by a factor of up to 1.54. The computed momentum distributions are used to extract the pair composition of the SRC. We find that there is a comprehensive picture for the isospin composition of SRC and their evolution with nucleon momentum. We also compute the non-relativistic kinetic energy of neutrons and protons and its evolution with nuclear mass A and N/Z. Confirming the conclusions from alternate studies it is shown that the minority species (protons) become increasingly more short-range correlated as the neutron-to-proton ratio increases. We forge connections between measured nucleon-knockout quantities sensitive to SRC and single-nucleon momentum distributions. It is shown that the LCA can account for the observed trends in the data, like the fact that in neutron-rich nuclei the protons are responsible for an unexpectedly large fraction of the high-momentum components.
Keywords
Nuclear and High Energy Physics

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Chicago
Ryckebusch, Jan, Wim Cosyn, Sam Stevens, Corneel Casert, and Jannes Nys. 2019. “The Isospin and Neutron-to-proton Excess Dependence of Short-range Correlations.” Physics Letters B 792: 21–28.
APA
Ryckebusch, J., Cosyn, W., Stevens, S., Casert, C., & Nys, J. (2019). The isospin and neutron-to-proton excess dependence of short-range correlations. PHYSICS LETTERS B, 792, 21–28.
Vancouver
1.
Ryckebusch J, Cosyn W, Stevens S, Casert C, Nys J. The isospin and neutron-to-proton excess dependence of short-range correlations. PHYSICS LETTERS B. 2019;792:21–8.
MLA
Ryckebusch, Jan et al. “The Isospin and Neutron-to-proton Excess Dependence of Short-range Correlations.” PHYSICS LETTERS B 792 (2019): 21–28. Print.
@article{8608520,
  abstract     = {We provide a systematic study of the isospin composition and neutron-to-proton (N/Z) ratio dependence of nuclear short-range correlations (SRC) across the nuclear mass table. We use the low-order correlation operator approximation (LCA) to compute the SRC contribution to the single-nucleon momentum distributions for 14 different nuclei from A=4 to A=208. Ten asymmetric nuclei are included for which the neutrons outnumber the protons by a factor of up to 1.54. The computed momentum distributions are used to extract the pair composition of the SRC. We find that there is a comprehensive picture for the isospin composition of SRC and their evolution with nucleon momentum. We also compute the non-relativistic kinetic energy of neutrons and protons and its evolution with nuclear mass A and N/Z. Confirming the conclusions from alternate studies it is shown that the minority species (protons) become increasingly more short-range correlated as the neutron-to-proton ratio increases. We forge connections between measured nucleon-knockout quantities sensitive to SRC and single-nucleon momentum distributions. It is shown that the LCA can account for the observed trends in the data, like the fact that in neutron-rich nuclei the protons are responsible for an unexpectedly large fraction of the high-momentum components. },
  author       = {Ryckebusch, Jan and Cosyn, Wim and Stevens, Sam and Casert, Corneel and Nys, Jannes},
  issn         = {0370-2693},
  journal      = {PHYSICS LETTERS B},
  language     = {eng},
  pages        = {21--28},
  title        = {The isospin and neutron-to-proton excess dependence of short-range correlations},
  url          = {http://dx.doi.org/10.1016/j.physletb.2019.03.016},
  volume       = {792},
  year         = {2019},
}

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